fetch2/git: be more carefull in _contains_ref when checking git log output

* in some cases there could be output like this
  ERROR: ld.so: object 'libpseudo.so' from LD_PRELOAD cannot be preloaded: ignored.
  before wc -l output and returned 'output.split()[0] != 0' is always True

(Bitbake rev: 3a54dcc09a12406ec6cf22b4b1a2cc4fc203822c)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/bitbake/lib/bb/fetch2/git.py b/bitbake/lib/bb/fetch2/git.py
index 26236b81bc..4a4c30d5e4 100644
--- a/bitbake/lib/bb/fetch2/git.py
+++ b/bitbake/lib/bb/fetch2/git.py
@@ -239,7 +239,10 @@ class Git(FetchMethod):
 
     def _contains_ref(self, tag, d):
         basecmd = data.getVar("FETCHCMD_git", d, True) or "git"
-        output = runfetchcmd("%s log --pretty=oneline -n 1 %s -- 2> /dev/null | wc -l" % (basecmd, tag), d, quiet=True)
+        cmd = "%s log --pretty=oneline -n 1 %s -- 2> /dev/null | wc -l" % (basecmd, tag)
+        output = runfetchcmd(cmd, d, quiet=True)
+        if len(output.split()) > 1:
+            raise bb.fetch2.FetchError("The command '%s' gave output with more then 1 line unexpectedly, output: '%s'" % (cmd, output))
         return output.split()[0] != "0"
 
     def _revision_key(self, url, ud, d, name):