ParentMain/nsenter: do not fail if getwd errors

[apostasie]

To fix #3328

It is not clear to me if there would be side-effects to this.

nsenter specialists opinion highly welcome.

[apostasie]

Comment addressed.
CI is green.

[djdongjin]

LGTM, thanks. btw did you verify if this resolves the issue? i.e. the repro in #3328 works now:

mkdir foo
cd foo
rmdir ../foo
nerdctl container run -d --name foo debian sleep Inf
FATA[0000] getwd: no such file or directory

[apostasie]

LGTM, thanks. btw did you verify if this resolves the issue? i.e. the repro in #3328 works now:

mkdir foo
cd foo
rmdir ../foo
nerdctl container run -d --name foo debian sleep Inf
FATA[0000] getwd: no such file or directory

Yes, it does fix the issue.
I am just mildly concerned about the behavior of nsenter in such a condition, but then... this is (somewhat) abnormal to start with.

[fahedouch]

IMO we may even set the working directory after nsenter with --wdns

[apostasie]

To what path?

[apostasie]

ah - you mean, in case getwd does NOT error, right?

Honestly, I would rather focus efforts on re-exec-ing instead of tweaking nsenter.

[djdongjin]

LGTM, thanks

[AkihiroSuda]

Thanks