There is a nasty race condition in the code, which is easily fixed:
--- /usr/share/pyshared/VMBuilder/util.py.orig 2010-06-10 17:20:58.000000000
+0000
+++ /usr/share/pyshared/VMBuilder/util.py 2014-06-19 10:57:09.723017475
+0000
@@ -108,9 +108,12 @@
mystdout = NonBlockingFile(proc.stdout, logfunc=logging.debug)
mystderr = NonBlockingFile(proc.stderr, logfunc=(ignore_fail and
logging.debug or logging.info))
- while not (mystdout.closed and mystderr.closed):
+ while True:
+ fdset = [x.file for x in [mystdout, mystderr] if not x.closed]
+ if not fdset:
+ break
# Block until either of them has something to offer
- fds = select.select([x.file for x in [mystdout, mystderr] if not
x.closed], [], [])[0]
+ fds = select.select(fdset, [], [])[0]
for fp in [mystderr, mystdout]:
if fp.file in fds:
fp.process_input()
Unfortunately that doesn't fix the problem :-(
Adding debugging shows that mystdout remains open, but does not show
ready to read from select().
Oddly, it seems that mystderr.closed becomes true almost immediately
after starting debootstrap.
2014-06-19 11:16:11,884 DEBUG : Calling bootstrap method in context plugin
VMBuilder.plugins.ubuntu.distro.
2014-06-19 11:16:11,884 DEBUG : ['/usr/sbin/debootstrap', '--arch=i386',
'trusty', '/tmp/tmpBQAxhc',
'http://apt.ws.nsrc.org:3142/archive.ubuntu.com/ubuntu']
*** Starting ['/usr/sbin/debootstrap', '--arch=i386', 'trusty',
'/tmp/tmpBQAxhc', 'http://apt.ws.nsrc.org:3142/archive.ubuntu.com/ubuntu'] ***
mystdout=<VMBuilder.util.NonBlockingFile object at 0x7fcade825550>, closed=False
mystderr=<VMBuilder.util.NonBlockingFile object at 0x7fcade825610>, closed=False
fdset=[<open file '<fdopen>', mode 'rb' at 0x7fcadea726f0>, <open file
'<fdopen>', mode 'rb' at 0x7fcadea72780>]
selecting...
fds=[<open file '<fdopen>', mode 'rb' at 0x7fcadea72780>]
mystdout=<VMBuilder.util.NonBlockingFile object at 0x7fcade825550>, closed=False
mystderr=<VMBuilder.util.NonBlockingFile object at 0x7fcade825610>, closed=True
fdset=[<open file '<fdopen>', mode 'rb' at 0x7fcadea726f0>]
selecting...
fds=[<open file '<fdopen>', mode 'rb' at 0x7fcadea726f0>]
It could be true that debootstrap closes stderr immediately of course.
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https://bugs.launchpad.net/bugs/1287943
Title:
vm-builder needs trusty suite
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