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+#!/bin/bash
+# Copyright 2011 the V8 project authors. All rights reserved.
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following
+# disclaimer in the documentation and/or other materials provided
+# with the distribution.
+# * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived
+# from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+########## Global variable definitions
+
+BRANCHNAME=prepare-push
+TRUNKBRANCH=trunk-push
+TEMP_BRANCH=v8-push-to-trunk-script-temporary-branch
+VERSION_FILE="src/version.cc"
+PERSISTFILE_BASENAME=/tmp/v8-push-to-trunk-tempfile
+CHANGELOG_ENTRY_FILE="$PERSISTFILE_BASENAME-changelog-entry"
+PATCH_FILE="$PERSISTFILE_BASENAME-patch"
+COMMITMSG_FILE="$PERSISTFILE_BASENAME-commitmsg"
+TOUCHED_FILES_FILE="$PERSISTFILE_BASENAME-touched-files"
+STEP=0
+
+
+########## Function definitions
+
+usage() {
+cat << EOF
+usage: $0 OPTIONS
+
+Performs the necessary steps for a V8 push to trunk. Only works for \
+git checkouts.
+
+OPTIONS:
+ -h Show this message
+ -s Specify the step where to start work. Default: 0.
+ -l Manually specify the git commit ID of the last push to trunk.
+EOF
+}
+
+die() {
+ [[ -n "$1" ]] && echo "Error: $1"
+ echo "Exiting."
+ exit 1
+}
+
+confirm() {
+ echo -n "$1 [Y/n] "
+ read ANSWER
+ if [[ -z "$ANSWER" || "$ANSWER" == "Y" || "$ANSWER" == "y" ]] ; then
+ return 0
+ else
+ return 1
+ fi
+}
+
+delete_branch() {
+ local MATCH=$(git branch | grep $1)
+ if [ "$MATCH" == "$1" ] ; then
+ confirm "Branch $1 exists, do you want to delete it?"
+ if [ $? -eq 0 ] ; then
+ git branch -D $1
+ echo "Branch $1 deleted."
+ else
+ die "Can't continue. Please delete branch $1 and try again."
+ fi
+ fi
+}
+
+# Persist and restore variables to support canceling/resuming execution
+# of this script.
+persist() {
+ local VARNAME=$1
+ local FILE="$PERSISTFILE_BASENAME-$VARNAME"
+ echo "${!VARNAME}" > $FILE
+}
+
+restore() {
+ local VARNAME=$1
+ local FILE="$PERSISTFILE_BASENAME-$VARNAME"
+ local VALUE="$(cat $FILE)"
+ eval "$VARNAME=\"$VALUE\""
+}
+
+restore_if_unset() {
+ local VARNAME=$1
+ [[ -z "${!VARNAME}" ]] && restore "$VARNAME"
+ [[ -z "${!VARNAME}" ]] && die "Variable '$VARNAME' could not be restored."
+}
+
+
+########## Option parsing
+
+while getopts ":hs:l:" OPTION ; do
+ case $OPTION in
+ h) usage
+ exit 0
+ ;;
+ s) STEP=$OPTARG
+ ;;
+ l) LASTPUSH=$OPTARG
+ ;;
+ ?) echo "Illegal option: -$OPTARG"
+ usage
+ exit 1
+ ;;
+ esac
+done
+
+
+########## Regular workflow
+
+# Cancel if this is not a git checkout.
+[[ -d .git ]] \
+ || die "This is not a git checkout, this script won't work for you."
+
+# Cancel if EDITOR is unset or not executable.
+[[ -n "$EDITOR" && -x "$(which $EDITOR)" ]] \
+ || die "Please set your EDITOR environment variable, you'll need it."
+
+if [ $STEP -le 0 ] ; then
+ echo ">>> Step 0: Preparation"
+ # Check for a clean workdir.
+ [[ -z "$(git status -s -uno)" ]] \
+ || die "Workspace is not clean. Please commit or undo your changes."
+
+ # Persist current branch.
+ CURRENT_BRANCH=$(git status -s -b -uno | grep "^##" | awk '{print $2}')
+ persist "CURRENT_BRANCH"
+ # Get ahold of a safe temporary branch and check it out.
+ if [ "$CURRENT_BRANCH" != "$TEMP_BRANCH" ] ; then
+ delete_branch $TEMP_BRANCH
+ git checkout -b $TEMP_BRANCH
+ fi
+ # Delete branches if they exist.
+ delete_branch $BRANCHNAME
+ delete_branch $TRUNKBRANCH
+fi
+
+if [ $STEP -le 1 ] ; then
+ echo ">>> Step 1: Fetch unfetched revisions."
+ git svn fetch || die "'git svn fetch' failed."
+fi
+
+if [ $STEP -le 2 ] ; then
+ echo ">>> Step 2: Create a fresh branch."
+ git checkout -b $BRANCHNAME svn/bleeding_edge \
+ || die "Creating branch $BRANCHNAME failed."
+fi
+
+if [ $STEP -le 3 ] ; then
+ echo ">>> Step 3: Detect commit ID of last push to trunk."
+ [[ -n "$LASTPUSH" ]] || LASTPUSH=$(git log -1 --format=%H ChangeLog)
+ LOOP=1
+ while [ $LOOP -eq 1 ] ; do
+ # Print assumed commit, circumventing git's pager.
+ git log -1 $LASTPUSH | cat
+ confirm "Is the commit printed above the last push to trunk?"
+ if [ $? -eq 0 ] ; then
+ LOOP=0
+ else
+ LASTPUSH=$(git log -1 --format=%H $LASTPUSH^ ChangeLog)
+ fi
+ done
+ persist "LASTPUSH"
+fi
+
+if [ $STEP -le 4 ] ; then
+ echo ">>> Step 4: Prepare raw ChangeLog entry."
+# These version numbers are used again later for the trunk commit.
+ MAJOR=$(grep "#define MAJOR_VERSION" "$VERSION_FILE" | awk '{print $NF}')
+ persist "MAJOR"
+ MINOR=$(grep "#define MINOR_VERSION" "$VERSION_FILE" | awk '{print $NF}')
+ persist "MINOR"
+ BUILD=$(grep "#define BUILD_NUMBER" "$VERSION_FILE" | awk '{print $NF}')
+ persist "BUILD"
+
+ DATE=$(date +%Y-%m-%d)
+ persist "DATE"
+ echo "$DATE: Version $MAJOR.$MINOR.$BUILD" > "$CHANGELOG_ENTRY_FILE"
+ echo "" >> "$CHANGELOG_ENTRY_FILE"
+ COMMITS=$(git log $LASTPUSH..HEAD --format=%H)
+ for commit in $COMMITS ; do
+ # Get the commit's title line.
+ git log -1 $commit --format="%w(80,8,8)%s" >> "$CHANGELOG_ENTRY_FILE"
+ # Grep for "BUG=xxxx" lines in the commit message.
+ git log -1 $commit --format="%b" | grep BUG= | grep -v "BUG=$" \
+ | sed -e 's/^/ /' \
+ >> "$CHANGELOG_ENTRY_FILE"
+ # Append the commit's author for reference.
+ git log -1 $commit --format="%w(80,8,8)(%an)" >> "$CHANGELOG_ENTRY_FILE"
+ echo "" >> "$CHANGELOG_ENTRY_FILE"
+ done
+fi
+
+if [ $STEP -le 5 ] ; then
+ echo ">>> Step 5: Edit ChangeLog entry."
+ echo -n "Please press <Return> to have your EDITOR open the ChangeLog entry, \
+then edit its contents to your liking. When you're done, save the file and \
+exit your EDITOR. "
+ read ANSWER
+ $EDITOR "$CHANGELOG_ENTRY_FILE"
+ NEWCHANGELOG=$(mktemp)
+ # Eliminate any trailing newlines by going through a shell variable.
+ CHANGELOGENTRY=$(cat "$CHANGELOG_ENTRY_FILE")
+ [[ -n "$CHANGELOGENTRY" ]] || die "Empty ChangeLog entry."
+ echo "$CHANGELOGENTRY" > "$NEWCHANGELOG"
+ echo "" >> "$NEWCHANGELOG" # Explicitly insert two empty lines.
+ echo "" >> "$NEWCHANGELOG"
+ cat ChangeLog >> "$NEWCHANGELOG"
+ mv "$NEWCHANGELOG" ChangeLog
+fi
+
+if [ $STEP -le 6 ] ; then
+ echo ">>> Step 6: Increment version number."
+ restore_if_unset "BUILD"
+ NEWBUILD=$(($BUILD + 1))
+ confirm "Automatically increment BUILD_NUMBER? (Saying 'n' will fire up \
+your EDITOR on $VERSION_FILE so you can make arbitrary changes. When \
+you're done, save the file and exit your EDITOR.)"
+ if [ $? -eq 0 ] ; then
+ sed -e "/#define BUILD_NUMBER/s/[0-9]*$/$NEWBUILD/" \
+ -i "$VERSION_FILE"
+ else
+ $EDITOR "$VERSION_FILE"
+ fi
+ NEWMAJOR=$(grep "#define MAJOR_VERSION" "$VERSION_FILE" | awk '{print $NF}')
+ persist "NEWMAJOR"
+ NEWMINOR=$(grep "#define MINOR_VERSION" "$VERSION_FILE" | awk '{print $NF}')
+ persist "NEWMINOR"
+ NEWBUILD=$(grep "#define BUILD_NUMBER" "$VERSION_FILE" | awk '{print $NF}')
+ persist "NEWBUILD"
+fi
+
+if [ $STEP -le 7 ] ; then
+ echo ">>> Step 7: Commit to local branch."
+ restore_if_unset "NEWMAJOR"
+ restore_if_unset "NEWMINOR"
+ restore_if_unset "NEWBUILD"
+ git commit -a -m "Prepare push to trunk. \
+Now working on version $NEWMAJOR.$NEWMINOR.$NEWBUILD." \
+ || die "'git commit -a' failed."
+fi
+
+if [ $STEP -le 8 ] ; then
+ echo ">>> Step 8: Upload for code review."
+ echo -n "Please enter the email address of a V8 reviewer for your patch: "
+ read REVIEWER
+ git cl upload -r $REVIEWER --send-mail \
+ || die "'git cl upload' failed, please try again."
+fi
+
+if [ $STEP -le 9 ] ; then
+ echo ">>> Step 9: Commit to the repository."
+ echo "Please wait for an LGTM, then type \"LGTM<Return>\" to commit your \
+change. (If you need to iterate on the patch, do so in another shell.)"
+ unset ANSWER
+ while [ "$ANSWER" != "LGTM" ] ; do
+ [[ -n "$ANSWER" ]] && echo "That was not 'LGTM'."
+ echo -n "> "
+ read ANSWER
+ done
+ # Re-read the ChangeLog entry (to pick up possible changes).
+ cat ChangeLog | awk --posix '{
+ if ($0 ~ /^[0-9]{4}-[0-9]{2}-[0-9]{2}:/) {
+ if (in_firstblock == 1) {
+ exit 0;
+ } else {
+ in_firstblock = 1;
+ }
+ };
+ print $0;
+ }' > "$CHANGELOG_ENTRY_FILE"
+ git cl dcommit || die "'git cl dcommit' failed, please try again."
+fi
+
+if [ $STEP -le 10 ] ; then
+ echo ">>> Step 10: NOP"
+ # Present in the manual guide, not necessary (even harmful!) for this script.
+fi
+
+if [ $STEP -le 11 ] ; then
+ echo ">>> Step 11: Squash commits into one."
+ # Instead of relying on "git rebase -i", we'll just create a diff, because
+ # that's easier to automate.
+ git diff svn/trunk > "$PATCH_FILE"
+ # Convert the ChangeLog entry to commit message format:
+ # - remove date
+ # - remove indentation
+ # - merge paragraphs into single long lines, keeping empty lines between them.
+ restore_if_unset "DATE"
+ CHANGELOGENTRY=$(cat "$CHANGELOG_ENTRY_FILE")
+ echo "$CHANGELOGENTRY" \
+ | sed -e "s/^$DATE: //" \
+ | sed -e 's/^ *//' \
+ | awk '{
+ if (need_space == 1) {
+ printf(" ");
+ };
+ printf("%s", $0);
+ if ($0 ~ /^$/) {
+ printf("\n\n");
+ need_space = 0;
+ } else {
+ need_space = 1;
+ }
+ }' > "$COMMITMSG_FILE" || die "Commit message editing failed."
+ LOOP=1
+ while [ $LOOP -eq 1 ] ; do
+ echo "This is the trunk commit message:"
+ echo "--------------------"
+ cat "$COMMITMSG_FILE"
+ echo -e "\n--------------------"
+ confirm "Does this look good to you? (Saying 'n' will fire up your \
+EDITOR so you can change the commit message. When you're done, save the \
+file and exit your EDITOR.)"
+ if [ $? -eq 0 ] ; then
+ LOOP=0
+ else
+ $EDITOR "$COMMITMSG_FILE"
+ fi
+ done
+ rm -f "$CHANGELOG_ENTRY_FILE"
+fi
+
+if [ $STEP -le 12 ] ; then
+ echo ">>> Step 12: Create a new branch from trunk."
+ git checkout -b $TRUNKBRANCH svn/trunk \
+ || die "Checking out a new branch '$TRUNKBRANCH' failed."
+fi
+
+if [ $STEP -le 13 ] ; then
+ echo ">>> Step 13: Apply squashed changes."
+ patch -p1 < "$PATCH_FILE" | tee >(awk '{print $NF}' >> "$TOUCHED_FILES_FILE")
+ [[ $? -eq 0 ]] || die "Applying the patch to trunk failed."
+ TOUCHED_FILES=$(cat "$TOUCHED_FILES_FILE")
+ for FILE in $TOUCHED_FILES ; do
+ git add "$FILE"
+ done
+ rm -f "$PATCH_FILE"
+ rm -f "$TOUCHED_FILES_FILE"
+fi
+
+if [ $STEP -le 14 ] ; then
+ echo ">>> Step 14: Set correct version for trunk."
+ restore_if_unset "MAJOR"
+ restore_if_unset "MINOR"
+ restore_if_unset "BUILD"
+ sed -e "/#define MAJOR_VERSION/s/[0-9]*$/$MAJOR/" \
+ -e "/#define MINOR_VERSION/s/[0-9]*$/$MINOR/" \
+ -e "/#define BUILD_NUMBER/s/[0-9]*$/$BUILD/" \
+ -e "/#define PATCH_LEVEL/s/[0-9]*$/0/" \
+ -e "/#define IS_CANDIDATE_VERSION/s/[0-9]*$/0/" \
+ -i "$VERSION_FILE" || die "Patching $VERSION_FILE failed."
+fi
+
+if [ $STEP -le 15 ] ; then
+ echo ">>> Step 15: Commit to local trunk branch."
+ git add "$VERSION_FILE"
+ git commit -F "$COMMITMSG_FILE" || die "'git commit' failed."
+ rm -f "$COMMITMSG_FILE"
+fi
+
+if [ $STEP -le 16 ] ; then
+ echo ">>> Step 16: Sanity check."
+ confirm "Please check if your local checkout is sane: Inspect $VERSION_FILE, \
+compile, run tests. Do you want to commit this new trunk revision to the \
+repository?"
+ [[ $? -eq 0 ]] || die "Execution canceled."
+fi
+
+if [ $STEP -le 17 ] ; then
+ echo ">>> Step 17. Commit to SVN."
+ git svn dcommit || die "'git svn dcommit' failed."
+fi
+
+if [ $STEP -le 18 ] ; then
+ echo ">>> Step 18: Tag the new revision."
+ restore_if_unset "MAJOR"
+ restore_if_unset "MINOR"
+ restore_if_unset "BUILD"
+ git svn tag $MAJOR.$MINOR.$BUILD -m "Tagging version $MAJOR.$MINOR.$BUILD" \
+ || die "'git svn tag' failed."
+fi
+
+if [ $STEP -le 19 ] ; then
+ echo ">>> Step 19: Cleanup."
+ restore_if_unset "CURRENT_BRANCH"
+ git checkout -f $CURRENT_BRANCH
+ [[ "$TEMP_BRANCH" != "$CURRENT_BRANCH" ]] && git branch -D $TEMP_BRANCH
+ [[ "$BRANCHNAME" != "$CURRENT_BRANCH" ]] && git branch -D $BRANCHNAME
+ [[ "$TRUNKBRANCH" != "$CURRENT_BRANCH" ]] && git branch -D $TRUNKBRANCH
+fi
+
+if [ $STEP -le 20 ] ; then
+ echo ">>> Step 20: Done!"
+ restore_if_unset "MAJOR"
+ restore_if_unset "MINOR"
+ restore_if_unset "BUILD"
+ echo "Congratulations, you have successfully created the trunk revision \
+$MAJOR.$MINOR.$BUILD. Please don't forget to update the v8rel spreadsheet, \
+and to roll this new version into Chromium."
+ # Clean up all temporary files.
+ rm -f "$PERSISTFILE_BASENAME"*
+fi
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