Commit 939dc9a5 authored by Ben Boeckel's avatar Ben Boeckel
Browse files

Help: prefer commit hashes in commit references

The logic is that the describe output is readily available using `git
tag --contains` locally. In addition, for a hypothetical commit which
landed in both v3.9.4 and v3.10.1, there is no "better" tag to refer to.
since v3.10.0's relation to such a commit is unclear either way.

Also mention that a `Fixes` trailer is preferred if the mention is just
to indicate a commit which introduced an error rather than writing a
complete sentence about it.
parent 378473f9
......@@ -238,12 +238,10 @@ Referencing Commits in Commit Messages
The preferred form for references to other commits is
``commit <commit> (<subject>, <date>)``, where:
``commit <shorthash> (<subject>, <date>)``, where:
* ``<commit>``:
If available, a tag-relative name of the commit produced by
``git describe --contains <commit-ish>``. Otherwise, the first
8-10 characters of the commit ``<hash>``.
* ``<shorthash>``:
The abbreviated hash of the commit.
* ``<subject>``:
The first line of the commit message.
......@@ -252,6 +250,17 @@ The preferred form for references to other commits is
The author date of the commit, in its original time zone, formatted as
``CCYY-MM-DD``. ``git-log(1)`` shows the original time zone by default.
This may be generated with
``git show -s --date=short --pretty="format:%h (%s, %ad)" <commit>``.
If the commit is a fix for the mentioned commit, consider using a ``Fixes:``
trailer in the commit message with the specified format. This trailer should
not be word-wrapped. Note that if there is also an issue for what is being
fixed, it is preferrable to link to the issue instead.
If relevant, add the first release tag of CMake containing the commit after
the ``<date>``, i.e., ``commit <shorthash> (<subject>, <date>, <tag>)``.
Alternatively, the full commit ``<hash>`` may be used.
Revising Commit Messages
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