mirror of
https://github.com/git/git.git
synced 2024-11-30 13:33:44 +08:00
4a1c95931f
In c8aed5e8da (repository: stop setting SHA1 as the default object hash,
2024-05-07), we have adapted `initialize_repository()` to no longer set
up a default hash function. As this function is also used to set up
`the_repository`, the consequence is that `the_hash_algo` will now by
default be a `NULL` pointer unless the hash algorithm was configured
properly. This is done as a mechanism to detect cases where we may be
using the wrong hash function by accident.
This change now causes git-patch-id(1) to segfault when it's run outside
of a repository. As this command can read diffs from stdin, it does not
necessarily need a repository, but then relies on `the_hash_algo` to
compute the patch ID itself.
It is somewhat dubious that git-patch-id(1) relies on `the_hash_algo` in
the first place. Quoting its manpage:
A "patch ID" is nothing but a sum of SHA-1 of the file diffs
associated with a patch, with line numbers ignored. As such, it’s
"reasonably stable", but at the same time also reasonably unique,
i.e., two patches that have the same "patch ID" are almost
guaranteed to be the same thing.
We explicitly document patch IDs to be using SHA-1. Furthermore, patch
IDs are supposed to be stable for most of the part. But even with the
same input, the patch IDs will now be different depending on the repo's
configured object hash.
Work around the issue by setting up SHA-1 when there was no startup
repository for now. This is arguably not the correct fix, but for now we
rather want to focus on getting the segfault fixed.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
348 lines
8.3 KiB
Bash
Executable File
348 lines
8.3 KiB
Bash
Executable File
#!/bin/sh
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test_description='git patch-id'
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GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
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export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
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. ./test-lib.sh
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test_expect_success 'setup' '
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str="ab cd ef gh ij kl mn op" &&
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test_write_lines $str >foo &&
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test_write_lines $str >bar &&
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git add foo bar &&
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git commit -a -m initial &&
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test_write_lines $str b >foo &&
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test_write_lines $str b >bar &&
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git commit -a -m first &&
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git checkout -b same main &&
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git commit --amend -m same-msg &&
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git checkout -b notsame main &&
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echo c >foo &&
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echo c >bar &&
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git commit --amend -a -m notsame-msg &&
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git checkout -b with_space main~ &&
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cat >foo <<-\EOF &&
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a b
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c d
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e f
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g h
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i j
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k l
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m n
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op
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EOF
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cp foo bar &&
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git add foo bar &&
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git commit --amend -m "with spaces" &&
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test_write_lines bar foo >bar-then-foo &&
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test_write_lines foo bar >foo-then-bar
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'
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test_expect_success 'patch-id output is well-formed' '
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git log -p -1 >log.output &&
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git patch-id <log.output >output &&
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grep "^$OID_REGEX $(git rev-parse HEAD)$" output
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'
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#calculate patch id. Make sure output is not empty.
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calc_patch_id () {
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patch_name="$1"
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shift
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git patch-id "$@" >patch-id.output &&
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sed "s/ .*//" patch-id.output >patch-id_"$patch_name" &&
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test_line_count -eq 1 patch-id_"$patch_name"
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}
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get_top_diff () {
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git log -p -1 "$@" -O bar-then-foo --full-index --
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}
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get_patch_id () {
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get_top_diff "$1" >top-diff.output &&
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calc_patch_id <top-diff.output "$@"
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}
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test_expect_success 'patch-id detects equality' '
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get_patch_id main &&
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get_patch_id same &&
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test_cmp patch-id_main patch-id_same
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'
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test_expect_success 'patch-id detects inequality' '
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get_patch_id main &&
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get_patch_id notsame &&
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! test_cmp patch-id_main patch-id_notsame
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'
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test_expect_success 'patch-id detects equality binary' '
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cat >.gitattributes <<-\EOF &&
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foo binary
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bar binary
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EOF
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get_patch_id main &&
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get_patch_id same &&
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git log -p -1 --binary main >top-diff.output &&
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calc_patch_id <top-diff.output main_binpatch &&
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git log -p -1 --binary same >top-diff.output &&
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calc_patch_id <top-diff.output same_binpatch &&
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test_cmp patch-id_main patch-id_main_binpatch &&
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test_cmp patch-id_same patch-id_same_binpatch &&
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test_cmp patch-id_main patch-id_same &&
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test_when_finished "rm .gitattributes"
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'
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test_expect_success 'patch-id detects inequality binary' '
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cat >.gitattributes <<-\EOF &&
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foo binary
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bar binary
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EOF
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get_patch_id main &&
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get_patch_id notsame &&
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! test_cmp patch-id_main patch-id_notsame &&
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test_when_finished "rm .gitattributes"
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'
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test_expect_success 'patch-id supports git-format-patch output' '
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get_patch_id main &&
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git checkout same &&
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git format-patch -1 --stdout >format-patch.output &&
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calc_patch_id same <format-patch.output &&
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test_cmp patch-id_main patch-id_same &&
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set $(git patch-id <format-patch.output) &&
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test "$2" = $(git rev-parse HEAD)
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'
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test_expect_success 'whitespace is irrelevant in footer' '
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get_patch_id main &&
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git checkout same &&
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git format-patch -1 --stdout >format-patch.output &&
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sed "s/ \$//" format-patch.output | calc_patch_id same &&
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test_cmp patch-id_main patch-id_same
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'
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cmp_patch_id () {
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if
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test "$1" = "relevant"
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then
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! test_cmp patch-id_"$2" patch-id_"$3"
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else
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test_cmp patch-id_"$2" patch-id_"$3"
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fi
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}
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test_patch_id_file_order () {
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relevant="$1"
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shift
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name="order-${1}-$relevant"
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shift
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get_top_diff "main" >top-diff.output &&
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calc_patch_id <top-diff.output "$name" "$@" &&
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git checkout same &&
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git format-patch -1 --stdout -O foo-then-bar >format-patch.output &&
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calc_patch_id <format-patch.output "ordered-$name" "$@" &&
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cmp_patch_id $relevant "$name" "ordered-$name"
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}
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test_patch_id_whitespace () {
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relevant="$1"
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shift
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name="ws-${1}-$relevant"
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shift
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get_top_diff "main~" >top-diff.output &&
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calc_patch_id <top-diff.output "$name" "$@" &&
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get_top_diff "with_space" >top-diff.output &&
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calc_patch_id <top-diff.output "ws-$name" "$@" &&
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cmp_patch_id $relevant "$name" "ws-$name"
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}
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# combined test for options: add more tests here to make them
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# run with all options
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test_patch_id () {
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test_patch_id_file_order "$@"
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}
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# small tests with detailed diagnostic for basic options.
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test_expect_success 'file order is irrelevant with --stable' '
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test_patch_id_file_order irrelevant --stable --stable
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'
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test_expect_success 'file order is relevant with --unstable' '
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test_patch_id_file_order relevant --unstable --unstable
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'
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test_expect_success 'whitespace is relevant with --verbatim' '
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test_patch_id_whitespace relevant --verbatim --verbatim
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'
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test_expect_success 'whitespace is irrelevant without --verbatim' '
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test_patch_id_whitespace irrelevant --stable --stable
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'
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#Now test various option combinations.
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test_expect_success 'default is unstable' '
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test_patch_id relevant default
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'
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test_expect_success 'patchid.stable = true is stable' '
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test_config patchid.stable true &&
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test_patch_id irrelevant patchid.stable=true
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'
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test_expect_success 'patchid.stable = false is unstable' '
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test_config patchid.stable false &&
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test_patch_id relevant patchid.stable=false
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'
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test_expect_success 'patchid.verbatim = true is correct and stable' '
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test_config patchid.verbatim true &&
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test_patch_id_whitespace relevant patchid.verbatim=true &&
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test_patch_id irrelevant patchid.verbatim=true
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'
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test_expect_success 'patchid.verbatim = false is unstable' '
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test_config patchid.verbatim false &&
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test_patch_id relevant patchid.verbatim=false
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'
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test_expect_success '--unstable overrides patchid.stable = true' '
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test_config patchid.stable true &&
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test_patch_id relevant patchid.stable=true--unstable --unstable
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'
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test_expect_success '--stable overrides patchid.stable = false' '
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test_config patchid.stable false &&
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test_patch_id irrelevant patchid.stable=false--stable --stable
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'
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test_expect_success '--verbatim overrides patchid.stable = false' '
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test_config patchid.stable false &&
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test_patch_id_whitespace relevant stable=false--verbatim --verbatim
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'
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test_expect_success 'patch-id supports git-format-patch MIME output' '
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get_patch_id main &&
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git checkout same &&
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git format-patch -1 --attach --stdout >format-patch.output &&
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calc_patch_id <format-patch.output same &&
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test_cmp patch-id_main patch-id_same
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'
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test_expect_success 'patch-id respects config from subdir' '
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test_config patchid.stable true &&
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mkdir subdir &&
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# copy these because test_patch_id() looks for them in
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# the current directory
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cp bar-then-foo foo-then-bar subdir &&
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(
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cd subdir &&
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test_patch_id irrelevant patchid.stable=true
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)
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'
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test_expect_success 'patch-id handles no-nl-at-eof markers' '
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cat >nonl <<-\EOF &&
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diff --git i/a w/a
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index e69de29..2e65efe 100644
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--- i/a
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+++ w/a
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@@ -0,0 +1 @@
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+a
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\ No newline at end of file
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diff --git i/b w/b
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index e69de29..6178079 100644
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--- i/b
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+++ w/b
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@@ -0,0 +1 @@
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+b
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EOF
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cat >withnl <<-\EOF &&
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diff --git i/a w/a
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index e69de29..7898192 100644
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--- i/a
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+++ w/a
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@@ -0,0 +1 @@
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+a
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diff --git i/b w/b
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index e69de29..6178079 100644
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--- i/b
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+++ w/b
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@@ -0,0 +1 @@
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+b
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EOF
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calc_patch_id nonl <nonl &&
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calc_patch_id withnl <withnl &&
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test_cmp patch-id_nonl patch-id_withnl &&
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calc_patch_id nonl-inc-ws --verbatim <nonl &&
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calc_patch_id withnl-inc-ws --verbatim <withnl &&
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! test_cmp patch-id_nonl-inc-ws patch-id_withnl-inc-ws
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'
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test_expect_success 'patch-id handles diffs with one line of before/after' '
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cat >diffu1 <<-\EOF &&
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diff --git a/bar b/bar
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index bdaf90f..31051f6 100644
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--- a/bar
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+++ b/bar
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@@ -2 +2,2 @@
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b
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+c
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diff --git a/car b/car
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index 00750ed..2ae5e34 100644
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--- a/car
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+++ b/car
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@@ -1 +1,2 @@
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3
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+d
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diff --git a/foo b/foo
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index e439850..7146eb8 100644
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--- a/foo
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+++ b/foo
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@@ -2 +2,2 @@
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a
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+e
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EOF
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calc_patch_id diffu1 <diffu1 &&
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test_config patchid.stable true &&
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calc_patch_id diffu1stable <diffu1
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'
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test_expect_failure 'patch-id computes same ID with different object hashes' '
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test_when_finished "rm -rf repo-sha1 repo-sha256" &&
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cat >diff <<-\EOF &&
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diff --git a/bar b/bar
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index bdaf90f..31051f6 100644
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--- a/bar
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+++ b/bar
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@@ -2 +2,2 @@
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b
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+c
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EOF
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git init --object-format=sha1 repo-sha1 &&
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git -C repo-sha1 patch-id <diff >patch-id-sha1 &&
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git init --object-format=sha256 repo-sha256 &&
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git -C repo-sha256 patch-id <diff >patch-id-sha256 &&
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test_cmp patch-id-sha1 patch-id-sha256
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'
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test_expect_success 'patch-id without repository' '
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cat >diff <<-\EOF &&
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diff --git a/bar b/bar
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index bdaf90f..31051f6 100644
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--- a/bar
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+++ b/bar
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@@ -2 +2,2 @@
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b
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+c
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EOF
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nongit git patch-id <diff
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'
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test_done
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