qemu/tests/qemu-iotests/114.out

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QA output created by 114
qemu-io: Don't die on second open Most callback commands in qemu-io return 0 to keep the interpreter loop running, or 1 to quit immediately. However, open_f() just passed through the return value of openfile(), which has different semantics of returning 0 if a file was opened, or 1 on any failure. As a result of mixing the return semantics, we are forcing the qemu-io interpreter to exit early on any failures, which is rather annoying when some of the failures are obviously trying to give the user a hint of how to proceed (if we didn't then kill qemu-io out from under the user's feet): $ qemu-io qemu-io> open foo qemu-io> open foo file open already, try 'help close' $ echo $? 0 In general, we WANT openfile() to report failures, since it is the function used in the form 'qemu-io -c "$something" no_such_file' for performing one or more -c options on a single file, and it is not worth attempting $something if the file itself cannot be opened. So the solution is to fix open_f() to always return 0 (when we are in interactive mode, even failure to open should not end the session), and save the return value of openfile() for command line use in main(). Note, however, that we do have some qemu-iotests that do 'qemu-io -c "open file" -c "$something"'; such tests will now proceed to attempt $something whether or not the open succeeded, the same way as if the two commands had been attempted in interactive mode. As such, the expected output for those tests has to be modified. But it also means that it is now possible to use -c close and have a single qemu-io command line operate on more than one file even without using interactive mode. Although the '-c open' action is a subtle change in behavior, remember that qemu-io is for debugging purposes, so as long as it serves the needs of qemu-iotests while still being reasonable for interactive use, it should not be a problem that we are changing tests to the new behavior. This has been awkward since at least as far back as commit e3aff4f, in 2009. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2017-06-05 23:38:42 +03:00
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base
image: TEST_DIR/t.IMGFMT
file format: IMGFMT
virtual size: 64M (67108864 bytes)
cluster_size: 65536
backing file: TEST_DIR/t.IMGFMT.base
backing file format: foo
can't open device TEST_DIR/t.qcow2: Could not open backing file: Unknown driver 'foo'
qemu-io: Don't die on second open Most callback commands in qemu-io return 0 to keep the interpreter loop running, or 1 to quit immediately. However, open_f() just passed through the return value of openfile(), which has different semantics of returning 0 if a file was opened, or 1 on any failure. As a result of mixing the return semantics, we are forcing the qemu-io interpreter to exit early on any failures, which is rather annoying when some of the failures are obviously trying to give the user a hint of how to proceed (if we didn't then kill qemu-io out from under the user's feet): $ qemu-io qemu-io> open foo qemu-io> open foo file open already, try 'help close' $ echo $? 0 In general, we WANT openfile() to report failures, since it is the function used in the form 'qemu-io -c "$something" no_such_file' for performing one or more -c options on a single file, and it is not worth attempting $something if the file itself cannot be opened. So the solution is to fix open_f() to always return 0 (when we are in interactive mode, even failure to open should not end the session), and save the return value of openfile() for command line use in main(). Note, however, that we do have some qemu-iotests that do 'qemu-io -c "open file" -c "$something"'; such tests will now proceed to attempt $something whether or not the open succeeded, the same way as if the two commands had been attempted in interactive mode. As such, the expected output for those tests has to be modified. But it also means that it is now possible to use -c close and have a single qemu-io command line operate on more than one file even without using interactive mode. Although the '-c open' action is a subtle change in behavior, remember that qemu-io is for debugging purposes, so as long as it serves the needs of qemu-iotests while still being reasonable for interactive use, it should not be a problem that we are changing tests to the new behavior. This has been awkward since at least as far back as commit e3aff4f, in 2009. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2017-06-05 23:38:42 +03:00
no file open, try 'help open'
read 4096/4096 bytes at offset 0
4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
*** done