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git/t/t9163-git-svn-reset-clears-caches.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) 2012 Peter Baumann
#
test_description='git svn reset clears memoized caches'
. ./lib-git-svn.sh
svn_ver="$(svn --version --quiet)"
case $svn_ver in
0.* | 1.[0-4].*)
skip_all="skipping git-svn test - SVN too old ($svn_ver)"
test_done
;;
esac
# ... a - b - m <- trunk
# \ /
# ... c <- branch1
#
# SVN Commits not interesting for this test are abbreviated with "..."
#
test_expect_success 'initialize source svn repo' '
svn_cmd mkdir -m "create trunk" "$svnrepo"/trunk &&
svn_cmd mkdir -m "create branches" "$svnrepo/branches" &&
svn_cmd co "$svnrepo"/trunk "$SVN_TREE" &&
(
cd "$SVN_TREE" &&
touch foo &&
svn_cmd add foo &&
svn_cmd commit -m "a" &&
svn_cmd cp -m branch "$svnrepo"/trunk "$svnrepo"/branches/branch1 &&
svn_cmd switch "$svnrepo"/branches/branch1 &&
touch bar &&
svn_cmd add bar &&
svn_cmd commit -m b &&
svn_cmd switch "$svnrepo"/trunk &&
touch baz &&
svn_cmd add baz &&
svn_cmd commit -m c &&
svn_cmd up &&
svn_cmd merge "$svnrepo"/branches/branch1 &&
svn_cmd commit -m "m"
) &&
rm -rf "$SVN_TREE"
'
test_expect_success 'fetch to merge-base (a)' '
git svn init -s "$svnrepo" &&
git svn fetch --revision BASE:3
'
# git svn rebase looses the merge commit
#
# ... a - b - m <- trunk
# \
# ... c
#
test_expect_success 'rebase looses SVN merge (m)' '
git svn rebase &&
git svn fetch &&
test 1 = $(git cat-file -p master|grep parent|wc -l)
'
# git svn fetch creates correct history with merge commit
#
# ... a - b - m <- trunk
# \ /
# ... c <- branch1
#
test_expect_success 'reset and fetch gets the SVN merge (m) correctly' '
git svn reset -r 3 &&
git reset --hard origin/trunk &&
git svn fetch &&
test 2 = $(git cat-file -p origin/trunk|grep parent|wc -l)
'
test_done