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runqemu: keep generating tap devices

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in case there is no tap device the script tries to
generate a new one.
The new device is then unguarded for a moment, so
the newly generated device could be acquired
by a different instance or user, before it is locked to
the instance with acquire_taplock.
To fix that keep generating new tap devices in case
the lock can't be acquired up to 5 times.
If no tap device can be locked it fails in the existing
error handling

(From OE-Core rev: 23876576d054ebbab9b02c0012782aa56feda123)

(From OE-Core rev: 5215635442949a62f502e839ddf1f12e790e5e37)

Signed-off-by: Konrad Weihmann <kweihmann@outlook.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
This commit is contained in:
Konrad Weihmann 2024-09-21 10:04:42 +00:00 committed by Steve Sakoman
parent 065bd86349
commit 6ee7342411
1 changed files with 14 additions and 10 deletions
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24
scripts/runqemu
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@ -1150,16 +1150,20 @@ to your build configuration.
uid = os.getuid()
logger.info("Setting up tap interface under sudo")
cmd = ('sudo', self.qemuifup, str(uid), str(gid), self.bindir_native)
try:
tap = subprocess.check_output(cmd).decode('utf-8').strip()
except subprocess.CalledProcessError as e:
logger.error('Setting up tap device failed:\n%s\nRun runqemu-gen-tapdevs to manually create one.' % str(e))
sys.exit(1)
lockfile = os.path.join(lockdir, tap)
self.taplock = lockfile + '.lock'
self.acquire_taplock()
self.cleantap = True
logger.debug('Created tap: %s' % tap)
for _ in range(5):
try:
tap = subprocess.check_output(cmd).decode('utf-8').strip()
except subprocess.CalledProcessError as e:
logger.error('Setting up tap device failed:\n%s\nRun runqemu-gen-tapdevs to manually create one.' % str(e))
sys.exit(1)
lockfile = os.path.join(lockdir, tap)
self.taplock = lockfile + '.lock'
if self.acquire_taplock():
self.cleantap = True
logger.debug('Created tap: %s' % tap)
break
else:
tap = None
if not tap:
logger.error("Failed to setup tap device. Run runqemu-gen-tapdevs to manually create.")