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89 lines
2.9 KiB
Bash
Executable File
89 lines
2.9 KiB
Bash
Executable File
#!/bin/sh
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# Check the file list of GNU Emacs change log entries before pushing.
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# Copyright 2023-2024 Free Software Foundation, Inc.
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# This file is part of GNU Emacs.
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# GNU Emacs is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# GNU Emacs is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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### Commentary:
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# This hook runs before pushing a series of commits and checks that
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# the files mentioned in each commit message match the diffs. This
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# helps ensure that the resulting change logs are correct, which
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# should prevent errors when generating etc/AUTHORS.
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# These checks also happen in the "post-commit" hook (which see), but
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# that hook can't abort a commit; it just advises the committer to fix
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# the commit so that this hook runs without errors.
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### Code:
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HOOKS_DIR=`dirname "$0"`
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# Prefer gawk if available, as it handles NUL bytes properly.
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if type gawk >/dev/null 2>&1; then
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awk="gawk"
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else
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awk="awk"
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fi
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# Standard input receives lines of the form:
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# <local ref> SP <local sha> SP <remote ref> SP <remote sha> LF
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$awk -v origin_name="$1" '
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# If the local SHA is all zeroes, ignore it.
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$2 ~ /^0{40}$/ {
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next
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}
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# Check any lines with a valid local SHA and whose remote ref is
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# master or an emacs-NN release branch. (We want to avoid checking
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# feature or scratch branches here.)
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$2 ~ /^[a-z0-9]{40}$/ && $3 ~ /^refs\/heads\/(master|emacs-[0-9]+)$/ {
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newref = $2
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# If the remote SHA is all zeroes, this is a new object to be
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# pushed (likely a branch)...
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if ($4 ~ /^0{40}$/) {
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back = 0
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# ... Go backwards until we find a SHA on an origin branch.
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# Stop trying after 1000 commits, just in case...
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for (back = 0; back < 1000; back++) {
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cmd = ("git branch -r -l '\''" origin_name "/*'\''" \
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" --contains " newref "~" back)
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rv = (cmd | getline)
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close(cmd)
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if (rv > 0)
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break;
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}
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cmd = ("git rev-parse " newref "~" back)
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cmd | getline oldref
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if (!(oldref ~ /^[a-z0-9]{40}$/)) {
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# The SHA is misformatted! Skip this line.
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next
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}
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close(cmd)
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} else if ($4 ~ /^[a-z0-9]{40}$/) {
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oldref = $4
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} else {
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# The SHA is misformatted! Skip this line.
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next
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}
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# Print every SHA after oldref, up to (and including) newref.
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system("git rev-list --first-parent --reverse " oldref ".." newref)
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}
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' | $awk -v reason=pre-push -f "$HOOKS_DIR"/commit-msg-files.awk
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