oe/path.py: copyhardlinktree: don't overwrite existing symlinks

Before GNU tar 1.24, only the archive creation command had the '-h'
argument to preserve and follow symlinks. After >= 1.24 via commit
14efeb9f956e38d7be (tar: --dereference consistency) the capability to
preserve symlinks was also added to the archive extraction command.

-h is default at archive creation but is not default at extraction,
meaning that it will replace symlinks with directories even if the
original filesystem directory tree and archive contains them.

Add -h to the copyhardlinktree extraction step so the build can
support symlinks in variables like ${DEPLOY_DIR_IPK/RPM/DEB}.

(From OE-Core rev: c1b73fe26540c38086e259be6eb313e0826dceed)

Signed-off-by: Ioan-Adrian Ratiu <adrian.ratiu@ni.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/path.py

@@ -98,7 +98,7 @@ def copyhardlinktree(src, dst):
     if (os.stat(src).st_dev ==  os.stat(dst).st_dev):
         # 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 - -C %s -p --no-recursion --files-from - | tar --xattrs --xattrs-include='*' -xf - -C %s" % (src, src, dst)
+        cmd = "cd %s; find . -type d -print | tar --xattrs --xattrs-include='*' -cf - -C %s -p --no-recursion --files-from - | tar --xattrs --xattrs-include='*' -xhf - -C %s" % (src, src, dst)
         subprocess.check_output(cmd, shell=True, stderr=subprocess.STDOUT)
         source = ''
         if os.path.isdir(src):