gitpkgv.bbclass: Support also lightweight tags

When checking for commit specific tags during GITPKGVTAG resolution, use
additional '--tags' and '--exact-match' options for 'git describe'
command.

This changes the behaviour so that in case an annotated tag does not
exist for the particular commit, then the latest lightweight
(non-annotated) tag is used instead, in case that commit has at least
one such tag.

Signed-off-by: Niko Mauno <niko.mauno@vaisala.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/classes/gitpkgv.bbclass

@@ -7,8 +7,8 @@
 #   NN equals the total number of revs up to SRCREV
 #   GITHASH is SRCREV's (full) hash
 #
-# - GITPKGVTAG which is the output of 'git describe' allowing for
-#   automatic versioning
+# - GITPKGVTAG which is the output of 'git describe --tags --exact-match'
+#   allowing for automatic versioning
 #
 # gitpkgv.bbclass assumes the git repository has been cloned, and
 # contains SRCREV. So ${GITPKGV} and ${GITPKGVTAG} should never be
@@ -103,7 +103,7 @@ def get_git_pkgv(d, use_tags):
                 if use_tags:
                     try:
                         output = bb.fetch2.runfetchcmd(
-                            "git --git-dir=%(repodir)s describe %(rev)s 2>/dev/null"
+                            "git --git-dir=%(repodir)s describe %(rev)s --tags --exact-match 2>/dev/null"
                             % vars, d, quiet=True).strip()
                         ver = gitpkgv_drop_tag_prefix(output)
                     except Exception: