Find Version Tag for Latest Docker Image
Home Page: https://ryandaniels.ca/blog/find-version-tag-latest-docker-image/
License: MIT License
Hi, I was reading your blog post that goes with this script. If you wanted to get the version associated with an image that is also tagged 'latest', you should be able to do the following...
IMAGEID=sha_of_image
docker image inspect $IMAGEID | jq -r '.[].RepoTags'
for example, when I do this on a postgres image I have, I get the following...
[
"postgres:13.2",
"postgres:latest"
]
Note, this works on most 'mainstream' (ie popular) images as its considered a best practice. If the maintainer doesn't full that, then your script will be needed to try and figure out what 'latest' is.
https://index.docker.io/v2 requests authentication
For example the command:
./docker_image_find_tag.sh -n portainer -i 5526251cc61f -f 2.13. -l 10 -v
outputs:
Using IMAGE_NAME: portainer
Using REGISTRY: https://index.docker.io/v2
Found Image ID Source: sha256:5526251cc61f126f2c1da1875aae113c9af05a5679123dde2f6c15d12754b103
Error 401 from: https://index.docker.io/v2/library/portainer/tags/list
HTTP_BODY: {"errors":[{"code":"UNAUTHORIZED","message":"authentication required","detail":[{"Type":"repository","Class":"","Name":"library/portainer","Action":"pull"}]}]}
I'm trying to use docker_image_find_tag.sh, and can't get it to work even with one of your examples:
$ docker_image_find_tag.sh -n traefik -i 96c63a7d3e50 -f 1.7. -l 10 -v
Using IMAGE_NAME: traefik
Using REGISTRY: https://index.docker.io/v2
parse error: Invalid numeric literal at line 2, column 4
I'm running this on a Windows 10 system, using Ubuntu via WSL 2.
At first the script failed because jq wasn't recognized, but once I installed that I couldn't get any further than the error above.
I got the error when execute this command. thanks!
docker_image_find_tag.sh: line 175: CURL_AUTH[@]: unbound variable
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