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

DISK="$1"
VOLUME="/media/$DISK"
CACHE="/var/cache/media"
DOMAIN="`facter domain`"
MEDIA="media.$DOMAIN"
INCOMING="$CACHE/incoming"
WHOAMI="`whoami`"
OPTIONS="$*"

# Add files into the annex
function sync_media_add {
  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
}

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

# Set fsck config
if echo $OPTIONS | grep -q -- "--fsck"; then
  FSCK="true"
fi

# Set unused config
if echo $OPTIONS | grep -q -- "--dropunused"; then
  DROPUNUSED="true"
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..."
      sync_media_add
      git annex sync

      if [ "$FSCK" == "true" ]; then
        git annex fsck --fast
      fi

      if [ "$DROPUNUSED" == "true" ]; then
        git annex unused
        git annex dropunused 1-1000
      fi
      )
    fi
  done

  if [ ! -z "$DISK" ]; then
    # 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/$folder
              )
            fi
          elif [ ! -d "$VOLUME/$MEDIA/$folder" ]; then
            echo "Syncing $VOLUME/$MEDIA/$folder..."
            rsync -av --delete $CACHE/$folder/ $VOLUME/$MEDIA/$folder/
          fi
        done
      fi
    fi
  fi
fi

# Retrieve changes at media volumes
if [ ! -z "$DRIVE" ] && [ -d "$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..."
      sync_media_add
      git annex sync
      git annex get . --auto --numcopies=3

      if [ "$FSCK" == "true" ]; then
        git annex fsck --fast
      fi

      if [ "$DROPUNUSED" == "true" ]; then
        git annex unused
        git annex dropunused 1-1000
      fi

      #git annex drop --auto --numcopies=2
      )
    elif [ -d "$CACHE/$folder" ]; then
      echo "Syncing $VOLUME/$MEDIA/$folder..."
      rsync -av --delete $CACHE/$folder/ $VOLUME/$MEDIA/$folder/
    fi
  done
fi