[PATCH] fetch2/git: Stop git from triggering fsync() calls

[Richard Purdie <richard.purdie@linuxfoundation.org>]

We only ever clone other repositories, if there were a problem such as power
failure, we'd blow away data and rebuild. As such we don't need fsync(). With
filesystems like ext*, the fsync pushes nearly all the data out to disk
which impacts all running processes.

We therefore set a configuration parameter to disable the fsync() calls.

Also fixup a case where basecmd wasn't being used for no good reason.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/bitbake/lib/bb/fetch2/git.py b/bitbake/lib/bb/fetch2/git.py
index ecaaaf9..7c0c95c 100644
--- a/bitbake/lib/bb/fetch2/git.py
+++ b/bitbake/lib/bb/fetch2/git.py
@@ -124,7 +124,7 @@ class Git(FetchMethod):
             ud.branches[name] = branch
             ud.unresolvedrev[name] = branch
 
-        ud.basecmd = data.getVar("FETCHCMD_git", d, True) or "git"
+        ud.basecmd = data.getVar("FETCHCMD_git", d, True) or "git -c core.fsyncobjectfiles=0"
 
         ud.write_tarballs = ((data.getVar("BB_GENERATE_MIRROR_TARBALLS", d, True) or "0") != "0") or ud.rebaseable
 
@@ -276,7 +276,7 @@ class Git(FetchMethod):
             os.symlink(ud.clonedir, indirectiondir)
             clonedir = indirectiondir
 
-        runfetchcmd("git clone %s %s/ %s" % (cloneflags, clonedir, destdir), d)
+        runfetchcmd("%s clone %s %s/ %s" % (ud.basecmd, cloneflags, clonedir, destdir), d)
         if not ud.nocheckout:
             os.chdir(destdir)
             if subdir != "":