genbuild.sh
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genbuild.sh
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	#!/bin/sh
	# Copyright (c) 2012-2016 The Bitcoin Core developers
	# Distributed under the MIT software license, see the accompanying
	# file COPYING or http://www.opensource.org/licenses/mit-license.php.

	export LC_ALL=C
	if [ $# -gt 1 ]; then
	cd "$2" \|\| exit 1
	fi
	if [ $# -gt 0 ]; then
	FILE="$1"
	shift
	if [ -f "$FILE" ]; then
	INFO="$(head -n 1 "$FILE")"
	fi
	else
	echo "Usage: $0 <filename> <srcroot>"
	exit 1
	fi

	GIT_TAG=""
	GIT_COMMIT=""
	if [ -e "$(command -v git)" ] && [ "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = "true" ]; then
	# clean 'dirty' status of touched files that haven't been modified
	git diff >/dev/null 2>/dev/null

	# if latest commit is tagged and not dirty, then override using the tag name
	RAWDESC=$(git describe --abbrev=0 2>/dev/null)
	if [ "$(git rev-parse HEAD)" = "$(git rev-list -1 $RAWDESC 2>/dev/null)" ]; then
	git diff-index --quiet HEAD -- && GIT_TAG=$RAWDESC
	fi

	# otherwise generate suffix from git, i.e. string like "59887e8-dirty"
	GIT_COMMIT=$(git rev-parse --short=12 HEAD)
	git diff-index --quiet HEAD -- \|\| GIT_COMMIT="$GIT_COMMIT-dirty"
	fi

	if [ -n "$GIT_TAG" ]; then
	NEWINFO="#define BUILD_GIT_TAG \"$GIT_TAG\""
	elif [ -n "$GIT_COMMIT" ]; then
	NEWINFO="#define BUILD_GIT_COMMIT \"$GIT_COMMIT\""
	else
	NEWINFO="// No build information available"
	fi

	# only update build.h if necessary
	if [ "$INFO" != "$NEWINFO" ]; then
	echo "$NEWINFO" >"$FILE"
	fi