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build_library: retry losetup up to 10 seconds

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Sometimes we see such failures during Jenkins runs.

```
losetup: /mnt/host/source/tmp/...../disk_image.bin: failed to set up loop device: Resource temporarily unavailable
```

It's really hard to know which race condition it is.

To workaround it, in case that losetup fails, make it retry up to 10
seconds, once in every second. That could reduce the number of the
loopback device errors in the build chain.

Inspired by https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/264063/
This commit is contained in:
Dongsu Park 2019-06-27 16:12:59 +02:00
parent 120197fd57
commit ffeca193c0
1 changed files with 16 additions and 9 deletions
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25
build_library/disk_util
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@ -11,6 +11,7 @@ import re
import subprocess
import sys
import tempfile
import time
import uuid
# First sector we can use.
@ -433,17 +434,23 @@ def FormatFat(part, device):
def PartitionLoop(options, partition):
"""Allocate (and automatically free) loop devices for a partition."""
loop_dev = subprocess.check_output(['sudo', 'losetup',
'--offset', str(partition['first_byte']),
'--sizelimit', str(partition['bytes']),
'--find', '--show', options.disk_image])
loop_dev = loop_dev.strip()
attempts = 0
try:
yield loop_dev
finally:
Sudo(['losetup', '--detach', loop_dev])
while attempts < 10:
try:
loop_dev = subprocess.check_output(['sudo', 'losetup',
'--offset', str(partition['first_byte']),
'--sizelimit', str(partition['bytes']),
'--find', '--show', options.disk_image])
loop_dev = loop_dev.strip()
yield loop_dev
except:
attempts += 1
time.sleep(1)
finally:
Sudo(['losetup', '--detach', loop_dev])
def FormatPartition(options, part):
print "Formatting partition %s (%s) as %s" % (