working on watch-containers.sh
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lib.sh
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lib.sh
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##
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## Information
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## (don't touch unless you are me)
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##
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LIB_NAME="lib.sh"
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@ -1,89 +1,179 @@
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#!/bin/bash
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#!/usr/bin/env bash
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# name: watch_containers.sh
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# author: david@socialnerds.org
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# version: 0.1
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# license: GPLv3
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# description: Checks if the running container count
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# matches a number provided as $1 and optionally
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# reports results to a healthchecks endpoint.
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# usage: ./watch_containers.sh <number> <optional-healthchecks-url>
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## ## ## ## ## ## ## ## ## ## ## ## ## ##
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## ##
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## watch-containers.sh ##
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## ##
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## Watch running containers and report ##
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## any changes to Healthchecks ##
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## ##
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## ## ## ## ## ## ## ## ## ## ## ## ## ##
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# **** function definitions ****
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function usage {
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echo "usage: ./watch-containers.sh <number> <optional-healthchecks-url>"
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##
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## Information
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## (don't touch unless you are me)
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##
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NAME="watch-containers.sh"
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DESCRIPTION="Watch running containers and report any changes to Healthchecks"
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VERSION="0.2.0"
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AUTHOR="david@socialnerds.org"
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LICENSE="MIT"
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WEBSITE="https://git.socialnerds.org/david/scripts"
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CHANGELOG=("[2023-10-30][v0.2.0] Complete rewrite based on the new template.sh"
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"[2022-01-22][v0.1.0] Initial version")
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##
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## Configuration
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##
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EXECUTABLE="$(basename $0)"
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LIBRARIES="lib.sh"
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DEPENDENCIES="basename dirname readlink jq docker"
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REQUIRE_ROOT=0
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#TODO: make the cache file configurable with an option flag
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CACHE_FILE="/var/cache/watch-containers.json"
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ONLY_IN_CACHE=()
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ONLY_IN_CURRENT=()
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##
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## Functions
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##
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# Print help information
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function print_help() {
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printf "%s\n\n%s\n%b\n\n%s\n %-15s %s\n %-15s %s\n %-15s %s\n %-15s %s\n %-15s %s\n" \
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"$DESCRIPTION" "Usage:" "$LIB_BOLD$EXECUTABLE <options> <healthchecks-url>$LIB_CLEAR" "Options:" \
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"-s, --state" "Save current state to file and exit" \
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"-h, --help" "Print help screen and exit" \
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"-i, --info" "Print script information and exit" \
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"-v, --verbose" "More verbose output" \
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"-q, --quiet" "No output except errors (overrides -v)"
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}
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function get_container_count {
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local CNT=$(docker ps --format {{.Names}} | wc -l)
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if is_int "$CNT"; then
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echo $CNT
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fi
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}
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function is_int {
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local INT_EXPR='^[0-9]+$'
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if [[ $1 =~ $INT_EXPR ]]; then
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return 0
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##
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## Preflight
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##
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# Load BASH libraries
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SCRIPT_PATH=$(readlink -f "$0")
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SCRIPT_DIR=$(dirname "$SCRIPT_PATH")
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for LIBRARY in $LIBRARIES; do
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if [[ -r "$SCRIPT_DIR/$LIBRARY" ]]; then
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#echo "Loading library file [$SCRIPT_DIR/$LIBRARY]"
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source "$SCRIPT_DIR/$LIBRARY"
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else
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return 1
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fi
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}
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function is_url {
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local URL_EXPR='^https?://.+$'
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if [[ $1 =~ $URL_EXPR ]]; then
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return 0
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else
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return 1
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fi
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}
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# **** start ****
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#exit if no options
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if [ -z "$1" ]; then
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usage
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exit 1
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fi
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#exit if $1 is no intager
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if ! is_int "$1"; then
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usage
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exit 1
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fi
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#set expected running containers
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NUM=$1
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#get running container count
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CNT=$(get_container_count)
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#set healthchecks url if not empty
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URL=""
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if [ -n "$2" ]; then
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#exit if $2 is no valid url
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if ! is_url "$2"; then
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usage
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echo "Error: Cannot load library file [$SCRIPT_DIR/$LIBRARY]"
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exit 1
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fi
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URL="$2"
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done
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# Check for root privileges
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if ! lib_amiroot && [[ $REQUIRE_ROOT -eq 1 ]]; then
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lib_print "!You need to have root privileges"
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exit 1
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fi
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MSG="Running containers: $CNT
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Expected containers: $NUM"
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# Check for dependencies
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MISSING_COMMANDS=$(lib_missing_commands $DEPENDENCIES)
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if [[ -n "$MISSING_COMMANDS" ]]; then
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lib_print "!One or more commands missing [$MISSING_COMMANDS]"
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lib_print "Try installing them with your package manager"
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exit 1
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fi
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echo "$MSG"
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#report to healthchecks
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if [ -n "$URL" ]; then
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if [ $NUM -eq $CNT ]; then
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curl -m 10 --retry 5 --data-raw "$MSG" "$URL"
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else
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curl -m 10 --retry 5 --data-raw "$MSG" "$URL/fail"
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##
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## Liftoff
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##
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while [[ "$1" =~ ^- && ! "$1" == "--" ]]; do
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case $1 in
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-s|--state)
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S=1
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;;
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-h|--help)
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H=1
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;;
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-i|--info)
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I=1
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;;
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-v|--verbose)
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V=1
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;;
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-q|--quiet)
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Q=1
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;;
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*)
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lib_print "!Unknown option [$1]"
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lib_print "Try --help or -h for available options"
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exit 1
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;;
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esac
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shift
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done
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if [[ "$1" == '--' ]]; then
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shift
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fi
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if [[ $I -eq 1 ]]; then
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lib_print_info
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exit 0
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elif [[ $H -eq 1 ]]; then
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print_help
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exit 0
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elif [[ $S -eq 1 ]]; then
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docker ps --no-trunc --format json > $CACHE_FILE
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lib_print "Saving current state to cache file [$CACHE_FILE]"
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exit 0
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fi
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# Get containers from cache file
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if [[ -r "$CACHE_FILE" ]]; then
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lib_print "?Reading cache from file [$CACHE_FILE]"
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CACHE=($(cat $CACHE_FILE | jq -r .Names))
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else
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lib_print "!No cache file found [$CACHE_FILE]"
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exit 1
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fi
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# Get currently running containers
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CURRENT=($(docker ps --no-trunc --format json | jq -r .Names))
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# Iterate through the $CACHE array and check if each element is in the $CURRENT array
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for I in "${CACHE[@]}"; do
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if [[ " ${CURRENT[*]} " != *" $I "* ]]; then
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ONLY_IN_CACHE+=("$I")
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fi
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fi
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done
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# Iterate through the $CURRENT array and check if each element is in the CACHE array
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for I in "${CURRENT[@]}"; do
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if [[ " ${CACHE[*]} " != *" $I "* ]]; then
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ONLY_IN_CURRENT+=("$I")
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fi
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done
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# Print result
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echo "Missing container(s): ${ONLY_IN_CACHE[@]}"
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echo "New container(s): ${ONLY_IN_CURRENT[@]}"
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#if [[ -z "$1" ]]; then
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# print_help
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# exit 0
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#else
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#fi
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##
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## Here be dragons
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##
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# **** end ****
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exit 0
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