forked from jessfraz/buildkit
/
user.go
86 lines (77 loc) · 1.57 KB
/
user.go
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package oci
import (
"context"
"os"
"strconv"
"strings"
"github.com/containerd/continuity/fs"
"github.com/opencontainers/runc/libcontainer/user"
)
func GetUser(ctx context.Context, root, username string) (uint32, uint32, error) {
// fast path from uid/gid
if uid, gid, err := ParseUser(username); err == nil {
return uid, gid, nil
}
passwdPath, err := user.GetPasswdPath()
if err != nil {
return 0, 0, err
}
groupPath, err := user.GetGroupPath()
if err != nil {
return 0, 0, err
}
passwdFile, err := openUserFile(root, passwdPath)
if err == nil {
defer passwdFile.Close()
}
groupFile, err := openUserFile(root, groupPath)
if err == nil {
defer groupFile.Close()
}
execUser, err := user.GetExecUser(username, nil, passwdFile, groupFile)
if err != nil {
return 0, 0, err
}
return uint32(execUser.Uid), uint32(execUser.Gid), nil
}
func ParseUser(str string) (uid uint32, gid uint32, err error) {
if str == "" {
return 0, 0, nil
}
parts := strings.SplitN(str, ":", 2)
for i, v := range parts {
switch i {
case 0:
uid, err = parseUID(v)
if err != nil {
return 0, 0, err
}
if len(parts) == 1 {
gid = uid
}
case 1:
gid, err = parseUID(v)
if err != nil {
return 0, 0, err
}
}
}
return
}
func openUserFile(root, p string) (*os.File, error) {
p, err := fs.RootPath(root, p)
if err != nil {
return nil, err
}
return os.Open(p)
}
func parseUID(str string) (uint32, error) {
if str == "root" {
return 0, nil
}
uid, err := strconv.ParseUint(str, 10, 32)
if err != nil {
return 0, err
}
return uint32(uid), nil
}