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nfs: support new and old NFS-management commands

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The `ceph nfs export ...` commands have changed in recent Ceph releases.
Use the most recent command as a default, fall back to the older command
when an error is reported.

This shoud make the NFS-provisioner work on any current Ceph version.

Signed-off-by: Niels de Vos <ndevos@redhat.com>
This commit is contained in:
Niels de Vos 2022-03-30 18:00:32 +02:00 committed by mergify[bot]
parent f90408be4d
commit 1da19680b4
1 changed files with 84 additions and 22 deletions
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102
internal/nfs/controller/volume.go
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@ -19,6 +19,7 @@ package controller
import (
"context"
"fmt"
"strings"
fscore "github.com/ceph/ceph-csi/internal/cephfs/core"
"github.com/ceph/ceph-csi/internal/cephfs/store"
@ -134,8 +135,60 @@ func (nv *NFSVolume) CreateExport(backend *csi.Volume) error {
return fmt.Errorf("failed to set NFS-cluster: %w", err)
}
// TODO: use new go-ceph API, see ceph/ceph-csi#2977
// new versions of Ceph use a different command, and the go-ceph API
// also seems to be different :-/
//
// run the new command, but fall back to the previous one in case of an
// error
cmds := [][]string{
// ceph nfs export create cephfs --cluster-id <cluster_id>
// --pseudo-path <pseudo_path> --fsname <fsname>
// [--readonly] [--path=/path/in/cephfs]
nv.createExportCommand("--cluster-id="+nfsCluster,
"--fsname="+fs, "--pseudo-path="+nv.GetExportPath(),
"--path="+path),
// ceph nfs export create cephfs ${FS} ${NFS} /${EXPORT} ${SUBVOL_PATH}
args := []string{
nv.createExportCommand(nfsCluster, fs, nv.GetExportPath(), path),
}
stderr, err := nv.retryIfInvalid(cmds)
if err != nil {
return fmt.Errorf("failed to create export %q in NFS-cluster %q"+
"(%v): %s", nv, nfsCluster, err, stderr)
}
return nil
}
// retryIfInvalid executes the "ceph" command, and falls back to the next cmd
// in case the error is EINVAL.
func (nv *NFSVolume) retryIfInvalid(cmds [][]string) (string, error) {
var (
stderr string
err error
)
for _, cmd := range cmds {
_, stderr, err = util.ExecCommand(nv.ctx, "ceph", cmd...)
// in case of an invalid command, fallback to the next one
if strings.Contains(stderr, "Error EINVAL: invalid command") {
continue
}
// If we get here, either no error, or an unexpected error
// happened. There is no need to retry an other command.
break
}
return stderr, err
}
// createExportCommand returns the "ceph nfs export create ..." command
// arguments (without "ceph"). The order of the parameters matches old Ceph
// releases, new Ceph releases added --option formats, which can be added when
// passing the parameters to this function.
func (nv *NFSVolume) createExportCommand(nfsCluster, fs, export, path string) []string {
return []string{
"--id", nv.cr.ID,
"--keyfile=" + nv.cr.KeyFile,
"-m", nv.mons,
@ -145,17 +198,9 @@ func (nv *NFSVolume) CreateExport(backend *csi.Volume) error {
"cephfs",
fs,
nfsCluster,
nv.GetExportPath(),
export,
path,
}
// TODO: use new go-ceph API
_, stderr, err := util.ExecCommand(nv.ctx, "ceph", args...)
if err != nil {
return fmt.Errorf("executing ceph export command failed (%w): %s", err, stderr)
}
return nil
}
// DeleteExport removes the NFS-export from the Ceph managed NFS-server.
@ -169,25 +214,42 @@ func (nv *NFSVolume) DeleteExport() error {
return fmt.Errorf("failed to identify NFS cluster: %w", err)
}
// TODO: use new go-ceph API, see ceph/ceph-csi#2977
// new versions of Ceph use a different command, and the go-ceph API
// also seems to be different :-/
//
// run the new command, but fall back to the previous one in case of an
// error
cmds := [][]string{
// ceph nfs export rm <cluster_id> <pseudo_path>
args := []string{
nv.deleteExportCommand("rm", nfsCluster),
// ceph nfs export delete <cluster_id> <pseudo_path>
nv.deleteExportCommand("delete", nfsCluster),
}
stderr, err := nv.retryIfInvalid(cmds)
if err != nil {
return fmt.Errorf("failed to delete export %q from NFS-cluster"+
"%q (%v): %s", nv, nfsCluster, err, stderr)
}
return nil
}
// deleteExportCommand returns the "ceph nfs export delete ..." command
// arguments (without "ceph"). Old releases of Ceph expect "delete" as cmd,
// newer releases use "rm".
func (nv *NFSVolume) deleteExportCommand(cmd, nfsCluster string) []string {
return []string{
"--id", nv.cr.ID,
"--keyfile=" + nv.cr.KeyFile,
"-m", nv.mons,
"nfs",
"export",
"delete",
cmd,
nfsCluster,
nv.GetExportPath(),
}
// TODO: use new go-ceph API
_, stderr, err := util.ExecCommand(nv.ctx, "ceph", args...)
if err != nil {
return fmt.Errorf("executing ceph export command failed (%w): %s", err, stderr)
}
return nil
}
// getNFSCluster fetches the NFS-cluster name from the CephFS journal.