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swtpm: wait for pidfile

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swtpm may take a little bit to daemonize, so the pidfile might not be
available right after run_command. Causes an ugly warning about using an
undefined value in a match, so wait up to 5s for it to appear.

Note that in testing this loop only ever got to the first or second
iteration, so I believe the timeout duration should be more than enough.

Also add a missing 'usleep' import, 'usleep' was used before but never
imported, apparently the other case never got triggered...

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
This commit is contained in:
Stefan Reiter 2021-10-14 11:28:49 +02:00 committed by Thomas Lamprecht
parent 9d83932d7c
commit f85951dc82
1 changed files with 9 additions and 1 deletions
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10
PVE/QemuServer.pm
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@ -22,7 +22,7 @@ use JSON;
use MIME::Base64;
use POSIX;
use Storable qw(dclone);
use Time::HiRes qw(gettimeofday);
use Time::HiRes qw(gettimeofday usleep);
use URI::Escape;
use UUID;
@ -3058,6 +3058,14 @@ sub start_swtpm {
push @$emulator_cmd, "--tpm2" if $tpm->{version} eq 'v2.0';
run_command($emulator_cmd, outfunc => sub { print $1; });
# swtpm may take a bit to start before daemonizing, wait up to 5s for pid
my $tries = 100;
while (! -e $paths->{pid}) {
usleep(50000);
die "failed to start swtpm: pid file '$paths->{pid}' wasn't created.\n"
if --$tries == 0;
}
# return untainted PID of swtpm daemon so it can be killed on error
file_read_firstline($paths->{pid}) =~ m/(\d+)/;
return $1;