Scriptify patching local gitconfig

script/update_gitconfig.sh

@@ -0,0 +1,73 @@
+#!/bin/bash
+#
+# Quick script for patching the local gitconfig with the changes from git.
+#
+# Environment Variables:
+#   FORCE_PATCH: Set to 'true' to not prompt before changing. Default is false
+#
+# Exit codes:
+#    0  No error
+#    1  When exiting from help
+#
+
+set -e
+set -u
+
+
+if [[ "${1:-}" == '-h' ]]; then
+    echo "Patches the local gitconfig with the changes made to" >&2
+    echo "gitconfig in version control. Will prompt first unless" >&2
+    echo "the environment variable FORCE_PATCH is 'true'" >&2
+    exit 1
+fi
+
+
+# -- script constants --
+# set script_dir to location this script is running in
+readonly script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+
+# -- logging functions --
+# Usage: log "What to log"
+log () {
+    # logger will output to syslog, useful for background tasks
+    #logger -s -t "${script_name}" -- "$*"
+    # printf is good for scripts run manually when needed
+    printf "%b\n" "$(date +"%Y-%m-%dT%H:%M:%S%z") $*"
+}
+
+
+# This assumes this script is located in script subfolder of repo
+cd "${script_dir}/.."
+
+# Turning off exit on error as diff exits non zero if changes are made
+set +e
+diff -u -B <(grep -vE '^\s*(signingkey|email)' gitconfig) \
+    <(grep -vE '^\s*(signingkey|email)' gitconfig.versioned)
+declare -i retcode=$?
+set -e
+
+if [[ $retcode -eq 0 ]]; then
+    log "no changes are needed"
+    exit 0
+fi
+
+echo
+log "The above changes will be made to your local gitconfig."
+if [[ "${FORCE_PATCH:-false}" != 'false' ]]; then
+    log "FORCE_PATCH is set, continue"
+else
+    log "Press ctrl-c if you do not wish to make these changes."
+    log "Otherwise press enter to continue"
+    echo
+    read -n 1 -p "Continue?" __unused
+fi
+
+diff -u -B <(grep -vE '^\s*(signingkey|email)' gitconfig) \
+    <(grep -vE '^\s*(signingkey|email)' gitconfig.versioned) \
+    | patch --no-backup-if-mismatch -p2 gitconfig
+
+log "Change finished successfully"
+
+exit 0
+