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Bug 690778

Summary: virtualx.eclass: no display for an emerge following a failure
Product: Gentoo Linux Reporter: Chris Mayo <aklhfex>
Component: EclassesAssignee: Gentoo X packagers <x11>
Status: RESOLVED FIXED    
Severity: normal    
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: All   
Whiteboard:
Package list:
Runtime testing required: ---
Attachments: patch to virtualx.eclass

Description Chris Mayo 2019-07-26 18:53:29 UTC
Created attachment 584740 [details, diff]
patch to virtualx.eclass

If using GNOME GDM, X is started on DISPLAY :0 but a lock file
/tmp/.X1024-lock is created instead of /tmp/.X0-lock.
virtx() will initially set XDISPLAY to 0 and attempt to start Xvfb on DISPLAY :0 which fails but DISPLAY :1 (and greater) is not attempted if a previous emerge
left /tmp/.X1-lock behind.

A simple patch that works around this for me is attached - starting the search for a DISPLAY at :1.

The other problem that exposed this is that the lock files are not being removed. This patch allows you to keep testing but does result in lock files accumulating.
Comment 1 Larry the Git Cow gentoo-dev 2019-07-30 01:49:53 UTC
The bug has been closed via the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=6f680e4fe73925ae130343e02adb416cb799ce7d

commit 6f680e4fe73925ae130343e02adb416cb799ce7d
Author:     Chris Mayo <aklhfex@gmail.com>
AuthorDate: 2019-07-26 18:48:13 +0000
Commit:     Matt Turner <mattst88@gentoo.org>
CommitDate: 2019-07-30 01:49:41 +0000

    virtualx.eclass: Fix no display for an emerge following a failure
    
    If using GNOME GDM, X is started on DISPLAY :0 but a lock file
    /tmp/.X1024-lock is created instead of /tmp/.X0-lock.
    virtx() will initially set XDISPLAY to 0 and attempt to start Xvfb on
    DISPLAY :0 which fails but DISPLAY :1 (and greater) is not attempted if
    a previous emerge left /tmp/.X1-lock behind.
    
    Closes: https://bugs.gentoo.org/690778
    Signed-off-by: Chris Mayo <aklhfex@gmail.com>
    Signed-off-by: Matt Turner <mattst88@gentoo.org>

 eclass/virtualx.eclass | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)