dep: add github.com/ceph/go-ceph for rbd API

Signed-off-by: Niels de Vos <ndevos@redhat.com>

vendor/github.com/ceph/go-ceph/rados/rados.go

@@ -0,0 +1,137 @@
+package rados
+
+// #cgo LDFLAGS: -lrados
+// #include <errno.h>
+// #include <stdlib.h>
+// #include <rados/librados.h>
+import "C"
+
+import (
+	"fmt"
+	"runtime"
+	"unsafe"
+
+	"github.com/ceph/go-ceph/errutil"
+)
+
+// RadosError represents an error condition returned from the Ceph RADOS APIs.
+type RadosError int
+
+// Error returns the error string for the RadosError type.
+func (e RadosError) Error() string {
+	errno, s := errutil.FormatErrno(int(e))
+	if s == "" {
+		return fmt.Sprintf("rados: ret=%d", errno)
+	}
+	return fmt.Sprintf("rados: ret=%d, %s", errno, s)
+}
+
+const (
+	// AllNamespaces is used to reset a selected namespace to all
+	// namespaces. See the IOContext SetNamespace function.
+	AllNamespaces = C.LIBRADOS_ALL_NSPACES
+
+	// ErrNotFound indicates a missing resource.
+	ErrNotFound = RadosError(-C.ENOENT)
+	// ErrPermissionDenied indicates a permissions issue.
+	ErrPermissionDenied = RadosError(-C.EPERM)
+	// ErrObjectExists indicates that an exclusive object creation failed.
+	ErrObjectExists = RadosError(-C.EEXIST)
+
+	// FIXME: for backwards compatibility
+
+	// RadosAllNamespaces is used to reset a selected namespace to all
+	// namespaces. See the IOContext SetNamespace function.
+	//
+	// Deprecated: use AllNamespaces instead
+	RadosAllNamespaces = AllNamespaces
+	// RadosErrorNotFound indicates a missing resource.
+	//
+	// Deprecated: use ErrNotFound instead
+	RadosErrorNotFound = ErrNotFound
+	// RadosErrorPermissionDenied indicates a permissions issue.
+	//
+	// Deprecated: use ErrPermissionDenied instead
+	RadosErrorPermissionDenied = ErrPermissionDenied
+)
+
+func getRadosError(err int) error {
+	if err == 0 {
+		return nil
+	}
+	return RadosError(err)
+}
+
+// Version returns the major, minor, and patch components of the version of
+// the RADOS library linked against.
+func Version() (int, int, int) {
+	var c_major, c_minor, c_patch C.int
+	C.rados_version(&c_major, &c_minor, &c_patch)
+	return int(c_major), int(c_minor), int(c_patch)
+}
+
+func makeConn() *Conn {
+	return &Conn{connected: false}
+}
+
+func newConn(user *C.char) (*Conn, error) {
+	conn := makeConn()
+	ret := C.rados_create(&conn.cluster, user)
+
+	if ret != 0 {
+		return nil, RadosError(int(ret))
+	}
+
+	runtime.SetFinalizer(conn, freeConn)
+	return conn, nil
+}
+
+// NewConn creates a new connection object. It returns the connection and an
+// error, if any.
+func NewConn() (*Conn, error) {
+	return newConn(nil)
+}
+
+// NewConnWithUser creates a new connection object with a custom username.
+// It returns the connection and an error, if any.
+func NewConnWithUser(user string) (*Conn, error) {
+	c_user := C.CString(user)
+	defer C.free(unsafe.Pointer(c_user))
+	return newConn(c_user)
+}
+
+// NewConnWithClusterAndUser creates a new connection object for a specific cluster and username.
+// It returns the connection and an error, if any.
+func NewConnWithClusterAndUser(clusterName string, userName string) (*Conn, error) {
+	c_cluster_name := C.CString(clusterName)
+	defer C.free(unsafe.Pointer(c_cluster_name))
+
+	c_name := C.CString(userName)
+	defer C.free(unsafe.Pointer(c_name))
+
+	conn := makeConn()
+	ret := C.rados_create2(&conn.cluster, c_cluster_name, c_name, 0)
+	if ret != 0 {
+		return nil, RadosError(int(ret))
+	}
+
+	runtime.SetFinalizer(conn, freeConn)
+	return conn, nil
+}
+
+// freeConn releases resources that are allocated while configuring the
+// connection to the cluster. rados_shutdown() should only be needed after a
+// successful call to rados_connect(), however if the connection has been
+// configured with non-default parameters, some of the parameters may be
+// allocated before connecting. rados_shutdown() will free the allocated
+// resources, even if there has not been a connection yet.
+//
+// This function is setup as a destructor/finalizer when rados_create() is
+// called.
+func freeConn(conn *Conn) {
+	if conn.cluster != nil {
+		C.rados_shutdown(conn.cluster)
+		// prevent calling rados_shutdown() more than once
+		conn.cluster = nil
+	}
+}