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sequencer: handle unborn branch with --allow-empty
When using git-cherry-pick(1) with `--allow-empty` while on an unborn branch, an error is thrown. This is inconsistent with the same cherry-pick when `--allow-empty` is not specified. Detect unborn branches in `is_index_unchanged`. When on an unborn branch, use the `empty_tree` as the tree to compare against. Add a new test to cover this scenario. While modelled off of the existing 'cherry-pick on unborn branch' test, some improvements can be made: - Use `git switch --orphan unborn` instead of `git checkout --orphan unborn` to avoid the need for a separate `rm -rf *` call - Avoid using `--quiet` in the `git diff` call to make debugging easier in the event of a failure. Use simply `--exit-code` instead. Make these improvements to the existing test as well as the new test. Helped-by: Phillip Wood <phillip.wood@dunelm.org.uk> Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Brian Lyles <brianmlyles@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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2 changed files with 38 additions and 17 deletions
41
sequencer.c
41
sequencer.c
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@ -772,29 +772,42 @@ static struct object_id *get_cache_tree_oid(struct index_state *istate)
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static int is_index_unchanged(struct repository *r)
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{
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struct object_id head_oid, *cache_tree_oid;
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const struct object_id *head_tree_oid;
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struct commit *head_commit;
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struct index_state *istate = r->index;
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const char *head_name;
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if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, &head_oid, NULL))
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return error(_("could not resolve HEAD commit"));
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if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, &head_oid, NULL)) {
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/* Check to see if this is an unborn branch */
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head_name = resolve_ref_unsafe("HEAD",
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RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
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&head_oid, NULL);
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if (!head_name ||
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!starts_with(head_name, "refs/heads/") ||
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!is_null_oid(&head_oid))
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return error(_("could not resolve HEAD commit"));
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head_tree_oid = the_hash_algo->empty_tree;
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} else {
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head_commit = lookup_commit(r, &head_oid);
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head_commit = lookup_commit(r, &head_oid);
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/*
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* If head_commit is NULL, check_commit, called from
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* lookup_commit, would have indicated that head_commit is not
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* a commit object already. repo_parse_commit() will return failure
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* without further complaints in such a case. Otherwise, if
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* the commit is invalid, repo_parse_commit() will complain. So
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* there is nothing for us to say here. Just return failure.
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*/
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if (repo_parse_commit(r, head_commit))
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return -1;
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/*
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* If head_commit is NULL, check_commit, called from
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* lookup_commit, would have indicated that head_commit is not
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* a commit object already. repo_parse_commit() will return failure
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* without further complaints in such a case. Otherwise, if
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* the commit is invalid, repo_parse_commit() will complain. So
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* there is nothing for us to say here. Just return failure.
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*/
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if (repo_parse_commit(r, head_commit))
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return -1;
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head_tree_oid = get_commit_tree_oid(head_commit);
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}
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if (!(cache_tree_oid = get_cache_tree_oid(istate)))
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return -1;
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return oideq(cache_tree_oid, get_commit_tree_oid(head_commit));
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return oideq(cache_tree_oid, head_tree_oid);
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}
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static int write_author_script(const char *message)
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@ -104,11 +104,19 @@ test_expect_success 'revert forbidden on dirty working tree' '
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'
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test_expect_success 'cherry-pick on unborn branch' '
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git checkout --orphan unborn &&
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git switch --orphan unborn &&
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git rm --cached -r . &&
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rm -rf * &&
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git cherry-pick initial &&
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git diff --quiet initial &&
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git diff --exit-code initial &&
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test_cmp_rev ! initial HEAD
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'
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test_expect_success 'cherry-pick on unborn branch with --allow-empty' '
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git checkout --detach &&
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git branch -D unborn &&
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git switch --orphan unborn &&
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git cherry-pick initial --allow-empty &&
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git diff --exit-code initial &&
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test_cmp_rev ! initial HEAD
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'
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