classes/buildcfg: Move git/layer revision code into new OE module buildcfg

There is a load of duplicated git/layer/revision code which makes
most sesne as a python library, not bbclass code. Start to refactor as such.

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

1 files changed, 40 insertions, 0 deletions

diff --git a/meta/lib/oe/buildcfg.py b/meta/lib/oe/buildcfg.py
new file mode 100644
index 0000000000..a749fc5303
--- /dev/null
+++ b/meta/lib/oe/buildcfg.py
@@ -0,0 +1,40 @@
+
+import subprocess
+import bb.process
+
+def detect_revision(d):
+    path = get_scmbasepath(d)
+    return get_metadata_git_revision(path, d)
+
+def detect_branch(d):
+    path = get_scmbasepath(d)
+    return get_metadata_git_branch(path, d)
+
+def get_scmbasepath(d):
+    return os.path.join(d.getVar('COREBASE'), 'meta')
+
+def get_metadata_svn_revision(path, d):
+    # This only works with older subversion. For newer versions 
+    # this function will need to be fixed by someone interested
+    revision = "<unknown>"
+    try:
+        with open("%s/.svn/entries" % path) as f:
+            revision = f.readlines()[3].strip()
+    except (IOError, IndexError):
+        pass
+    return revision
+
+def get_metadata_git_branch(path, d):
+    try:
+        rev, _ = bb.process.run('git rev-parse --abbrev-ref HEAD', cwd=path)
+    except bb.process.ExecutionError:
+        rev = '<unknown>'
+    return rev.strip()
+
+def get_metadata_git_revision(path, d):
+    try:
+        rev, _ = bb.process.run('git rev-parse HEAD', cwd=path)
+    except bb.process.ExecutionError:
+        rev = '<unknown>'
+    return rev.strip()
+