[PATCHv3 2/3] bitbake: fetch/git: Add latest_versionstring method

["Aníbal Limón" <anibal.limon@linux.intel.com>]

Being able to generate a version string representing the most recent git commit
given git is useful, not least for the package reporting system.

This adds in a latest_versionstring method to the git fetcher
which allows users to query the latest version using ls-remote
and filtering the responses.

The patch also adds unittests for this function so that if
improvements are made, the original test urls can be used
to evaulate the those changes.

This is based on code from Irina Patru <irina.patru@intel.com>.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
---
 lib/bb/fetch2/git.py  | 38 ++++++++++++++++++++++++++++++++++++++
 lib/bb/tests/fetch.py | 44 +++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 81 insertions(+), 1 deletion(-)

diff --git a/lib/bb/fetch2/git.py b/lib/bb/fetch2/git.py
index 799fb6c..ce647c2 100644
--- a/lib/bb/fetch2/git.py
+++ b/lib/bb/fetch2/git.py
@@ -67,6 +67,7 @@ Supported SRC_URI options are:
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
 import os
+import re
 import bb
 from   bb    import data
 from   bb.fetch2 import FetchMethod
@@ -343,6 +344,43 @@ class Git(FetchMethod):
         output = self._lsremote(ud, d, search)
         return output.split()[0]
 
+    def latest_versionstring(self, ud, d):
+        """
+        Compute the latest release name like "x.y.x" in "x.y.x+gitHASH"
+        by searching through the tags output of ls-remote, comparing
+        versions and returning the highest match.
+        """
+        verstring = ""
+        tagregex = re.compile(d.getVar('GITTAGREGEX', True) or "(?P<pver>([0-9][\.|_]?)+)")
+        try:
+            output = self._lsremote(ud, d, "refs/tags/*^{}")
+        except bb.fetch2.FetchError or bb.fetch2.NetworkAccess:
+            return ""
+
+        for line in output.split("\n"):
+            if not line:
+                break
+
+            line = line.split("/")[-1]
+            # Ignore non-released branches
+            m = re.search("(alpha|beta|rc|final)+", line)
+            if m:
+                continue
+
+            # search for version in the line
+            tag = tagregex.search(line)
+            if tag == None:
+                continue
+
+            tag = tag.group('pver')
+            tag = tag.replace("_", ".")
+
+            if verstring and bb.utils.vercmp(("0", tag, ""), ("0", verstring, "")) < 0:
+                continue
+            verstring = tag
+
+        return verstring
+
     def _build_revision(self, ud, d, name):
         return ud.revisions[name]
 
diff --git a/lib/bb/tests/fetch.py b/lib/bb/tests/fetch.py
index 7df7a0e..e0eefd3 100644
--- a/lib/bb/tests/fetch.py
+++ b/lib/bb/tests/fetch.py
@@ -24,6 +24,7 @@ import tempfile
 import subprocess
 import os
 from bb.fetch2 import URI
+from bb.fetch2 import FetchMethod
 import bb
 
 class URITest(unittest.TestCase):
@@ -558,5 +559,46 @@ class URLHandle(unittest.TestCase):
             result = bb.fetch.encodeurl(v)
             self.assertEqual(result, k)
 
+class FetchMethodTest(FetcherTest):
+
+    test_git_uris = {
+        # version pattern "X.Y.Z"
+        ("mx-1.0", "git://github.com/clutter-project/mx.git;branch=mx-1.4", "9b1db6b8060bd00b121a692f942404a24ae2960f", "")
+            : "1.99.4",
+        # version pattern "vX.Y"
+        ("mtd-utils", "git://git.infradead.org/mtd-utils.git", "ca39eb1d98e736109c64ff9c1aa2a6ecca222d8f", "")
+            : "1.5.0",
+        # version pattern "pkg_name-X.Y"
+        ("presentproto", "git://anongit.freedesktop.org/git/xorg/proto/presentproto", "24f3a56e541b0a9e6c6ee76081f441221a120ef9", "")
+            : "1.0",
+        # version pattern "pkg_name-vX.Y.Z"
+        ("dtc", "git://git.qemu.org/dtc.git", "65cc4d2748a2c2e6f27f1cf39e07a5dbabd80ebf", "")
+            : "1.4.0",
+        # combination version pattern
+        ("sysprof", "git://git.gnome.org/sysprof", "cd44ee6644c3641507fb53b8a2a69137f2971219", "")
+            : "1.2.0",
+        ("u-boot-mkimage", "git://git.denx.de/u-boot.git;branch=master;protocol=git", "62c175fbb8a0f9a926c88294ea9f7e88eb898f6c", "")
+            : "2014.01",
+        # version pattern "yyyymmdd"
+        ("mobile-broadband-provider-info", "git://git.gnome.org/mobile-broadband-provider-info", "4ed19e11c2975105b71b956440acdb25d46a347d", "")
+            : "20120614",
+        # packages with a valid GITTAGREGEX
+        ("xf86-video-omap", "git://anongit.freedesktop.org/xorg/driver/xf86-video-omap", "ae0394e687f1a77e966cf72f895da91840dffb8f", "(?P<pver>(\d+\.(\d\.?)*))")
+            : "0.4.3",
+        ("build-appliance-image", "git://git.yoctoproject.org/poky", "b37dd451a52622d5b570183a81583cc34c2ff555", "(?P<pver>(([0-9][\.|_]?)+[0-9]))")
+            : "11.0.0",
+        ("chkconfig-alternatives-native", "git://github.com/kergoth/chkconfig;branch=sysroot", "cd437ecbd8986c894442f8fce1e0061e20f04dee", "chkconfig\-(?P<pver>((\d+[\.\-_]*)+))")
+            : "1.3.59",
+        ("remake", "git://github.com/rocky/remake.git", "f05508e521987c8494c92d9c2871aec46307d51d", "(?P<pver>(\d+\.(\d+\.)*\d*(\+dbg\d+(\.\d+)*)*))")
+            : "3.82+dbg0.9",
+    }
 
-
+    def test_git_latest_versionstring(self):
+        for k, v in self.test_git_uris.items():
+            self.d.setVar("SRCREV", k[2])
+            self.d.setVar("GITTAGREGEX", k[3])
+            ud = bb.fetch2.FetchData(k[1], self.d)
+            verstring = ud.method.latest_versionstring(ud, self.d)
+            print("Package %s, version: %s <= %s" % (k[0], v, verstring))
+            r = bb.utils.vercmp_string(v, verstring)
+            self.assertTrue(r == -1 or r == 0)
-- 
1.9.1