#!/bin/sh

if test "${GPG_TTY+set}" = set
then
	WE_STARTED_AGENT=no
	echo >&2 Reusing existing agent
else
	WE_STARTED_AGENT=yes

	GPG_TTY=$(tty) &&
	export GPG_TTY &&

	if AGENT=$(gpg-agent --daemon 2>/dev/null)
	then
		eval "$AGENT" &&
		GPG_AGENT_PID=$(expr "$GPG_AGENT_INFO" : ".*:\([1-9][0-9]*\):[1-9][0-9]*$") &&
		trap 'kill -0 2>/dev/null $GPG_AGENT_PID &&
		      kill $GPG_AGENT_PID' 0 1 2 3 15 &&
		kill -0 "$GPG_AGENT_PID"
	else
		# agent is always on
		gpgconf --kill gpg-agent
		GPG_AGENT_PID=
	fi || exit
fi

gpg="gpg --use-agent --local-user 96AFE6CB!" || exit

formats='htmldocs manpages'

products () {
	with_sig=: with_src=echo
	case "$1" in
	with-sig)
		with_sig=echo
		shift
		;;
	only-sig)
		with_sig=echo with_src=:
		shift
		;;
	esac
	version=$1
	$with_src "git-$version.tar.gz"
	$with_sig "git-$version.tar.sig"
	for fmt in $formats
	do
		$with_src "git-$fmt-$version.tar.gz"
		$with_sig "git-$fmt-$version.tar.sig"
	done
}

report () {
	ls -l "git-$1.sign" $(products with-sig "$1")
}


failed=
for tar in git-[0-9]*.tar.gz
do
	version=$(expr "$tar" : 'git-\(.*\)\.tar.gz$')

	if test -f "git-$version.tar.sig"
	then
		can_skip=yes
		for file in $(products with-sig "$version")
		do
			if ! test -f "$file"
			then
				can_skip=no
				break
			fi
		done
		if test "$can_skip" = yes
		then
			report "$version"
			continue
		fi
	fi

	rm -f $(products only-sig $version)

	files="$tar"
	missing=
	for fmt in $formats
	do
		doc="git-$fmt-$version.tar.gz"
		if test -f "$doc"
		then
			files="$files $doc"
		else
			missing="$missing $doc"
		fi
	done
	case "$missing" in
	?*)
		echo >&2 "Missing files: $missing"
		failed="$failed $version"
		continue
		;;
	esac
	sha1sum $files | $gpg --clearsign >git-$version.sign || {
		failed="$failed $version"
		continue
	}

	for file in $files
	do
		gzip -dc <"$file" >"${file%.gz}" &&
		$gpg -b "${file%.gz}" || {
			failed="$failed $version"
			rm -f "${file%.gz}.sig"
		}
		rm -f "${file%.gz}"
	done

	case " $failed " in
	*" $version "*)
		continue
		;;
	esac

	report "$version"
done

if test "$WE_STARTED_AGENT" = yes
then
	if test -n "$GPG_AGENT_PID"
	then
		kill "$GPG_AGENT_PID"
	else
		gpgconf --kill gpg-agent
	fi
fi