tiny-cloud/lib/tiny-cloud/common

# Tiny Cloud - common script functions
# vim: ts=4 et ft=sh:

# set defaults
[ -f "$ROOT/etc/tiny-cloud.conf" ] && . "$ROOT/etc/tiny-cloud.conf"
: "${CLOUD:=unknown}"
: "${CLOUD_USER:=alpine}"
: "${TINY_CLOUD_LOGS:=$ROOT/var/log}"
: "${TINY_CLOUD_VAR:=$ROOT/var/lib/cloud}"

log() {
    local facility="local7"
    local stderr init
    local tag=$(basename "$0")
    while [ "${1#-}" != "$1" ]; do
        case "$1" in
            -i) init=1 ;;   # TODO: value = indent?
            -f) facility="$2"; shift ;;
            -s) stderr=-s ;;
            -t) tag="$tag/$2"; shift ;;
        esac
        shift
    done
    local level="$1"
    [ -z "$DEBUG" ] && [ "$level" = debug ] && return
    shift

    [ -n "$init" ] && echo "$@" >&2
    logger $stderr -p "$facility.$level" -t "$tag[$$]" "$@"
    case "$level" in
        crit|alert|emerg) exit 1 ;;
    esac
}

# usage: replace_word <search> <replace> <list>...
replace_word() {
    local search="$1" replace="$2"
    shift 2
    for word in "$@"; do
        if [ "$word" = "$search" ]; then
            echo "$replace"
        else
            echo "$word"
        fi
    done
}

# usage: insert_after <where> <what> <list>...
insert_after() {
    local search="$1" addition="$2"
    shift 2
    for i in "$@"; do
        echo "$i"
        if [ "$i" = "$search" ]; then
            echo "$addition"
        fi
    done
}

# usage: add_once <file> <line-to-add>...
add_once() {
    local file="$1"
    shift
    for line; do
        if ! grep -x -F "$line" "$file" 2>/dev/null; then
            mkdir -p "${file%/*}"
            printf "%s\n" "$line" >> "$file"
        fi
    done
}