#!/bin/bash

# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Mark all ebuilds in chromiumos-overlay and chromeos-overlay as stable and
# point them at the current version we have checked out.
#
# This is useful in case we want to verify that all ebuilds are pointing at the
# right commit hash when we are doing a build on a branch. It is intended to be
# used prior to tagging and can be used instead of a preflight queue. It is an
# alternative to cros_mark_all_as_stable that does not require a chroot and
# does not increase the revision number on ebuilds.
#
# Unlike cros_mark_all_as_stable, which only updates the latest stable ebuild
# for a given board, this script updates all stable ebuilds for all boards,
# including unused stable ebuilds. We do this for the sake of simplicity
# because it's hard to know in advance which ebuilds are truly unused, and it
# shouldn't hurt to update unused ebuilds.
#
# This script does not support cros_mark_as_stable_blacklist. If there are any
# packages in the blacklist, this script exits with an error message.
#
# Long term, the plan is to get rid of this script and replace it with
# cros_mark_all_as_stable. This script is only present to help with branching.
#
# Example usage: ./cros_mark_branch_as_stable

# Load common constants.  This should be the first executable line.
# The path to common.sh should be relative to your script's location.
. "$(dirname "$0")/common.sh"

function is_workon() { xargs grep -lE '^inherit.*cros-workon'; }
function is_stable() { xargs grep -lE '^KEYWORDS=[^~]*$'; }
function is_unstable() { xargs grep -lE '^KEYWORDS=.*~'; }

function get_workon_commit() {
  # Get the latest workon commit associated with an ebuild.
  ebuild="$1"
  dir=$(dirname $ebuild)
  CATEGORY=$(basename $(dirname "$dir"))
  CROS_WORKON_LOCALNAME=$(basename "$dir")
  CROS_WORKON_SUBDIR=

  # Grab the code from the ebuild that initializes the CROS_WORKON_*
  # variables, and eval it. Note that this only works if the variables are at
  # the start of the line (i.e. it doesn't work for "if" statements).
  eval $(grep -E '^CROS_WORKON' $ebuild)

  SUFFIX="$CROS_WORKON_LOCALNAME/$CROS_WORKON_SUBDIR"
  if [[ "$CATEGORY" = "chromeos-base" ]]; then
    SRCDIR="$GCLIENT_ROOT/src/platform/$SUFFIX"
  else
    SRCDIR="$GCLIENT_ROOT/src/third_party/$SUFFIX"
  fi

  # TODO(anush): This hack is only necessary because the kernel ebuild has "if"
  # statements, so we can't grab the CROS_WORKON_LOCALNAME properly. We should
  # clean up the kernel ebuild and remove this hack.
  if ! [[ -d "$SRCDIR" ]] && [[ "$CROS_WORKON_LOCALNAME" = "kernel" ]]; then
    SRCDIR="$GCLIENT_ROOT/src/third_party/kernel/files"
  fi

  cd $SRCDIR && git rev-parse HEAD
}

BLACKLIST_FILE=$(dirname "$0")/cros_mark_as_stable_blacklist
BLACKLIST=$(cat "$BLACKLIST_FILE")
if [[ -n "$BLACKLIST" ]]; then
  die "$0 does not support cros_mark_as_stable_blacklist"
fi

for overlay in "$GCLIENT_ROOT/src/private-overlays/chromeos-overlay" \
               "$GCLIENT_ROOT/src/third_party/chromiumos-overlay"; do
  if [[ -d "$overlay" ]]; then
    ebuilds=$(find "$overlay" -type f -name "*.ebuild" | is_workon | is_stable)
    for ebuild in $ebuilds; do
      dir=$(dirname "$ebuild")
      unstable_ebuild=$(echo "$dir"/*-9999.ebuild | is_workon | is_unstable)
      if [[ -f "$unstable_ebuild" ]]; then
        COMMIT=$(get_workon_commit $unstable_ebuild)
        sed -e '/^KEYWORDS="/s/~//g' -e '/^CROS_WORKON_COMMIT=/d' \
            -e "/^EAPI/s/\$/\nCROS_WORKON_COMMIT=\"$COMMIT\"/g" \
          "$unstable_ebuild" > "$ebuild"
      else
        echo "No 9999 ebuild for $ebuild" >&2
        COMMIT=$(get_workon_commit $ebuild)
        sed -i -e "/^CROS_WORKON_COMMIT/s|=.*|=\"$COMMIT\"|" "$ebuild"
      fi
      if [[ -z "$COMMIT" ]]; then
        die "No commit hash for $ebuild"
      fi
    done
  fi
done

echo Updated all ebuilds