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Begin with an empty image store: docker rmi -f $(docker images -q)
Then try this: docker pull scratch
This worked in versions <= 1.5.
In version 1.5, the result is:
$ docker pull scratch
Pulling repository scratch
511136ea3c5a: Download complete
FATA[0003] 'scratch' is a reserved name
Note that Docker does go to the trouble of pulling an image.
After which this is the state of the image store:
$ docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
<none> <none> 511136ea3c5a 22 months ago 0 B
The image is downloaded but remains anonymous.
This commit started treating scratch as a "special case". Reasonable discussions can be had about whether or not that was a good idea, but the behavior of docker pull scratch is clearly incorrect. Either the command should be rejected before the image is downloaded or the command should run to completion successfully.
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