fetchlib

#!/usr/bin/env bash
#
# fetchlib -- wraps Mercurial to painless clone repositories of a given revision.
#
# Copyright 2008 Alexander Saltanov
#


# USAGE
#   ./fetchlib http://bitbucket.org/bruno django-geoportail=40 aspirator=61
#
# You'll have django-geoportail of revision 40, and aspirator of revision 61 in your current directory.


# COMPLEX USAGE PATTERN
#
# Assumptions:
#   * ./lib contains only fethed libraries. Libraries may be removed and refetched before build will actually run.
#   * Current project and libraries are stored in the same mercurial repository.
#   * We may redefine path to repository with environment variable REPO_FULLPATH.
#
# Bash snippet (c) by Alexander Kolov:
#   CURRENT_PROJECT_NAME = 'mediaplanner'
#
#   # Set up repository path.
#   REPO_FULLPATH=$("$HG" paths)
#   if [[ "x${OVERRIDE_REPO_PATH}" != "x" ]]; then
#     REPO_FULLPATH="default = ${OVERRIDE_REPO_PATH}"
#     echo "repo path is overriden from environment, set to \"$REPO_FULLPATH\""
#   fi
#
#   REPOSITORY=`echo "${REPO_FULLPATH}" | grep default | awk '{ print $3 }'`
#   if [[ $REPOSITORY == http://* ]]; then
#     REPOSITORY=`echo "${REPOSITORY}" | sed 's/$(CURRENT_PROJECT_NAME)//'`
#   fi
#   echo "Checking out libraries from source repository..."
#   rm -rf lib && mkdir lib && cd lib && ../fetchlib $REPOSITORY \
#     base=128 \
#     clock=39 \
#     cstring=48 \
#     dotconfpp=27 \
#     geo=40 \
#     io=32 \
#     logger=0 \
#     mafsa=5 \
#     mpdatap=47 \
#     sockets=50 \
#     tclap=6 \
#     threads=7 \
#     turglem=7 \
#     webserver=438 \
#   && cd ..


PROGNAME=`basename $0`
ECHO=/bin/echo

function usage() {
  $ECHO "Usage: $PROGNAME [path-to-repository] [library=version] ..." 1>&2
  $ECHO
  exit 1
}
	
# Check for correct number of parameters
test $# -gt 1 || usage;
	
HG=`which hg`
if test $? -ne 0; then
  # Error message is printed by 'which'
  exit 1
fi

REPO=$1
shift 1

for LIB in $*; do
  name=`$ECHO $LIB | cut -f1 -d'='`
  rev=`$ECHO $LIB | cut -f2 -d'=' -s`
	
  # Strict mode: do not allow blank revison.
  if [ -z $rev ]; then
    $ECHO "Undefined revision for library '$name'!"
    exit 2
  fi
	
  $ECHO " * Fetching revision $rev from $REPO/$name"
  $HG clone --rev $rev $REPO/$name
  if test $? -ne 0; then
    # Error message is printed by 'hg'
  	exit 1
  fi
done