Test case I'm using is adding the following line to the hello package's
binary-arch target:
Xvfb :99
In particular, the fault is occurring within the X server code for the
xkbcomp call. The call it's trying to make is something like:
xkbcomp -w 1 -R/usr/share/X11/xkb/keymap -xkm xfree86 /var/lib/xkb
/server-foo.xkm
Error: Cannot open "/var/lib/xkb/server-foo.xkm" to write keyboard
description
Exiting
In natty, Xvfb runs properly because it uses /tmp/server-foo.xkm, which
it can write to. Indeed, the above xkbcomp call fails in called in
binary-arch rules, but simply changing to /tmp succeeds:
xkbcomp -w 1 -R/usr/share/X11/xkb/keymap -xkm xfree86 /var/lib/xkb
/server-foo.xkm
The code in question that decides what directory to use is
xserver/xkb/ddxLoad.c:
tatic void
OutputDirectory(
char* outdir,
size_t size)
{
#ifndef WIN32
/* Can we write an xkm and then open it too? */
if (access(XKM_OUTPUT_DIR, W_OK | X_OK) == 0 && (strlen(XKM_OUTPUT_DIR) <
size))
{
(void) strcpy (outdir, XKM_OUTPUT_DIR);
} else
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https://bugs.launchpad.net/bugs/829470
Title:
Xvfb fails with empty /var/lib/xkb, causing build failures
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