On Wed, 13 Nov 2024 at 09:55:43 +0000, Mark Hindley wrote:
> In version 21.1.14-2 of src:xorg-server, the new compile time Xvfb check fails
> in a pbuilder/cowbuilder chroot:
>
> sudo cowbuilder --build --basepath /var/cache/pbuilder/base-sid.cow/
> xorg-server_21.1.14-2.dsc
...
> # Check basic functionality of Xvfb
> PATH="debian/build/main/hw/vfb:$PATH" sh debian/local/xvfb-run -a -e
> /proc/self/fd/2 -s -noreset xdpyinfo
> debian/local/xvfb-run: 159: cannot create /proc/self/fd/2: Permission denied
> debian/local/xvfb-run: 82: cannot create /proc/self/fd/2: Permission denied
Does pbuilder not make /proc available in the usual way, or mount it with
unusual/restrictive options, or something like that?
It would be possible to work around this by letting Xvfb's stderr go
to the default /dev/null, or by adding a special case that detects the
path /proc/self/fd/2 or /dev/stderr and using >&2 in this case, but I
would really prefer to be able to treat a normally-functioning /proc as
"part of the API" that we expect from any reasonable build environment.
Several packages that use xvfb-run for their test suites are also using
"-e /proc/self/fd/2" to make Xvfb failures like #1082659 a bit more
feasible to debug, so they will also FTBFS in pbuilder/cowbuilder
until/unless this can be addressed somehow.
smcv
