#!/bin/sh
#
# Update the current version date in all files in the tree containing
# it.  Consider all single-component-version release branches except
# those matching the regular expression in $IGNORE_BRANCHES, and also
# consider those branches listed in the space separated list in
# $ADD_BRANCHES.

GITROOT=${GITROOT:-"/git/gcc.git"}
IGNORE_BRANCHES='releases/gcc-(.*\..*|5|6|7)'
ADD_BRANCHES='master'

# Run this from /tmp.
export GITROOT
BASEDIR=/tmp/$$
/bin/rm -rf "$BASEDIR"
/bin/mkdir "$BASEDIR"
cd "$BASEDIR"

GIT=${GIT:-/usr/local/bin/git}

# Compute the branches which we should update.
BRANCHES=`(cd $GITROOT \
	   && ${GIT} for-each-ref --format='%(refname)' \
		     'refs/heads/releases/gcc-*') \
	  | sed -e 's/refs\/heads\///' \
          | egrep -v $IGNORE_BRANCHES`
# Always update the mainline.
BRANCHES="${ADD_BRANCHES} ${BRANCHES}"

# This is put into the datestamp files.
CURR_DATE=`/bin/date +"%Y%m%d"`

datestamp_FILES="gcc/DATESTAMP"


# Assume all will go well.
RESULT=0
SUBDIR=$BASEDIR/gcc
for BRANCH in $BRANCHES; do
  echo "Working on \"$BRANCH\"."
  # Check out the files on the branch.
  if [ -d "$SUBDIR" ]; then
    cd "$SUBDIR"
    ${GIT} pull -q
    ${GIT} checkout -q "$BRANCH"
  else
    ${GIT} clone -q -b "$BRANCH" "$GITROOT" "$SUBDIR"
  fi

  # There are no files to commit yet.
  COMMIT_FILES=""

  cd "$SUBDIR"
  for file in $datestamp_FILES; do
    if test -f $file; then
      echo "${CURR_DATE}" > $file.new

      if /usr/bin/cmp -s $file $file.new; then
	rm -f $file.new
      else
	mv -f $file.new $file
        COMMIT_FILES="$COMMIT_FILES $file"
      fi
    fi
  done

  if test -n "$COMMIT_FILES"; then
    for i in $COMMIT_FILES; do
    echo "Attempting to commit $i"
    if ${GIT} commit -m "Daily bump." $i; then
      if ! ${GIT} push origin "$BRANCH"; then
        # If we could not push the files, indicate failure.
        RESULT=1
      fi
    else
      # If we could not commit the files, indicate failure.
      RESULT=1
    fi
    done
  fi
done

/bin/rm -rf $BASEDIR
exit $RESULT