dockcheck

A script checking updates for docker images without pulling - then selectively auto-update some/all containers.

With the help of regctl. This is just a concept for inspiration, use with care.

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Dependencies:

Running docker (duh) and compose, either standalone or plugin.
regctl by regclient (will ask to download regctl if not in PATH or PWD)

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dockcheck.sh

$ ./dockcheck.sh -h
Syntax:     dockcheck.sh [OPTION] [part of name to filter]
Example:    dockcheck.sh -a ng

Options:
-h     Print this Help.
-a|y   Automatic updates, without interaction.
-n     No updates, only checking availability.
-r     Allow updating images for docker run, wont update the container.

Basic example:

$ ./dockcheck.sh
. . .
Containers on latest version:
glances
homer

Containers with updates available:
0) ALL
1) adguardhome
2) syncthing
3) whoogle-search


Choose what containers to update:
Enter number(s) separated by comma, [q] to quit: 1,3

Then it proceedes to run pull and up -d on every container with updates.

-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.
Containers need to be manually stopped, removed and created again to run on the new image.

🪲 Squashed Bugs:

• No options for running without updates or auto update.
• No filter to check only specific containers.
• Faulty registry checkups stopped the updates completely.
• No clear checks to skip containers producing errors.
• Multi-digest images didn't correctly check with registry, giving false positives on updates.
• Not working with filenames other than docker-compose.yml
• Lists are not alphabetically sorted (due to stacks and other parameters)
• Old docker-compose binary-check sometimes returned false error
• Stacks gets updated as whole, even if only one service is chosen.
• Path broken occationally (from inspect) - probably due to old docker-compose binary.
• Script breaks if one of the chosen containers are a docker run container.
• Using relative paths for volumes eg. ${PWD}/data:data will create the volumes where you stand.

🔨 Known issues

• No granular choice of what to update (except initial name filter).
• No detailed error feedback (just skip + list what's skipped) .

dupc_function.sh

Function to quickly check for updates on a single contianer or list of containers by name. Without the need of pulling.
Preferably placed in .bashrc or similar. Example:

$ dupc ng
Updates available for local_nginx.
nginx_reverse is already latest.
Updates available for paperless-ng.

Also check out a spinoff brother-project Palleri/dockcheck-web for a WebUI-front!

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Special Thanks:

🦬 t0rnis
🐆 Palleri