Apprise & New option -i

Added new option -i, inform - to send notifications.

.gitignore

@@ -0,0 +1,2 @@
+# ignore users custom notify.sh
+/notify.sh

README.md

@@ -15,7 +15,9 @@
 <h4 align="center">With features like excluding specific containers, filter by name, auto-prune dangling images and more.</h4</h3>
 
 
-### :bell: Recent changes
+### :bell: Changelog
+- **v0.3.3**: Added Apprise template and the option `-i` inform - to send notifications.
+- **v0.3.2**: Added a notify function to wrap a notify-script, currently DSM/Ssmtp + template script.
 - **v0.3.1**: Addded option `-m` , monochrome mode - no printf color codes.
 - **v0.3.0**: Added option `-d N`, age (days) new images have to be before being pulled and updated.
 - **v0.2.6**: regctl check / download logic changed. Now using the scripts directory as primary location.
@@ -30,9 +32,10 @@
 ___
 
 ## Dependencies
-Running docker (duh) and compose, either standalone or plugin.   
+- Running docker (duh) and compose, either standalone or plugin.   
-[`regclient/regctl`](https://github.com/regclient/regclient) (Licensed under [Apache-2.0 License](http://www.apache.org/licenses/LICENSE-2.0))   
+- [`regclient/regctl`](https://github.com/regclient/regclient) (Licensed under [Apache-2.0 License](http://www.apache.org/licenses/LICENSE-2.0))   
-User will be prompted to download `regctl` if not in `PATH` or `PWD`
+  - User will be prompted to download `regctl` if not in `PATH` or `PWD`.   
+  - regctl requires `amd64/arm64` - see [workaround](#workaround-for-non-amd64--arm64) if other architecture is used.
 ___
 
 
@@ -41,18 +44,20 @@ ___
 ## `dockcheck.sh`
 ```
 $ ./dockcheck.sh -h
- Syntax:     dockcheck.sh [OPTION] [part of name to filter] 
+ Syntax:     dockcheck.sh [OPTION] [part of name to filter]
  Example:    dockcheck.sh -y -d 10 -e nextcloud,heimdall
  
  Options:
- -h     Print this Help.
  -a|y   Automatic updates, without interaction.
- -n     No updates, only checking availability.
+ -d N   Only update to new images that are N+ days old. Lists too recent with +prefix and age. 2xSlower.
  -e X   Exclude containers, separated by comma.
- -d N   Only update to new images that are N+ days old. Lists too recent with +prefix. 2xSlower.
+ -h     Print this Help.
+ -i     Inform - send a preconfigured notification.
+ -m     Monochrome mode, no printf color codes.
+ -n     No updates, only checking availability.
  -p     Auto-Prune dangling images after update.
  -r     Allow updating images for docker run, wont update the container.
- -s     Include stopped containers in the check. (Logic: docker ps -a).
+ -s     Include stopped containers in the check. (Logic: docker ps -a)
 ```
 
 Basic example:
@@ -74,6 +79,21 @@ Enter number(s) separated by comma, [a] for all - [q] to quit:
 Then it proceedes to run `pull` and `up -d` on every container with updates.   
 After the updates are complete, you'll get prompted if you'd like to prune dangling images.
 
+### :loudspeaker: Notifications
+Trigger with the `-i` flag.   
+Run it scheduled with `-ni` to only get notified when there's updates available!  
+
+Use a `notify_X.sh` template file, copy it to `notify.sh`, modify it to your needs!   
+Current templates:
+- Synology [DSM](https://www.synology.com/en-global/dsm)
+- Email with [sSMTP](https://wiki.debian.org/sSMTP)  
+- Apprise (with it's [multitude](https://github.com/caronc/apprise#supported-notifications) of notifications)
+  - both native [caronc/apprise](https://github.com/caronc/apprise) and the standalone [linuxserver/docker-apprise-api](https://github.com/linuxserver/docker-apprise-api)
+
+Further additions are welcome - suggestions or PR!   
+Initiated and first contributed by [yoyoma2](https://github.com/yoyoma2).  
+
+
 ### :warning: `-r flag` disclaimer and warning
 **Wont auto-update the containers, only their images. (compose is recommended)**   
 `docker run` dont support using new images just by restarting a container.  
@@ -84,6 +104,27 @@ Containers need to be manually stopped, removed and created again to run on the
 - Not respecting `--profile` options when re-creating the container.
 - Not working well with containers created by Portainer.
 
+### Workaround for non **amd64** / **arm64**
+`regctl` provides binaries for amd64/arm64, to use on other architecture you could try this workaround.
+Run regctl in a contianer wrapped in a shell script. Copied from [regclient/docs/install.md](https://github.com/regclient/regclient/blob/main/docs/install.md):
+
+```sh
+cat >regctl <<EOF
+#!/bin/sh
+opts=""
+case "\$*" in
+  "registry login"*) opts="-t";;
+esac
+docker container run \$opts -i --rm --net host \\
+  -u "\$(id -u):\$(id -g)" -e HOME -v \$HOME:\$HOME \\
+  -v /etc/docker/certs.d:/etc/docker/certs.d:ro \\
+  ghcr.io/regclient/regctl:latest "\$@"
+EOF
+chmod 755 regctl
+```
+Test it with `./regctl --help` and then either add the file to the same path as *dockcheck.sh* or in your path (eg. `~/.local/bin/regctl`).
+
+
 ## `dc_brief.sh`
 Just a brief, slimmed down version of the script to only print what containers got updates, no updates or errors.
 

dockcheck.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
-VERSION="v0.3.1"
+VERSION="v0.3.3"
-### ChangeNotes: Added feature (-m) Monochrome Mode, no printf color codes.
+### ChangeNotes: Added option -i, inform - notify. Added Appraise template.
 Github="https://github.com/mag37/dockcheck"
 RawUrl="https://raw.githubusercontent.com/mag37/dockcheck/main/dockcheck.sh"
 
@@ -14,6 +14,7 @@ ScriptWorkDir="$(dirname "$ScriptPath")"
 LatestRelease="$(curl -s -r 0-50 $RawUrl | sed -n "/VERSION/s/VERSION=//p" | tr -d '"')"
 LatestChanges="$(curl -s -r 0-200 $RawUrl | sed -n "/ChangeNotes/s/### ChangeNotes: //p")"
 
+
 ### Help Function:
 Help() {
   echo "Syntax:     dockcheck.sh [OPTION] [part of name to filter]" 
@@ -24,6 +25,7 @@ Help() {
   echo "-d N   Only update to new images that are N+ days old. Lists too recent with +prefix and age. 2xSlower."
   echo "-e X   Exclude containers, separated by comma."
   echo "-h     Print this Help."
+  echo "-i     Inform - send a preconfigured notification."
   echo "-m     Monochrome mode, no printf color codes."
   echo "-n     No updates, only checking availability."
   echo "-p     Auto-Prune dangling images after update."
@@ -39,14 +41,14 @@ c_blue="\033[0;34m"
 c_teal="\033[0;36m"
 c_reset="\033[0m"
 
-
 Stopped=""
-while getopts "aynprhsme:d:" options; do
+while getopts "aynprhisme:d:" options; do
   case "${options}" in
     a|y) AutoUp="yes" ;;
     n)   AutoUp="no" ;;
     r)   DRunUp="yes" ;;
     p)   AutoPrune="yes" ;;
+    i)   [ -s $ScriptWorkDir/notify.sh ] && { source $ScriptWorkDir/notify.sh ; Notify="yes" ; } ;;
     e)   Exclude=${OPTARG} ;;
     m)   declare c_{red,green,yellow,blue,teal,reset}="" ;;
     s)   Stopped="-a" ;;
@@ -232,6 +234,7 @@ fi
 if [[ -n ${GotUpdates[*]} ]] ; then 
    printf "\n%bContainers with updates available:%b\n" "$c_yellow" "$c_reset"
    [[ -z "$AutoUp" ]] && options || printf "%s\n" "${GotUpdates[@]}"
+   [[ ! -z "$Notify" ]] && { [[ $(type -t send_notification) == function ]] && send_notification "${GotUpdates[@]}" || printf "Could not source notification function.\n" ; }
 fi
 
 ### Optionally get updates if there's any 

notify_DSM.sh

@@ -0,0 +1,34 @@
+### DISCLAIMER: This is a third party addition to dockcheck - best effort testing.
+#
+# Copy/rename this file to notify.sh to enable email notifications on Synology DSM
+# DSM Notification Email has to be configured manually.
+# Modify to your liking - changing SendMailTo and Subject and content.
+
+send_notification() {
+Updates=("$@")
+UpdToString=$( printf "%s\n" "${Updates[@]}" )
+FromHost=$(hostname)
+
+# User variables:
+# change this to your usual destination for synology DSM notification emails
+SendMailTo="me@mydomain.com"
+SubjectTag="diskstation"
+
+printf "\nSending email notification.\n"
+
+ssmtp $SendMailTo << __EOF
+From: "$FromHost" <$SendMailTo>
+date:$(date -R)
+To: <$SendMailTo>
+Subject: [$SubjectTag] Updates available on $FromHost
+Content-Type: text/plain; charset=UTF-8; format=flowed
+Content-Transfer-Encoding: 7bit
+
+The following containers on $FromHost have updates available:
+
+$UpdToString
+
+ From $FromHost
+
+__EOF
+}

notify_apprise.sh

@@ -0,0 +1,37 @@
+### DISCLAIMER: This is a third party addition to dockcheck - best effort testing.
+#
+# Copy/rename this file to notify.sh to enable the notification snippet.
+# Required receiving services must already be set up.
+# Modify to fit your setup - if API, set AppriseURL to your Apprise ip/domain.
+
+send_notification() {
+Updates=("$@")
+UpdToString=$( printf "%s\n" "${Updates[@]}" )
+FromHost=$(hostname)
+
+printf "\nSending Apprise notification\n"
+
+MessageTitle="$FromHost - updates available."
+# Setting the MessageBody variable here.
+read -d '\n' MessageBody << __EOF
+Containers on $FromHost with updates available:
+
+$UpdToString
+
+__EOF
+
+# Modify to fit your setup:
+apprise -vv -t "$MessageTitle" -b "$MessageBody" \
+   mailto://myemail:mypass@gmail.com \
+   mastodons://{token}@{host} \
+   pbul://o.gn5kj6nfhv736I7jC3cj3QLRiyhgl98b \
+   tgram://{bot_token}/{chat_id}/
+
+### If you use the Apprise-API - Comment out the apprise command above.
+### Uncomment the AppriseURL and the curl-line below:
+# AppriseURL="http://apprise.mydomain.tld:1234/notify/apprise"
+# curl -X POST -F "title=$MessageTitle" -F "body=$MessageBody" -F "tags=all" $AppriseURL
+
+}
+
+

notify_generic.sh

@@ -0,0 +1,14 @@
+### DISCLAIMER: This is a third party addition to dockcheck - best effort testing.
+#
+# Copy/rename this file to notify.sh to enable the notification snippet.
+# generic sample, the "Hello World" of notification addons
+
+send_notification() {
+  Updates=("$@")
+  UpdToString=$( printf "%s\n" "${Updates[@]}" )
+  FromHost=$(hostname)
+
+  # platform specific notification code would go here
+  printf "\n%bGeneric notification addon:%b" "$c_green" "$c_reset"
+  printf "\nThe following docker containers on %s need to be updated:\n%s\n" "$FromHost" "$UpdToString"
+}

notify_ssmtp.sh

@@ -0,0 +1,32 @@
+### DISCLAIMER: This is a third party addition to dockcheck - best effort testing.
+#
+# Copy/rename this file to notify.sh to enable the notification snipppet.
+# sSMTP has to be installed and configured manually.
+# Modify to fit your setup - changing SendMailFrom, SendMailTo, SubjectTag
+
+send_notification() {
+Updates=("$@")
+UpdToString=$( printf "%s\n" "${Updates[@]}" )
+FromHost=$(hostname)
+
+# User variables:
+SendMailFrom="me@mydomain.tld"
+SendMailTo="me@mydomain.tld"
+SubjectTag="dockcheck"
+
+printf "\nSending email notification.\n"
+
+ssmtp $SendMailTo << __EOF
+From: "$FromHost" <$SendMailFrom>
+date:$(date -R)
+To: <$SendMailTo>
+Subject: [$SubjectTag] Updates available on $FromHost
+Content-Type: text/plain; charset=UTF-8; format=flowed
+Content-Transfer-Encoding: 7bit
+
+The following containers on $FromHost have updates available:
+
+$UpdToString
+
+__EOF
+}