git-svn: several graft-branches improvements

The 'graft-branches' command can now analyze tree matches for
merge detection after commits are done, when --branch or
--branch-all-refs options are used.

We ensure that tree joins (--branch and --branch-all-refs
options) during commit time only add SVN parents that occurred
before the commit we're importing

Also fixed branch detection via merge messages, this manner of
merge detection (a la git-svnimport) is really all fuzzy, but at
least it actually works now :)

Add some new tests to go along with these fixes, too.

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

contrib/git-svn/t/t0003-graft-branches.sh

@@ -0,0 +1,63 @@
+test_description='git-svn graft-branches'
+. ./lib-git-svn.sh
+
+test_expect_success 'initialize repo' "
+	mkdir import &&
+	cd import &&
+	mkdir -p trunk branches tags &&
+	echo hello > trunk/readme &&
+	svn import -m 'import for git-svn' . $svnrepo &&
+	cd .. &&
+	svn cp -m 'tag a' $svnrepo/trunk $svnrepo/tags/a &&
+	svn cp -m 'branch a' $svnrepo/trunk $svnrepo/branches/a &&
+	svn co $svnrepo wc &&
+	cd wc &&
+	echo feedme >> branches/a/readme &&
+	svn commit -m hungry &&
+	svn up &&
+	cd trunk &&
+	svn merge -r3:4 $svnrepo/branches/a &&
+	svn commit -m 'merge with a' &&
+	cd ../.. &&
+	svn log -v $svnrepo &&
+	git-svn init -i trunk $svnrepo/trunk &&
+	git-svn init -i a $svnrepo/branches/a &&
+	git-svn init -i tags/a $svnrepo/tags/a &&
+	git-svn fetch -i tags/a &&
+	git-svn fetch -i a &&
+	git-svn fetch -i trunk
+	"
+
+r1=`git-rev-list remotes/trunk | tail -n1`
+r2=`git-rev-list remotes/tags/a | tail -n1`
+r3=`git-rev-list remotes/a | tail -n1`
+r4=`git-rev-list remotes/a | head -n1`
+r5=`git-rev-list remotes/trunk | head -n1`
+
+test_expect_success 'test graft-branches regexes and copies' "
+	test -n "$r1" &&
+	test -n "$r2" &&
+	test -n "$r3" &&
+	test -n "$r4" &&
+	test -n "$r5" &&
+	git-svn graft-branches &&
+	grep '^$r2 $r1' $GIT_DIR/info/grafts &&
+	grep '^$r3 $r1' $GIT_DIR/info/grafts &&
+	grep '^$r5 ' $GIT_DIR/info/grafts | grep '$r4' | grep '$r1'
+	"
+
+test_debug 'gitk --all & sleep 1'
+
+test_expect_success 'test graft-branches with tree-joins' "
+	rm $GIT_DIR/info/grafts &&
+	git-svn graft-branches --no-default-regex --no-graft-copy -B &&
+	grep '^$r3 ' $GIT_DIR/info/grafts | grep '$r1' | grep '$r2' &&
+	grep '^$r2 $r1' $GIT_DIR/info/grafts &&
+	grep '^$r5 ' $GIT_DIR/info/grafts | grep '$r1' | grep '$r4'
+	"
+
+# the result of this is kinda funky, we have a strange history and
+# this is just a test :)
+test_debug 'gitk --all &'
+
+test_done