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¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ 
àfPìð  .wFšir´þ’2_Y
*Æ€x\«
ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1    2Ž‰$€$I$#‰SÞ’H
ë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ#!/bin/bash
set -f

VERBOSITY=0
SUPPORTED_VCS="bzr hg git url"
RET_UNCLAIMED=3
RET_SUCCESS=0
RET_FAIL=1
DEF_COMMAND="vcs_run"

Usage() {
	cat <<EOF
Usage: ${0##*/} [ options ] repo-url [command [arguments]]

   obtain repository from repo-url, and execute 'command' with 'arguments'

   Command will default to '$DEF_COMMAND' in the top level of the repository.

   options:
      -t | --target  DIR   checkout branch to DIR [./(basename repo)]
           --vcs-type  V   repo-url is of type 'V' [auto]
                           supported: auto $SUPPORTED_VCS
      -v | --verbose       increase verbosity
      -D | --deps          attempt to install dependencies if necessary

   Example:
    * run 'stack.sh' in git://github.com/openstack-dev/devstack.git
      vcs-run --deps git://github.com/openstack-dev/devstack.git stack.sh
    * build cloud-utils
      vcs-run --deps lp:cloud-utils -- ./tools/build-deb -us -uc

EOF
}

bad_Usage() { Usage 1>&2; [ $# -eq 0 ] || error "$@"; return 1; }
error() { echo "$@" 1>&2; }
debug() {
	local level=${1}; shift;
	[ "${level}" -gt "${VERBOSITY}" ] && return
	error "${@}"
}

has_cmd() {
	command -v "$1" >/dev/null 2>&1
}

get_cmd() {
	# get_cmd(cmd, get_deps, packages)
	#   get command 'cmd' if necessary by installing 'packages'
	#   if 'get_deps' is false, then return error.
	local cmd="$1" deps="$2"
	shift 2
	has_cmd "$1" && return 0
	$deps || { error "No cmd '$cmd', but nodeps specified"; return 1; }
	apt_install "$@"
}

apt_install() {
	local cmd=""
	cmd=( env DEBIAN_FRONTEND=noninteractive apt-get --quiet
		--assume-yes install "$@" )
	[ "$(id -u)" = "0" ] ||
		cmd=( sudo "${cmd[@]}" )
	debug 1 "installing dependencies:" "${cmd[@]}"
	"${cmd[@]}"
}

vcsget_bzr() {
	# deps type src target cmd
	local deps="$1" rtype="$2" src="$3" target="$4" tmp=""
	if [ "$rtype" = "auto" ]; then
		case "$src" in
			*.bzr|bzr:*|lp:*) :;;
			*)
				if ! [ -d "$src" -a -d "$src/.bzr" ]; then
					return $RET_UNCLAIMED
				fi
				src=$(cd "$src" && pwd) || return $RET_FAIL
				;;
		esac
	fi
	get_cmd bzr "$deps" bzr || return $RET_FAIL
	if [ -z "$target" ]; then
		case "$src" in
			*/*) tmp="${src##*/}";;
			*:*) tmp="${src#*:}";;
			*)   tmp="$src"
		esac
		target="${tmp%.bzr}"
	fi
	local cmd="" q="--quiet"
	[ $VERBOSITY -gt 1 ] && q=""

	if [ -d "$target/.bzr" ]; then
		debug 1 "updating $target: bzr pull ${q:+$q }$src"
		( cd "$target" && bzr pull $q "$src" )
	else
		debug 1 "branching to $target: bzr branch ${q:+$q }$src"
		bzr branch $q "$src" "$target"
	fi
	[ $? -eq 0 ] || return $RET_FAIL
	_RET="$target"
	return 0
}

vcsget_git() {
	# deps type src target cmd
	local deps="$1" rtype="$2" src="$3" target="$4" tmp=""
	if [ "$rtype" = "auto" ]; then
		case "$src" in
			*.git|git:*) :;;
			*)
				if ! [ -d "$src" -a -d "$src/.git" ]; then
					return $RET_UNCLAIMED
				fi
				src=$(cd "$src" && pwd) || return $RET_FAIL
				;;
		esac
	fi
	get_cmd git "$deps" git || return $RET_FAIL
	if [ -z "$target" ]; then
		tmp="${src##*/}"
		target="${tmp%.git}"
	fi
	local q="--quiet"
	[ $VERBOSITY -gt 1 ] && q=""
	if [ -d "$target/.git" ]; then
		debug 1 "updating $target: git pull ${q:+$q }${src}"
		( cd "$target" && git pull $q "$src" )
	else
		debug 1 "cloning to $target: git clone ${q:+$q }$src $target"
		git clone $q "$src" "$target" || return $RET_FAIL
	fi
	[ $? -eq 0 ] || return $RET_FAIL
	_RET="$target"
	return 0
}

vcsget_hg() {
	# deps type src target cmd
	local deps="$1" rtype="$2" src="$3" target="$4" tmp=""
	if [ "$rtype" = "auto" ]; then
		case "$src" in
			*.hg|hg:*) :;;
			*) return $RET_UNCLAIMED;;
		esac
	fi
	get_cmd hg "$deps" mercurial || return $RET_FAIL
	if [ -z "$target" ]; then
		tmp="${src##*/}"
		target="${tmp%.hg}"
	fi
	local quiet="--quiet"
	[ $VERBOSITY -gt 1 ] && quiet=""
	hg clone $quiet "$src" "$target" || return $RET_FAIL
	_RET="$target"
	return 0
}

vcsget_url() {
	# deps type src target cmd
	# if target is not specified, target directory is md5sum
	# of the url.  If cmd does not start with a /, then use it
	# as the output filename.  If it does start with a /, then
	# store the url in DEF_COMMAND in this directory.
	local deps="$1" rtype="$2" src="$3" target="$4" cmd="$5" tmp=""
	if [ "$rtype" = "auto" ]; then
		case "$src" in
			http://*|https://*) :;;
			*) return $RET_UNCLAIMED;;
		esac
	fi
	get_cmd wget "$deps" wget || return $RET_FAIL
	if [ -z "$target" ]; then
		target=$(echo "$src" | md5sum)
		target=${target%  -}
	fi

	local cmdname="$cmd"
	if [ "${cmd#/}" != "$cmd" ]; then
		cmdname="./$DEF_COMMAND"
	fi

	local quiet="--quiet"
	[ $VERBOSITY -gt 1 ] && quiet=""

	mkdir -p "$target" ||
		{ error "failed mkdir -p '$target'"; return $RET_FAIL; }
	debug 1 "wget -O '$target/$cmdname' '$src'"
	wget $quiet -O "$target/$cmdname" "$src" || {
		error "failed wget -O '$target/$cmdname' '$src'"
		return $RET_FAIL
	}

	_RET="$target"
	return 0
}

main() {
	local short_opts="hDt:v"
	local long_opts="help,deps,target:,vcs-type:,verbose"
	local getopt_out=$(getopt --name "${0##*/}" \
		--options "${short_opts}" --long "${long_opts}" -- "$@") &&
		eval set -- "${getopt_out}" ||
		{ bad_Usage; return; }

	local cur="" next="" target="" rtype="auto" tmp=""
	local def_target="" deps="" getdeps=false arg0=""

	while [ $# -ne 0 ]; do
		cur="$1"; next="$2";
		case "$cur" in
			-h|--help) Usage ; exit 0;;
			-D|--deps) getdeps=true;;
			-t|--target) target=$next; shift;;
			   --vcs-type) rtype=$next; shift;;
			-v|--verbose) VERBOSITY=$((${VERBOSITY}+1));;
			--) shift; break;;
		esac
		shift;
	done

	[ $# -gt 0 ] || { bad_Usage "must provide at least repo"; return; }

	src_repo="$1"
	shift
	[ -n "$src_repo" ] || { error "empty source repo?"; return 1; }

	if [ -n "$target" ]; then
		tmp=$(dirname "${target}")
		[ -d "$tmp" ] || mkdir -p "$tmp" ||
			{ error "failed to create $tmp for '$target'"; return 1; }
	fi

	if [ $# -eq 0 ]; then
		set -- "$DEF_COMMAND"
	fi
	arg0="$1"

	local vcs vcslist="${SUPPORTED_VCS}"
	[ "$rtype" = "auto" ] || vcslist="$rtype"

	local workd=""
	for vcs in $vcslist; do
		has_cmd "vcsget_$vcs" ||
			{ error "unknown vcs type '$vcs'"; return 1; }
		"vcsget_$vcs" "$getdeps" "$rtype" "$src_repo" "$target" "$arg0"
		ret=$?
		case "$ret" in
			$RET_UNCLAIMED) :;; # not claimed
			$RET_SUCCESS) workd="$_RET"; break;;
			*) error "failed to get '$src_repo' of type '$vcs'";
				return $ret;;
		esac
	done

	[ -d "$workd" ] ||
		{ error "unknown source repo '$src_repo'"; return 1; }

	cd "$workd" ||
		{ error "failed to enter target dir '$workd'"; return 1; }

	if [ -f "./$1" ]; then
		if [ ! -x "./$1" ]; then
			debug 1 "adding execute to ./$1"
			chmod ugo+x "./$1" ||
				{ error "failed add execute to ./$1"; return 1; }
		fi
		tmp="./$1"
		shift
		set -- "$tmp" "$@"
	elif ! has_cmd "$1"; then
		error "command '$1' not available anywhere"
		return 1
	fi

	debug 1 "executing command in $PWD:" "$@"
	exec "$@"
}

main "$@"
# vi: ts=4 noexpandtab