A Bash script that wraps FPM, allowing access to certain environment variables in an RPM post install script

create_rpm.sh

#!/bin/bash

# get the actual directory for this script, resolving links and relative paths
SOURCE="${BASH_SOURCE[0]}"
while [ -h "$SOURCE" ] ; do SOURCE="$(readlink "$SOURCE")"; done
DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"


ARCH="${ARCH:-x86_64}"
RELEASE="${RELEASE:-`date +%Y_%m_%d_%H%M`}"
VERSION="${VERSION:-1.0}"
MAINTAINER="${MAINTAINER:-someone@example.com}"
PREFIX="${PREFIX:-/opt/servers/my_sweet_application}"
NAME="my-sweet-app"

mkdir -p $DIR/tmp

cat > $DIR/tmp/post_remove.sh <<EOF
rm -fR $PREFIX/some_known_directory
EOF

cat > $DIR/tmp/post_install.sh <<EOF
cd $PREFIX/some_known_directory/some_sub_directory
echo "PREFIX: $PREFIX"
IP=/sbin/ifconfig | grep '(192.168|10.1|10.2)' | cut -d: -f2 | cut -d' ' -f1

# note that if you want to refer to environment variables
# that you set up within this script, you need to escape
# the dollar-sign
case \$IP in
  192.168.201. )
    # local environment
    export HOST="\$IP"
    export PORT="4567"
    export USER="foobar"
    export PASSWORD="t0ps3cr*t"
    export SCHEMA="app1"
    ;;
  10.1.1. )
    # perhaps a QA environment
    export HOST="\$IP"
    export PORT="9000"
    export USER="qa1"
    export PASSWORD="qapasswordthatseasytoremember"
    export SCHEMA="qa-app1"
    ;;
  10.2.200.201 )
    # a prod environment
    export HOST="\$IP"
    export PORT="9001"
    export USER="prod"
    export PASSWORD="AlRj*7&5$0FaN_kE)"
    export SCHEMA="prod-app1"
    ;;
  10.2.200.202 )
    # a prod environment
    export HOST="\$IP"
    export PORT="9002"
    export USER="prod"
    export PASSWORD="AlRj*7&5$0FaN_kE)"
    export SCHEMA="prod-app2"
    ;;
  10.2.200.203 )
    # a prod environment
    export HOST="\$IP"
    export PORT="9003"
    export USER="prod"
    export PASSWORD="AlRj*7&5$0FaN_kE)"
    export SCHEMA="prod-app2"
    ;;
  10.2.200.204 )
    # a prod environment
    export HOST="\$IP"
    export PORT="9004"
    export USER="prod"
    export PASSWORD="AlRj*7&5$0FaN_kE)"
    export SCHEMA="prod-app4"
    ;;
  "" )
    echo "Strange! We're deploying to an unhandled IP range"
    exit -1
    ;;
esac

# Do other stuff, potentially using the environment variables
# that are already available to you. Don't forget that you also
# have some variables available to you from RPM (eg. \$BUILD_ROOT)

EOF

fpm -a $ARCH -s dir -t rpm -v $VERSION -n $NAME --iteration $RELEASE -m $MAINTAINER \
    --after-install $DIR/tmp/post_install.sh --after-remove $DIR/tmp/post_remove.sh \
    --vendor "Acme Corp" --license '(c) Acme Corp' --prefix $PREFIX/ -C $DIR/deployment/platform .