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#!/bin/bash
#
# Keep git remotes in sync among media archives.
#

# Parameters
BASENAME="$0"
DEST="$1"
MEDIA="/var/cache/media"

# Syntax
if [ -z "$DEST" ]; then
  echo "usage: $BASENAME <dest>"
  exit 1
elif [ ! -d "$DEST" ]; then
  echo "folder $DEST does not exist."
  exit 1
fi

# Run
for folder in `ls $MEDIA`; do
  if [ -d "$DEST/$folder/.git" ]; then
    # Add new remotes
    git -C $MEDIA/$folder remote -v | while read remote; do
      cd $DEST/$folder
      name="`echo $remote | cut -d ' ' -f 1`"
      addr="`echo $remote | cut -d ' ' -f 2`"
      type="`echo $remote | cut -d ' ' -f 3`"

      if ! git remote -v | sed -e 's/\t/ /g' | grep -q "^$name $addr $type$"; then
        # Check if was not already added by a previous command
        if ! git remote | grep -q "^$name$"; then
          git remote add $name $addr
        fi

        # This might not sync everything in the first run due to unreliable "git remote -v" output.
        # See https://github.com/git/git-scm.com/issues/886
        #if [ "$type" == "(push)" ]; then
        #  git remote set-url --add --push $name $addr
        #fi
        git remote set-url --add --push $name $addr
      fi
    done

    # Delete old remotes
    git -C $DEST/$folder remote -v | while read remote; do
      cd $MEDIA/$folder
      name="`echo $remote | cut -d ' ' -f 1`"
      addr="`echo $remote | cut -d ' ' -f 2`"
      type="`echo $remote | cut -d ' ' -f 3`"

      if [ "$type" == "(push)" ]; then
        command="set-url --delete"
        arg="$addr"
      else
        command="remove"
        arg=""
      fi

      if ! git remote -v | sed -e 's/\t/ /g' | grep -q "^$name $addr $type$"; then
        # Check if was not already removed by a previous command
        if git -C $DEST/$folder remote | grep -q "^$name$"; then
          git -C $DEST/$folder remote $command $name $arg
        fi
      fi
    done
  fi
done