The documentation is still working its way through...
https://manpages.debian.org/unstable/manpages-dev/fsopen.2.en.html
I complained that linux didn't have mountat() and somebody said
fsopen+fsconfig+fsmount+move_mount was the way to do that and pointed me
at the above (pending) man page. I'm wondering if unshare or switch_root
or something should use that. (2026-7=2019. I dunno how long glibc/musl
took to trail the kernel here, and then distro releases, but it's been
in the kernel's git repo for 7 years anyway...)
Rob
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