From 0d623914d01bcbc10beebf2db966e17da215dfbb Mon Sep 17 00:00:00 2001 From: Matthew Heon Date: Thu, 17 Oct 2019 11:25:28 -0400 Subject: Add support for anonymous volumes to `podman run -v` Previously, when `podman run` encountered a volume mount without separate source and destination (e.g. `-v /run`) we would assume that both were the same - a bind mount of `/run` on the host to `/run` in the container. However, this does not match Docker's behavior - in Docker, this makes an anonymous named volume that will be mounted at `/run`. We already have (more limited) support for these anonymous volumes in the form of image volumes. Extend this support to allow it to be used with user-created volumes coming in from the `-v` flag. This change also affects how named volumes created by the container but given names are treated by `podman run --rm` and `podman rm -v`. Previously, they would be removed with the container in these cases, but this did not match Docker's behaviour. Docker only removed anonymous volumes. With this patch we move to that model as well; `podman run -v testvol:/test` will not have `testvol` survive the container being removed by `podman rm -v`. The sum total of these changes let us turn on volume removal in `--rm` by default. Fixes: #4276 Signed-off-by: Matthew Heon --- pkg/spec/storage.go | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) (limited to 'pkg/spec') diff --git a/pkg/spec/storage.go b/pkg/spec/storage.go index 93919dd0a..a394a19ae 100644 --- a/pkg/spec/storage.go +++ b/pkg/spec/storage.go @@ -11,7 +11,6 @@ import ( "github.com/containers/libpod/libpod" "github.com/containers/libpod/pkg/util" pmount "github.com/containers/storage/pkg/mount" - "github.com/containers/storage/pkg/stringid" spec "github.com/opencontainers/runtime-spec/specs-go" "github.com/pkg/errors" "github.com/sirupsen/logrus" @@ -648,7 +647,7 @@ func (config *CreateConfig) getVolumeMounts() (map[string]spec.Mount, map[string mounts := make(map[string]spec.Mount) volumes := make(map[string]*libpod.ContainerNamedVolume) - volumeFormatErr := errors.Errorf("incorrect volume format, should be host-dir:ctr-dir[:option]") + volumeFormatErr := errors.Errorf("incorrect volume format, should be [host-dir:]ctr-dir[:option]") for _, vol := range config.Volumes { var ( @@ -665,7 +664,11 @@ func (config *CreateConfig) getVolumeMounts() (map[string]spec.Mount, map[string src = splitVol[0] if len(splitVol) == 1 { - dest = src + // This is an anonymous named volume. Only thing given + // is destination. + // Name/source will be blank, and populated by libpod. + src = "" + dest = splitVol[0] } else if len(splitVol) > 1 { dest = splitVol[1] } @@ -675,8 +678,11 @@ func (config *CreateConfig) getVolumeMounts() (map[string]spec.Mount, map[string } } - if err := parse.ValidateVolumeHostDir(src); err != nil { - return nil, nil, err + // Do not check source dir for anonymous volumes + if len(splitVol) > 1 { + if err := parse.ValidateVolumeHostDir(src); err != nil { + return nil, nil, err + } } if err := parse.ValidateVolumeCtrDir(dest); err != nil { return nil, nil, err @@ -736,8 +742,8 @@ func (config *CreateConfig) getImageVolumes() (map[string]spec.Mount, map[string } mounts[vol] = mount } else { + // Anonymous volumes have no name. namedVolume := new(libpod.ContainerNamedVolume) - namedVolume.Name = stringid.GenerateNonCryptoID() namedVolume.Options = []string{"rprivate", "rw", "nodev"} namedVolume.Dest = cleanDest volumes[vol] = namedVolume -- cgit v1.2.3-54-g00ecf