#!/bin/sh

# install the gitolite software *system wide*.  Not too robust, fancy, etc.,
# but does have a usage message and catches simple problems.

usage() { echo "
    Usage:
        $0 [shared-bin-dir shared-conf-dir shared-hooks-dir]

    Examples:
        # as root
        $0
        # this defaults to:
        $0 /usr/local/bin /var/gitolite/conf /var/gitolite/hooks

        # as a normal user
        $0
        # this defaults to:
        $0 $HOME/bin $HOME/share/gitolite/conf $HOME/share/gitolite/hooks

    In this example, all the binaries go to /usr/local/bin, and the shared
    conf and hooks files/directories go to the other 2 directories given.  All
    the 3 paths supplied MUST be absolute.

    [RPM packagers: you can supply a 4th argument to specify a 'buildroot'
    directory.  DEB folks would call this a 'DESTDIR', I believe.  In this
    usage the first 3 arguments are NOT optional]
"
    exit 1;
}

die() { echo "$@"; echo; usage; exit 1; } >&2

validate_dir() {
    echo $1 | grep ^/ >/dev/null || die "$1 should be an absolute path"
    [ -d $1 ] || mkdir -p $1 || die "$1 does not exist and could not be created"
}

# if we have a buildroot, set that up first
buildroot=$4;
[ -n "$buildroot" ] && validate_dir $buildroot
[ -n "$buildroot" ] && buildroot=$buildroot/

# either all 3 args must be supplied or none at all
[ -n "$1" ] && [ -z "$3" ] && die "I need all 3 directories or none at all"
# supply default values to args 1, 2, and 3 if not provided
[ -z "$1" ] && {
    euid=$(perl -e 'print $>')
    if [ "$euid" = "0" ]
    then
        set /usr/local/bin /var/gitolite/conf /var/gitolite/hooks
    else
        set $HOME/bin $HOME/share/gitolite/conf $HOME/share/gitolite/hooks
    fi
    echo "using default value for EUID=$euid:" >&2
    echo "$@" >&2
}

gl_bin_dir=$1; validate_dir $buildroot$gl_bin_dir
gl_conf_dir=$2; validate_dir $buildroot$gl_conf_dir
gl_hooks_dir=$3; validate_dir $buildroot$gl_hooks_dir

bindir=`echo $0 | perl -lpe 's/^/$ENV{PWD}\// unless /^\//; s/\/[^\/]+$//;'`
cd $bindir/..       # we assume the standard gitolite source tree is here!

cp src/* $buildroot$gl_bin_dir || die "cp src/* to $buildroot$gl_bin_dir failed"
rm $buildroot$gl_bin_dir/gl-easy-install
perl -lpi -e "s(^GL_PACKAGE_CONF=.*)(GL_PACKAGE_CONF=$gl_conf_dir)" $buildroot$gl_bin_dir/gl-setup

# record which version is being sent across; we assume it's HEAD
if git rev-parse --is-inside-work-tree >/dev/null 2>&1
then
    git describe --tags --long HEAD 2>/dev/null > conf/VERSION || die "git describe failed -- this should not happen!"
else
    [ -f conf/VERSION ] || echo '(unknown)' > conf/VERSION
fi

cp -R conf/* $buildroot$gl_conf_dir || die "cp conf/* to $buildroot$gl_conf_dir failed"
perl -lpi \
    -e "s(^#\s*\\\$GL_PACKAGE_CONF\s*=.*)(\\\$GL_PACKAGE_CONF = '$gl_conf_dir';)" \
        $buildroot$gl_conf_dir/example.gitolite.rc
perl -lpi \
    -e "s(^#\s*\\\$GL_PACKAGE_HOOKS\s*=.*)(\\\$GL_PACKAGE_HOOKS = '$gl_hooks_dir';)" \
        $buildroot$gl_conf_dir/example.gitolite.rc

cp -R hooks/* $buildroot$gl_hooks_dir || die "cp hooks/* to $buildroot$gl_hooks_dir failed"