bitbake: fetch/git: Fix usehead for non-default names

The usehead url parameter for git repositories causes bitbake to use
whatever commit the repository HEAD is pointing to if the repository
happens to have the name 'default'. This is the default name so in many
cases it works just fine, but if a different name is specified with the
url parameter 'name=newName' then it will fail to parse the recipe with
an error along the lines of:

ERROR: ExpansionError during parsing /path/to/my/recipe.bb
Traceback (most recent call last):
  File "/path/to/poky/bitbake/lib/bb/fetch2/git.py", line 235, in Git.urldata_init:
    >        ud.setup_revisions(d)
  File "/path/to/poky/bitbake/lib/bb/fetch2/__init__.py", line 1302, in FetchData.setup_revisions:
             for name in self.names:
    >            self.revisions[name] = srcrev_internal_helper(self, d, name)
  File "/path/to/poky/bitbake/lib/bb/fetch2/__init__.py", line 1167, in srcrev_internal_helper(name='newName'):
         if srcrev == "AUTOINC":
    >        srcrev = ud.method.latest_revision(ud, d, name)
  File "/path/to/poky/bitbake/lib/bb/fetch2/__init__.py", line 1562, in Git.latest_revision(name='newName'):
             except KeyError:
    >            revs[key] = rev = self._latest_revision(ud, d, name)
                 return rev
  File "/path/to/poky/bitbake/lib/bb/fetch2/git.py", line 650, in Git._latest_revision(name='newName'):
             raise bb.fetch2.FetchError("Unable to resolve '%s' in upstream git repository in git ls-remote output for %s" % \
    >            (ud.unresolvedrev[name], ud.host+ud.path))
bb.data_smart.ExpansionError: Failure expanding variable SRCPV, expression was ${@bb.fetch2.get_srcrev(d)} which triggered exception FetchError: Fetcher failure: Unable to resolve 'master' in upstream git repository in git ls-remote output for /path/to/local/git/repo

Let's fix this by setting the unresolved rev of _all_ repository names
to 'HEAD' when the usehead url parameter is specified. Update the
currently failing test, test_local_gitfetch_usehead_withname, to now
expect success.

This change preserves existing behavior that allows usehead to be
overridden by a valid looking revision if one happens to be specified
instead of AUTOREV.

(Bitbake rev: a247f56df680382d62910bb9a174e0fdd29e4ca8)

Signed-off-by: Joey Degges <jdegges@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 01e901c44ab0f496606b1d45c8953dc54970204c)
Signed-off-by: Paulo Neves <ptsneves@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/git.py

@@ -224,7 +224,12 @@ class Git(FetchMethod):
             ud.shallow = False
 
         if ud.usehead:
-            ud.unresolvedrev['default'] = 'HEAD'
+            # When usehead is set let's associate 'HEAD' with the unresolved
+            # rev of this repository. This will get resolved into a revision
+            # later. If an actual revision happens to have also been provided
+            # then this setting will be overridden.
+            for name in ud.names:
+                ud.unresolvedrev[name] = 'HEAD'
 
         ud.basecmd = d.getVar("FETCHCMD_git") or "git -c core.fsyncobjectfiles=0"
 

bitbake/lib/bb/tests/fetch.py

@@ -650,6 +650,58 @@ class FetcherLocalTest(FetcherTest):
         with self.assertRaises(bb.fetch2.UnpackError):
             self.fetchUnpack(['file://a;subdir=/bin/sh'])
 
+    def test_local_gitfetch_usehead(self):
+        # Create dummy local Git repo
+        src_dir = tempfile.mkdtemp(dir=self.tempdir,
+                                   prefix='gitfetch_localusehead_')
+        src_dir = os.path.abspath(src_dir)
+        bb.process.run("git init", cwd=src_dir)
+        bb.process.run("git commit --allow-empty -m'Dummy commit'",
+                       cwd=src_dir)
+        # Use other branch than master
+        bb.process.run("git checkout -b my-devel", cwd=src_dir)
+        bb.process.run("git commit --allow-empty -m'Dummy commit 2'",
+                       cwd=src_dir)
+        stdout = bb.process.run("git rev-parse HEAD", cwd=src_dir)
+        orig_rev = stdout[0].strip()
+
+        # Fetch and check revision
+        self.d.setVar("SRCREV", "AUTOINC")
+        url = "git://" + src_dir + ";protocol=file;usehead=1"
+        fetcher = bb.fetch.Fetch([url], self.d)
+        fetcher.download()
+        fetcher.unpack(self.unpackdir)
+        stdout = bb.process.run("git rev-parse HEAD",
+                                cwd=os.path.join(self.unpackdir, 'git'))
+        unpack_rev = stdout[0].strip()
+        self.assertEqual(orig_rev, unpack_rev)
+
+    def test_local_gitfetch_usehead_withname(self):
+        # Create dummy local Git repo
+        src_dir = tempfile.mkdtemp(dir=self.tempdir,
+                                   prefix='gitfetch_localusehead_')
+        src_dir = os.path.abspath(src_dir)
+        bb.process.run("git init", cwd=src_dir)
+        bb.process.run("git commit --allow-empty -m'Dummy commit'",
+                       cwd=src_dir)
+        # Use other branch than master
+        bb.process.run("git checkout -b my-devel", cwd=src_dir)
+        bb.process.run("git commit --allow-empty -m'Dummy commit 2'",
+                       cwd=src_dir)
+        stdout = bb.process.run("git rev-parse HEAD", cwd=src_dir)
+        orig_rev = stdout[0].strip()
+
+        # Fetch and check revision
+        self.d.setVar("SRCREV", "AUTOINC")
+        url = "git://" + src_dir + ";protocol=file;usehead=1;name=newName"
+        fetcher = bb.fetch.Fetch([url], self.d)
+        fetcher.download()
+        fetcher.unpack(self.unpackdir)
+        stdout = bb.process.run("git rev-parse HEAD",
+                                cwd=os.path.join(self.unpackdir, 'git'))
+        unpack_rev = stdout[0].strip()
+        self.assertEqual(orig_rev, unpack_rev)
+
 class FetcherNoNetworkTest(FetcherTest):
     def setUp(self):
         super().setUp()