def copyToImage(dstImgPath, methodArgs):
totalSize = getLengthFromArgs(methodArgs)
fileObj = methodArgs['fileObj']
# Unlike copyFromImage, we don't use direct I/O when writing because:
# - Images are small so using host page cache is ok.
# - Images typically aligned to 512 bytes (tar), may fail on 4k storage.
cmd = [
constants.EXT_DD,
"of=%s" % dstImgPath,
"bs=%s" % MiB,
# Ensure that data reach physical storage before returning.
"conv=fsync",
]
log.info("Copy to image %s", dstImgPath)
with utils.stopwatch("Copy %s bytes" % totalSize,
level=logging.INFO,
log=log):
p = commands.start(cmd, stdin=subprocess.PIPE, stderr=subprocess.PIPE)
with commands.terminating(p):
_copyData(fileObj, p.stdin, totalSize)
try:
_, err = p.communicate(timeout=WAIT_TIMEOUT)
except subprocess.TimeoutExpired:
log.error("timeout waiting for dd process")
raise se.StorageException()
if p.returncode != 0:
log.error("dd failed rc=%s err=%r", p.returncode, err)
raise se.MiscFileWriteException()
def copyToImage(dstImgPath, methodArgs):
totalSize = getLengthFromArgs(methodArgs)
fileObj = methodArgs['fileObj']
cmd = [constants.EXT_DD, "of=%s" % dstImgPath, "bs=%s" % constants.MEGAB]
p = commands.execCmd(cmd, sync=False)
with utils.terminating(p):
_copyData(fileObj, p.stdin, totalSize)
p.stdin.close()
if not p.wait(WAIT_TIMEOUT):
log.error("timeout waiting for dd process")
raise se.StorageException()
if p.returncode != 0:
log.error("dd error - code %s, stderr %s", p.returncode,
p.stderr.read(1000))
raise se.MiscFileWriteException()