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build: move e2e dependencies into e2e/go.mod

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Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>
This commit is contained in:
Niels de Vos
2025-03-04 08:57:28 +01:00
committed by mergify[bot]
parent 15da101b1b
commit bec6090996
8047 changed files with 1407827 additions and 3453 deletions
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# Binaries for programs and plugins
*.exe
*.dll
*.so
*.dylib
# Test binary, build with `go test -c`
*.test
# Output of the go coverage tool, specifically when used with LiteIDE
*.out
# Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736
.glide/
examples/remove-empty-directories/remove-empty-directories
examples/sizes/sizes
examples/walk-fast/walk-fast
examples/walk-stdlib/walk-stdlib

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BSD 2-Clause License
Copyright (c) 2017, Karrick McDermott
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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# godirwalk
`godirwalk` is a library for traversing a directory tree on a file
system.
[![GoDoc](https://godoc.org/github.com/karrick/godirwalk?status.svg)](https://godoc.org/github.com/karrick/godirwalk) [![Build Status](https://dev.azure.com/microsoft0235/microsoft/_apis/build/status/karrick.godirwalk?branchName=master)](https://dev.azure.com/microsoft0235/microsoft/_build/latest?definitionId=1&branchName=master)
In short, why did I create this library?
1. It's faster than `filepath.Walk`.
1. It's more correct on Windows than `filepath.Walk`.
1. It's more easy to use than `filepath.Walk`.
1. It's more flexible than `filepath.Walk`.
Depending on your specific circumstances, [you might no longer need a
library for file walking in
Go](https://engineering.kablamo.com.au/posts/2021/quick-comparison-between-go-file-walk-implementations).
## Usage Example
Additional examples are provided in the `examples/` subdirectory.
This library will normalize the provided top level directory name
based on the os-specific path separator by calling `filepath.Clean` on
its first argument. However it always provides the pathname created by
using the correct os-specific path separator when invoking the
provided callback function.
```Go
dirname := "some/directory/root"
err := godirwalk.Walk(dirname, &godirwalk.Options{
Callback: func(osPathname string, de *godirwalk.Dirent) error {
// Following string operation is not most performant way
// of doing this, but common enough to warrant a simple
// example here:
if strings.Contains(osPathname, ".git") {
return godirwalk.SkipThis
}
fmt.Printf("%s %s\n", de.ModeType(), osPathname)
return nil
},
Unsorted: true, // (optional) set true for faster yet non-deterministic enumeration (see godoc)
})
```
This library not only provides functions for traversing a file system
directory tree, but also for obtaining a list of immediate descendants
of a particular directory, typically much more quickly than using
`os.ReadDir` or `os.ReadDirnames`.
## Description
Here's why I use `godirwalk` in preference to `filepath.Walk`,
`os.ReadDir`, and `os.ReadDirnames`.
### It's faster than `filepath.Walk`
When compared against `filepath.Walk` in benchmarks, it has been
observed to run between five and ten times the speed on darwin, at
speeds comparable to the that of the unix `find` utility; and about
twice the speed on linux; and about four times the speed on Windows.
How does it obtain this performance boost? It does less work to give
you nearly the same output. This library calls the same `syscall`
functions to do the work, but it makes fewer calls, does not throw
away information that it might need, and creates less memory churn
along the way by reusing the same scratch buffer for reading from a
directory rather than reallocating a new buffer every time it reads
file system entry data from the operating system.
While traversing a file system directory tree, `filepath.Walk` obtains
the list of immediate descendants of a directory, and throws away the
node type information for the file system entry that is provided by
the operating system that comes with the node's name. Then,
immediately prior to invoking the callback function, `filepath.Walk`
invokes `os.Stat` for each node, and passes the returned `os.FileInfo`
information to the callback.
While the `os.FileInfo` information provided by `os.Stat` is extremely
helpful--and even includes the `os.FileMode` data--providing it
requires an additional system call for each node.
Because most callbacks only care about what the node type is, this
library does not throw the type information away, but rather provides
that information to the callback function in the form of a
`os.FileMode` value. Note that the provided `os.FileMode` value that
this library provides only has the node type information, and does not
have the permission bits, sticky bits, or other information from the
file's mode. If the callback does care about a particular node's
entire `os.FileInfo` data structure, the callback can easiy invoke
`os.Stat` when needed, and only when needed.
#### Benchmarks
##### macOS
```Bash
$ go test -bench=. -benchmem
goos: darwin
goarch: amd64
pkg: github.com/karrick/godirwalk
BenchmarkReadDirnamesStandardLibrary-12 50000 26250 ns/op 10360 B/op 16 allocs/op
BenchmarkReadDirnamesThisLibrary-12 50000 24372 ns/op 5064 B/op 20 allocs/op
BenchmarkFilepathWalk-12 1 1099524875 ns/op 228415912 B/op 416952 allocs/op
BenchmarkGodirwalk-12 2 526754589 ns/op 103110464 B/op 451442 allocs/op
BenchmarkGodirwalkUnsorted-12 3 509219296 ns/op 100751400 B/op 378800 allocs/op
BenchmarkFlameGraphFilepathWalk-12 1 7478618820 ns/op 2284138176 B/op 4169453 allocs/op
BenchmarkFlameGraphGodirwalk-12 1 4977264058 ns/op 1031105328 B/op 4514423 allocs/op
PASS
ok github.com/karrick/godirwalk 21.219s
```
##### Linux
```Bash
$ go test -bench=. -benchmem
goos: linux
goarch: amd64
pkg: github.com/karrick/godirwalk
BenchmarkReadDirnamesStandardLibrary-12 100000 15458 ns/op 10360 B/op 16 allocs/op
BenchmarkReadDirnamesThisLibrary-12 100000 14646 ns/op 5064 B/op 20 allocs/op
BenchmarkFilepathWalk-12 2 631034745 ns/op 228210216 B/op 416939 allocs/op
BenchmarkGodirwalk-12 3 358714883 ns/op 102988664 B/op 451437 allocs/op
BenchmarkGodirwalkUnsorted-12 3 355363915 ns/op 100629234 B/op 378796 allocs/op
BenchmarkFlameGraphFilepathWalk-12 1 6086913991 ns/op 2282104720 B/op 4169417 allocs/op
BenchmarkFlameGraphGodirwalk-12 1 3456398824 ns/op 1029886400 B/op 4514373 allocs/op
PASS
ok github.com/karrick/godirwalk 19.179s
```
### It's more correct on Windows than `filepath.Walk`
I did not previously care about this either, but humor me. We all love
how we can write once and run everywhere. It is essential for the
language's adoption, growth, and success, that the software we create
can run unmodified on all architectures and operating systems
supported by Go.
When the traversed file system has a logical loop caused by symbolic
links to directories, on unix `filepath.Walk` ignores symbolic links
and traverses the entire directory tree without error. On Windows
however, `filepath.Walk` will continue following directory symbolic
links, even though it is not supposed to, eventually causing
`filepath.Walk` to terminate early and return an error when the
pathname gets too long from concatenating endless loops of symbolic
links onto the pathname. This error comes from Windows, passes through
`filepath.Walk`, and to the upstream client running `filepath.Walk`.
The takeaway is that behavior is different based on which platform
`filepath.Walk` is running. While this is clearly not intentional,
until it is fixed in the standard library, it presents a compatibility
problem.
This library fixes the above problem such that it will never follow
logical file sytem loops on either unix or Windows. Furthermore, it
will only follow symbolic links when `FollowSymbolicLinks` is set to
true. Behavior on Windows and other operating systems is identical.
### It's more easy to use than `filepath.Walk`
While this library strives to mimic the behavior of the incredibly
well-written `filepath.Walk` standard library, there are places where
it deviates a bit in order to provide a more easy or intuitive caller
interface.
#### Callback interface does not send you an error to check
Since this library does not invoke `os.Stat` on every file system node
it encounters, there is no possible error event for the callback
function to filter on. The third argument in the `filepath.WalkFunc`
function signature to pass the error from `os.Stat` to the callback
function is no longer necessary, and thus eliminated from signature of
the callback function from this library.
Furthermore, this slight interface difference between
`filepath.WalkFunc` and this library's `WalkFunc` eliminates the
boilerplate code that callback handlers must write when they use
`filepath.Walk`. Rather than every callback function needing to check
the error value passed into it and branch accordingly, users of this
library do not even have an error value to check immediately upon
entry into the callback function. This is an improvement both in
runtime performance and code clarity.
#### Callback function is invoked with OS specific file system path separator
On every OS platform `filepath.Walk` invokes the callback function
with a solidus (`/`) delimited pathname. By contrast this library
invokes the callback with the os-specific pathname separator,
obviating a call to `filepath.Clean` in the callback function for each
node prior to actually using the provided pathname.
In other words, even on Windows, `filepath.Walk` will invoke the
callback with `some/path/to/foo.txt`, requiring well written clients
to perform pathname normalization for every file prior to working with
the specified file. This is a hidden boilerplate requirement to create
truly os agnostic callback functions. In truth, many clients developed
on unix and not tested on Windows neglect this subtlety, and will
result in software bugs when someone tries to run that software on
Windows.
This library invokes the callback function with `some\path\to\foo.txt`
for the same file when running on Windows, eliminating the need to
normalize the pathname by the client, and lessen the likelyhood that a
client will work on unix but not on Windows.
This enhancement eliminates necessity for some more boilerplate code
in callback functions while improving the runtime performance of this
library.
#### `godirwalk.SkipThis` is more intuitive to use than `filepath.SkipDir`
One arguably confusing aspect of the `filepath.WalkFunc` interface
that this library must emulate is how a caller tells the `Walk`
function to skip file system entries. With both `filepath.Walk` and
this library's `Walk`, when a callback function wants to skip a
directory and not descend into its children, it returns
`filepath.SkipDir`. If the callback function returns
`filepath.SkipDir` for a non-directory, `filepath.Walk` and this
library will stop processing any more entries in the current
directory. This is not necessarily what most developers want or
expect. If you want to simply skip a particular non-directory entry
but continue processing entries in the directory, the callback
function must return nil.
The implications of this interface design is when you want to walk a
file system hierarchy and skip an entry, you have to return a
different value based on what type of file system entry that node
is. To skip an entry, if the entry is a directory, you must return
`filepath.SkipDir`, and if entry is not a directory, you must return
`nil`. This is an unfortunate hurdle I have observed many developers
struggling with, simply because it is not an intuitive interface.
Here is an example callback function that adheres to
`filepath.WalkFunc` interface to have it skip any file system entry
whose full pathname includes a particular substring, `optSkip`. Note
that this library still supports identical behavior of `filepath.Walk`
when the callback function returns `filepath.SkipDir`.
```Go
func callback1(osPathname string, de *godirwalk.Dirent) error {
if optSkip != "" && strings.Contains(osPathname, optSkip) {
if b, err := de.IsDirOrSymlinkToDir(); b == true && err == nil {
return filepath.SkipDir
}
return nil
}
// Process file like normal...
return nil
}
```
This library attempts to eliminate some of that logic boilerplate
required in callback functions by providing a new token error value,
`SkipThis`, which a callback function may return to skip the current
file system entry regardless of what type of entry it is. If the
current entry is a directory, its children will not be enumerated,
exactly as if the callback had returned `filepath.SkipDir`. If the
current entry is a non-directory, the next file system entry in the
current directory will be enumerated, exactly as if the callback
returned `nil`. The following example callback function has identical
behavior as the previous, but has less boilerplate, and admittedly
logic that I find more simple to follow.
```Go
func callback2(osPathname string, de *godirwalk.Dirent) error {
if optSkip != "" && strings.Contains(osPathname, optSkip) {
return godirwalk.SkipThis
}
// Process file like normal...
return nil
}
```
### It's more flexible than `filepath.Walk`
#### Configurable Handling of Symbolic Links
The default behavior of this library is to ignore symbolic links to
directories when walking a directory tree, just like `filepath.Walk`
does. However, it does invoke the callback function with each node it
finds, including symbolic links. If a particular use case exists to
follow symbolic links when traversing a directory tree, this library
can be invoked in manner to do so, by setting the
`FollowSymbolicLinks` config parameter to `true`.
#### Configurable Sorting of Directory Children
The default behavior of this library is to always sort the immediate
descendants of a directory prior to visiting each node, just like
`filepath.Walk` does. This is usually the desired behavior. However,
this does come at slight performance and memory penalties required to
sort the names when a directory node has many entries. Additionally if
caller specifies `Unsorted` enumeration in the configuration
parameter, reading directories is lazily performed as the caller
consumes entries. If a particular use case exists that does not
require sorting the directory's immediate descendants prior to
visiting its nodes, this library will skip the sorting step when the
`Unsorted` parameter is set to `true`.
Here's an interesting read of the potential hazzards of traversing a
file system hierarchy in a non-deterministic order. If you know the
problem you are solving is not affected by the order files are
visited, then I encourage you to use `Unsorted`. Otherwise skip
setting this option.
[Researchers find bug in Python script may have affected hundreds of studies](https://arstechnica.com/information-technology/2019/10/chemists-discover-cross-platform-python-scripts-not-so-cross-platform/)
#### Configurable Post Children Callback
This library provides upstream code with the ability to specify a
callback function to be invoked for each directory after its children
are processed. This has been used to recursively delete empty
directories after traversing the file system in a more efficient
manner. See the `examples/clean-empties` directory for an example of
this usage.
#### Configurable Error Callback
This library provides upstream code with the ability to specify a
callback to be invoked for errors that the operating system returns,
allowing the upstream code to determine the next course of action to
take, whether to halt walking the hierarchy, as it would do were no
error callback provided, or skip the node that caused the error. See
the `examples/walk-fast` directory for an example of this usage.

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# Go
# Build your Go project.
# Add steps that test, save build artifacts, deploy, and more:
# https://docs.microsoft.com/azure/devops/pipelines/languages/go
trigger:
- master
variables:
GOVERSION: 1.13
jobs:
- job: Linux
pool:
vmImage: 'ubuntu-latest'
steps:
- task: GoTool@0
displayName: 'Use Go $(GOVERSION)'
inputs:
version: $(GOVERSION)
- task: Go@0
inputs:
command: test
arguments: -race -v ./...
displayName: 'Execute Tests'
- job: Mac
pool:
vmImage: 'macos-latest'
steps:
- task: GoTool@0
displayName: 'Use Go $(GOVERSION)'
inputs:
version: $(GOVERSION)
- task: Go@0
inputs:
command: test
arguments: -race -v ./...
displayName: 'Execute Tests'
- job: Windows
pool:
vmImage: 'windows-latest'
steps:
- task: GoTool@0
displayName: 'Use Go $(GOVERSION)'
inputs:
version: $(GOVERSION)
- task: Go@0
inputs:
command: test
arguments: -race -v ./...
displayName: 'Execute Tests'

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#!/bin/bash
# for version in v1.9.1 v1.10.0 v1.10.3 v1.10.12 v1.11.2 v1.11.3 v1.12.0 v1.13.1 v1.14.0 v1.14.1 ; do
for version in v1.10.12 v1.14.1 v1.15.2 ; do
echo "### $version" > $version.txt
git checkout -- go.mod && git checkout $version && go test -run=NONE -bench=Benchmark2 >> $version.txt || exit 1
done

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// +build godirwalk_debug
package godirwalk
import (
"fmt"
"os"
)
// debug formats and prints arguments to stderr for development builds
func debug(f string, a ...interface{}) {
// fmt.Fprintf(os.Stderr, f, a...)
os.Stderr.Write([]byte("godirwalk: " + fmt.Sprintf(f, a...)))
}

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// +build !godirwalk_debug
package godirwalk
// debug is a no-op for release builds
func debug(_ string, _ ...interface{}) {}

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package godirwalk
import (
"os"
"path/filepath"
)
// Dirent stores the name and file system mode type of discovered file system
// entries.
type Dirent struct {
name string // base name of the file system entry.
path string // path name of the file system entry.
modeType os.FileMode // modeType is the type of file system entry.
}
// NewDirent returns a newly initialized Dirent structure, or an error. This
// function does not follow symbolic links.
//
// This function is rarely used, as Dirent structures are provided by other
// functions in this library that read and walk directories, but is provided,
// however, for the occasion when a program needs to create a Dirent.
func NewDirent(osPathname string) (*Dirent, error) {
modeType, err := modeType(osPathname)
if err != nil {
return nil, err
}
return &Dirent{
name: filepath.Base(osPathname),
path: filepath.Dir(osPathname),
modeType: modeType,
}, nil
}
// IsDir returns true if and only if the Dirent represents a file system
// directory. Note that on some operating systems, more than one file mode bit
// may be set for a node. For instance, on Windows, a symbolic link that points
// to a directory will have both the directory and the symbolic link bits set.
func (de Dirent) IsDir() bool { return de.modeType&os.ModeDir != 0 }
// IsDirOrSymlinkToDir returns true if and only if the Dirent represents a file
// system directory, or a symbolic link to a directory. Note that if the Dirent
// is not a directory but is a symbolic link, this method will resolve by
// sending a request to the operating system to follow the symbolic link.
func (de Dirent) IsDirOrSymlinkToDir() (bool, error) {
if de.IsDir() {
return true, nil
}
if !de.IsSymlink() {
return false, nil
}
// Does this symlink point to a directory?
info, err := os.Stat(filepath.Join(de.path, de.name))
if err != nil {
return false, err
}
return info.IsDir(), nil
}
// IsRegular returns true if and only if the Dirent represents a regular file.
// That is, it ensures that no mode type bits are set.
func (de Dirent) IsRegular() bool { return de.modeType&os.ModeType == 0 }
// IsSymlink returns true if and only if the Dirent represents a file system
// symbolic link. Note that on some operating systems, more than one file mode
// bit may be set for a node. For instance, on Windows, a symbolic link that
// points to a directory will have both the directory and the symbolic link bits
// set.
func (de Dirent) IsSymlink() bool { return de.modeType&os.ModeSymlink != 0 }
// IsDevice returns true if and only if the Dirent represents a device file.
func (de Dirent) IsDevice() bool { return de.modeType&os.ModeDevice != 0 }
// ModeType returns the mode bits that specify the file system node type. We
// could make our own enum-like data type for encoding the file type, but Go's
// runtime already gives us architecture independent file modes, as discussed in
// `os/types.go`:
//
// Go's runtime FileMode type has same definition on all systems, so that
// information about files can be moved from one system to another portably.
func (de Dirent) ModeType() os.FileMode { return de.modeType }
// Name returns the base name of the file system entry.
func (de Dirent) Name() string { return de.name }
// reset releases memory held by entry err and name, and resets mode type to 0.
func (de *Dirent) reset() {
de.name = ""
de.path = ""
de.modeType = 0
}
// Dirents represents a slice of Dirent pointers, which are sortable by base
// name. This type satisfies the `sort.Interface` interface.
type Dirents []*Dirent
// Len returns the count of Dirent structures in the slice.
func (l Dirents) Len() int { return len(l) }
// Less returns true if and only if the base name of the element specified by
// the first index is lexicographically less than that of the second index.
func (l Dirents) Less(i, j int) bool { return l[i].name < l[j].name }
// Swap exchanges the two Dirent entries specified by the two provided indexes.
func (l Dirents) Swap(i, j int) { l[i], l[j] = l[j], l[i] }

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/*
Package godirwalk provides functions to read and traverse directory trees.
In short, why do I use this library?
* It's faster than `filepath.Walk`.
* It's more correct on Windows than `filepath.Walk`.
* It's more easy to use than `filepath.Walk`.
* It's more flexible than `filepath.Walk`.
USAGE
This library will normalize the provided top level directory name based on the
os-specific path separator by calling `filepath.Clean` on its first
argument. However it always provides the pathname created by using the correct
os-specific path separator when invoking the provided callback function.
dirname := "some/directory/root"
err := godirwalk.Walk(dirname, &godirwalk.Options{
Callback: func(osPathname string, de *godirwalk.Dirent) error {
fmt.Printf("%s %s\n", de.ModeType(), osPathname)
return nil
},
})
This library not only provides functions for traversing a file system directory
tree, but also for obtaining a list of immediate descendants of a particular
directory, typically much more quickly than using `os.ReadDir` or
`os.ReadDirnames`.
scratchBuffer := make([]byte, godirwalk.MinimumScratchBufferSize)
names, err := godirwalk.ReadDirnames("some/directory", scratchBuffer)
// ...
entries, err := godirwalk.ReadDirents("another/directory", scratchBuffer)
// ...
*/
package godirwalk

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// +build dragonfly freebsd openbsd netbsd
package godirwalk
import "syscall"
func inoFromDirent(de *syscall.Dirent) uint64 {
return uint64(de.Fileno)
}

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// +build aix darwin linux nacl solaris
package godirwalk
import "syscall"
func inoFromDirent(de *syscall.Dirent) uint64 {
return uint64(de.Ino)
}

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package godirwalk
import (
"os"
)
// modeType returns the mode type of the file system entry identified by
// osPathname by calling os.LStat function, to intentionally not follow symbolic
// links.
//
// Even though os.LStat provides all file mode bits, we want to ensure same
// values returned to caller regardless of whether we obtained file mode bits
// from syscall or stat call. Therefore mask out the additional file mode bits
// that are provided by stat but not by the syscall, so users can rely on their
// values.
func modeType(osPathname string) (os.FileMode, error) {
fi, err := os.Lstat(osPathname)
if err == nil {
return fi.Mode() & os.ModeType, nil
}
return 0, err
}

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// +build darwin dragonfly freebsd linux netbsd openbsd
package godirwalk
import (
"os"
"path/filepath"
"syscall"
)
// modeTypeFromDirent converts a syscall defined constant, which is in purview
// of OS, to a constant defined by Go, assumed by this project to be stable.
//
// When the syscall constant is not recognized, this function falls back to a
// Stat on the file system.
func modeTypeFromDirent(de *syscall.Dirent, osDirname, osBasename string) (os.FileMode, error) {
switch de.Type {
case syscall.DT_REG:
return 0, nil
case syscall.DT_DIR:
return os.ModeDir, nil
case syscall.DT_LNK:
return os.ModeSymlink, nil
case syscall.DT_CHR:
return os.ModeDevice | os.ModeCharDevice, nil
case syscall.DT_BLK:
return os.ModeDevice, nil
case syscall.DT_FIFO:
return os.ModeNamedPipe, nil
case syscall.DT_SOCK:
return os.ModeSocket, nil
default:
// If syscall returned unknown type (e.g., DT_UNKNOWN, DT_WHT), then
// resolve actual mode by reading file information.
return modeType(filepath.Join(osDirname, osBasename))
}
}

18
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// +build aix js nacl solaris
package godirwalk
import (
"os"
"path/filepath"
"syscall"
)
// modeTypeFromDirent converts a syscall defined constant, which is in purview
// of OS, to a constant defined by Go, assumed by this project to be stable.
//
// Because some operating system syscall.Dirent structures do not include a Type
// field, fall back on Stat of the file system.
func modeTypeFromDirent(_ *syscall.Dirent, osDirname, osBasename string) (os.FileMode, error) {
return modeType(filepath.Join(osDirname, osBasename))
}

29
e2e/vendor/github.com/karrick/godirwalk/nameWithNamlen.go generated vendored Normal file
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// +build aix darwin dragonfly freebsd netbsd openbsd
package godirwalk
import (
"reflect"
"syscall"
"unsafe"
)
func nameFromDirent(de *syscall.Dirent) []byte {
// Because this GOOS' syscall.Dirent provides a Namlen field that says how
// long the name is, this function does not need to search for the NULL
// byte.
ml := int(de.Namlen)
// Convert syscall.Dirent.Name, which is array of int8, to []byte, by
// overwriting Cap, Len, and Data slice header fields to values from
// syscall.Dirent fields. Setting the Cap, Len, and Data field values for
// the slice header modifies what the slice header points to, and in this
// case, the name buffer.
var name []byte
sh := (*reflect.SliceHeader)(unsafe.Pointer(&name))
sh.Cap = ml
sh.Len = ml
sh.Data = uintptr(unsafe.Pointer(&de.Name[0]))
return name
}

42
e2e/vendor/github.com/karrick/godirwalk/nameWithoutNamlen.go generated vendored Normal file
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// +build nacl linux js solaris
package godirwalk
import (
"bytes"
"reflect"
"syscall"
"unsafe"
)
// nameOffset is a compile time constant
const nameOffset = int(unsafe.Offsetof(syscall.Dirent{}.Name))
func nameFromDirent(de *syscall.Dirent) (name []byte) {
// Because this GOOS' syscall.Dirent does not provide a field that specifies
// the name length, this function must first calculate the max possible name
// length, and then search for the NULL byte.
ml := int(de.Reclen) - nameOffset
// Convert syscall.Dirent.Name, which is array of int8, to []byte, by
// overwriting Cap, Len, and Data slice header fields to the max possible
// name length computed above, and finding the terminating NULL byte.
sh := (*reflect.SliceHeader)(unsafe.Pointer(&name))
sh.Cap = ml
sh.Len = ml
sh.Data = uintptr(unsafe.Pointer(&de.Name[0]))
if index := bytes.IndexByte(name, 0); index >= 0 {
// Found NULL byte; set slice's cap and len accordingly.
sh.Cap = index
sh.Len = index
return
}
// NOTE: This branch is not expected, but included for defensive
// programming, and provides a hard stop on the name based on the structure
// field array size.
sh.Cap = len(de.Name)
sh.Len = sh.Cap
return
}

53
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package godirwalk
// ReadDirents returns a sortable slice of pointers to Dirent structures, each
// representing the file system name and mode type for one of the immediate
// descendant of the specified directory. If the specified directory is a
// symbolic link, it will be resolved.
//
// If an optional scratch buffer is provided that is at least one page of
// memory, it will be used when reading directory entries from the file
// system. If you plan on calling this function in a loop, you will have
// significantly better performance if you allocate a scratch buffer and use it
// each time you call this function.
//
// children, err := godirwalk.ReadDirents(osDirname, nil)
// if err != nil {
// return nil, errors.Wrap(err, "cannot get list of directory children")
// }
// sort.Sort(children)
// for _, child := range children {
// fmt.Printf("%s %s\n", child.ModeType, child.Name)
// }
func ReadDirents(osDirname string, scratchBuffer []byte) (Dirents, error) {
return readDirents(osDirname, scratchBuffer)
}
// ReadDirnames returns a slice of strings, representing the immediate
// descendants of the specified directory. If the specified directory is a
// symbolic link, it will be resolved.
//
// If an optional scratch buffer is provided that is at least one page of
// memory, it will be used when reading directory entries from the file
// system. If you plan on calling this function in a loop, you will have
// significantly better performance if you allocate a scratch buffer and use it
// each time you call this function.
//
// Note that this function, depending on operating system, may or may not invoke
// the ReadDirents function, in order to prepare the list of immediate
// descendants. Therefore, if your program needs both the names and the file
// system mode types of descendants, it will always be faster to invoke
// ReadDirents directly, rather than calling this function, then looping over
// the results and calling os.Stat or os.LStat for each entry.
//
// children, err := godirwalk.ReadDirnames(osDirname, nil)
// if err != nil {
// return nil, errors.Wrap(err, "cannot get list of directory children")
// }
// sort.Strings(children)
// for _, child := range children {
// fmt.Printf("%s\n", child)
// }
func ReadDirnames(osDirname string, scratchBuffer []byte) ([]string, error) {
return readDirnames(osDirname, scratchBuffer)
}

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// +build !windows
package godirwalk
import (
"os"
"syscall"
"unsafe"
)
// MinimumScratchBufferSize specifies the minimum size of the scratch buffer
// that ReadDirents, ReadDirnames, Scanner, and Walk will use when reading file
// entries from the operating system. During program startup it is initialized
// to the result from calling `os.Getpagesize()` for non Windows environments,
// and 0 for Windows.
var MinimumScratchBufferSize = os.Getpagesize()
func newScratchBuffer() []byte { return make([]byte, MinimumScratchBufferSize) }
func readDirents(osDirname string, scratchBuffer []byte) ([]*Dirent, error) {
var entries []*Dirent
var workBuffer []byte
dh, err := os.Open(osDirname)
if err != nil {
return nil, err
}
fd := int(dh.Fd())
if len(scratchBuffer) < MinimumScratchBufferSize {
scratchBuffer = newScratchBuffer()
}
var sde syscall.Dirent
for {
if len(workBuffer) == 0 {
n, err := syscall.ReadDirent(fd, scratchBuffer)
// n, err := unix.ReadDirent(fd, scratchBuffer)
if err != nil {
if err == syscall.EINTR /* || err == unix.EINTR */ {
continue
}
_ = dh.Close()
return nil, err
}
if n <= 0 { // end of directory: normal exit
if err = dh.Close(); err != nil {
return nil, err
}
return entries, nil
}
workBuffer = scratchBuffer[:n] // trim work buffer to number of bytes read
}
copy((*[unsafe.Sizeof(syscall.Dirent{})]byte)(unsafe.Pointer(&sde))[:], workBuffer)
workBuffer = workBuffer[reclen(&sde):] // advance buffer for next iteration through loop
if inoFromDirent(&sde) == 0 {
continue // inode set to 0 indicates an entry that was marked as deleted
}
nameSlice := nameFromDirent(&sde)
nameLength := len(nameSlice)
if nameLength == 0 || (nameSlice[0] == '.' && (nameLength == 1 || (nameLength == 2 && nameSlice[1] == '.'))) {
continue
}
childName := string(nameSlice)
mt, err := modeTypeFromDirent(&sde, osDirname, childName)
if err != nil {
_ = dh.Close()
return nil, err
}
entries = append(entries, &Dirent{name: childName, path: osDirname, modeType: mt})
}
}
func readDirnames(osDirname string, scratchBuffer []byte) ([]string, error) {
var entries []string
var workBuffer []byte
var sde *syscall.Dirent
dh, err := os.Open(osDirname)
if err != nil {
return nil, err
}
fd := int(dh.Fd())
if len(scratchBuffer) < MinimumScratchBufferSize {
scratchBuffer = newScratchBuffer()
}
for {
if len(workBuffer) == 0 {
n, err := syscall.ReadDirent(fd, scratchBuffer)
// n, err := unix.ReadDirent(fd, scratchBuffer)
if err != nil {
if err == syscall.EINTR /* || err == unix.EINTR */ {
continue
}
_ = dh.Close()
return nil, err
}
if n <= 0 { // end of directory: normal exit
if err = dh.Close(); err != nil {
return nil, err
}
return entries, nil
}
workBuffer = scratchBuffer[:n] // trim work buffer to number of bytes read
}
sde = (*syscall.Dirent)(unsafe.Pointer(&workBuffer[0])) // point entry to first syscall.Dirent in buffer
// Handle first entry in the work buffer.
workBuffer = workBuffer[reclen(sde):] // advance buffer for next iteration through loop
if inoFromDirent(sde) == 0 {
continue // inode set to 0 indicates an entry that was marked as deleted
}
nameSlice := nameFromDirent(sde)
nameLength := len(nameSlice)
if nameLength == 0 || (nameSlice[0] == '.' && (nameLength == 1 || (nameLength == 2 && nameSlice[1] == '.'))) {
continue
}
entries = append(entries, string(nameSlice))
}
}

66
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// +build windows
package godirwalk
import "os"
// MinimumScratchBufferSize specifies the minimum size of the scratch buffer
// that ReadDirents, ReadDirnames, Scanner, and Walk will use when reading file
// entries from the operating system. During program startup it is initialized
// to the result from calling `os.Getpagesize()` for non Windows environments,
// and 0 for Windows.
var MinimumScratchBufferSize = 0
func newScratchBuffer() []byte { return nil }
func readDirents(osDirname string, _ []byte) ([]*Dirent, error) {
dh, err := os.Open(osDirname)
if err != nil {
return nil, err
}
fileinfos, err := dh.Readdir(-1)
if err != nil {
_ = dh.Close()
return nil, err
}
entries := make([]*Dirent, len(fileinfos))
for i, fi := range fileinfos {
entries[i] = &Dirent{
name: fi.Name(),
path: osDirname,
modeType: fi.Mode() & os.ModeType,
}
}
if err = dh.Close(); err != nil {
return nil, err
}
return entries, nil
}
func readDirnames(osDirname string, _ []byte) ([]string, error) {
dh, err := os.Open(osDirname)
if err != nil {
return nil, err
}
fileinfos, err := dh.Readdir(-1)
if err != nil {
_ = dh.Close()
return nil, err
}
entries := make([]string, len(fileinfos))
for i, fi := range fileinfos {
entries[i] = fi.Name()
}
if err = dh.Close(); err != nil {
return nil, err
}
return entries, nil
}

9
e2e/vendor/github.com/karrick/godirwalk/reclenFromNamlen.go generated vendored Normal file
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@ -0,0 +1,9 @@
// +build dragonfly
package godirwalk
import "syscall"
func reclen(de *syscall.Dirent) uint64 {
return (16 + uint64(de.Namlen) + 1 + 7) &^ 7
}

9
e2e/vendor/github.com/karrick/godirwalk/reclenFromReclen.go generated vendored Normal file
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@ -0,0 +1,9 @@
// +build nacl linux js solaris aix darwin freebsd netbsd openbsd
package godirwalk
import "syscall"
func reclen(de *syscall.Dirent) uint64 {
return uint64(de.Reclen)
}

181
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//go:build !windows
// +build !windows
package godirwalk
import (
"os"
"syscall"
"unsafe"
)
// Scanner is an iterator to enumerate the contents of a directory.
type Scanner struct {
scratchBuffer []byte // read directory bytes from file system into this buffer
workBuffer []byte // points into scratchBuffer, from which we chunk out directory entries
osDirname string
childName string
err error // err is the error associated with scanning directory
statErr error // statErr is any error return while attempting to stat an entry
dh *os.File // used to close directory after done reading
de *Dirent // most recently decoded directory entry
sde syscall.Dirent
fd int // file descriptor used to read entries from directory
}
// NewScanner returns a new directory Scanner that lazily enumerates
// the contents of a single directory. To prevent resource leaks,
// caller must invoke either the Scanner's Close or Err method after
// it has completed scanning a directory.
//
// scanner, err := godirwalk.NewScanner(dirname)
// if err != nil {
// fatal("cannot scan directory: %s", err)
// }
//
// for scanner.Scan() {
// dirent, err := scanner.Dirent()
// if err != nil {
// warning("cannot get dirent: %s", err)
// continue
// }
// name := dirent.Name()
// if name == "break" {
// break
// }
// if name == "continue" {
// continue
// }
// fmt.Printf("%v %v\n", dirent.ModeType(), dirent.Name())
// }
// if err := scanner.Err(); err != nil {
// fatal("cannot scan directory: %s", err)
// }
func NewScanner(osDirname string) (*Scanner, error) {
return NewScannerWithScratchBuffer(osDirname, nil)
}
// NewScannerWithScratchBuffer returns a new directory Scanner that
// lazily enumerates the contents of a single directory. On platforms
// other than Windows it uses the provided scratch buffer to read from
// the file system. On Windows the scratch buffer is ignored. To
// prevent resource leaks, caller must invoke either the Scanner's
// Close or Err method after it has completed scanning a directory.
func NewScannerWithScratchBuffer(osDirname string, scratchBuffer []byte) (*Scanner, error) {
dh, err := os.Open(osDirname)
if err != nil {
return nil, err
}
if len(scratchBuffer) < MinimumScratchBufferSize {
scratchBuffer = newScratchBuffer()
}
scanner := &Scanner{
scratchBuffer: scratchBuffer,
osDirname: osDirname,
dh: dh,
fd: int(dh.Fd()),
}
return scanner, nil
}
// Close releases resources associated with scanning a directory. Call
// either this or the Err method when the directory no longer needs to
// be scanned.
func (s *Scanner) Close() error {
return s.Err()
}
// Dirent returns the current directory entry while scanning a directory.
func (s *Scanner) Dirent() (*Dirent, error) {
if s.de == nil {
s.de = &Dirent{name: s.childName, path: s.osDirname}
s.de.modeType, s.statErr = modeTypeFromDirent(&s.sde, s.osDirname, s.childName)
}
return s.de, s.statErr
}
// done is called when directory scanner unable to continue, with either the
// triggering error, or nil when there are simply no more entries to read from
// the directory.
func (s *Scanner) done(err error) {
if s.dh == nil {
return
}
s.err = err
if err = s.dh.Close(); s.err == nil {
s.err = err
}
s.osDirname, s.childName = "", ""
s.scratchBuffer, s.workBuffer = nil, nil
s.dh, s.de, s.statErr = nil, nil, nil
s.sde = syscall.Dirent{}
s.fd = 0
}
// Err returns any error associated with scanning a directory. It is
// normal to call Err after Scan returns false, even though they both
// ensure Scanner resources are released. Call either this or the
// Close method when the directory no longer needs to be scanned.
func (s *Scanner) Err() error {
s.done(nil)
return s.err
}
// Name returns the base name of the current directory entry while scanning a
// directory.
func (s *Scanner) Name() string { return s.childName }
// Scan potentially reads and then decodes the next directory entry from the
// file system.
//
// When it returns false, this releases resources used by the Scanner then
// returns any error associated with closing the file system directory resource.
func (s *Scanner) Scan() bool {
if s.dh == nil {
return false
}
s.de = nil
for {
// When the work buffer has nothing remaining to decode, we need to load
// more data from disk.
if len(s.workBuffer) == 0 {
n, err := syscall.ReadDirent(s.fd, s.scratchBuffer)
// n, err := unix.ReadDirent(s.fd, s.scratchBuffer)
if err != nil {
if err == syscall.EINTR /* || err == unix.EINTR */ {
continue
}
s.done(err) // any other error forces a stop
return false
}
if n <= 0 { // end of directory: normal exit
s.done(nil)
return false
}
s.workBuffer = s.scratchBuffer[:n] // trim work buffer to number of bytes read
}
// point entry to first syscall.Dirent in buffer
copy((*[unsafe.Sizeof(syscall.Dirent{})]byte)(unsafe.Pointer(&s.sde))[:], s.workBuffer)
s.workBuffer = s.workBuffer[reclen(&s.sde):] // advance buffer for next iteration through loop
if inoFromDirent(&s.sde) == 0 {
continue // inode set to 0 indicates an entry that was marked as deleted
}
nameSlice := nameFromDirent(&s.sde)
nameLength := len(nameSlice)
if nameLength == 0 || (nameSlice[0] == '.' && (nameLength == 1 || (nameLength == 2 && nameSlice[1] == '.'))) {
continue
}
s.childName = string(nameSlice)
return true
}
}

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//go:build windows
// +build windows
package godirwalk
import (
"fmt"
"os"
)
// Scanner is an iterator to enumerate the contents of a directory.
type Scanner struct {
osDirname string
childName string
dh *os.File // dh is handle to open directory
de *Dirent
err error // err is the error associated with scanning directory
childMode os.FileMode
}
// NewScanner returns a new directory Scanner that lazily enumerates
// the contents of a single directory. To prevent resource leaks,
// caller must invoke either the Scanner's Close or Err method after
// it has completed scanning a directory.
//
// scanner, err := godirwalk.NewScanner(dirname)
// if err != nil {
// fatal("cannot scan directory: %s", err)
// }
//
// for scanner.Scan() {
// dirent, err := scanner.Dirent()
// if err != nil {
// warning("cannot get dirent: %s", err)
// continue
// }
// name := dirent.Name()
// if name == "break" {
// break
// }
// if name == "continue" {
// continue
// }
// fmt.Printf("%v %v\n", dirent.ModeType(), dirent.Name())
// }
// if err := scanner.Err(); err != nil {
// fatal("cannot scan directory: %s", err)
// }
func NewScanner(osDirname string) (*Scanner, error) {
dh, err := os.Open(osDirname)
if err != nil {
return nil, err
}
scanner := &Scanner{
osDirname: osDirname,
dh: dh,
}
return scanner, nil
}
// NewScannerWithScratchBuffer returns a new directory Scanner that
// lazily enumerates the contents of a single directory. On platforms
// other than Windows it uses the provided scratch buffer to read from
// the file system. On Windows the scratch buffer parameter is
// ignored. To prevent resource leaks, caller must invoke either the
// Scanner's Close or Err method after it has completed scanning a
// directory.
func NewScannerWithScratchBuffer(osDirname string, scratchBuffer []byte) (*Scanner, error) {
return NewScanner(osDirname)
}
// Close releases resources associated with scanning a directory. Call
// either this or the Err method when the directory no longer needs to
// be scanned.
func (s *Scanner) Close() error {
return s.Err()
}
// Dirent returns the current directory entry while scanning a directory.
func (s *Scanner) Dirent() (*Dirent, error) {
if s.de == nil {
s.de = &Dirent{
name: s.childName,
path: s.osDirname,
modeType: s.childMode,
}
}
return s.de, nil
}
// done is called when directory scanner unable to continue, with either the
// triggering error, or nil when there are simply no more entries to read from
// the directory.
func (s *Scanner) done(err error) {
if s.dh == nil {
return
}
s.err = err
if err = s.dh.Close(); s.err == nil {
s.err = err
}
s.childName, s.osDirname = "", ""
s.de, s.dh = nil, nil
}
// Err returns any error associated with scanning a directory. It is
// normal to call Err after Scan returns false, even though they both
// ensure Scanner resources are released. Call either this or the
// Close method when the directory no longer needs to be scanned.
func (s *Scanner) Err() error {
s.done(nil)
return s.err
}
// Name returns the base name of the current directory entry while scanning a
// directory.
func (s *Scanner) Name() string { return s.childName }
// Scan potentially reads and then decodes the next directory entry from the
// file system.
//
// When it returns false, this releases resources used by the Scanner then
// returns any error associated with closing the file system directory resource.
func (s *Scanner) Scan() bool {
if s.dh == nil {
return false
}
s.de = nil
fileinfos, err := s.dh.Readdir(1)
if err != nil {
s.done(err)
return false
}
if l := len(fileinfos); l != 1 {
s.done(fmt.Errorf("expected a single entry rather than %d", l))
return false
}
fi := fileinfos[0]
s.childMode = fi.Mode() & os.ModeType
s.childName = fi.Name()
return true
}

44
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package godirwalk
import "sort"
type scanner interface {
Dirent() (*Dirent, error)
Err() error
Name() string
Scan() bool
}
// sortedScanner enumerates through a directory's contents after reading the
// entire directory and sorting the entries by name. Used by walk to simplify
// its implementation.
type sortedScanner struct {
dd []*Dirent
de *Dirent
}
func newSortedScanner(osPathname string, scratchBuffer []byte) (*sortedScanner, error) {
deChildren, err := ReadDirents(osPathname, scratchBuffer)
if err != nil {
return nil, err
}
sort.Sort(deChildren)
return &sortedScanner{dd: deChildren}, nil
}
func (d *sortedScanner) Err() error {
d.dd, d.de = nil, nil
return nil
}
func (d *sortedScanner) Dirent() (*Dirent, error) { return d.de, nil }
func (d *sortedScanner) Name() string { return d.de.name }
func (d *sortedScanner) Scan() bool {
if len(d.dd) > 0 {
d.de, d.dd = d.dd[0], d.dd[1:]
return true
}
return false
}

379
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package godirwalk
import (
"errors"
"fmt"
"os"
"path/filepath"
)
// Options provide parameters for how the Walk function operates.
type Options struct {
// ErrorCallback specifies a function to be invoked in the case of an error
// that could potentially be ignored while walking a file system
// hierarchy. When set to nil or left as its zero-value, any error condition
// causes Walk to immediately return the error describing what took
// place. When non-nil, this user supplied function is invoked with the OS
// pathname of the file system object that caused the error along with the
// error that took place. The return value of the supplied ErrorCallback
// function determines whether the error will cause Walk to halt immediately
// as it would were no ErrorCallback value provided, or skip this file
// system node yet continue on with the remaining nodes in the file system
// hierarchy.
//
// ErrorCallback is invoked both for errors that are returned by the
// runtime, and for errors returned by other user supplied callback
// functions.
ErrorCallback func(string, error) ErrorAction
// FollowSymbolicLinks specifies whether Walk will follow symbolic links
// that refer to directories. When set to false or left as its zero-value,
// Walk will still invoke the callback function with symbolic link nodes,
// but if the symbolic link refers to a directory, it will not recurse on
// that directory. When set to true, Walk will recurse on symbolic links
// that refer to a directory.
FollowSymbolicLinks bool
// Unsorted controls whether or not Walk will sort the immediate descendants
// of a directory by their relative names prior to visiting each of those
// entries.
//
// When set to false or left at its zero-value, Walk will get the list of
// immediate descendants of a particular directory, sort that list by
// lexical order of their names, and then visit each node in the list in
// sorted order. This will cause Walk to always traverse the same directory
// tree in the same order, however may be inefficient for directories with
// many immediate descendants.
//
// When set to true, Walk skips sorting the list of immediate descendants
// for a directory, and simply visits each node in the order the operating
// system enumerated them. This will be more fast, but with the side effect
// that the traversal order may be different from one invocation to the
// next.
Unsorted bool
// Callback is a required function that Walk will invoke for every file
// system node it encounters.
Callback WalkFunc
// PostChildrenCallback is an option function that Walk will invoke for
// every file system directory it encounters after its children have been
// processed.
PostChildrenCallback WalkFunc
// ScratchBuffer is an optional byte slice to use as a scratch buffer for
// Walk to use when reading directory entries, to reduce amount of garbage
// generation. Not all architectures take advantage of the scratch
// buffer. If omitted or the provided buffer has fewer bytes than
// MinimumScratchBufferSize, then a buffer with MinimumScratchBufferSize
// bytes will be created and used once per Walk invocation.
ScratchBuffer []byte
// AllowNonDirectory causes Walk to bypass the check that ensures it is
// being called on a directory node, or when FollowSymbolicLinks is true, a
// symbolic link that points to a directory. Leave this value false to have
// Walk return an error when called on a non-directory. Set this true to
// have Walk run even when called on a non-directory node.
AllowNonDirectory bool
}
// ErrorAction defines a set of actions the Walk function could take based on
// the occurrence of an error while walking the file system. See the
// documentation for the ErrorCallback field of the Options structure for more
// information.
type ErrorAction int
const (
// Halt is the ErrorAction return value when the upstream code wants to halt
// the walk process when a runtime error takes place. It matches the default
// action the Walk function would take were no ErrorCallback provided.
Halt ErrorAction = iota
// SkipNode is the ErrorAction return value when the upstream code wants to
// ignore the runtime error for the current file system node, skip
// processing of the node that caused the error, and continue walking the
// file system hierarchy with the remaining nodes.
SkipNode
)
// SkipThis is used as a return value from WalkFuncs to indicate that the file
// system entry named in the call is to be skipped. It is not returned as an
// error by any function.
var SkipThis = errors.New("skip this directory entry")
// WalkFunc is the type of the function called for each file system node visited
// by Walk. The pathname argument will contain the argument to Walk as a prefix;
// that is, if Walk is called with "dir", which is a directory containing the
// file "a", the provided WalkFunc will be invoked with the argument "dir/a",
// using the correct os.PathSeparator for the Go Operating System architecture,
// GOOS. The directory entry argument is a pointer to a Dirent for the node,
// providing access to both the basename and the mode type of the file system
// node.
//
// If an error is returned by the Callback or PostChildrenCallback functions,
// and no ErrorCallback function is provided, processing stops. If an
// ErrorCallback function is provided, then it is invoked with the OS pathname
// of the node that caused the error along along with the error. The return
// value of the ErrorCallback function determines whether to halt processing, or
// skip this node and continue processing remaining file system nodes.
//
// The exception is when the function returns the special value
// filepath.SkipDir. If the function returns filepath.SkipDir when invoked on a
// directory, Walk skips the directory's contents entirely. If the function
// returns filepath.SkipDir when invoked on a non-directory file system node,
// Walk skips the remaining files in the containing directory. Note that any
// supplied ErrorCallback function is not invoked with filepath.SkipDir when the
// Callback or PostChildrenCallback functions return that special value.
//
// One arguably confusing aspect of the filepath.WalkFunc API that this library
// must emulate is how a caller tells Walk to skip file system entries or
// directories. With both filepath.Walk and this Walk, when a callback function
// wants to skip a directory and not descend into its children, it returns
// filepath.SkipDir. If the callback function returns filepath.SkipDir for a
// non-directory, filepath.Walk and this library will stop processing any more
// entries in the current directory, which is what many people do not want. If
// you want to simply skip a particular non-directory entry but continue
// processing entries in the directory, a callback function must return nil. The
// implications of this API is when you want to walk a file system hierarchy and
// skip an entry, when the entry is a directory, you must return one value,
// namely filepath.SkipDir, but when the entry is a non-directory, you must
// return a different value, namely nil. In other words, to get identical
// behavior for two file system entry types you need to send different token
// values.
//
// Here is an example callback function that adheres to filepath.Walk API to
// have it skip any file system entry whose full pathname includes a particular
// substring, optSkip:
//
// func callback1(osPathname string, de *godirwalk.Dirent) error {
// if optSkip != "" && strings.Contains(osPathname, optSkip) {
// if b, err := de.IsDirOrSymlinkToDir(); b == true && err == nil {
// return filepath.SkipDir
// }
// return nil
// }
// // Process file like normal...
// return nil
// }
//
// This library attempts to eliminate some of that logic boilerplate by
// providing a new token error value, SkipThis, which a callback function may
// return to skip the current file system entry regardless of what type of entry
// it is. If the current entry is a directory, its children will not be
// enumerated, exactly as if the callback returned filepath.SkipDir. If the
// current entry is a non-directory, the next file system entry in the current
// directory will be enumerated, exactly as if the callback returned nil. The
// following example callback function has identical behavior as the previous,
// but has less boilerplate, and admittedly more simple logic.
//
// func callback2(osPathname string, de *godirwalk.Dirent) error {
// if optSkip != "" && strings.Contains(osPathname, optSkip) {
// return godirwalk.SkipThis
// }
// // Process file like normal...
// return nil
// }
type WalkFunc func(osPathname string, directoryEntry *Dirent) error
// Walk walks the file tree rooted at the specified directory, calling the
// specified callback function for each file system node in the tree, including
// root, symbolic links, and other node types.
//
// This function is often much faster than filepath.Walk because it does not
// invoke os.Stat for every node it encounters, but rather obtains the file
// system node type when it reads the parent directory.
//
// If a runtime error occurs, either from the operating system or from the
// upstream Callback or PostChildrenCallback functions, processing typically
// halts. However, when an ErrorCallback function is provided in the provided
// Options structure, that function is invoked with the error along with the OS
// pathname of the file system node that caused the error. The ErrorCallback
// function's return value determines the action that Walk will then take.
//
// func main() {
// dirname := "."
// if len(os.Args) > 1 {
// dirname = os.Args[1]
// }
// err := godirwalk.Walk(dirname, &godirwalk.Options{
// Callback: func(osPathname string, de *godirwalk.Dirent) error {
// fmt.Printf("%s %s\n", de.ModeType(), osPathname)
// return nil
// },
// ErrorCallback: func(osPathname string, err error) godirwalk.ErrorAction {
// // Your program may want to log the error somehow.
// fmt.Fprintf(os.Stderr, "ERROR: %s\n", err)
//
// // For the purposes of this example, a simple SkipNode will suffice,
// // although in reality perhaps additional logic might be called for.
// return godirwalk.SkipNode
// },
// })
// if err != nil {
// fmt.Fprintf(os.Stderr, "%s\n", err)
// os.Exit(1)
// }
// }
func Walk(pathname string, options *Options) error {
if options == nil || options.Callback == nil {
return errors.New("cannot walk without non-nil options and Callback function")
}
pathname = filepath.Clean(pathname)
var fi os.FileInfo
var err error
if options.FollowSymbolicLinks {
fi, err = os.Stat(pathname)
} else {
fi, err = os.Lstat(pathname)
}
if err != nil {
return err
}
mode := fi.Mode()
if !options.AllowNonDirectory && mode&os.ModeDir == 0 {
return fmt.Errorf("cannot Walk non-directory: %s", pathname)
}
dirent := &Dirent{
name: filepath.Base(pathname),
path: filepath.Dir(pathname),
modeType: mode & os.ModeType,
}
if len(options.ScratchBuffer) < MinimumScratchBufferSize {
options.ScratchBuffer = newScratchBuffer()
}
// If ErrorCallback is nil, set to a default value that halts the walk
// process on all operating system errors. This is done to allow error
// handling to be more succinct in the walk code.
if options.ErrorCallback == nil {
options.ErrorCallback = defaultErrorCallback
}
err = walk(pathname, dirent, options)
switch err {
case nil, SkipThis, filepath.SkipDir:
// silence SkipThis and filepath.SkipDir for top level
debug("no error of significance: %v\n", err)
return nil
default:
return err
}
}
// defaultErrorCallback always returns Halt because if the upstream code did not
// provide an ErrorCallback function, walking the file system hierarchy ought to
// halt upon any operating system error.
func defaultErrorCallback(_ string, _ error) ErrorAction { return Halt }
// walk recursively traverses the file system node specified by pathname and the
// Dirent.
func walk(osPathname string, dirent *Dirent, options *Options) error {
err := options.Callback(osPathname, dirent)
if err != nil {
if err == SkipThis || err == filepath.SkipDir {
return err
}
if action := options.ErrorCallback(osPathname, err); action == SkipNode {
return nil
}
return err
}
if dirent.IsSymlink() {
if !options.FollowSymbolicLinks {
return nil
}
// Does this symlink point to a directory?
info, err := os.Stat(osPathname)
if err != nil {
if action := options.ErrorCallback(osPathname, err); action == SkipNode {
return nil
}
return err
}
if !info.IsDir() {
return nil
}
} else if !dirent.IsDir() {
return nil
}
// If get here, then specified pathname refers to a directory or a
// symbolic link to a directory.
var ds scanner
if options.Unsorted {
// When upstream does not request a sorted iteration, it's more memory
// efficient to read a single child at a time from the file system.
ds, err = NewScanner(osPathname)
} else {
// When upstream wants a sorted iteration, we must read the entire
// directory and sort through the child names, and then iterate on each
// child.
ds, err = newSortedScanner(osPathname, options.ScratchBuffer)
}
if err != nil {
if action := options.ErrorCallback(osPathname, err); action == SkipNode {
return nil
}
return err
}
for ds.Scan() {
deChild, err := ds.Dirent()
osChildname := filepath.Join(osPathname, deChild.name)
if err != nil {
if action := options.ErrorCallback(osChildname, err); action == SkipNode {
return nil
}
return err
}
err = walk(osChildname, deChild, options)
debug("osChildname: %q; error: %v\n", osChildname, err)
if err == nil || err == SkipThis {
continue
}
if err != filepath.SkipDir {
return err
}
// When received SkipDir on a directory or a symbolic link to a
// directory, stop processing that directory but continue processing
// siblings. When received on a non-directory, stop processing
// remaining siblings.
isDir, err := deChild.IsDirOrSymlinkToDir()
if err != nil {
if action := options.ErrorCallback(osChildname, err); action == SkipNode {
continue // ignore and continue with next sibling
}
return err // caller does not approve of this error
}
if !isDir {
break // stop processing remaining siblings, but allow post children callback
}
// continue processing remaining siblings
}
if err = ds.Err(); err != nil {
return err
}
if options.PostChildrenCallback == nil {
return nil
}
err = options.PostChildrenCallback(osPathname, dirent)
if err == nil || err == filepath.SkipDir {
return err
}
if action := options.ErrorCallback(osPathname, err); action == SkipNode {
return nil
}
return err
}