docker rmi will fail if image has multiple repo:tag references

[HardySimpson]

Learn many from docker-gc. I didn't run docker-gc but read the code.

the docker-gc's way of remove a image is

docker rmi $(image_id)

if the image has multiple repo:tag reference to it, the command will fail.
my shell removes repo:tag instead of imageid mostly, avoid the bug.

[jaakkytt]

Also stumbled upon of this after seeing my image in images.reap not being deleted.
Ran the last line of the docker-gc file again:

$ xargs -n 1 docker rmi < images.reap 
Error response from daemon: Conflict, cannot delete image e33b075d9148c4ef66be11e7faa1d1a46144e10427fdb81406fff97270f61ca2 because it is tagged in multiple repositories, use -f to force
Error: failed to remove images: [e33b075d9148c4ef66be11e7faa1d1a46144e10427fdb81406fff97270f61ca2]

[dnephin]

If this is a critical issue for anyone, you might be interested in https://github.com/Yelp/docker-custodian (disclaimer: I'm the primary contributor), which has basically identical functionality to docker-gc (except that it's python not bash, has unit tests, and uses the api instead of the cli).

It handles this issue:
https://github.com/Yelp/docker-custodian/blob/v0.4.0/docker_custodian/docker_gc.py#L119

[arnib]

This should be fixed in #72, enable by using FORCE_IMAGE_REMOVAL=1 docker-gc