Using ${GITPKGVTAG} allows for automatic versioning based on the
repository tags. For those that doesn't want to use it, ${GITPKGV} is
still available.

Signed-off-by: Otavio Salvador <ota...@ossystems.com.br>
---
 classes/gitpkgv.bbclass |   54 +++++++++++++++++++++++++++++++++++++---------
 1 files changed, 43 insertions(+), 11 deletions(-)

diff --git a/classes/gitpkgv.bbclass b/classes/gitpkgv.bbclass
index bc1dc32..ab8ba6e 100644
--- a/classes/gitpkgv.bbclass
+++ b/classes/gitpkgv.bbclass
@@ -1,12 +1,19 @@
-# gitpkgv.bbclass provides a GITPKGV variable which is a sortable version
-# with the format NN+GITHASH, to be used in PKGV, where
+# gitpkgv.bbclass provides a GITPKGV and GITPKGVTAG variables to be
+# used in PKGV, as described bellow:
 #
-# NN equals the total number of revs up to SRCREV
-# GITHASH is SRCREV's (full) hash
+# - GITPKGV which is a sortable version with the format NN+GITHASH, to
+#   be used in PKGV, where
 #
-# gitpkgv.bbclass assumes the git repository has been cloned, and contains
-# SRCREV. So ${GITPKGV} should never be used in PV, only in PKGV.
-# It can handle SRCREV = ${AUTOREV}, as well as SRCREV = "<some fixed git 
hash>"
+#   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
+#
+# gitpkgv.bbclass assumes the git repository has been cloned, and
+# contains SRCREV. So ${GITPKGV} and ${GITPKGVTAG}should never be used
+# in PV, only in PKGV.  It can handle SRCREV = ${AUTOREV}, as well as
+# SRCREV = "<some fixed git hash>"
 #
 # use example:
 #
@@ -14,10 +21,26 @@
 #
 # PV = "1.0+git${SRCPV}"
 # PKGV = "1.0+git${GITPKGV}"
+#
+# or
+#
+# inherit gitpkgv
+#
+# PV = "gitr${SRCPV}"
+# PKGV = "${GITPKGVTAG}"
 
-GITPKGV = "$...@get_git_pkgv(d)}"
 
-def get_git_pkgv(d):
+GITPKGV = "$...@get_git_pkgv(d, False)}"
+GITPKGVTAG = "$...@get_git_pkgv(d, True)}"
+
+def git_drop_tag_prefix(version):
+    import re
+    if re.match("v\d", version):
+        return version[1:]
+    else:
+        return version
+
+def get_git_pkgv(d, use_tags):
        import os
        import bb
 
@@ -33,9 +56,18 @@ def get_git_pkgv(d):
 
                        cwd = os.getcwd()
                        os.chdir(repodir)
-                       output = bb.fetch.runfetchcmd("git rev-list %s -- 2> 
/dev/null | wc -l" % rev, d, quiet=True)
+
+                       try:
+                               if not use_tags:
+                                       raise Exception("Ignoring tag values.")
+
+                               ver = 
git_drop_tag_prefix(bb.fetch.runfetchcmd("git describe %s 2>/dev/null" % rev, 
d, quiet=True).strip())
+                       except Exception:
+                               commits = bb.fetch.runfetchcmd("git rev-list %s 
-- 2> /dev/null | wc -l" % rev, d, quiet=True).strip()
+                               ver = "%s+%s" % commits, rev[:7]
+
                        os.chdir(cwd)
 
-                       return "%s+%s" % (output.split()[0], rev)
+                       return ver
 
        return "0+0"
-- 
1.7.3


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