1 files changed, 39 insertions, 6 deletions
diff --git a/meta/lib/oe/path.py b/meta/lib/oe/path.py
index fa209b9795..c8d8ad05b9 100644
--- a/meta/lib/oe/path.py
+++ b/meta/lib/oe/path.py
@@ -99,7 +99,22 @@ def copyhardlinktree(src, dst):
     if os.path.isdir(src) and not len(os.listdir(src)):
         return
 
-    if (os.stat(src).st_dev ==  os.stat(dst).st_dev):
+    canhard = False
+    testfile = None
+    for root, dirs, files in os.walk(src):
+        if len(files):
+            testfile = os.path.join(root, files[0])
+            break
+
+    if testfile is not None:
+        try:
+            os.link(testfile, os.path.join(dst, 'testfile'))
+            os.unlink(os.path.join(dst, 'testfile'))
+            canhard = True
+        except Exception as e:
+            bb.debug(2, "Hardlink test failed with " + str(e))
+
+    if (canhard):
         # Need to copy directories only with tar first since cp will error if two 
         # writers try and create a directory at the same time
         cmd = "cd %s; find . -type d -print | tar --xattrs --xattrs-include='*' -cf - -S -C %s -p --no-recursion --files-from - | tar --xattrs --xattrs-include='*' -xhf - -C %s" % (src, src, dst)
@@ -121,12 +136,9 @@ def copyhardlinktree(src, dst):
 def copyhardlink(src, dst):
     """Make a hard link when possible, otherwise copy."""
 
-    # We need to stat the destination directory as the destination file probably
-    # doesn't exist yet.
-    dstdir = os.path.dirname(dst)
-    if os.stat(src).st_dev == os.stat(dstdir).st_dev:
+    try:
         os.link(src, dst)
-    else:
+    except OSError:
         shutil.copy(src, dst)
 
 def remove(path, recurse=True):
@@ -308,3 +320,24 @@ def which_wild(pathname, path=None, mode=os.F_OK, *, reverse=False, candidates=F
 
     return files
 
+def canonicalize(paths, sep=','):
+    """Given a string with paths (separated by commas by default), expand
+    each path using os.path.realpath() and return the resulting paths as a
+    string (separated using the same separator a the original string).
+    """
+    # Ignore paths containing "$" as they are assumed to be unexpanded bitbake
+    # variables. Normally they would be ignored, e.g., when passing the paths
+    # through the shell they would expand to empty strings. However, when they
+    # are passed through os.path.realpath(), it will cause them to be prefixed
+    # with the absolute path to the current directory and thus not be empty
+    # anymore.
+    #
+    # Also maintain trailing slashes, as the paths may actually be used as
+    # prefixes in sting compares later on, where the slashes then are important.
+    canonical_paths = []
+    for path in (paths or '').split(sep):
+        if '$' not in path:
+            trailing_slash = path.endswith('/') and '/' or ''
+            canonical_paths.append(os.path.realpath(path) + trailing_slash)
+
+    return sep.join(canonical_paths)