dependencies

#!/bin/sh
# This software is delivered under the terms of the MIT License
#
# Copyright (c) 2009 Christophe Guillon <christophe.guillon.perso@gmail.com>
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#

#
# dependencies script
# 
# Get usage with:
#   ./dependencies -h
#
# This scripts gets a specific version of deptools if not present.
# Then is executes it deptools/deptools.py with the given arguments.
# The actual dependency on deptools is owned by this script.
# The other dependencies are handled by the deptools DEPENDENCIES files.
#
# For local usage in a project, copy this script and optionally change:
# DEPTOOL_REPO=... and
# DEPTOOL_REV=...
# to the local repository for deptool and either origin/master or a fixed
# revision of deptools to ensure strict dependency on deptools itself.
#

set -e
dir=`dirname $0`

DEPTOOL_REPO=${DEPTOOL_REPO:-https://github.com/knochelh/deptools.git}
DEPTOOL_REV=${DEPTOOL_REV:-e0580b55818e03ac2525629873f3fe13b3232f94}

error() { echo "`basename $0`: error: $1" >&2; exit 1; }
warning() { echo "`basename $0`: warning: $1" >&2; }

# Extract deptools at the required revision
[ -d deptools ] || git clone -b master ${DEPTOOL_REPO} deptools
[ -d deptools/.git ] || error "trying to run dependencies from the deptools repository itself or deptools dir is corrupted."
(cd deptools && git fetch origin) || warning "unable to update deptools from origin repository: ${DEPTOOL_REPO}. Use DEPTOOL_REPO=local_repo envvar."
current_revision=`cd deptools && git log HEAD | head -1`
requested_revision=`cd deptools && git log ${DEPTOOL_REV} | head -1`
[ "$requested_revision" != "" ] || warning "unable to get requested revision of deptools ${DEPTOOL_REV}. Use DEPTOOL_REV=revision envvar."
[ "$requested_revision" = "" -o "$requested_revision" = "$current_revision" ] || echo "deptools updated from ${current_revision} to ${requested_revision}."
[ "$requested_revision" = "" ] || (cd deptools && git reset --quiet --hard ${DEPTOOL_REV})
[ -e deptools/deptools/deptool.py ] || error "a problem occured while updating deptools. Fix ./deptools repository and retry."

# Execute deptools
deptools/deptools/deptool.py ${1+"$@"}