15af58c1ad
Sometimes users are given a hash of an object and they want to
identify it further (ex.: Use verify-pack to find the largest blobs,
but what are these? or [1])
One might be tempted to extend git-describe to also work with blobs,
such that `git describe <blob-id>` gives a description as
'<commit-ish>:<path>'. This was implemented at [2]; as seen by the sheer
number of responses (>110), it turns out this is tricky to get right.
The hard part to get right is picking the correct 'commit-ish' as that
could be the commit that (re-)introduced the blob or the blob that
removed the blob; the blob could exist in different branches.
Junio hinted at a different approach of solving this problem, which this
patch implements. Teach the diff machinery another flag for restricting
the information to what is shown. For example:
$ ./git log --oneline --find-object=v2.0.0:Makefile
b2feb64309 Revert the whole "ask curl-config" topic for now
47fbfded53 i18n: only extract comments marked with "TRANSLATORS:"
we observe that the Makefile as shipped with 2.0 was appeared in
v1.9.2-471-g47fbfded53 and in v2.0.0-rc1-5-gb2feb6430b. The
reason why these commits both occur prior to v2.0.0 are evil
merges that are not found using this new mechanism.
[1] https://stackoverflow.com/questions/223678/which-commit-has-this-blob
[2] https://public-inbox.org/git/20171028004419.10139-1-sbeller@google.com/
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
69 lines
1.4 KiB
Bash
Executable File
69 lines
1.4 KiB
Bash
Executable File
#!/bin/sh
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test_description='test finding specific blobs in the revision walking'
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. ./test-lib.sh
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test_expect_success 'setup ' '
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git commit --allow-empty -m "empty initial commit" &&
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echo "Hello, world!" >greeting &&
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git add greeting &&
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git commit -m "add the greeting blob" && # borrowed from Git from the Bottom Up
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git tag -m "the blob" greeting $(git rev-parse HEAD:greeting) &&
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echo asdf >unrelated &&
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git add unrelated &&
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git commit -m "unrelated history" &&
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git revert HEAD^ &&
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git commit --allow-empty -m "another unrelated commit"
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'
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test_expect_success 'find the greeting blob' '
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cat >expect <<-EOF &&
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Revert "add the greeting blob"
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add the greeting blob
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EOF
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git log --format=%s --find-object=greeting^{blob} >actual &&
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test_cmp expect actual
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'
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test_expect_success 'setup a tree' '
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mkdir a &&
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echo asdf >a/file &&
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git add a/file &&
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git commit -m "add a file in a subdirectory"
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'
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test_expect_success 'find a tree' '
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cat >expect <<-EOF &&
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add a file in a subdirectory
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EOF
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git log --format=%s -t --find-object=HEAD:a >actual &&
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test_cmp expect actual
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'
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test_expect_success 'setup a submodule' '
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test_create_repo sub &&
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test_commit -C sub sub &&
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git submodule add ./sub sub &&
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git commit -a -m "add sub"
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'
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test_expect_success 'find a submodule' '
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cat >expect <<-EOF &&
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add sub
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EOF
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git log --format=%s --find-object=HEAD:sub >actual &&
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test_cmp expect actual
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'
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test_done
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