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#!/bin/sh
#
# An example hook script to check the commit log message.
# Called by "git commit" with one argument, the name of the file
# that has the commit message. The hook should exit with non-zero
# status after issuing an appropriate message if it wants to stop the
# commit. The hook is allowed to edit the commit message file.
#
# To enable this hook, rename this file to "commit-msg".
# Uncomment the below to add a Signed-off-by line to the message.
# Doing this in a hook is a bad idea in general, but the prepare-commit-msg
# hook is more suited to it.
#
# SOB=$(git var GIT_AUTHOR_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
# grep -qs "^$SOB" "$1" || echo "$SOB" >> "$1"
# This example catches duplicate Signed-off-by lines and messages that
# would confuse 'git am'.
ret=0
test "" = "$(grep '^Signed-off-by: ' "$1" |
sort | uniq -c | sed -e '/^[ ]*1[ ]/d')" || {
echo >&2 Duplicate Signed-off-by lines.
ret=1
}
comment_re="$(
{
git config --get-regexp "^core\.comment(char|string)\$" ||
echo '#'
} | sed -n -e '
${
s/^[^ ]* //
s|[][*./\]|\\&|g
s/^auto$/[#;@!$%^&|:]/
p
}'
)"
scissors_line="^${comment_re} -\{8,\} >8 -\{8,\}\$"
comment_line="^${comment_re}.*"
blank_line='^[ ]*$'
# Disallow lines starting with "diff -" or "Index: " in the body of the
# message. Stop looking if we see a scissors line.
line="$(sed -n -e "
# Skip comments and blank lines at the start of the file.
/${scissors_line}/q
/${comment_line}/d
/${blank_line}/d
# The first paragraph will become the subject header so
# does not need to be checked.
: subject
n
/${scissors_line}/q
/${blank_line}/!b subject
# Check the body of the message for problematic
# prefixes.
: body
n
/${scissors_line}/q
/${comment_line}/b body
/^diff -/{p;q;}
/^Index: /{p;q;}
b body
" "$1")"
if test -n "$line"
then
echo >&2 "Message contains a diff that will confuse 'git am'."
echo >&2 "To fix this indent the diff."
ret=1
fi
exit $ret
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