'error extracting tarball' with Ubuntu docker image

[alicebob]

Hello,

I'm trying to build an image on the docker Ubuntu image, but it only works when acbuild is run as root.

$ acbuild --debug begin docker://ubuntu:latest
Beginning build with docker://ubuntu:latest
Downloading sha256:9332eaf1a55 [=============================]     162 B / 162 B
Downloading sha256:af49a5ceb2a [=============================] 50.1 MB / 50.1 MB
Downloading sha256:8f9757b472e [=============================]     824 B / 824 B
Downloading sha256:e931b117db3 [=============================]     518 B / 518 B
Downloading sha256:a3ed95caeb0 [=============================]       32 B / 32 B
Downloading sha256:47b5e16c081 [=============================]     682 B / 682 B
begin: error extracting tarball
$

As root it's all fine:

# acbuild --debug begin docker://ubuntu:latest 
Beginning build with docker://ubuntu:latest
Downloading sha256:af49a5ceb2a [=============================] 50.1 MB / 50.1 MB
Downloading sha256:e931b117db3 [=============================]     518 B / 518 B
Downloading sha256:47b5e16c081 [=============================]     682 B / 682 B
Downloading sha256:8f9757b472e [=============================]     824 B / 824 B
Downloading sha256:9332eaf1a55 [=============================]     162 B / 162 B
Downloading sha256:a3ed95caeb0 [=============================]       32 B / 32 B
# 

Going via docker2aci gives the same problem. acbuild I installed via go get a few days ago. Of course I can just run things as root (not great, but fine), but the error message could be improved.

[jonboulle]

Seems like we might want to introduce the rkt log package to be able to properly print the wrapped error here.

[shuhaowu]

Using the latest master (bc82f81029aa304e1bd23d4a778406a953971e42), I definitely still see this error. However, using docker2aci (74ed3c05137aeb20c7d2cb5886b95c7e0faec1cf) seems to work fine.

Does this mean someone just have to bump the docker2aci in vendor to make it work?

[shuhaowu]

Spoke too soon, turns out if you download an image via docker2aci and try to use acbuild without root, this will still fail.

[sepbot]

I don't have any problems beginning a build with docker://alpine as a regular user but docker://base/archlinux fails the same way as described above without super user privileges.

[sanmai-NL]

Confirmed under Linux 4.11.9-1-ARCH #1 SMP PREEMPT Wed Jul 5 18:23:08 CEST 2017 x86_64 GNU/Linux with only XFS filesystems mounted.