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authorEduardo Vega <edvegavalerio@gmail.com>2021-01-05 19:50:58 -0600
committerEduardo Vega <edvegavalerio@gmail.com>2021-02-22 22:55:19 -0600
commit874f2327e6ca963edda7cc46819d51048d3d19a8 (patch)
tree2b138dda345970e5898593162c38e10d4909fabd /vendor/github.com
parent96fc9d983e0fc5bae48c3cec3acce86cdb6e1059 (diff)
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Add U volume flag to chown source volumes
Signed-off-by: Eduardo Vega <edvegavalerio@gmail.com>
Diffstat (limited to 'vendor/github.com')
-rw-r--r--vendor/github.com/containers/common/pkg/chown/chown.go122
1 files changed, 122 insertions, 0 deletions
diff --git a/vendor/github.com/containers/common/pkg/chown/chown.go b/vendor/github.com/containers/common/pkg/chown/chown.go
new file mode 100644
index 000000000..fe794304e
--- /dev/null
+++ b/vendor/github.com/containers/common/pkg/chown/chown.go
@@ -0,0 +1,122 @@
+package chown
+
+import (
+ "os"
+ "os/user"
+ "path/filepath"
+ "syscall"
+
+ "github.com/containers/storage/pkg/homedir"
+ "github.com/pkg/errors"
+)
+
+// DangerousHostPath validates if a host path is dangerous and should not be modified
+func DangerousHostPath(path string) (bool, error) {
+ excludePaths := map[string]bool{
+ "/": true,
+ "/bin": true,
+ "/boot": true,
+ "/dev": true,
+ "/etc": true,
+ "/etc/passwd": true,
+ "/etc/pki": true,
+ "/etc/shadow": true,
+ "/home": true,
+ "/lib": true,
+ "/lib64": true,
+ "/media": true,
+ "/opt": true,
+ "/proc": true,
+ "/root": true,
+ "/run": true,
+ "/sbin": true,
+ "/srv": true,
+ "/sys": true,
+ "/tmp": true,
+ "/usr": true,
+ "/var": true,
+ "/var/lib": true,
+ "/var/log": true,
+ }
+
+ if home := homedir.Get(); home != "" {
+ excludePaths[home] = true
+ }
+
+ if sudoUser := os.Getenv("SUDO_USER"); sudoUser != "" {
+ if usr, err := user.Lookup(sudoUser); err == nil {
+ excludePaths[usr.HomeDir] = true
+ }
+ }
+
+ absPath, err := filepath.Abs(path)
+ if err != nil {
+ return true, err
+ }
+
+ realPath, err := filepath.EvalSymlinks(absPath)
+ if err != nil {
+ return true, err
+ }
+
+ if excludePaths[realPath] {
+ return true, nil
+ }
+
+ return false, nil
+}
+
+// ChangeHostPathOwnership changes the uid and gid ownership of a directory or file within the host.
+// This is used by the volume U flag to change source volumes ownership
+func ChangeHostPathOwnership(path string, recursive bool, uid, gid int) error {
+ // Validate if host path can be chowned
+ isDangerous, err := DangerousHostPath(path)
+ if err != nil {
+ return errors.Wrapf(err, "failed to validate if host path is dangerous")
+ }
+
+ if isDangerous {
+ return errors.Errorf("chowning host path %q is not allowed. You can manually `chown -R %d:%d %s`", path, uid, gid, path)
+ }
+
+ // Chown host path
+ if recursive {
+ err := filepath.Walk(path, func(filePath string, f os.FileInfo, err error) error {
+ if err != nil {
+ return err
+ }
+
+ // Get current ownership
+ currentUID := int(f.Sys().(*syscall.Stat_t).Uid)
+ currentGID := int(f.Sys().(*syscall.Stat_t).Gid)
+
+ if uid != currentUID || gid != currentGID {
+ return os.Lchown(filePath, uid, gid)
+ }
+
+ return nil
+ })
+
+ if err != nil {
+ return errors.Wrapf(err, "failed to chown recursively host path")
+ }
+ } else {
+ // Get host path info
+ f, err := os.Lstat(path)
+ if err != nil {
+ return errors.Wrapf(err, "failed to get host path information")
+ }
+
+ // Get current ownership
+ currentUID := int(f.Sys().(*syscall.Stat_t).Uid)
+ currentGID := int(f.Sys().(*syscall.Stat_t).Gid)
+
+ if uid != currentUID || gid != currentGID {
+ if err := os.Lchown(path, uid, gid); err != nil {
+ return errors.Wrapf(err, "failed to chown host path")
+ }
+ }
+ }
+
+ return nil
+}