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git/t/t9114-git-svn-dcommit-merge.sh
Johan Herland fe191fcaa5 Git 2.0: git svn: Set default --prefix='origin/' if --prefix is not given
git-svn by default puts its Subversion-tracking refs directly in
refs/remotes/*. This runs counter to Git's convention of using
refs/remotes/$remote/* for storing remote-tracking branches.

Furthermore, combining git-svn with regular git remotes run the risk of
clobbering refs under refs/remotes (e.g. if you have a git remote
called "tags" with a "v1" branch, it will overlap with the git-svn's
tracking branch for the "v1" tag from Subversion.

Even though the git-svn refs stored in refs/remotes/* are not "proper"
remote-tracking branches (since they are not covered by a proper git
remote's refspec), they clearly represent a similar concept, and would
benefit from following the same convention.

For example, if git-svn tracks Subversion branch "foo" at
refs/remotes/foo, and you create a local branch refs/heads/foo to add
some commits to be pushed back to Subversion (using "git svn dcommit),
then it is clearly unhelpful of Git to throw

  warning: refname 'foo' is ambiguous.

every time you checkout, rebase, or otherwise interact with the branch.

The existing workaround for this is to supply the --prefix=quux/ to
git svn init/clone, so that git-svn's tracking branches end up in
refs/remotes/quux/* instead of refs/remotes/*. However, encouraging
users to specify --prefix to work around a design flaw in git-svn is
suboptimal, and not a long term solution to the problem. Instead,
git-svn should default to use a non-empty prefix that saves
unsuspecting users from the inconveniences described above.

This patch will only affect newly created git-svn setups, as the
--prefix option only applies to git svn init (and git svn clone).
Existing git-svn setups will continue with their existing (lack of)
prefix. Also, if anyone somehow prefers git-svn's old layout, they
can recreate that by explicitly passing an empty prefix (--prefix "")
on the git svn init/clone command line.

The patch changes the default value for --prefix from "" to "origin/",
updates the git-svn manual page, and fixes the fallout in the git-svn
testcases.

(Note that this patch might be easier to review using the --word-diff
and --word-diff-regex=. diff options.)

[ew: squashed description of <= 1.9 behavior into manpage]

Suggested-by: Thomas Ferris Nicolaisen <tfnico@gmail.com>
Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
2014-04-19 11:30:13 +00:00

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#!/bin/sh
#
# Copyright (c) 2007 Eric Wong
# Based on a script by Joakim Tjernlund <joakim.tjernlund@transmode.se>
test_description='git svn dcommit handles merges'
. ./lib-git-svn.sh
big_text_block () {
cat << EOF
#
# (C) Copyright 2000 - 2005
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# See file CREDITS for list of people who contributed to this
# project.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of
# the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
#
EOF
}
test_expect_success 'setup svn repository' '
svn_cmd co "$svnrepo" mysvnwork &&
mkdir -p mysvnwork/trunk &&
(
cd mysvnwork &&
big_text_block >>trunk/README &&
svn_cmd add trunk &&
svn_cmd ci -m "first commit" trunk
)
'
test_expect_success 'setup git mirror and merge' '
git svn init "$svnrepo" -t tags -T trunk -b branches &&
git svn fetch &&
git checkout -b svn remotes/origin/trunk &&
git checkout -b merge &&
echo new file > new_file &&
git add new_file &&
git commit -a -m "New file" &&
echo hello >> README &&
git commit -a -m "hello" &&
echo add some stuff >> new_file &&
git commit -a -m "add some stuff" &&
git checkout svn &&
mv -f README tmp &&
echo friend > README &&
cat tmp >> README &&
git commit -a -m "friend" &&
git merge merge
'
test_debug 'gitk --all & sleep 1'
test_expect_success 'verify pre-merge ancestry' "
test x\`git rev-parse --verify refs/heads/svn^2\` = \
x\`git rev-parse --verify refs/heads/merge\` &&
git cat-file commit refs/heads/svn^ | grep '^friend$'
"
test_expect_success 'git svn dcommit merges' "
git svn dcommit
"
test_debug 'gitk --all & sleep 1'
test_expect_success 'verify post-merge ancestry' "
test x\`git rev-parse --verify refs/heads/svn\` = \
x\`git rev-parse --verify refs/remotes/origin/trunk \` &&
test x\`git rev-parse --verify refs/heads/svn^2\` = \
x\`git rev-parse --verify refs/heads/merge\` &&
git cat-file commit refs/heads/svn^ | grep '^friend$'
"
test_expect_success 'verify merge commit message' "
git rev-list --pretty=raw -1 refs/heads/svn | \
grep \" Merge branch 'merge' into svn\"
"
test_done