| commit | 30b1c7ad9d64695a65c23f922e6ffd2fd35660da | [log] [tgz] |
|---|---|---|
| author | Benno Evers <benno@bmevers.de> | Wed Feb 26 18:48:53 2020 +0100 |
| committer | Junio C Hamano <gitster@pobox.com> | Wed Feb 26 12:14:12 2020 -0800 |
| tree | 513f58dfd862fd8198ccf6fdccfffde83db897b2 | |
| parent | 2d2118b814c11f509e1aa76cb07110f7231668dc [diff] |
describe: don't abort too early when searching tags
When searching the commit graph for tag candidates, `git-describe`
will stop as soon as there is only one active branch left and
it already found an annotated tag as a candidate.
This works well as long as all branches eventually connect back
to a common root, but if the tags are found across branches
with no common ancestor
B
o----.
\
o-----o---o----x
A
it can happen that the search on one branch terminates prematurely
because a tag was found on another, independent branch. This scenario
isn't quite as obscure as it sounds, since cloning with a limited
depth often introduces many independent "dead ends" into the commit
graph.
The help text of `git-describe` states pretty clearly that when
describing a commit D, the number appended to the emitted tag X should
correspond to the number of commits found by `git log X..D`.
Thus, this commit modifies the stopping condition to only abort
the search when only one branch is left to search *and* all current
best candidates are descendants from that branch.
For repositories with a single root, this condition is always
true: When the search is reduced to a single active branch, the
current commit must be an ancestor of *all* tag candidates. This
means that in the common case, this change will have no negative
performance impact since the same number of commits as before will
be traversed.
Signed-off-by: Benno Evers <benno@bmevers.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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