Silently ignore lchmod failure in when not supported

lchmod might be defined but not supported by the platform,
(this is the case with musl implementation of fchmodat) in
this case we can safely ignore the error.

diff --git a/libarchive/archive_write_disk_posix.c b/libarchive/archive_write_disk_posix.c
index 3deb5515c54415edc029e9b637775092765e142a..ff2173f218b65d1b54b24226a0d7265c48ed9d13 100644 (file)
--- a/libarchive/archive_write_disk_posix.c
+++ b/libarchive/archive_write_disk_posix.c
@@ -3056,9 +3056,21 @@ set_mode(struct archive_write_disk *a, int mode)
                 * impact.
                 */
                if (lchmod(a->name, mode) != 0) {
-                       archive_set_error(&a->archive, errno,
-                           "Can't set permissions to 0%o", (int)mode);
-                       r = ARCHIVE_WARN;
+                       switch (errno) {
+                       case ENOTSUP:
+                       case ENOSYS:
+                       case EOPNOTSUPP:
+                               /*
+                                * if lchmod is defined but the platform
+                                * doesn't support it, silently ignore
+                                * error
+                                */
+                               break;
+                       default:
+                               archive_set_error(&a->archive, errno,
+                                   "Can't set permissions to 0%o", (int)mode);
+                               r = ARCHIVE_WARN;
+                       }
                }
 #endif
        } else if (!S_ISDIR(a->mode)) {