Re: unlink on NFS volume fails silently

[Markus Wichmann <nullplan@gmx.net>]

Am Sun, Jul 06, 2025 at 04:25:31PM +1000 schrieb Stephen Von Takach:
> Hi,
> 
> We recently had to move a service from being built on alpine linux to
> debian linux as we were getting silent failures when deleting a directory
> with many files on an NFS volume. Basically this call to unlink was not
> raising an error if the file failed to delete
> https://github.com/crystal-lang/crystal/blob/master/src/crystal/system/unix/file.cr#L129
> 
> We replicated the issue in an alpine container with rm -rf
> /nfs_mount/git_repo_to_delete and it also failed to successfully delete all
> the files, it did raise an error though (I assume it checked the file was
> removed before continuing) not entirely sure.
> 
> Both these operations succeed with glibc when using debian.
> Looks a bit like this issue:
> https://gitlab.alpinelinux.org/alpine/aports/-/issues/10960
> 

Neither unlink() nor readdir() are appreciably different between musl
and glibc, so I don't know what is going on. Could you strace the test
cases to see where the differences are?

Ciao,
Markus