mergemaster failing with read-only /usr/src

[Jilles Tjoelker]

On Sun, May 03, 2015 at 02:03:49PM +0200, Wolfgang Zenker wrote:
> I'm trying to update this system:
> FreeBSD pomona 11.0-CURRENT FreeBSD 11.0-CURRENT #0: Mon Apr 13 03:48:04 CEST 2015     wolfgang at pomona:/usr/obj/usr/src/sys/UBQTERL  mips

> Source for that was probably from about April 11th. I sucessfully built
> world and kernel, ran mergemaster -p and make installworld on rev 282299
> but then mergemaster fails with:

> # mergemaster -iFU

> *** Creating the temporary root environment in /var/tmp/temproot
>  *** /var/tmp/temproot ready for use
>  *** Creating and populating directory structure in /var/tmp/temproot

> /bin/sh: cannot create routing_test.tmp: Read-only file system

>   *** FATAL ERROR: Cannot 'cd' to /usr/src and install files to
>       the temproot environment

> Filesystems are mounted like this:
> # mount
> /dev/da0s2a on / (ufs, local, noatime)
> devfs on /dev (devfs, local, multilabel)
> /dev/da0s1 on /boot (msdosfs, local)
> vulcan.lyx:/usr/src11 on /usr/src (nfs, read-only)
> vulcan.lyx:/var/obj/11/mips64 on /usr/obj (nfs)

> This used to work before. Any ideas, any further info I could provide?

This broke after a test was added for etc/rc.d/. Without special code,
this causes these tests to be built and installed as part of
mergemaster/etcmerge, like other parts of etc.

As a workaround you can do:
  echo make -C etc obj all | make buildenv
on the build machine after make buildworld. Then mergemaster will work,
even with a read-only /usr/obj.

-- 
Jilles Tjoelker