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8cd4249c4c
interpret_branch_name gets passed a "name" buffer to parse,
along with a "namelen" parameter representing its length. If
"namelen" is zero, we fallback to the NUL-terminated
string-length of "name".
However, it does not necessarily follow that if we have
gotten a non-zero "namelen", it is the NUL-terminated
string-length of "name". E.g., when get_sha1() is parsing
"foo:bar", we will be asked to operate only on the first
three characters.
Yet in interpret_branch_name and its helpers, we use string
functions like strchr() to operate on "name", looking past
the length we were given. This can result in us mis-parsing
object names. We should instead be limiting our search to
"namelen" bytes.
There are three distinct types of object names this patch
addresses:
- The intrepret_empty_at helper uses strchr to find the
next @-expression after our potential empty-at. In an
expression like "@:foo@bar", it erroneously thinks that
the second "@" is relevant, even if we were asked only
to look at the first character. This case is easy to
trigger (and we test it in this patch).
- When finding the initial @-mark for @{upstream}, we use
strchr. This means we might treat "foo:@{upstream}" as
the upstream for "foo:", even though we were asked only
to look at "foo". We cannot test this one in practice,
because it is masked by another bug (which is fixed in
the next patch).
- The interpret_nth_prior_checkout helper did not receive
the name length at all. This turns out not to be a
problem in practice, though, because its parsing is so
limited: it always starts from the far-left of the
string, and will not tolerate a colon (which is
currently the only way to get a smaller-than-strlen
"namelen"). However, it's still worth fixing to make the
code more obviously correct, and to future-proof us
against callers with more exotic buffers.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
99 lines
2.2 KiB
Bash
Executable file
99 lines
2.2 KiB
Bash
Executable file
#!/bin/sh
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test_description='test various @{X} syntax combinations together'
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. ./test-lib.sh
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check() {
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test_expect_${4:-success} "$1 = $3" "
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echo '$3' >expect &&
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if test '$2' = 'commit'
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then
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git log -1 --format=%s '$1' >actual
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elif test '$2' = 'ref'
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then
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git rev-parse --symbolic-full-name '$1' >actual
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else
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git cat-file -p '$1' >actual
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fi &&
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test_cmp expect actual
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"
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}
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nonsense() {
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test_expect_${2:-success} "$1 is nonsensical" "
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test_must_fail git rev-parse --verify '$1'
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"
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}
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fail() {
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"$@" failure
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}
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test_expect_success 'setup' '
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test_commit master-one &&
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test_commit master-two &&
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git checkout -b upstream-branch &&
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test_commit upstream-one &&
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test_commit upstream-two &&
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git checkout -b @/at-test &&
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git checkout -b @@/at-test &&
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git checkout -b @at-test &&
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git checkout -b old-branch &&
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test_commit old-one &&
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test_commit old-two &&
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git checkout -b new-branch &&
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test_commit new-one &&
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test_commit new-two &&
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git branch -u master old-branch &&
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git branch -u upstream-branch new-branch
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'
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check HEAD ref refs/heads/new-branch
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check "@{1}" commit new-one
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check "HEAD@{1}" commit new-one
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check "@{now}" commit new-two
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check "HEAD@{now}" commit new-two
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check "@{-1}" ref refs/heads/old-branch
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check "@{-1}@{0}" commit old-two
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check "@{-1}@{1}" commit old-one
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check "@{u}" ref refs/heads/upstream-branch
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check "HEAD@{u}" ref refs/heads/upstream-branch
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check "@{u}@{1}" commit upstream-one
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check "@{-1}@{u}" ref refs/heads/master
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check "@{-1}@{u}@{1}" commit master-one
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check "@" commit new-two
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check "@@{u}" ref refs/heads/upstream-branch
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check "@@/at-test" ref refs/heads/@@/at-test
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check "@/at-test" ref refs/heads/@/at-test
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check "@at-test" ref refs/heads/@at-test
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nonsense "@{u}@{-1}"
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nonsense "@{0}@{0}"
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nonsense "@{1}@{u}"
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nonsense "HEAD@{-1}"
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nonsense "@{-1}@{-1}"
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# @{N} versus HEAD@{N}
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check "HEAD@{3}" commit old-two
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nonsense "@{3}"
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test_expect_success 'switch to old-branch' '
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git checkout old-branch
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'
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check HEAD ref refs/heads/old-branch
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check "HEAD@{1}" commit new-two
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check "@{1}" commit old-one
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test_expect_success 'create path with @' '
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echo content >normal &&
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echo content >fun@ny &&
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git add normal fun@ny &&
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git commit -m "funny path"
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'
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check "@:normal" blob content
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check "@:fun@ny" blob content
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test_done
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