Synology GitHub Backup Script

backup-github.sh

#!/bin/sh

[ -z "$GITHUB_TOKEN" ] && echo "error: GITHUB_TOKEN required but not set" && exit 1
[ "$#" -lt 2  ] && echo "usage: bash $0 USER|ORG PATH" && exit 1


GITHUB_USER=$1
BACKUP_DIR=$2/${GITHUB_USER}

GITHUB_API_BASE=https://api.github.com
GITHUB_REPOS_URL=$GITHUB_API_BASE/search/repositories?q=user:$GITHUB_USER
REPOS=$(curl -u ${GITHUB_USER}:${GITHUB_TOKEN} -s "${GITHUB_REPOS_URL}" | jq -r '.items[] | "\(.name),\(.full_name),\(.private),\(.html_url)"')

clone(){
  mkdir -p $BACKUP_DIR
  
  for LINE in $REPOS
  do

      REPO_NAME=`echo ${LINE} | cut -d ',' -f1`
      REPO_FULLNAME=`echo ${LINE} | cut -d ',' -f2`
      PRIVATE=`echo ${LINE} | cut -d ',' -f3`
      REPO_URL=`echo ${LINE} | cut -d ',' -f4`

      CLONE_URL="https://"$(echo ${REPO_URL} | sed -E 's/^\s*.*:\/\//'"${GITHUB_USER}:${GITHUB_TOKEN}"'@/g')
      CLONE_PATH="${BACKUP_DIR}/${REPO_NAME}"
      TEMP_PATH=$CLONE_PATH".temp"

      git clone $CLONE_URL $TEMP_PATH
      rm -rf $CLONE_PATH
      cp -R $TEMP_PATH/ $CLONE_PATH/
      rm -rf $TEMP_PATH

  done
}
 
archive() {
  NOW=$(date '+%Y-%m-%d_%H:%M:%S')
  mkdir -p "${BACKUP_DIR}/tarballs_${NOW}"

  for LINE in $REPOS
  do

      REPO_NAME=`echo ${LINE} | cut -d ',' -f1`
      REPO_FULLNAME=`echo ${LINE} | cut -d ',' -f2`
      PRIVATE=`echo ${LINE} | cut -d ',' -f3`
      REPO_URL=`echo ${LINE} | cut -d ',' -f4`

      ARCHIVE_URL="https://api.github.com/repos/$GITHUB_USER/$REPO_NAME/tarball"
      ARCHIVE_PATH="${BACKUP_DIR}/tarballs_${NOW}/${REPO_NAME}.tar.gz"
      
      echo $ARCHIVE_PATH
      echo $ARCHIVE_URL

      curl -u ${GITHUB_USER}:${GITHUB_TOKEN} -L ${ARCHIVE_URL} -o ${ARCHIVE_PATH}

  done
  
  # Remove archives (older than 7 days)
  find $BACKUP_DIR -name "tarballs_*" -type d -mtime +7 -prune -exec rm -rf "{}" \;
}

clone
archive

Note: The bash for loop does not iterate over whitespace on MacOS for some reason, but this syntax should work with Synology DSM 6.2.4 which is a very weird stripped down flavor of linux.

Here is what I place in my Synology Task Scheduler user-defined script content box

BACKUP_DIR="/volume1/GitHub"
SCRIPT_URL="https://gist.githubusercontent.com/tomdaley92/6f505ada3f3895fb3e23b629087cb749/raw/backup-github.sh"

wget -q -O $BACKUP_DIR/backup.sh $SCRIPT_URL

export GITHUB_TOKEN=some_secret_token

bash /volume1/GitHub/backup.sh tomdaley92 $BACKUP_DIR
bash /volume1/GitHub/backup.sh Diesel-Net $BACKUP_DIR

Some people have told me this is overkill. I usually point them to something like this heh.