dockcheck

A script to checking updates for docker images without the need of pulling - then having the option to auto-update.

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

Dependencies:

Running docker (duh) and compose, either standalone or plugin.
regctl by regclient
The script will ask to download regctl if it's not in PATH or current directory.

`dockcheck.sh`

$ ./dockcheck.sh -h
Syntax:     dockcheck.sh [OPTION] [optional string to filter names]

Options:
-h     Print this Help.
-a     Automatic updates, without interaction.
-n     No updates, only checking availability.

A script to check for updates on all currently running containers without pulling images, list them and give the option to update.

Basic example:

$ ./dockcheck.sh
. . .
Containers with updates available:
whoogle-search

Containers on latest version:
glances
homer

Do you want to update? y/[n]
y

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

And with -n No updates and gl for *gl* filtering:

$ ./dockcheck.sh -n gl
. . .
Containers with updates available:
whoogle-search

Containers on latest version:
glances

No updates installed, exiting

Example-video:

🪲 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.~~

🔨 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.

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