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fd4692ff70
When we parse "git checkout $NAME", we try to interpret
$NAME as a local branch-name. If it is, then we point HEAD
to that branch. Otherwise, we detach the HEAD at whatever
commit $NAME points to.
We do the interpretation by calling strbuf_branchname(), and
then blindly sticking "refs/heads/" on the front. This leads
to nonsense results when expansions like "@{upstream}" or
"@" point to something besides a local branch. We end up
with a local branch name like "refs/heads/origin/master" or
"refs/heads/HEAD".
Normally this has no user-visible effect because those
branches don't exist, and so we fallback to feeding the
result to get_sha1(), which resolves them correctly.
But as the new test in t3204 shows, there are corner cases
where the effect is observable, and we check out the wrong
local branch rather than detaching to the correct one.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
133 lines
3.7 KiB
Bash
Executable file
133 lines
3.7 KiB
Bash
Executable file
#!/bin/sh
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test_description='interpreting exotic branch name arguments
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Branch name arguments are usually names which are taken to be inside of
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refs/heads/, but we interpret some magic syntax like @{-1}, @{upstream}, etc.
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This script aims to check the behavior of those corner cases.
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'
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. ./test-lib.sh
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expect_branch() {
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git log -1 --format=%s "$1" >actual &&
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echo "$2" >expect &&
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test_cmp expect actual
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}
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expect_deleted() {
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test_must_fail git rev-parse --verify "$1"
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}
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test_expect_success 'set up repo' '
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test_commit one &&
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test_commit two &&
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git remote add origin foo.git
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'
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test_expect_success 'update branch via @{-1}' '
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git branch previous one &&
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git checkout previous &&
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git checkout master &&
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git branch -f @{-1} two &&
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expect_branch previous two
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'
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test_expect_success 'update branch via local @{upstream}' '
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git branch local one &&
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git branch --set-upstream-to=local &&
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git branch -f @{upstream} two &&
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expect_branch local two
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'
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test_expect_success 'disallow updating branch via remote @{upstream}' '
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git update-ref refs/remotes/origin/remote one &&
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git branch --set-upstream-to=origin/remote &&
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test_must_fail git branch -f @{upstream} two
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'
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test_expect_success 'create branch with pseudo-qualified name' '
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git branch refs/heads/qualified two &&
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expect_branch refs/heads/refs/heads/qualified two
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'
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test_expect_success 'delete branch via @{-1}' '
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git branch previous-del &&
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git checkout previous-del &&
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git checkout master &&
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git branch -D @{-1} &&
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expect_deleted previous-del
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'
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test_expect_success 'delete branch via local @{upstream}' '
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git branch local-del &&
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git branch --set-upstream-to=local-del &&
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git branch -D @{upstream} &&
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expect_deleted local-del
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'
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test_expect_success 'delete branch via remote @{upstream}' '
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git update-ref refs/remotes/origin/remote-del two &&
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git branch --set-upstream-to=origin/remote-del &&
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git branch -r -D @{upstream} &&
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expect_deleted origin/remote-del
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'
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# Note that we create two oddly named local branches here. We want to make
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# sure that we do not accidentally delete either of them, even if
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# shorten_unambiguous_ref() tweaks the name to avoid ambiguity.
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test_expect_success 'delete @{upstream} expansion matches -r option' '
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git update-ref refs/remotes/origin/remote-del two &&
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git branch --set-upstream-to=origin/remote-del &&
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git update-ref refs/heads/origin/remote-del two &&
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git update-ref refs/heads/remotes/origin/remote-del two &&
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test_must_fail git branch -D @{upstream} &&
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expect_branch refs/heads/origin/remote-del two &&
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expect_branch refs/heads/remotes/origin/remote-del two
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'
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test_expect_success 'disallow deleting remote branch via @{-1}' '
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git update-ref refs/remotes/origin/previous one &&
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git checkout -b origin/previous two &&
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git checkout master &&
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test_must_fail git branch -r -D @{-1} &&
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expect_branch refs/remotes/origin/previous one &&
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expect_branch refs/heads/origin/previous two
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'
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# The thing we are testing here is that "@" is the real branch refs/heads/@,
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# and not refs/heads/HEAD. These tests should not imply that refs/heads/@ is a
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# sane thing, but it _is_ technically allowed for now. If we disallow it, these
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# can be switched to test_must_fail.
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test_expect_success 'create branch named "@"' '
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git branch -f @ one &&
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expect_branch refs/heads/@ one
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'
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test_expect_success 'delete branch named "@"' '
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git update-ref refs/heads/@ two &&
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git branch -D @ &&
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expect_deleted refs/heads/@
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'
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test_expect_success 'checkout does not treat remote @{upstream} as a branch' '
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git update-ref refs/remotes/origin/checkout one &&
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git branch --set-upstream-to=origin/checkout &&
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git update-ref refs/heads/origin/checkout two &&
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git update-ref refs/heads/remotes/origin/checkout two &&
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git checkout @{upstream} &&
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expect_branch HEAD one
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'
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test_done
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