[BUG] Docker mount namespace procfs /proc/PID/root [fd error]: Could not retrieve current directory about fd

[tavianator]

This is a case where getcwd() fails to get the absolute path to the current directory. You can also get into this situation by calling chroot() without chdir().

$ strace --trace=getcwd fd
getcwd("(unreachable)/", 1024)          = 15

I think we should fix fd to not require the absolute path to the cwd, but I'm not sure how hard that would be. As a band-aid for this particular case, we could try to use the environment variable PWD as a fallback if getcwd() fails.

[danielzgtg]

Me using bash, your solution should work.

However, a slightly academic case is non-POSIX compliant shells like pwsh that leave PWD stale. eza and find still work without getcwd() and $PWD, If it comes to that case, we could just gracefully degrade and skip the ensure_current_directory_exists and strip_current_dir stuff.