git_infra

commit 2811f173d0d4b8ea0a37fff4ff5db262590849c0
parent 6d1542fc17442b99f1d3a74e25863804e0fc5ae7
Author: Chris Bracken <chris@bracken.jp>
Date:   Thu, 12 Aug 2021 16:41:18 -0700

Add update_mirrors.sh

update_mirrors.sh updates all mirror repos listed in the specified
configuration file on each invocation. Configuration files take the form
of a list of repository absolute paths, one per line.

This can be installed as a cron job to keep mirrors up to date at
various frequencies. Users should avoid polling smaller git servers
frequently.

Diffstat:
A
update_mirrors.sh
 | 
59
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 59 insertions(+), 0 deletions(-)
diff --git a/update_mirrors.sh b/update_mirrors.sh
@@ -0,0 +1,59 @@
+#!/bin/sh
+# Updates git mirror repositories from upstream. This script is typically
+# installed as a cron job for for user `git` via `crontab -e`:
+#
+# minute hour    mday    month   wday    command
+# 0       *       *       *       *       ~/_git_infra/update_mirrors.sh ~/etc/mirrors_hourly.conf
+# *       0       *       *       *       ~/_git_infra/update_mirrors.sh ~/etc/mirrors_daily.conf
+# *       *       *       *       0       ~/_git_infra/update_mirrors.sh ~/etc/mirrors_weekly.conf
+#
+# The config files are formatted as one repo per line. The repos must be
+# specified as absolute paths.
+
+# Echos arguments to stderr.
+printerr() {
+  >&2 echo "$@"
+}
+
+# Prints the usage string.
+usage() {
+  printerr "usage: $0 CONFIG"
+}
+
+# Exits with failure if $1 is not an absolute path.
+verify_absolute() {
+  case "$1" in
+    /*)
+      ;;
+    *)
+      printerr "[git mirror] ERROR: must use absolute paths: $1"
+      exit 1
+      ;;
+  esac
+}
+
+# Fetches the mirrors specified in the arguments list.
+fetch_mirrors() {
+  mirrors="$*"
+  for mirror in $mirrors; do
+    verify_absolute "$mirror"
+    if [ -d "$mirror" ]; then
+      cd "$mirror"
+      printerr "[git mirror] ... $mirror"
+      git fetch
+    else
+      printerr "[git mirror] ... $mirror NOT FOUND"
+    fi
+  done
+}
+
+CONFIG="$1"
+if [ -z "${CONFIG}" ]; then
+  usage
+  exit 1
+fi
+
+printerr "[git mirror] Updating mirror repos from $CONFIG"
+if [ -f "$CONFIG" ]; then
+  fetch_mirrors "$(sort -u "$CONFIG")"
+fi