Regression: "unterminated quoted string" using escape sequences in inspect template

[owtaylor]

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind bug

Description

Steps to reproduce the issue:

1. `podman pull registry.access.redhat.com/ubi8'

2. podman inspect registry.access.redhat.com/ubi8 --format='{{ range .Config.Env }}{{ . }}{{"\n"}}{{ end }}'

Describe the results you received:

ERRO[0000] Printing inspect output: template: all inspect:1: unterminated quoted string

Describe the results you expected:

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
container=oci

Additional information you deem important (e.g. issue happens only occasionally):

• Works fine with "podman version 3.4.4"

• The example above isn't minimal - podman info -f '{{ "hello world\n" }}' will reproduce too. But showing it as a more realistic example.

• A workaround is to use {{ println . }} instead of {{ . }}{{ "\n" }}

• See Unterminated quoted string bug owtaylor/toolbox-vscode#21

Output of podman version:

podman version 4.0.0-rc4

Output of podman info --debug:

[ omitted for readability, if this isn't obviously reproducible, I will provide ]

Package info (e.g. output of rpm -q podman or apt list podman):

podman-4.0.0-0.6.rc4.fc36.x86_64

Have you tested with the latest version of Podman and have you checked the Podman Troubleshooting Guide? (https://github.com/containers/podman/blob/main/troubleshooting.md)

Yes

[mheon]

@jwhonce PTAL

[flouthoc]

Hi @owtaylor I think this change was intentionally added here containers/common#831 so \n can be replaced with actual breakline when used in format string.

Your use-case is already documented here in tests: containers/common#831

So something like this should work
podman inspect registry.access.redhat.com/ubi8 --format='{{ range .Config.Env }}{{ . }}\n{{ end }}'
or
podman inspect registry.access.redhat.com/ubi8 --format='{{ range .Config.Env }}{{ . }}{{`\n`}}{{ end }}'

I'm closing this issue but feel free to re-open.

[owtaylor]

OK, dug into this some, and I believe that the situation is:

• podman < 4: \t is replaced with a literal tab for all templates
• docker cli: \t is replaced with a literal tab, \n is replaced with a literal newline for many template arguments (ps, images, etc), no replacements are done for other templates (inspect, info). With the dividing line being, as I understand it, the templates where the table keyword can be used to get tabular output for a list of objects.
• podman 4: \t is replaced with a literal tab, \n is replaced with a literal newline for all templates

So we see that the behavior of podman inspect in podman 4 matches neither the behavior of podman < 4 or the behavior of docker inspect. The example I provided works fine with docker inspect.

I can see where the docker behavior where different --format= arguments are treated differently could be considered a bit wonky. But it seems that, for the case of inspect, that an incompatible change that is being made to increase compatibility with the docker CLI is making things less compatible with the docker CLI?

[flouthoc]

I think for consistency --format of all the options should match but if docker inspect is being treated as anomaly then I think we should also do this, but since changes in containers/common#831 seemed intentional so I'll request @jwhonce to take a look.

I'll also re-open this issue since this needs more clarification.

[github-actions]

A friendly reminder that this issue had no activity for 30 days.

[rhatdan]

@flouthoc Lets match docker inspect.

[flouthoc]

#13446 (comment)

but since changes in containers/common#831 seemed intentional so I'll request @jwhonce to take a look.

@rhatdan I was not entirely sure about the above PR and changed seemed intentional hence requested @jwhonce to take a look.

[github-actions]

A friendly reminder that this issue had no activity for 30 days.

[github-actions]

A friendly reminder that this issue had no activity for 30 days.

[rhatdan]

@flouthoc since we never heard word back from @jwhonce lets fix it to match inspect.

[github-actions]

A friendly reminder that this issue had no activity for 30 days.

[in-fke]

why does this does not work?

podman inspect --format='{{join .HostConfig.Binds "\n"}}' container
ERRO[0000] Printing inspect output: template: all inspect:1: unterminated quoted string

podman --version
podman version 4.2.0

[Luap99]

Because this was fixed in v4.3

[in-fke]

Because this was fixed in v4.3

Thanks for the quick reply - I am still struggling finding out which GitHub Issue actually fixed in which version / tag / branch.