init script for multiple thin instances with rbenv shared install

thin.sh

#!/bin/sh

# thin  This shell script takes care of starting and stopping
#       thin daemon from rbenv shared install
#
# chkconfig:    2345 85 15 
# description:  thin is an Ruby web server
# config:       /etc/sysconfig/thin

### BEGIN INIT INFO
# Provides:          thin
# Required-Start:    $local_fs $remote_fs
# Required-Stop:     $local_fs $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      S 0 1 6
# X-Start-Before:    nginx
# X-Stop-After:      nginx
# Short-Description: thin initscript
# Description:       This shell script takes care of starting and
#                    stopping thin daemon from rbenv shared install
### END INIT INFO


# Source function library.
. /etc/rc.d/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network

# Check that networking is up.
[ "$NETWORKING" = "no" ] && exit 0

RBENV_DIR="/opt/rbenv"
THIN_BIN="$RBENV_DIR/shims/thin"
CONFIG_DIR="/etc/thin"
CONFIG_FILE_EXT=".yml"

[ -f /etc/sysconfig/thin ] && . /etc/sysconfig/thin

if [ ! -x "$THIN_BIN" ]; then
    echo "error: thin executable does not exist or not executable: $THIN_BIN" && exit 1
fi

if [ -d "$RBENV_DIR" ]; then
    export RBENV_ROOT="$RBENV_DIR"
    export PATH="$RBENV_ROOT/bin:$PATH"
    eval "$(rbenv init -)"
else
    echo "error: rbenv directory does not exist: $RBENV_DIR" && exit 1
fi

thin_ctl() {
    local command=$1; shift

    [ ! -d $CONFIG_DIR ] && echo "error: directory does not exist: $CONFIG_DIR" && exit 1

    if [ $# -eq 0 ]; then
        CONFIG_FILES=`cd ${CONFIG_DIR} && ls *${CONFIG_FILE_EXT}`
    else
        for app_name in "$@"; do
            CONFIG_FILES="$CONFIG_FILES ${app_name}${CONFIG_FILE_EXT}"
        done
    fi

    for config_file in ${CONFIG_FILES[@]}; do
        echo "thin $command ${config_file//$CONFIG_FILE_EXT}"
        [ ! -e "${CONFIG_DIR}/${config_file}" ] && echo "error: file does not exist: ${CONFIG_DIR}/${config_file}" && exit 1

        case $command in
        start|stop|restart)
            chdir=`egrep "^chdir:" "${CONFIG_DIR}/${config_file}" | awk '{ print $2 }'`
            [ ! -d "$chdir" ] && echo "error: chdir directory does not exist: $chdir" && exit 1
            cd "$chdir"
            "$THIN_BIN" -C "${CONFIG_DIR}/${config_file}" $command
            ;;
        *)
            echo "Unknown command ${command}"
            ;;
        esac
    done

    return 0
}

enable_application() {
    old="$1$CONFIG_FILE_EXT.disabled"
    new="$1$CONFIG_FILE_EXT"
    [ ! -e "$CONFIG_DIR/$old" ] && echo "error: file does not exist: $CONFIG_DIR/$old" && exit 1
    mv "$CONFIG_DIR/$old" "$CONFIG_DIR/$new"
}

disable_application() {
    old="$1$CONFIG_FILE_EXT"
    new="$1$CONFIG_FILE_EXT.disabled"
    [ ! -e "$CONFIG_DIR/$old" ] && echo "error: file does not exist: $CONFIG_DIR/$old" && exit 1
    mv "$CONFIG_DIR/$old" "$CONFIG_DIR/$new"
}

config() {
  echo "Creating config directory: $CONFIG_DIR"
  [ ! -d "$CONFIG_DIR" ] && mkdir "$CONFIG_DIR"

  echo "Creating config example: $CONFIG_DIR/example${CONFIG_FILE_EXT}.disabled"

  cd /var/www/html/sl/redmine

  "$THIN_BIN" config -C "${CONFIG_DIR}/example${CONFIG_FILE_EXT}.disabled" \
    -u nobody -g nobody --tag example \
    -s 4 --max-conns 1024 --max-persistent-conns 512 \
    -S /tmp/example.sock -c /var/www/html/example \
    -l /var/log/thin/example.log -P /var/run/example.pid \
    -A autodetect -e production
}

if [ $# -gt 2 ]; then
    exit 2
fi

case "$1" in
    start|stop|restart)
        thin_ctl "$@"
        ;;
    enable|disable)
        [ -z "$2" ] && echo "error: missing app_name" && exit 1
        $1_application "$2"
        ;;
    config)
        config
        ;;
    *)
        echo "Usage: $0 {start|stop|restart|enable|disable|config} [app_name]"
        exit 2
        ;;
esac

exit 0