Bug#893037: Add support for diffing docker-format containers

[Chris Lamb]

forwarded 893037 
https://salsa.debian.org/reproducible-builds/diffoscope/issues/39
thanks

I've forwarded this upstream here:

  https://salsa.debian.org/reproducible-builds/diffoscope/issues/39


Regards,

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Bug#893037: Add support for diffing docker-format containers

[Chris Lamb]

Jonathan Dowland wrote:

> It would be nice if diffoscope could diff against docker containers available
> on the local system.

This might be useful:

  https://github.com/wagoodman/dive


Regards,

-- 
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 : :'  : Chris Lamb
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   `-

Bug#893037: Add support for diffing docker-format containers

[Jonathan Dowland]

I poked a bit at how docker's overlay2 driver stores the layers and came
up with this temporary hack script


#!/bin/sh
set -u
set -e

if [ $# -lt 2 ]; then
echo usage: $0 before after
exit 1
fi

before="$1"
after="$2"

bfs=$(docker inspect -f '{{ .GraphDriver.Data.UpperDir }}' "$before")
afs=$(docker inspect -f '{{ .GraphDriver.Data.UpperDir }}' "$after")

diff -ruN "$bfs" "$afs"


--

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⣾⠁⢠⠒⠀⣿⡁ Jonathan Dowland
⢿⡄⠘⠷⠚⠋⠀ https://jmtd.net
⠈⠳⣄

Bug#893037: Add support for diffing docker-format containers

[Chris Lamb]

Juliana wrote:

> AFAIK, docker /images/ can be exported to tarballs. Not sure how human
> readable they are, but diffoscope can definitely work. (:> 

Indeed that would definitely work. However, the "REPL" for someone
doing this would inevitably involve someone scripting the export of
two images and then runnning diffoscope against them, instead of
simply knowing how to carve them out of, say, Docker to begin with.

This seems a little at odds with diffoscope's idea of making the
whole process of diffing two things much more usable.

Whilst my gut was initially against it, perhaps some kind of "magic"
paths (or URI scheme) would work here.

(Inspired by IRC conversation with Jon right now)


Best wishes,

-- 
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 : :'  : Chris Lamb
 `. `'`  la...@debian.org / chris-lamb.co.uk
   `-

Bug#893037: Add support for diffing docker-format containers

[Juliana Oliveira]

Hi Jonathan and Lamby,

AFAIK, docker /images/ can be exported to tarballs. Not sure how human
readable they are, but diffoscope can definitely work. (:

On Thu, 15 Mar 2018 22:52:40 + Chris Lamb  wrote:
> tags 893037 + moreinfo
> thanks
>
> Hi Jonathan,
>
> Thank you very much for the idea and wishlist bug.
>
> > It would be nice if diffoscope could diff against docker containers
available
> > on the local system.
>
> Could you briefly elaborate on what you mean here? I have a bunch of
> directories under /var/lib/docker/containers -- are you wanting to
> diffoscope two of these, or...? diffoscope basically works on "paths",
> you see.
>
>
> Best wishes,
>
> --
> ,''`.
> : :' : Chris Lamb
> `. `'` la...@debian.org / chris-lamb.co.uk
> `-
>
>

-- 

Juliana

Bug#893037: Add support for diffing docker-format containers

[Chris Lamb]

tags 893037 + moreinfo
thanks

Hi Jonathan,

Thank you very much for the idea and wishlist bug.

> It would be nice if diffoscope could diff against docker containers available
> on the local system.

Could you briefly elaborate on what you mean here? I have a bunch of
directories under /var/lib/docker/containers -- are you wanting to
diffoscope two of these, or...? diffoscope basically works on "paths",
you see.


Best wishes,

-- 
  ,''`.
 : :'  : Chris Lamb
 `. `'`  la...@debian.org / chris-lamb.co.uk
   `-

Bug#893037: Add support for diffing docker-format containers

[Jonathan Dowland]

Package: src:diffoscope
Severity: wishlist


It would be nice if diffoscope could diff against docker containers available
on the local system.


-- System Information:
Debian Release: 9.3
 APT prefers stable
 APT policy: (990, 'stable'), (600, 'unstable'), (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.14.12-x86_64-linode92 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

--

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⣾⠁⢠⠒⠀⣿⡁ Jonathan Dowland
⢿⡄⠘⠷⠚⠋⠀ https://jmtd.net
⠈⠳⣄ Please do not CC me, I am subscribed to the list.