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+#!/bin/sh
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+# From Gerrit Code Review 2.4.2
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+#
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+# Part of Gerrit Code Review (http://code.google.com/p/gerrit/)
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+#
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+# Copyright (C) 2009 The Android Open Source Project
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+#
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+# Licensed under the Apache License, Version 2.0 (the "License");
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+# you may not use this file except in compliance with the License.
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+# You may obtain a copy of the License at
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+#
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+# http://www.apache.org/licenses/LICENSE-2.0
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+#
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+# Unless required by applicable law or agreed to in writing, software
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+# distributed under the License is distributed on an "AS IS" BASIS,
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+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+# See the License for the specific language governing permissions and
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+# limitations under the License.
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+#
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+
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+CHANGE_ID_AFTER="Bug|Issue"
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+MSG="$1"
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+
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+# Check for, and add if missing, a unique Change-Id
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+#
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+add_ChangeId() {
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+ clean_message=`sed -e '
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+ /^diff --git a\/.*/{
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+ s///
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+ q
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+ }
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+ /^Signed-off-by:/d
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+ /^#/d
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+ ' "$MSG" | git stripspace`
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+ if test -z "$clean_message"
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+ then
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+ return
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+ fi
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+
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+ # Does Change-Id: already exist? if so, exit (no change).
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+ if grep -i '^Change-Id:' "$MSG" >/dev/null
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+ then
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+ return
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+ fi
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+
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+ id=`_gen_ChangeId`
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+ T="$MSG.tmp.$$"
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+ AWK=awk
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+ if [ -x /usr/xpg4/bin/awk ]; then
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+ # Solaris AWK is just too broken
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+ AWK=/usr/xpg4/bin/awk
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+ fi
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+
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+ # How this works:
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+ # - parse the commit message as (textLine+ blankLine*)*
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+ # - assume textLine+ to be a footer until proven otherwise
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+ # - exception: the first block is not footer (as it is the title)
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+ # - read textLine+ into a variable
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+ # - then count blankLines
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+ # - once the next textLine appears, print textLine+ blankLine* as these
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+ # aren't footer
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+ # - in END, the last textLine+ block is available for footer parsing
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+ $AWK '
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+ BEGIN {
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+ # while we start with the assumption that textLine+
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+ # is a footer, the first block is not.
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+ isFooter = 0
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+ footerComment = 0
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+ blankLines = 0
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+ }
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+
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+ # Skip lines starting with "#" without any spaces before it.
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+ /^#/ { next }
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+
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+ # Skip the line starting with the diff command and everything after it,
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+ # up to the end of the file, assuming it is only patch data.
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+ # If more than one line before the diff was empty, strip all but one.
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+ /^diff --git a/ {
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+ blankLines = 0
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+ while (getline) { }
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+ next
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+ }
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+
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+ # Count blank lines outside footer comments
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+ /^$/ && (footerComment == 0) {
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+ blankLines++
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+ next
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+ }
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+
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+ # Catch footer comment
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+ /^\[[a-zA-Z0-9-]+:/ && (isFooter == 1) {
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+ footerComment = 1
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+ }
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+
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+ /]$/ && (footerComment == 1) {
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+ footerComment = 2
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+ }
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+
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+ # We have a non-blank line after blank lines. Handle this.
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+ (blankLines > 0) {
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+ print lines
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+ for (i = 0; i < blankLines; i++) {
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+ print ""
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+ }
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+
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+ lines = ""
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+ blankLines = 0
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+ isFooter = 1
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+ footerComment = 0
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+ }
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+
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+ # Detect that the current block is not the footer
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+ (footerComment == 0) && (!/^\[?[a-zA-Z0-9-]+:/ || /^[a-zA-Z0-9-]+:\/\//) {
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+ isFooter = 0
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+ }
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+
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+ {
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+ # We need this information about the current last comment line
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+ if (footerComment == 2) {
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+ footerComment = 0
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+ }
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+ if (lines != "") {
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+ lines = lines "\n";
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+ }
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+ lines = lines $0
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+ }
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+
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+ # Footer handling:
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+ # If the last block is considered a footer, splice in the Change-Id at the
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+ # right place.
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+ # Look for the right place to inject Change-Id by considering
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+ # CHANGE_ID_AFTER. Keys listed in it (case insensitive) come first,
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+ # then Change-Id, then everything else (eg. Signed-off-by:).
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+ #
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+ # Otherwise just print the last block, a new line and the Change-Id as a
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+ # block of its own.
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+ END {
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+ unprinted = 1
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+ if (isFooter == 0) {
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+ print lines "\n"
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+ lines = ""
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+ }
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+ changeIdAfter = "^(" tolower("'"$CHANGE_ID_AFTER"'") "):"
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+ numlines = split(lines, footer, "\n")
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+ for (line = 1; line <= numlines; line++) {
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+ if (unprinted && match(tolower(footer[line]), changeIdAfter) != 1) {
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+ unprinted = 0
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+ print "Change-Id: I'"$id"'"
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+ }
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+ print footer[line]
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+ }
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+ if (unprinted) {
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+ print "Change-Id: I'"$id"'"
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+ }
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+ }' "$MSG" > $T && mv $T "$MSG" || rm -f $T
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+}
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+_gen_ChangeIdInput() {
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+ echo "tree `git write-tree`"
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+ if parent=`git rev-parse "HEAD^0" 2>/dev/null`
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+ then
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+ echo "parent $parent"
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+ fi
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+ echo "author `git var GIT_AUTHOR_IDENT`"
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+ echo "committer `git var GIT_COMMITTER_IDENT`"
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+ echo
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+ printf '%s' "$clean_message"
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+}
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+_gen_ChangeId() {
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+ _gen_ChangeIdInput |
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+ git hash-object -t commit --stdin
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+}
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+
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+
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+add_ChangeId
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