bocker pull does not support public registry, can't pull from there anymore about bocker

[AXGKl]

This downloads from v2, based on the moby one but w/o go (hardcoded amd64) and jq (this was hard) deps.

• New dependency: python (2 or 3)
• Tested only for a few images with v2 schemas.
• Fragile hack - but the original is as well
  https://gist.github.com/AXGKl/9acf71366348e0ab0b85dd9258374792

[pwFoo]

Should be fixed with the updated version here?
https://github.com/frohoff/bocker

[pwFoo]

But the bocker version with fixed pull from @frohoff has more dependencies!
https://github.com/frohoff/bocker/blob/master/bocker#L25

And download-frozen-image-v2 needs curl, go and jq...
https://github.com/moby/moby/blob/master/contrib/download-frozen-image-v2.sh#L11

Is there a way to download and extract docker images without so much dependencies?

[tst2005]

if the go command is only use to detect the current OS, it could be replaced by uname (or uname -s).

[pwFoo]

@tst2005
Good point!
OS and ARCH

curl would be ok.

What's about jq (3,77MB binary linux64)

[EDIT]
Is there a simple bash script to download a docker image from a shell without dependencies?
Searched for a simple way to download an image...
[/EDIT]

[tst2005]

IMHO,

• s/without dependencies/with a few dependencies/
• jq is a very powerfull utility to process json data. It is hard to deal with json without it. I don't know alternative or pure bash implementation

[pwFoo]

@AXGKl
You should add python in dependency check?
https://gist.github.com/AXGKl/9acf71366348e0ab0b85dd9258374792#file-docker_image_downloader-sh-L13

Python should be pre-installed with centos, but needs to be installed with other os variants?

[NoseyNick]

I was about to suggest...

awk -F ': *' '$1 == "X-Docker-Token" { print $2 }'

needs to be case-insensitive:

awk -F ': *' 'tolower($1) == "x-docker-token" { print $2 }'

... but yeah nah, this goes deeper, needs the v2 API 😐

Can borrow from https://github.com/jjlin/docker-image-extract ?