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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/$MEDIA" ]; then
  echo "folder $DEST/$MEDIA does not exist."
  exit 1
fi

# Run
for folder in `ls $MEDIA`; do
  if [ -d "$DEST/$MEDIA/$folder/.git" ]; then
    # Add new remotes
    git -C $MEDIA/$folder remote -v | while read remote; do
      cd $DEST/$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 --add --push"
      else
        command="add"
      fi

      if ! git remote -v | sed -e 's/\t/ /g' | grep -q "^$name $addr $type$"; then
        # This might not sync everything in the first run as some weird behavior
        # happens according to this example:
        #
        # mkdir test && cd test
        # git init
        # git remote add origin git.example.org:test
        # git remote set-url --add --push origin test.example.org:test
        # git remote -v
        #
        # Expected output:
        #
        # origin	git.example.org:test (fetch)
        # origin	git.example.org:test (push)
        # origin	test.example.org:test (push)
        #
        # Actual output:
        #
        # origin	git.example.org:test (fetch)
        # origin	test.example.org:test (push)
        #
        # You can get the expected output by doing this additional step:
        #
        # git remote set-url --add --push origin git.example.org:test
        git remote $command $name $addr
      fi
    done

    # Delete old remotes
    git -C $DEST/$MEDIA/$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 $DEST/$MEDIA/$folder remote | grep -q "^$name$"; then
          git -C $DEST/$MEDIA/$folder remote $command $name $arg
        fi
      fi
    done
  fi
done