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Clean destination paths during mount generation

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We identify and resolve conflicts in paths using destination path
matches. We require exact matches, largely for performance
reasons (we use maps to efficiently access, keyed by
destination). This usually works fine, until you get mounts that
are targetted at /output and /output/ - the same path, but not
the same string.

Use filepath.Clean() aggressively to try and solve this.

Signed-off-by: Matthew Heon <matthew.heon@pm.me>
This commit is contained in:
Matthew Heon
2019-09-19 11:09:59 -04:00
parent 408f2780a1
commit 720d8c9e3f
1 changed files with 12 additions and 8 deletions
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20
pkg/spec/storage.go
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@ -220,6 +220,7 @@ func (config *CreateConfig) parseVolumes(runtime *libpod.Runtime) ([]spec.Mount,
// volumes, and return a list of them.
// Conflicts are resolved simply - the last container specified wins.
// Container names may be suffixed by mount options after a colon.
// TODO: We should clean these paths if possible
func (config *CreateConfig) getVolumesFrom(runtime *libpod.Runtime) (map[string]spec.Mount, map[string]*libpod.ContainerNamedVolume, error) {
// Both of these are maps of mount destination to mount type.
// We ensure that each destination is only mounted to once in this way.
@ -465,7 +466,7 @@ func getBindMount(args []string) (spec.Mount, error) {
if err := parse.ValidateVolumeCtrDir(kv[1]); err != nil {
return newMount, err
}
newMount.Destination = kv[1]
newMount.Destination = filepath.Clean(kv[1])
setDest = true
case "relabel":
if setRelabel {
@ -559,7 +560,7 @@ func getTmpfsMount(args []string) (spec.Mount, error) {
if err := parse.ValidateVolumeCtrDir(kv[1]); err != nil {
return newMount, err
}
newMount.Destination = kv[1]
newMount.Destination = filepath.Clean(kv[1])
setDest = true
default:
return newMount, errors.Wrapf(util.ErrBadMntOption, kv[0])
@ -623,7 +624,7 @@ func getNamedVolume(args []string) (*libpod.ContainerNamedVolume, error) {
if err := parse.ValidateVolumeCtrDir(kv[1]); err != nil {
return nil, err
}
newVolume.Dest = kv[1]
newVolume.Dest = filepath.Clean(kv[1])
setDest = true
default:
return nil, errors.Wrapf(util.ErrBadMntOption, kv[0])
@ -678,10 +679,12 @@ func (config *CreateConfig) getVolumeMounts() (map[string]spec.Mount, map[string
return nil, nil, err
}
cleanDest := filepath.Clean(dest)
if strings.HasPrefix(src, "/") || strings.HasPrefix(src, ".") {
// This is not a named volume
newMount := spec.Mount{
Destination: dest,
Destination: cleanDest,
Type: string(TypeBind),
Source: src,
Options: options,
@ -694,7 +697,7 @@ func (config *CreateConfig) getVolumeMounts() (map[string]spec.Mount, map[string
// This is a named volume
newNamedVol := new(libpod.ContainerNamedVolume)
newNamedVol.Name = src
newNamedVol.Dest = dest
newNamedVol.Dest = cleanDest
newNamedVol.Options = options
if _, ok := volumes[newNamedVol.Dest]; ok {
@ -719,10 +722,11 @@ func (config *CreateConfig) getImageVolumes() (map[string]spec.Mount, map[string
}
for vol := range config.BuiltinImgVolumes {
cleanDest := filepath.Clean(vol)
if config.ImageVolumeType == "tmpfs" {
// Tmpfs image volumes are handled as mounts
mount := spec.Mount{
Destination: vol,
Destination: cleanDest,
Source: TypeTmpfs,
Type: TypeTmpfs,
Options: []string{"rprivate", "rw", "nodev"},
@ -732,7 +736,7 @@ func (config *CreateConfig) getImageVolumes() (map[string]spec.Mount, map[string
namedVolume := new(libpod.ContainerNamedVolume)
namedVolume.Name = stringid.GenerateNonCryptoID()
namedVolume.Options = []string{"rprivate", "rw", "nodev"}
namedVolume.Dest = vol
namedVolume.Dest = cleanDest
volumes[vol] = namedVolume
}
}
@ -760,7 +764,7 @@ func (config *CreateConfig) getTmpfsMounts() (map[string]spec.Mount, error) {
}
mount := spec.Mount{
Destination: destPath,
Destination: filepath.Clean(destPath),
Type: string(TypeTmpfs),
Options: options,
Source: string(TypeTmpfs),