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#!/bin/bash
# Set needed environment variables and do basic checks
function hydra_set_env {
export COMMIT="`( cd $APP_BASE && git log -n 1 --pretty=oneline | cut -d " " -f 1 )`"
export CONFIG="$HOME/.hydra/config"
export ACTION="$1"
if [ ! -z "$HYDRA" ]; then
export HYDRA_FOLDER="`hydra_eval_parameter $HYDRA`"
export PREFERENCES="$HOME/.hydra/$HYDRA"
fi
}
# Read a parameter from user
function hydra_user_input {
local input
local param="$1"
local default="$2"
shift 2
if echo $param | grep -q 'passwd'; then
read -s -rep "$* (defaults to $default): " input
else
read -rep "$* (defaults to $default): " input
fi
if [ -z "$input" ]; then
export $param="$default"
else
export $param="$input"
fi
}
# Get a configuration parameter if not previously defined by a sourced file
function hydra_user_config {
local param="$1"
local default="$2"
shift 2
if [ -z "`eval echo '$'$param`" ]; then
hydra_user_input $param $default $*
fi
}
# Install a package
function hydra_install_package {
if [ -z "$1" ]; then
return
fi
dpkg -s $1 &> /dev/null
if [ "$?" == "1" ]; then
echo "Installing package $1..."
DEBIAN_FRONTEND=noninteractive apt-get install $1 -y
fi
}
# Truncate a database
function hydra_truncate_database {
if [ ! -z "$1" ]; then
mysql $1 -e "drop database $1; create database $1;"
fi
}
# Check for a command
function hydra_check_command {
if [ -z "$1" ]; then
return
fi
if ! which $1 &> /dev/null; then
echo "Please install a package for $1 to run this action"
exit 1
fi
}
# Check for an user
function hydra_check_user {
if [ -z "$1" ]; then
return 1
fi
grep -qe "^$1:" /etc/passwd
}
# Check for a group
function hydra_check_group {
if [ -z "$1" ]; then
return 1
fi
grep -qe "^$1:" /etc/group
}
# Abort on error
function hydra_exit_on_error {
if [ "$?" != "0" ]; then
echo "Error: $*"
exit 1
fi
}
# Run a command or abort
function hydra_safe_run {
$*
hydra_exit_on_error $*
}
# Determine the next debian release
function hydra_next_debian_release {
local release="$1"
if [ "$release" == "lenny" ]; then
echo "squeeze"
elif [ "$release" == "squeeze" ]; then
echo "wheezy"
elif [ "$release" == "wheezy" ]; then
echo "jessie"
elif [ "$release" == "jessie" ]; then
echo "stretch"
else
echo "Unsupported release"
exit 1
fi
}
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