I'm running Xvfb on an Elastic Bamboo Ubuntu instance (AMI ami-bba0fede, Ubuntu 15.04), like explained in the docs. It works if I just do the DISPLAY= and run Xvfb directly.
But I'd like to use the xvfb-run wrapper script (/usr/bin/xvfb-run, part of the Xvfb package) instead - it picks a free display, so you can run multiple tests on the same system without them conflicting. If you just hardcode a display number then you can only run one at a time.
This works on Ubuntu in my local virtualbox but hangs on the Atlassian-provided AMI (both run from EB and also if I pull it up manually). It does work on a stock Canonical Ubunti AMI (ami-3ad5af50) so there has to be something specifically changed on the Elastic Bamboo instances that's breaking it.
Xvfb :99 -ac
pybot --nostatusrc --variablefile variables/vars.py -e TBD -e broken -x xunit -d reports/ tests/
<test output here>
This works on virtualbox but hangs on an instance created from the EB AMI (both by Bamboo and also if I just manually start one off the same AMI):
xvfb-run --server-args="-screen 0 1024x768x24" -a -e xvfb.log pybot --nostatusrc --variablefile variables/vars.py -
e TBD -e broken -x xunit -d reports/ tests/
I added a set -x to the /usr/bin/xvfb-run script to see what up and it hangs within xvfb-run while it's trying to find a clear display, before it gets to my code.
+ tempfile -n /tmp/xvfb-run.DJcsEj/Xauthority
+ [ 10 -gt 0 ]
+ XAUTHORITY=/tmp/xvfb-run.DJcsEj/Xauthority xauth source -
+ trap : USR1
+ trap USR1
+ exec Xvfb :99 -screen 0 1024x768x24 -nolisten tcp -auth /tmp/xvfb-run.DJcsEj/Xauthority
This is before my test code, it's basically a loop in xvfb-run that runs and tries to find a free display -
# Start Xvfb.
while [ $tries -gt 0 ]; do
tries=$(( $tries - 1 ))
XAUTHORITY=$AUTHFILE xauth source - << EOF >>"$ERRORFILE" 2>&1
add :$SERVERNUM $XAUTHPROTO $MCOOKIE
# handle SIGUSR1 so Xvfb knows to send a signal when it's ready to accept
trap : USR1
(trap '' USR1; exec Xvfb ":$SERVERNUM" $XVFBARGS $LISTENTCP -auth $AUTHFILE >>"$ERRORFILE" 2>&1) &
wait || :
if kill -0 $XVFBPID 2>/dev/null; then
elif [ -n "$AUTONUM" ]; then
# The display is in use so try another one (if '-a' was specified).
SERVERNUM=$((SERVERNUM + 1))
error "Xvfb failed to start" >&2
It hangs on that trap/exec line. My bash-fu isn't good enough to figure out why. Nothing appears in any log including the xvfb-run log if I configure one.
Is anyone else running xvfb-run successfully, or know what this issue might be?
Addition: I've learned that it's Xvfb behavior to send a SIGUSR1 back to the parent process if the child process disconnects, which is what the parent shell is wait-ing on. But that signal's either not getting sent or not getting received.
Solution: (why the heck can't you post an answer to your own question here?)
I found the issue. Atlassian adds a /usr/local/bin/Xvfb wrapper script that sets listen tcp. having another shell in between Xvfb and xvfb-run blocks the SIGUSR1 send. It also seems like a security hole to turn on tcp listen without you knowing, but eh. If anyone else is trying to use xvfb-run, just deleting their wrapper script will do the trick.
Don't have an answer for you, but I just want to let you know that in my experience, the images get updated without notice. I've had my company's build service taken out by Atlasssian image updates multiple times. I think if you can wait, file a support request. Otherwise, it's on you to figure out and fix
Right, I have logged a support ticket and am also working on figuring and fixing - hence asking here. I wonder if it works for people that have built their own elastic bamboo instance from the instructions as opposed to using the stock one?
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