devtool: fix devtool upgrade with reproducible_builds class

If the reproducible_build class is inherited then there may be a
"source-date-epoch" subdirectory in a fetched source tree; devtool
upgrade was not expecting that in the upgraded source. Take a small
snippet of code from recipetool create which already handles this,
and make it a shared function that can be used in both places.

Additionally, fix an assumption that the source is always in a
subdirectory in the cleanup code that blocked debugging this.

[YOCTO #13635]

(From OE-Core rev: 0d642861cd9cf034b8d4951433980addc215d4fd)

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

scripts/lib/devtool/upgrade.py

@@ -32,7 +32,7 @@ def _run(cmd, cwd=''):
 
 def _get_srctree(tmpdir):
     srctree = tmpdir
-    dirs = os.listdir(tmpdir)
+    dirs = scriptutils.filter_src_subdirs(tmpdir)
     if len(dirs) == 1:
         srctree = os.path.join(tmpdir, dirs[0])
     return srctree
@@ -281,7 +281,8 @@ def _extract_new_source(newpv, srctree, no_patch, srcrev, srcbranch, branch, kee
             logger.info('Preserving temporary directory %s' % tmpsrctree)
         else:
             shutil.rmtree(tmpsrctree)
-            shutil.rmtree(tmpdir)
+            if tmpdir != tmpsrctree:
+                shutil.rmtree(tmpdir)
 
     return (rev, md5, sha256, srcbranch, srcsubdir_rel)