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authorValentin Rothberg <rothberg@redhat.com>2020-09-16 14:09:03 +0200
committerValentin Rothberg <rothberg@redhat.com>2020-09-16 14:18:40 +0200
commit067c13b384454feab70b52faeb50157749a03252 (patch)
tree543050b48d5ff9b5390f74cab52b51ba4d5cc1a3 /cmd/podman
parent0d14d7b7152ac7a0856fcbb2bbc0f7238ab182d6 (diff)
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--mount: support arbitrary mount-argument order
Support an arbitrary order in which arguments are specified to the `--mount` flag. Previously, Podman expected `type=...` to come first which was breaking compatibility with Docker. Note that this is the ground work to default to "volume" (again Docker compat). However, this will require some further massaging as we have to assign a name. Fixes: #7628 Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
Diffstat (limited to 'cmd/podman')
-rw-r--r--cmd/podman/common/volumes.go46
1 files changed, 28 insertions, 18 deletions
diff --git a/cmd/podman/common/volumes.go b/cmd/podman/common/volumes.go
index ca0b10765..2a82451e4 100644
--- a/cmd/podman/common/volumes.go
+++ b/cmd/podman/common/volumes.go
@@ -28,6 +28,7 @@ var (
errDuplicateDest = errors.Errorf("duplicate mount destination")
optionArgError = errors.Errorf("must provide an argument for option")
noDestError = errors.Errorf("must set volume destination")
+ errInvalidSyntax = errors.Errorf("incorrect mount format: should be --mount type=<bind|tmpfs|volume>,[src=<host-dir|volume-name>,]target=<ctr-dir>[,options]")
)
// Parse all volume-related options in the create config into a set of mounts
@@ -147,6 +148,27 @@ func parseVolumes(volumeFlag, mountFlag, tmpfsFlag []string, addReadOnlyTmpfs bo
return finalMounts, finalVolumes, finalOverlayVolume, nil
}
+// findMountType parses the input and extracts the type of the mount type and
+// the remaining non-type tokens.
+func findMountType(input string) (mountType string, tokens []string, err error) {
+ // Split by comma, iterate over the slice and look for
+ // "type=$mountType". Everything else is appended to tokens.
+ found := false
+ for _, s := range strings.Split(input, ",") {
+ kv := strings.Split(s, "=")
+ if found || !(len(kv) == 2 && kv[0] == "type") {
+ tokens = append(tokens, s)
+ continue
+ }
+ mountType = kv[1]
+ found = true
+ }
+ if !found {
+ err = errInvalidSyntax
+ }
+ return
+}
+
// getMounts takes user-provided input from the --mount flag and creates OCI
// spec mounts and Libpod named volumes.
// podman run --mount type=bind,src=/etc/resolv.conf,target=/etc/resolv.conf ...
@@ -156,25 +178,13 @@ func getMounts(mountFlag []string) (map[string]spec.Mount, map[string]*specgen.N
finalMounts := make(map[string]spec.Mount)
finalNamedVolumes := make(map[string]*specgen.NamedVolume)
- errInvalidSyntax := errors.Errorf("incorrect mount format: should be --mount type=<bind|tmpfs|volume>,[src=<host-dir|volume-name>,]target=<ctr-dir>[,options]")
-
- // TODO(vrothberg): the manual parsing can be replaced with a regular expression
- // to allow a more robust parsing of the mount format and to give
- // precise errors regarding supported format versus supported options.
for _, mount := range mountFlag {
- arr := strings.SplitN(mount, ",", 2)
- if len(arr) < 2 {
- return nil, nil, errors.Wrapf(errInvalidSyntax, "%q", mount)
+ // TODO: Docker defaults to "volume" if no mount type is specified.
+ mountType, tokens, err := findMountType(mount)
+ if err != nil {
+ return nil, nil, err
}
- kv := strings.Split(arr[0], "=")
- // TODO: type is not explicitly required in Docker.
- // If not specified, it defaults to "volume".
- if len(kv) != 2 || kv[0] != "type" {
- return nil, nil, errors.Wrapf(errInvalidSyntax, "%q", mount)
- }
-
- tokens := strings.Split(arr[1], ",")
- switch kv[1] {
+ switch mountType {
case TypeBind:
mount, err := getBindMount(tokens)
if err != nil {
@@ -212,7 +222,7 @@ func getMounts(mountFlag []string) (map[string]spec.Mount, map[string]*specgen.N
}
finalNamedVolumes[volume.Dest] = volume
default:
- return nil, nil, errors.Errorf("invalid filesystem type %q", kv[1])
+ return nil, nil, errors.Errorf("invalid filesystem type %q", mountType)
}
}