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podman: add uid and gid options to keep-id

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add two new options to the keep-id user namespace option:

- uid: allow to override the UID used inside the container.
- gid: allow to override the GID used inside the container.

For example, the following command will map the rootless user (that
has UID=0 inside the rootless user namespace) to the UID=11 inside the
container user namespace:

$ podman run --userns=keep-id:uid=11 --rm -ti  fedora cat /proc/self/uid_map
         0          1         11
        11          0          1
        12         12      65525

Closes: https://github.com/containers/podman/issues/15294

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano
2022-08-19 15:15:47 +02:00
parent cd62606046
commit e015c9e3f7
8 changed files with 103 additions and 5 deletions
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8
pkg/util/utils.go
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@ -342,7 +342,7 @@ func ParseSignal(rawSignal string) (syscall.Signal, error) {
}
// GetKeepIDMapping returns the mappings and the user to use when keep-id is used
func GetKeepIDMapping() (*stypes.IDMappingOptions, int, int, error) {
func GetKeepIDMapping(opts *namespaces.KeepIDUserNsOptions) (*stypes.IDMappingOptions, int, int, error) {
if !rootless.IsRootless() {
return nil, -1, -1, errors.New("keep-id is only supported in rootless mode")
}
@ -359,6 +359,12 @@ func GetKeepIDMapping() (*stypes.IDMappingOptions, int, int, error) {
uid := rootless.GetRootlessUID()
gid := rootless.GetRootlessGID()
if opts.UID != nil {
uid = int(*opts.UID)
}
if opts.GID != nil {
gid = int(*opts.GID)
}
uids, gids, err := rootless.GetConfiguredMappings()
if err != nil {