From da3efdb17bef25dedc753131462ee784d822132e Mon Sep 17 00:00:00 2001 From: Jay Soffian Date: Mon, 19 Apr 2010 18:19:18 -0400 Subject: receive-pack: detect aliased updates which can occur with symrefs When pushing to a remote repo the sending side filters out aliased updates (e.g., foo:baz bar:baz). However, it is not possible for the sender to know if two refs are aliased on the receiving side via symrefs. Here is one such scenario: $ git init origin $ (cd origin && touch file && git add file && git commit -a -m intial) $ git clone --bare origin origin.git $ rm -rf origin $ git clone origin.git client $ git clone --mirror client backup.git && $ (cd backup.git && git remote set-head origin --auto) $ (cd client && git remote add --mirror backup ../backup.git && echo change1 > file && git commit -a -m change1 && git push origin && git push backup ) The push to backup fails with: Counting objects: 5, done. Writing objects: 100% (3/3), 244 bytes, done. Total 3 (delta 0), reused 0 (delta 0) Unpacking objects: 100% (3/3), done. error: Ref refs/remotes/origin/master is at ef3... but expected 262... remote: error: failed to lock refs/remotes/origin/master To ../backup.git 262cd57..ef307ff master -> master 262cd57..ef307ff origin/HEAD -> origin/HEAD ! [remote rejected] origin/master -> origin/master (failed to lock) error: failed to push some refs to '../backup.git' The reason is that refs/remotes/origin/HEAD is a symref to refs/remotes/origin/master, but it is not possible for the sending side to unambiguously know this. This commit fixes the issue by having receive-pack ignore any update to a symref whose target is being identically updated. If a symref and its target are being updated inconsistently, then the update for both fails with an error message ("refusing inconsistent update...") to help diagnose the situation. Signed-off-by: Jay Soffian Signed-off-by: Junio C Hamano --- t/t5516-fetch-push.sh | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) (limited to 't') diff --git a/t/t5516-fetch-push.sh b/t/t5516-fetch-push.sh index 0f04b2e89..0f98332d5 100755 --- a/t/t5516-fetch-push.sh +++ b/t/t5516-fetch-push.sh @@ -660,4 +660,53 @@ test_expect_success 'push with branches containing #' ' git checkout master ' +test_expect_success 'push into aliased refs (consistent)' ' + mk_test heads/master && + mk_child child1 && + mk_child child2 && + ( + cd child1 && + git branch foo && + git symbolic-ref refs/heads/bar refs/heads/foo + git config receive.denyCurrentBranch false + ) && + ( + cd child2 && + >path2 && + git add path2 && + test_tick && + git commit -a -m child2 && + git branch foo && + git branch bar && + git push ../child1 foo bar + ) +' + +test_expect_success 'push into aliased refs (inconsistent)' ' + mk_test heads/master && + mk_child child1 && + mk_child child2 && + ( + cd child1 && + git branch foo && + git symbolic-ref refs/heads/bar refs/heads/foo + git config receive.denyCurrentBranch false + ) && + ( + cd child2 && + >path2 && + git add path2 && + test_tick && + git commit -a -m child2 && + git branch foo && + >path3 && + git add path3 && + test_tick && + git commit -a -m child2 && + git branch bar && + test_must_fail git push ../child1 foo bar 2>stderr && + grep "refusing inconsistent update" stderr + ) +' + test_done -- cgit v1.2.1