mirror of
https://github.com/containers/podman
synced 2024-10-20 17:23:30 +00:00
00d38cb379
We should be pulling information out of the image to set the defaults to use when setting up the container. Signed-off-by: Daniel J Walsh <dwalsh@redhat.com> Closes: #110 Approved by: mheon
72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
package chrootuser
|
|
|
|
import (
|
|
"os/user"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
// GetUser will return the uid, gid of the user specified in the userspec
|
|
// it will use the /etc/password and /etc/shadow files inside of the rootdir
|
|
// to return this information.
|
|
// userspace format [user | user:group | uid | uid:gid | user:gid | uid:group ]
|
|
func GetUser(rootdir, userspec string) (uint32, uint32, error) {
|
|
var gid64 uint64
|
|
var gerr error = user.UnknownGroupError("error looking up group")
|
|
|
|
spec := strings.SplitN(userspec, ":", 2)
|
|
userspec = spec[0]
|
|
groupspec := ""
|
|
if userspec == "" {
|
|
return 0, 0, nil
|
|
}
|
|
if len(spec) > 1 {
|
|
groupspec = spec[1]
|
|
}
|
|
|
|
uid64, uerr := strconv.ParseUint(userspec, 10, 32)
|
|
if uerr == nil && groupspec == "" {
|
|
// We parsed the user name as a number, and there's no group
|
|
// component, so try to look up the primary GID of the user who
|
|
// has this UID.
|
|
var name string
|
|
name, gid64, gerr = lookupGroupForUIDInContainer(rootdir, uid64)
|
|
if gerr == nil {
|
|
userspec = name
|
|
} else {
|
|
// Leave userspec alone, but swallow the error and just
|
|
// use GID 0.
|
|
gid64 = 0
|
|
gerr = nil
|
|
}
|
|
}
|
|
if uerr != nil {
|
|
// The user ID couldn't be parsed as a number, so try to look
|
|
// up the user's UID and primary GID.
|
|
uid64, gid64, uerr = lookupUserInContainer(rootdir, userspec)
|
|
gerr = uerr
|
|
}
|
|
|
|
if groupspec != "" {
|
|
// We have a group name or number, so parse it.
|
|
gid64, gerr = strconv.ParseUint(groupspec, 10, 32)
|
|
if gerr != nil {
|
|
// The group couldn't be parsed as a number, so look up
|
|
// the group's GID.
|
|
gid64, gerr = lookupGroupInContainer(rootdir, groupspec)
|
|
}
|
|
}
|
|
|
|
if uerr == nil && gerr == nil {
|
|
return uint32(uid64), uint32(gid64), nil
|
|
}
|
|
|
|
err := errors.Wrapf(uerr, "error determining run uid")
|
|
if uerr == nil {
|
|
err = errors.Wrapf(gerr, "error determining run gid")
|
|
}
|
|
return 0, 0, err
|
|
}
|