git-commit-vandalism/t/t3200-branch.sh
Conrad Irwin 55c4a67307 Prevent force-updating of the current branch
"git branch -M <foo> <current-branch>" allows updating the current branch
which HEAD points, without the necessary house-keeping that git reset
normally does to make this operation sensible. It also leaves the reflog
in a confusing state (you would be warned when trying to read it).

"git checkout -B <current branch> <foo>" is also partly vulnerable to this
bug; due to inconsistent pre-flight checks it would perform half of its
task and then abort just before rewriting the branch. Again this
manifested itself as the index file getting out-of-sync with HEAD.

"git branch -f" already guarded against this problem, and aborts with
a fatal error.

Update "git branch -M", "git checkout -B" and "git branch -f" to share the
same check before allowing a branch to be created. These prevent you from
updating the current branch.

We considered suggesting the use of "git reset" in the failure message
but concluded that it was not possible to discern what the user was
actually trying to do.

Signed-off-by: Conrad Irwin <conrad.irwin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-22 16:00:36 -07:00

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#!/bin/sh
#
# Copyright (c) 2005 Amos Waterland
#
test_description='git branch --foo should not create bogus branch
This test runs git branch --help and checks that the argument is properly
handled. Specifically, that a bogus branch is not created.
'
. ./test-lib.sh
test_expect_success \
'prepare a trivial repository' \
'echo Hello > A &&
git update-index --add A &&
git commit -m "Initial commit." &&
echo World >> A &&
git update-index --add A &&
git commit -m "Second commit." &&
HEAD=$(git rev-parse --verify HEAD)'
test_expect_success \
'git branch --help should not have created a bogus branch' '
git branch --help </dev/null >/dev/null 2>/dev/null;
! test -f .git/refs/heads/--help
'
test_expect_success 'branch -h in broken repository' '
mkdir broken &&
(
cd broken &&
git init &&
>.git/refs/heads/master &&
test_expect_code 129 git branch -h >usage 2>&1
) &&
grep "[Uu]sage" broken/usage
'
test_expect_success \
'git branch abc should create a branch' \
'git branch abc && test -f .git/refs/heads/abc'
test_expect_success \
'git branch a/b/c should create a branch' \
'git branch a/b/c && test -f .git/refs/heads/a/b/c'
cat >expect <<EOF
$_z40 $HEAD $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150200 +0000 branch: Created from master
EOF
test_expect_success \
'git branch -l d/e/f should create a branch and a log' \
'GIT_COMMITTER_DATE="2005-05-26 23:30" \
git branch -l d/e/f &&
test -f .git/refs/heads/d/e/f &&
test -f .git/logs/refs/heads/d/e/f &&
test_cmp expect .git/logs/refs/heads/d/e/f'
test_expect_success \
'git branch -d d/e/f should delete a branch and a log' \
'git branch -d d/e/f &&
test ! -f .git/refs/heads/d/e/f &&
test ! -f .git/logs/refs/heads/d/e/f'
test_expect_success \
'git branch j/k should work after branch j has been deleted' \
'git branch j &&
git branch -d j &&
git branch j/k'
test_expect_success \
'git branch l should work after branch l/m has been deleted' \
'git branch l/m &&
git branch -d l/m &&
git branch l'
test_expect_success \
'git branch -m m m/m should work' \
'git branch -l m &&
git branch -m m m/m &&
test -f .git/logs/refs/heads/m/m'
test_expect_success \
'git branch -m n/n n should work' \
'git branch -l n/n &&
git branch -m n/n n
test -f .git/logs/refs/heads/n'
test_expect_success 'git branch -m o/o o should fail when o/p exists' '
git branch o/o &&
git branch o/p &&
test_must_fail git branch -m o/o o
'
test_expect_success 'git branch -m q r/q should fail when r exists' '
git branch q &&
git branch r &&
test_must_fail git branch -m q r/q
'
test_expect_success 'git branch -M foo bar should fail when bar is checked out' '
git branch bar &&
git checkout -b foo &&
test_must_fail git branch -M bar foo
'
test_expect_success 'git branch -M baz bam should succeed when baz is checked out' '
git checkout -b baz &&
git branch bam &&
git branch -M baz bam
'
mv .git/config .git/config-saved
test_expect_success 'git branch -m q q2 without config should succeed' '
git branch -m q q2 &&
git branch -m q2 q
'
mv .git/config-saved .git/config
git config branch.s/s.dummy Hello
test_expect_success \
'git branch -m s/s s should work when s/t is deleted' \
'git branch -l s/s &&
test -f .git/logs/refs/heads/s/s &&
git branch -l s/t &&
test -f .git/logs/refs/heads/s/t &&
git branch -d s/t &&
git branch -m s/s s &&
test -f .git/logs/refs/heads/s'
test_expect_success 'config information was renamed, too' \
"test $(git config branch.s.dummy) = Hello &&
test_must_fail git config branch.s/s/dummy"
test_expect_success 'renaming a symref is not allowed' \
'
git symbolic-ref refs/heads/master2 refs/heads/master &&
test_must_fail git branch -m master2 master3 &&
git symbolic-ref refs/heads/master2 &&
test -f .git/refs/heads/master &&
! test -f .git/refs/heads/master3
'
test_expect_success SYMLINKS \
'git branch -m u v should fail when the reflog for u is a symlink' '
git branch -l u &&
mv .git/logs/refs/heads/u real-u &&
ln -s real-u .git/logs/refs/heads/u &&
test_must_fail git branch -m u v
'
test_expect_success 'test tracking setup via --track' \
'git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --track my1 local/master &&
test $(git config branch.my1.remote) = local &&
test $(git config branch.my1.merge) = refs/heads/master'
test_expect_success 'test tracking setup (non-wildcard, matching)' \
'git config remote.local.url . &&
git config remote.local.fetch refs/heads/master:refs/remotes/local/master &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --track my4 local/master &&
test $(git config branch.my4.remote) = local &&
test $(git config branch.my4.merge) = refs/heads/master'
test_expect_success 'test tracking setup (non-wildcard, not matching)' \
'git config remote.local.url . &&
git config remote.local.fetch refs/heads/s:refs/remotes/local/s &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --track my5 local/master &&
! test "$(git config branch.my5.remote)" = local &&
! test "$(git config branch.my5.merge)" = refs/heads/master'
test_expect_success 'test tracking setup via config' \
'git config branch.autosetupmerge true &&
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch my3 local/master &&
test $(git config branch.my3.remote) = local &&
test $(git config branch.my3.merge) = refs/heads/master'
test_expect_success 'test overriding tracking setup via --no-track' \
'git config branch.autosetupmerge true &&
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --no-track my2 local/master &&
git config branch.autosetupmerge false &&
! test "$(git config branch.my2.remote)" = local &&
! test "$(git config branch.my2.merge)" = refs/heads/master'
test_expect_success 'no tracking without .fetch entries' \
'git config branch.autosetupmerge true &&
git branch my6 s &&
git config branch.automsetupmerge false &&
test -z "$(git config branch.my6.remote)" &&
test -z "$(git config branch.my6.merge)"'
test_expect_success 'test tracking setup via --track but deeper' \
'git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/o/o || git fetch local) &&
git branch --track my7 local/o/o &&
test "$(git config branch.my7.remote)" = local &&
test "$(git config branch.my7.merge)" = refs/heads/o/o'
test_expect_success 'test deleting branch deletes branch config' \
'git branch -d my7 &&
test -z "$(git config branch.my7.remote)" &&
test -z "$(git config branch.my7.merge)"'
test_expect_success 'test deleting branch without config' \
'git branch my7 s &&
sha1=$(git rev-parse my7 | cut -c 1-7) &&
echo "Deleted branch my7 (was $sha1)." >expect &&
git branch -d my7 >actual 2>&1 &&
test_i18ncmp expect actual'
test_expect_success 'test --track without .fetch entries' \
'git branch --track my8 &&
test "$(git config branch.my8.remote)" &&
test "$(git config branch.my8.merge)"'
test_expect_success \
'branch from non-branch HEAD w/autosetupmerge=always' \
'git config branch.autosetupmerge always &&
git branch my9 HEAD^ &&
git config branch.autosetupmerge false'
test_expect_success \
'branch from non-branch HEAD w/--track causes failure' \
'test_must_fail git branch --track my10 HEAD^'
test_expect_success \
'branch from tag w/--track causes failure' \
'git tag foobar &&
test_must_fail git branch --track my11 foobar'
# Keep this test last, as it changes the current branch
cat >expect <<EOF
$_z40 $HEAD $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150200 +0000 branch: Created from master
EOF
test_expect_success \
'git checkout -b g/h/i -l should create a branch and a log' \
'GIT_COMMITTER_DATE="2005-05-26 23:30" \
git checkout -b g/h/i -l master &&
test -f .git/refs/heads/g/h/i &&
test -f .git/logs/refs/heads/g/h/i &&
test_cmp expect .git/logs/refs/heads/g/h/i'
test_expect_success 'checkout -b makes reflog by default' '
git checkout master &&
git config --unset core.logAllRefUpdates &&
git checkout -b alpha &&
git rev-parse --verify alpha@{0}
'
test_expect_success 'checkout -b does not make reflog when core.logAllRefUpdates = false' '
git checkout master &&
git config core.logAllRefUpdates false &&
git checkout -b beta &&
test_must_fail git rev-parse --verify beta@{0}
'
test_expect_success 'checkout -b with -l makes reflog when core.logAllRefUpdates = false' '
git checkout master &&
git checkout -lb gamma &&
git config --unset core.logAllRefUpdates &&
git rev-parse --verify gamma@{0}
'
test_expect_success 'avoid ambiguous track' '
git config branch.autosetupmerge true &&
git config remote.ambi1.url lalala &&
git config remote.ambi1.fetch refs/heads/lalala:refs/heads/master &&
git config remote.ambi2.url lilili &&
git config remote.ambi2.fetch refs/heads/lilili:refs/heads/master &&
git branch all1 master &&
test -z "$(git config branch.all1.merge)"
'
test_expect_success 'autosetuprebase local on a tracked local branch' '
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
git config branch.autosetuprebase local &&
(git show-ref -q refs/remotes/local/o || git fetch local) &&
git branch mybase &&
git branch --track myr1 mybase &&
test "$(git config branch.myr1.remote)" = . &&
test "$(git config branch.myr1.merge)" = refs/heads/mybase &&
test "$(git config branch.myr1.rebase)" = true
'
test_expect_success 'autosetuprebase always on a tracked local branch' '
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
git config branch.autosetuprebase always &&
(git show-ref -q refs/remotes/local/o || git fetch local) &&
git branch mybase2 &&
git branch --track myr2 mybase &&
test "$(git config branch.myr2.remote)" = . &&
test "$(git config branch.myr2.merge)" = refs/heads/mybase &&
test "$(git config branch.myr2.rebase)" = true
'
test_expect_success 'autosetuprebase remote on a tracked local branch' '
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
git config branch.autosetuprebase remote &&
(git show-ref -q refs/remotes/local/o || git fetch local) &&
git branch mybase3 &&
git branch --track myr3 mybase2 &&
test "$(git config branch.myr3.remote)" = . &&
test "$(git config branch.myr3.merge)" = refs/heads/mybase2 &&
! test "$(git config branch.myr3.rebase)" = true
'
test_expect_success 'autosetuprebase never on a tracked local branch' '
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
git config branch.autosetuprebase never &&
(git show-ref -q refs/remotes/local/o || git fetch local) &&
git branch mybase4 &&
git branch --track myr4 mybase2 &&
test "$(git config branch.myr4.remote)" = . &&
test "$(git config branch.myr4.merge)" = refs/heads/mybase2 &&
! test "$(git config branch.myr4.rebase)" = true
'
test_expect_success 'autosetuprebase local on a tracked remote branch' '
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
git config branch.autosetuprebase local &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --track myr5 local/master &&
test "$(git config branch.myr5.remote)" = local &&
test "$(git config branch.myr5.merge)" = refs/heads/master &&
! test "$(git config branch.myr5.rebase)" = true
'
test_expect_success 'autosetuprebase never on a tracked remote branch' '
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
git config branch.autosetuprebase never &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --track myr6 local/master &&
test "$(git config branch.myr6.remote)" = local &&
test "$(git config branch.myr6.merge)" = refs/heads/master &&
! test "$(git config branch.myr6.rebase)" = true
'
test_expect_success 'autosetuprebase remote on a tracked remote branch' '
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
git config branch.autosetuprebase remote &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --track myr7 local/master &&
test "$(git config branch.myr7.remote)" = local &&
test "$(git config branch.myr7.merge)" = refs/heads/master &&
test "$(git config branch.myr7.rebase)" = true
'
test_expect_success 'autosetuprebase always on a tracked remote branch' '
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
git config branch.autosetuprebase remote &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --track myr8 local/master &&
test "$(git config branch.myr8.remote)" = local &&
test "$(git config branch.myr8.merge)" = refs/heads/master &&
test "$(git config branch.myr8.rebase)" = true
'
test_expect_success 'autosetuprebase unconfigured on a tracked remote branch' '
git config --unset branch.autosetuprebase &&
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --track myr9 local/master &&
test "$(git config branch.myr9.remote)" = local &&
test "$(git config branch.myr9.merge)" = refs/heads/master &&
test "z$(git config branch.myr9.rebase)" = z
'
test_expect_success 'autosetuprebase unconfigured on a tracked local branch' '
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/o || git fetch local) &&
git branch mybase10 &&
git branch --track myr10 mybase2 &&
test "$(git config branch.myr10.remote)" = . &&
test "$(git config branch.myr10.merge)" = refs/heads/mybase2 &&
test "z$(git config branch.myr10.rebase)" = z
'
test_expect_success 'autosetuprebase unconfigured on untracked local branch' '
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --no-track myr11 mybase2 &&
test "z$(git config branch.myr11.remote)" = z &&
test "z$(git config branch.myr11.merge)" = z &&
test "z$(git config branch.myr11.rebase)" = z
'
test_expect_success 'autosetuprebase unconfigured on untracked remote branch' '
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --no-track myr12 local/master &&
test "z$(git config branch.myr12.remote)" = z &&
test "z$(git config branch.myr12.merge)" = z &&
test "z$(git config branch.myr12.rebase)" = z
'
test_expect_success 'autosetuprebase never on an untracked local branch' '
git config branch.autosetuprebase never &&
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --no-track myr13 mybase2 &&
test "z$(git config branch.myr13.remote)" = z &&
test "z$(git config branch.myr13.merge)" = z &&
test "z$(git config branch.myr13.rebase)" = z
'
test_expect_success 'autosetuprebase local on an untracked local branch' '
git config branch.autosetuprebase local &&
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --no-track myr14 mybase2 &&
test "z$(git config branch.myr14.remote)" = z &&
test "z$(git config branch.myr14.merge)" = z &&
test "z$(git config branch.myr14.rebase)" = z
'
test_expect_success 'autosetuprebase remote on an untracked local branch' '
git config branch.autosetuprebase remote &&
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --no-track myr15 mybase2 &&
test "z$(git config branch.myr15.remote)" = z &&
test "z$(git config branch.myr15.merge)" = z &&
test "z$(git config branch.myr15.rebase)" = z
'
test_expect_success 'autosetuprebase always on an untracked local branch' '
git config branch.autosetuprebase always &&
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --no-track myr16 mybase2 &&
test "z$(git config branch.myr16.remote)" = z &&
test "z$(git config branch.myr16.merge)" = z &&
test "z$(git config branch.myr16.rebase)" = z
'
test_expect_success 'autosetuprebase never on an untracked remote branch' '
git config branch.autosetuprebase never &&
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --no-track myr17 local/master &&
test "z$(git config branch.myr17.remote)" = z &&
test "z$(git config branch.myr17.merge)" = z &&
test "z$(git config branch.myr17.rebase)" = z
'
test_expect_success 'autosetuprebase local on an untracked remote branch' '
git config branch.autosetuprebase local &&
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --no-track myr18 local/master &&
test "z$(git config branch.myr18.remote)" = z &&
test "z$(git config branch.myr18.merge)" = z &&
test "z$(git config branch.myr18.rebase)" = z
'
test_expect_success 'autosetuprebase remote on an untracked remote branch' '
git config branch.autosetuprebase remote &&
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --no-track myr19 local/master &&
test "z$(git config branch.myr19.remote)" = z &&
test "z$(git config branch.myr19.merge)" = z &&
test "z$(git config branch.myr19.rebase)" = z
'
test_expect_success 'autosetuprebase always on an untracked remote branch' '
git config branch.autosetuprebase always &&
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
(git show-ref -q refs/remotes/local/master || git fetch local) &&
git branch --no-track myr20 local/master &&
test "z$(git config branch.myr20.remote)" = z &&
test "z$(git config branch.myr20.merge)" = z &&
test "z$(git config branch.myr20.rebase)" = z
'
test_expect_success 'autosetuprebase always on detached HEAD' '
git config branch.autosetupmerge always &&
test_when_finished git checkout master &&
git checkout HEAD^0 &&
git branch my11 &&
test -z "$(git config branch.my11.remote)" &&
test -z "$(git config branch.my11.merge)"
'
test_expect_success 'detect misconfigured autosetuprebase (bad value)' '
git config branch.autosetuprebase garbage &&
test_must_fail git branch
'
test_expect_success 'detect misconfigured autosetuprebase (no value)' '
git config --unset branch.autosetuprebase &&
echo "[branch] autosetuprebase" >> .git/config &&
test_must_fail git branch &&
git config --unset branch.autosetuprebase
'
test_expect_success 'attempt to delete a branch without base and unmerged to HEAD' '
git checkout my9 &&
git config --unset branch.my8.merge &&
test_must_fail git branch -d my8
'
test_expect_success 'attempt to delete a branch merged to its base' '
# we are on my9 which is the initial commit; traditionally
# we would not have allowed deleting my8 that is not merged
# to my9, but it is set to track master that already has my8
git config branch.my8.merge refs/heads/master &&
git branch -d my8
'
test_expect_success 'attempt to delete a branch merged to its base' '
git checkout master &&
echo Third >>A &&
git commit -m "Third commit" A &&
git branch -t my10 my9 &&
git branch -f my10 HEAD^ &&
# we are on master which is at the third commit, and my10
# is behind us, so traditionally we would have allowed deleting
# it; but my10 is set to track my9 that is further behind.
test_must_fail git branch -d my10
'
test_done