devtool: fix broken clones of git recipes

Because we move the workdir when extracting source, then move the source
and delete the temporary workdir, you lose the indirection symlink
pointed to by the alternates file (which is created when the fetcher
clones it from DL_DIR with -s) and the resulting repository is broken.
In any case, for a source repo that the user may put their own changes
into, we can't really rely on a clone made with -s in case the
original goes away - because of cleanall, DL_DIR disappearing, etc. So
repack the repository so that it is a complete, non-shared clone after
unpacking.

(While I'm at it, add a test for devtool modify with a git recipe which
verifies that this works.)

(From OE-Core rev: dccdde4321c48a571677995a4e1dfc583e899cbe)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/devtool/standard.py

@@ -202,6 +202,13 @@ def _extract_source(srctree, keep_temp, devbranch, d):
             # Handle if S is set to a subdirectory of the source
             srcsubdir = os.path.join(workdir, os.path.relpath(srcsubdir, workdir).split(os.sep)[0])
 
+        if os.path.exists(os.path.join(srcsubdir, '.git')):
+            alternatesfile = os.path.join(srcsubdir, '.git', 'objects', 'info', 'alternates')
+            if os.path.exists(alternatesfile):
+                # This will have been cloned with -s, so we need to convert it to a full clone
+                bb.process.run('git repack -a', cwd=srcsubdir)
+                os.remove(alternatesfile)
+
         patchdir = os.path.join(srcsubdir, 'patches')
         haspatches = False
         if os.path.exists(patchdir):