sstate/path.py: Add copyhardlinktree() function and use for performance optimisation

Add a function which copys a tree as a set of hardlinks to the original
files, then use this in sstate to reduce some of the overhead of sstate
package creation since the file isn't actually copied.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/meta/lib/oe/path.py b/meta/lib/oe/path.py
index 7197b23650..ea58bedc8b 100644
--- a/meta/lib/oe/path.py
+++ b/meta/lib/oe/path.py
@@ -83,6 +83,14 @@ def copytree(src, dst):
     cmd = 'tar -cf - -C %s -ps . | tar -xf - -C %s' % (src, dst)
     check_output(cmd, shell=True, stderr=subprocess.STDOUT)
 
+def copyhardlinktree(src, dst):
+    bb.utils.mkdirhier(dst)
+    if os.path.isdir(src):
+        if not len(os.listdir(src)):
+            return	
+        src = src + "/*"
+    cmd = 'cp -al %s %s' % (src, dst)
+    check_output(cmd, shell=True, stderr=subprocess.STDOUT)
 
 def remove(path, recurse=True):
     """Equivalent to rm -f or rm -rf"""