diff options
Diffstat (limited to 'buildstream/utils.py')
| -rw-r--r-- | buildstream/utils.py | 46 |
1 files changed, 44 insertions, 2 deletions
diff --git a/buildstream/utils.py b/buildstream/utils.py index ae5da34d7..fc496154e 100644 --- a/buildstream/utils.py +++ b/buildstream/utils.py @@ -787,6 +787,48 @@ def _ensure_real_directory(root, destpath): return destpath_resolved +@functools.lru_cache(maxsize=1) +def _symloop_max(): + if hasattr(os, 'sysconf'): + try: + ret = os.sysconf('_SC_SYMLOOP_MAX') + if ret != -1: + return ret + except ValueError: + pass + return 8 + + +@functools.lru_cache(maxsize=64) +def _sysroot_realpath(path, sysroot): + assert not os.path.isabs(path) + assert os.path.isabs(sysroot) + + loop_count = _symloop_max() + while True: + full_path = os.path.join(sysroot, path) + st = os.lstat(full_path) + mode = st.st_mode + if not stat.S_ISLNK(mode): + break + loop_count = loop_count - 1 + if loop_count < 0: + raise UtilError("Symlink loop detected: {}".format(os.path.join(sysroot, path))) + link_path = os.readlink(full_path) + if not os.path.isabs(link_path): + link_path = os.path.join('/', os.path.dirname(path), link_path) + path = os.path.relpath(os.path.normpath(link_path), '/') + + parent = os.path.dirname(path) + if parent != '': + parent = _sysroot_realpath(parent, sysroot) + full_parent = os.path.join(sysroot, parent) + if not os.path.isdir(full_parent): + raise UtilError("Path is not a directory: {}".format(full_parent)) + + return os.path.join(parent, os.path.basename(path)) + + # _process_list() # # Internal helper for copying/moving/linking file lists @@ -817,10 +859,10 @@ def _process_list(srcdir, destdir, filelist, actionfunc, result, # those directories. if not presorted: resolved = [] + _sysroot_realpath.cache_clear() for f in filelist: dirname = os.path.dirname(f) - dirname = os.path.realpath(os.path.join(srcdir, dirname)) - dirname = os.path.relpath(dirname, srcdir) + dirname = _sysroot_realpath(dirname, srcdir) if dirname == '.': resolved.append(os.path.basename(f)) else: |