libjail: fix handling of allow.mount.fusefs in jailparam_init

[asomers]

Summary

libjail: fix handling of allow.mount.fusefs in jailparam_init

fusefs is inconsistently named. The kernel module is named "fuse", but the
mount helper is named "mount_fusefs" and the jail(8) parameter is named
"allow.mount.fusefs". Special case it in libjail.

Test Plan

Tested by hand on head. Started a jail with allow.mount.fusefs=1 and fuse(4)
not loaded. Relied on libjail to kldload fuse.

[jamie]

It works with allow.mount.fusefs, but not with allow.mount.nofusefs (which will still try to kldload "fusefs"). Comparing the fs name to both "fusefs" and "nofusefs" should be all that's needed.

[asomers]

Of course, stupid me. But I'm having trouble testing it. What's the proper way to pass the "nofuse" option on the jail(8) command line? Neither allow.mount.nofusefs nor allow.mount.nofusefs=1 work.

[jamie]

It's allow.mount.nofusefs. It should (currently) work once the kld is loaded, but the new strcmp will need to be added to make it work before it's loaded.

lib/libjail/jail.c

1055

This only needs to be a strcmp, since "fusefs" is at the end of the parameter name.

[asomers]

Handle allow.mount.nofusefs too