From 1db75189d353b0f5da31575874c24170e4583b46 Mon Sep 17 00:00:00 2001
From: "Karl O. Pinc" <kop@karlpinc.com>
Date: Sun, 3 Sep 2023 11:49:55 -0500
Subject: [PATCH] Script to send email notifications of git push-s

---
 lib/git_email_hook.sh | 83 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100755 lib/git_email_hook.sh

diff --git a/lib/git_email_hook.sh b/lib/git_email_hook.sh
new file mode 100755
index 0000000..1b85ecf
--- /dev/null
+++ b/lib/git_email_hook.sh
@@ -0,0 +1,83 @@
+#!/bin/sh
+# Copyright (C) 2023 The Meme Factory, Inc.  www.karlpinc.com
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU Affero General Public License as
+#   published by the Free Software Foundation, either version 3 of the
+#   License, or (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU Affero General Public License for more details.
+#
+#   You should have received a copy of the GNU Affero General Public License
+#   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+# A git post-receive hook that sends a single email when a push is received.
+#
+# Emails are sent to the address: git-push-email-recipients-$REPO_PATH
+# $REPO_PATH is the canonical path to the git repo where the hook is
+# installed.  (Since $REPO_PATH is fully qualifed it begins with a
+# "/".  Even though the repo is a directory, it does not end with a "/".)
+#
+# DO NOT modify the email recepient.  Instead see the SokweDB wiki's
+# Unix/Linux Administration pages for how to control who receives
+# emails.
+#
+# See `git receive-pack --help`
+#
+# Installation:
+#
+# Copy (or symlink) the executable into the .git/hooks/ (or in the case
+# of a bare repository, the hooks/ directory) and give it the
+# name: post-receive
+#
+# Karl O. Pinc <kop@karlpinc.com>
+
+# Emails line break at 78 chars (IIRC)
+STAT_WIDTH=77
+
+REPO_PATH="$(git rev-parse --absolute-git-dir)"
+EMAIL_RECIPIENTS="git-push-email-recipients-${REPO_PATH}"
+
+SUBJECT="Git push report from the repository at $(hostname):${REPO_PATH}"
+
+breakline=''
+while read oval nval ref ; do
+    printf "${breakline}"
+
+    rev_type="$(git cat-file -t ${nval} 2>/dev/null)"
+    if expr "$oval" : '^0*$' >/dev/null ; then
+        # All zeros means some sort of creation operation
+        rev_range="${nval}"
+        # (At the time of this writing diffs don't work when pushing
+        # the first branch into a repo, so turn off stats in the log
+        # display.)
+        do_stat='n'
+        stat_args='--name-only'
+    else
+        rev_range="${oval}..${nval}"
+        do_stat='y'
+        stat_args="--stat-width=${STAT_WIDTH} --compact-summary"
+    fi
+
+    if [ "${rev_type}" = 'commit' ] ; then
+        git log --decorate=full ${stat_args} "${rev_range}"
+
+        if [ "${do_stat}" = 'y' ] ; then
+            printf '\n````````````````````````````````````````````````````\n'
+            printf '\nSummary of changes to the branch: %s\n' \
+                   "$(basename ${ref})"
+            git diff --stat=${STAT_WIDTH} "${rev_range}"
+        else
+            printf '\n\nNo summary statistics available.\n'
+        fi
+    else
+        printf 'Information on the push of a %s:\n\n' "${rev_type}"
+        git log --decorate=full --name-only --max-count=1 ${nval}
+    fi
+
+    breakline='\n====================================================\n'
+done \
+  | mail -s "$SUBJECT" "$EMAIL_RECIPIENTS"
-- 
2.34.1