#!/bin/bash
#
# sync-media assets using git-annex
#

VOLUME="/media/usb"
CACHE="/var/cache/media"
DOMAIN="`facter domain`"
MEDIA="media.$DOMAIN"
INCOMING="$CACHE/incoming"
WHOAMI="`whoami`"

# Set sudo config
if [ "$WHOAMI" != 'root' ]; then
  sudo="sudo"
fi

# Commit changes
if [ -d "$CACHE" ]; then
  # Fix cache permissions
  #echo "Fixing $CACHE permissions..."
  #$sudo find $CACHE -type f -exec chmod 644 {} \;
  #$sudo find $CACHE -type d -exec chmod 755 {} \;
  
  # Fix incoming permissions
  if [ -d "$INCOMING" ]; then
    echo "Fixing $INCOMING permissions..."
    $sudo find $INCOMING -type f -exec chmod 664 {} \;
    $sudo find $INCOMING -type d -exec chmod 775 {} \;
    $sudo chown -R $WHOAMI $INCOMING/*
  fi

  # Add and update local repositories
  for folder in `ls $CACHE`; do
    if [ -d "$CACHE/$folder/.git/annex" ]; then
      (
      cd $CACHE/$folder
      echo "Syncing $CACHE/$folder..."
      git annex add .

      # Adding hidden files and symlinks, find version
      #find -name '.*' -exec git annex add {} \;
      #find -type l -exec git add {} \;

      # Adding hidden files and symlinks, git+for version
      #for file in `git status --porcelain -u | sed -e 's/?? //'`; do
      #  if [ -h "$file" ]; then
      #    git add $file
      #  else
      #    git annex add $file
      #  fi
      #done

      # Adding hidden files and symlinks, git+while version
      git status --porcelain -u | sed -e 's/?? //' | while read file; do
        if [ -h "$file" ]; then
          git add "$file"
        else
          git annex add "$file"
        fi
      done

      git annex sync
      git annex fsck --fast
      git annex unused
      git annex dropunused 1-1000
      )
    fi
  done

  # Check storage media
  MOUNT="`mount | grep $VOLUME`"
  if [ ! -z "$MOUNT" ]; then
    DRIVE="$(basename `echo $MOUNT | awk '{ print $1 }'`)"
  fi

  if [ ! -z "$DRIVE" ]; then
    if [ ! -d "$VOLUME/$MEDIA" ]; then
      echo "Folder $VOLUME/$MEDIA does not exist..."
    else
      for folder in `ls $CACHE`; do
        if [ -d "$CACHE/$folder/.git/annex" ]; then
          if [ ! -d "$VOLUME/$MEDIA/$folder" ]; then
            (
            cd $VOLUME/$MEDIA
            echo "Initializing $VOLUME/$MEDIA/$folder..."
            git clone $CACHE/$folder && cd $folder && git annex init $DRIVE && \
              cd $CACHE/$folder && git remote add $DRIVE $VOLUME/$MEDIA/$folder
            )
          fi
        fi
      done
    fi
  fi
fi

# Retrieve changes at media volumes
if [ -d "$VOLUME/$MEDIA" ]; then
  for folder in `ls $VOLUME/$MEDIA`; do
    if [ -d "$VOLUME/$MEDIA/$folder/.git/annex" ]; then
      (
      cd $VOLUME/$MEDIA/$folder
      echo "Syncing $VOLUME/$MEDIA/$folder..."
      git annex sync
      git annex get --auto --numcopies=3
      git annex fsck --fast
      git annex unused
      git annex dropunused 1-1000
      #git annex drop --auto --numcopies=2
      )
    fi
  done
fi