bitbake: fetch/git: Replace mkdtemp with TemporaryDirectory and avoid exception masking

Due to using mkdtemp instead of TemporaryDirectory we needed to
manually cleanup the directory in a try finally block.
With tempfile.TemporaryDirectory we can handle the cleanup with
a "with" statement and not need to manually clean up oursevels.

(Bitbake rev: 36a231d2a45e7c87172196538d18ded81a234774)

Signed-off-by: Paulo Neves <paulo@myneves.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/git.py

@@ -417,8 +417,7 @@ class Git(FetchMethod):
             # It would be nice to just do this inline here by running 'git-lfs fetch'
             # on the bare clonedir, but that operation requires a working copy on some
             # releases of Git LFS.
-            tmpdir = tempfile.mkdtemp(dir=d.getVar('DL_DIR'))
-            try:
+            with tempfile.TemporaryDirectory(dir=d.getVar('DL_DIR')) as tmpdir:
                 # Do the checkout. This implicitly involves a Git LFS fetch.
                 Git.unpack(self, ud, tmpdir, d)
 
@@ -436,8 +435,6 @@ class Git(FetchMethod):
                 # downloaded.
                 if os.path.exists(os.path.join(tmpdir, "git", ".git", "lfs")):
                     runfetchcmd("tar -cf - lfs | tar -xf - -C %s" % ud.clonedir, d, workdir="%s/git/.git" % tmpdir)
-            finally:
-                bb.utils.remove(tmpdir, recurse=True)
 
     def build_mirror_data(self, ud, d):