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#!/usr/bin/env bash
# Log a message as error, and exit the program. This is intended for serious
# issues that prevent the script from running correctly. The exit code can be
# specified with -i, or will default to 1.
die() {
local OPTIND
local code
while getopts ":i:" opt
do
case "$opt" in
i) code=$OPTARG ;;
esac
done
shift $(( OPTIND -1 ))
alert "$@"
exit ${code:-1}
}
# Fetch a file from an URL. Using this function introduces a dependency on curl.
fetch() {
local OPTIND
local buffer
while getopts ":o:" opt
do
case "$opt" in
o) buffer=$OPTARG ;;
esac
done
shift $(( OPTIND -1 ))
[[ -z $buffer ]] && buffer="$(tempfile)"
notice "Downloading $1 to $buffer"
# TODO: Switch to the most appropriate downloading tool, depending on
# what is available.
curl -Ls "$1" > "$buffer"
local exit_code=$?
printf "%s" "$buffer"
return $exit_code
}
# Read a particular value from a key/value configuration file. Using this
# function introduces a dependency on awk.
config_etc_kv() {
local file="$BASEDIR/etc/$1"
shift
if [[ ! -f $file ]]
then
crit "Tried to read value for $1 from $file, but $file does not exist"
return
fi
debug "Reading value for $1 from $file"
awk -F= '$1 == "'"$1"'" { print $NF }' "$file"
}
# Create a temporary directory. Similar to tempfile, but you'll get a directory
# instead.
tempdir() {
local dir="$(mktemp -d)"
# Ensure the file was created succesfully
if [[ ! -d "$dir" ]]
then
die "Failed to create a temporary directory at $dir"
fi
debug "Temporary file created at $dir"
printf "$dir"
}
# Create a temporary file. In usage, this is no different from mktemp itself,
# however, it will apply additional checks to ensure everything is going
# correctly, and the files will be cleaned up automatically at the end.
tempfile() {
local OPTIND
local extension="tmp"
while getopts ":x:" opt
do
case "$opt" in
x) extension=$OPTARG ;;
esac
done
shift $(( OPTIND -1 ))
local file="$(mktemp --suffix ".$extension")"
# Ensure the file was created succesfully
if [[ ! -f "$file" ]]
then
die "Failed to create a temporary file at $file"
fi
debug "Temporary file created at $file"
printf "$file"
}
export -f config_etc_kv
export -f die
export -f fetch
export -f tempdir
export -f tempfile
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