#!/bin/bash

LC_COLLATE="C"
progname="${0##*/}"

warn ()
{
    [ "$1" ] && echo >&2
    [ "$1" ] && echo "$progname: $1" >&2
    [ "$1" ] && echo >&2
}

fatal ()
{
    warn "$2"
    exit "$1"
}

usage ()
{
    cat <<EOF
Usage: $progname <tag> <pindate>
  where <tag> is a tag of the ldiskfs module
  and <pindate> is an optional quoted timestamp suitable for cvs -D
EOF
}

if [ -z "$LDISKFSCVS_UPDATED" ] ; then
    echo "$progname: updating ldiskfscvs"
    cvs up -l || fatal 1 "Error updating ldiskfscvs"
    export LDISKFSCVS_UPDATED=yes
    exec "$0" "$@"
fi

[ "$1" = "-r" ] && shift

buildtag="HEAD"
tag="$1"
shift
pindate=$1
shift

if [ "$*" ] ; then
    usage >&2
    exit 1
fi

case "$tag" in
    '')
        warn "a tag is required."
	usage >&2
	exit 1
	;;
    --help | -h)
	usage
	exit 0
	;;

    # this is the branch table
    # keep this list sorted alphabetically!

    # So far there's just HEAD.

    *)
        buildtag="HEAD"
	;;
esac

error_modules=
cvs_cmd ()
{
    dir="$1"
    module="$2"
    tag="$3"
    cotag=""
    update=""

    if [ "$tag" = "HEAD" ] ; then
        cotag=""
        uptag="-A"
    elif [ "$tag" ] ; then
        cotag="-r $tag"
        uptag="-r $tag"
    else
        # silently skip if no tag was specified
        return
    fi

    # create a cvs date format that will survive shell expansion
    if [ -n "$pindate" ]; then
        datecmd=$(date -u +%s -d "$pindate")
        datecmd="-D @$datecmd"
    else
        datecmd=""
    fi

    if [ -d "$dir" ] ; then
        echo "$progname: Updating $dir to $tag"
        ( cd "$dir" && cvs up $datecmd -dAP $uptag )
    else
        echo "$progname: Checking out $dir from $tag"
        cvs co $datecmd -P $cotag -d "$dir" "$module"
    fi
    if [ $? != 0 ] ; then
        error_modules="$dir $error_modules"
    fi
}

cvs_cmd build lustre-build "$buildtag"