Quoting Bryan Drewery <bdrew...@freebsd.org> (from Fri, 2 Sep 2016 15:51:56 -0700):

The error message is obvious, it tries to create a hardlink which is off
course not possible when src and dest of the link are on different FS.

My goal of an easy procedure (installworld into target datasets) doesn't
work like this off course. Do we have an easy way of telling
installworld to create symlinks instead of hardlinks, or alternatively a
way to tell to copy instead of doing a hardlink if the install hits the
cross-device case?

Maybe falling back to symlink could be done.

A copy-in-cross-fs-case would be the best solution, this way you don't need to care about having the right path (DESTDIR comes into the game here) specified on the comman line.

Couldn't you just make a usr-bin dataset and have usr-bin/bin and
usr-bin/sbin and symlink or nullfs-mount them in though?  I too go crazy
with datasets, but this seems a bit too much.

iocage is doing read-only zfs-clones of the datasets from the basejail location to the real jail location. I was hoping for a solution where I don't have to hack the inner workings of iocage. Additionally "copy in case of cross-fs case" looks like a useful feature in general.

My current (idea for a) workaround is "make -i installworld" and to copy the which failed. This is not clean, but looks less intrusive than introducing a new way (null-mounts) in iocage.


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