Backup all public repositories of specified user, designed to run from daily cron

backup_github.sh

#!/bin/bash

USER=$1

if [ -n "$2" ]; then
  VERBOSE=echo
else
  VERBOSE=:
fi

umask 0027
cd $(dirname $0)

curl -s https://api.github.com/users/${USER}/repos?type=owner | grep git_url | sed 's,^.* ",,; s/",$//;' | while read l; do
  if [ ! -e $(basename $l) ]; then
    $VERBOSE "Initial Backup of $l"
    git clone --quiet --mirror $l;
    echo "section=GitHub Backup" > $(basename $l)/cgitrc
    echo "Backup of $l" > $(basename $l)/description
  fi;
done

for d in *.git; do
  $VERBOSE "Update of $d"
  git --git-dir $d remote update > /dev/null;
done