iotests.py: Add qemu_nbd_early_pipe()
qemu_nbd_pipe() currently unconditionally reads qemu-nbd's output. That is not ideal because qemu-nbd may keep stderr open after the parent process has exited. Currently, the only user of qemu_nbd_pipe() is 147, which discards the whole output if the parent process returned success and only evaluates it on error. Therefore, we can replace qemu_nbd_pipe() by qemu_nbd_early_pipe() that does the same: Discard the output on success, and return it on error. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20190508211820.17851-3-mreitz@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com>
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@ -24,7 +24,7 @@ import socket
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import stat
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import stat
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import time
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import time
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import iotests
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import iotests
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from iotests import cachemode, imgfmt, qemu_img, qemu_nbd, qemu_nbd_pipe
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from iotests import cachemode, imgfmt, qemu_img, qemu_nbd, qemu_nbd_early_pipe
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NBD_PORT_START = 32768
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NBD_PORT_START = 32768
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NBD_PORT_END = NBD_PORT_START + 1024
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NBD_PORT_END = NBD_PORT_START + 1024
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@ -93,7 +93,7 @@ class QemuNBD(NBDBlockdevAddBase):
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pass
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pass
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def _try_server_up(self, *args):
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def _try_server_up(self, *args):
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status, msg = qemu_nbd_pipe('-f', imgfmt, test_img, *args)
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status, msg = qemu_nbd_early_pipe('-f', imgfmt, test_img, *args)
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if status == 0:
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if status == 0:
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return True
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return True
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if 'Address already in use' in msg:
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if 'Address already in use' in msg:
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@ -209,9 +209,9 @@ def qemu_nbd(*args):
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'''Run qemu-nbd in daemon mode and return the parent's exit code'''
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'''Run qemu-nbd in daemon mode and return the parent's exit code'''
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return subprocess.call(qemu_nbd_args + ['--fork'] + list(args))
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return subprocess.call(qemu_nbd_args + ['--fork'] + list(args))
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def qemu_nbd_pipe(*args):
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def qemu_nbd_early_pipe(*args):
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'''Run qemu-nbd in daemon mode and return both the parent's exit code
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'''Run qemu-nbd in daemon mode and return both the parent's exit code
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and its output'''
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and its output in case of an error'''
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subp = subprocess.Popen(qemu_nbd_args + ['--fork'] + list(args),
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subp = subprocess.Popen(qemu_nbd_args + ['--fork'] + list(args),
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stdout=subprocess.PIPE,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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stderr=subprocess.STDOUT,
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@ -221,7 +221,10 @@ def qemu_nbd_pipe(*args):
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sys.stderr.write('qemu-nbd received signal %i: %s\n' %
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sys.stderr.write('qemu-nbd received signal %i: %s\n' %
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(-exitcode,
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(-exitcode,
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' '.join(qemu_nbd_args + ['--fork'] + list(args))))
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' '.join(qemu_nbd_args + ['--fork'] + list(args))))
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return exitcode, subp.communicate()[0]
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if exitcode == 0:
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return exitcode, ''
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else:
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return exitcode, subp.communicate()[0]
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def compare_images(img1, img2, fmt1=imgfmt, fmt2=imgfmt):
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def compare_images(img1, img2, fmt1=imgfmt, fmt2=imgfmt):
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'''Return True if two image files are identical'''
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'''Return True if two image files are identical'''
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