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Type:
Bug
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Resolution: Unresolved
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Priority:
Major
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Component/s: vncviewer-plugin
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None
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Environment:RHEL7, Jenkins 2.30 and 2.66, latest version of the plugin
The behavior of the /bin/vncserver script has changed in RHEL7: When it checks for a display to start VNC on, the code has changed:
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- On RHEL6, when it finds that the first display in the free list is used, it dies
- On RHEL7, when it finds that the first display in the free list is used, it starts looking at display :1, bypassing the free list.
Here's the original code on RHEL7:
Find display number.
if ((@ARGV > 0) && ($ARGV[0] =~ /^:(\d+)$/)) {
$displayNumber = $1;
shift(@ARGV);
if (!&CheckDisplayNumber($displayNumber)) {
warn "A VNC server is already running as :$displayNumber\n";
$displayNumber = &GetDisplayNumber();
}
} elsif ((@ARGV > 0) && ($ARGV[0] !~ /^-/) && ($ARGV[0] !~ /^\+/)) {
&Usage();
} else {
$displayNumber = &GetDisplayNumber();
}
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Here is what we did to get it to work correctly:
Find display number.
if ((@ARGV > 0) && ($ARGV[0] =~ /^:(\d+)$/)) {
$displayNumber = $1;
shift(@ARGV);
if (!&CheckDisplayNumber($displayNumber)) {
die "A VNC server is already running as :$displayNumber\n";
# warn "A VNC server is already running as :$displayNumber\n";
# $displayNumber = &GetDisplayNumber();
}
} elsif ((@ARGV > 0) && ($ARGV[0] !~ /^-/) && ($ARGV[0] !~ /^\+/)) {
&Usage();
} else {
$displayNumber = &GetDisplayNumber();
}
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Here's the equivalent code for RHEL6:
if ((@ARGV > 0) && ($ARGV[0] =~ /^:(\d+)$/)) {
$displayNumber = $1;
shift(@ARGV);
if (!&CheckDisplayNumber($displayNumber)) {
die "A VNC server is already running as :$displayNumber\n";
}
} elsif ((@ARGV > 0) && ($ARGV[0] !~ /^-/) && ($ARGV[0] !~ /^\+/)) {
&Usage();
} else {
$displayNumber = &GetDisplayNumber();
}
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