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These APIs allow you to efficiently write and read parts of
files or devices.
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During a FileIn command (eg. upload, tar-in) if both sides
experience errors, then both sides could send cancel messages,
the result being lost synchronization.
The reason for the lost synch was because the daemon was ignoring
this case and sending an error message back which the library side
(which had cancelled) was not expecting.
Fix this by checking in the daemon for the case where the library
also cancels during daemon cancellation, and not sending an error
messages.
This also includes an enhanced regression test which checks for this
case.
This extends the original fix in
commit 5922d7084d6b43f0a1a15b664c7082dfeaf584d0.
More details can be found here:
https://bugzilla.redhat.com/show_bug.cgi?id=576879#c5
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Modify the generator so that it can correctly handle early
cancellation for Pathname|Device|.. parameters. This fixes
the upload command, but consequently we need to fix the
parameters for tar_in and t?z_in commands. This should also
mean that 'win:' can now be used as the second argument of
tar_in and t?z_in commands in guestfish, whereas previously
this wouldn't have worked.
Adds a regression test for the original problem.
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This includes various code cleanups:
(a) A regression test for RHBZ#580246.
(b) Use write instead of fwrite to write out the tar file. This is
just because the error handling of write seems to be better
specified and easier to use.
(c) Use size_t instead of int for length.
(d) Clearer debug messages when in verbose mode.
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The problem was this sequence of events:
(1) File transfer goes through OK.
(2) pclose returns failure (because 'tar' subprocess failed)
(3) We try to cancel the transfer by calling cancel_receive.
Step (3) fails because the transfer (as far as the library is
concerned) has succeeded, so causing a hang.
The more fundamental reason why we see steps (1) and (2) is that
'tar' does NOT fail immediately if there is a write error. Instead
it continues reading and discarding the input until the end of the
input before giving "Error exit delayed from previous errors".
IMHO this is a bug with tar, since an ENOSPC write error should
be fatal for tar.
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The RPC stubs already prefix the command name to error messages.
The daemon doesn't have to do this. As a (small) benefit this also
makes the daemon slightly smaller.
Code in the daemon such as:
if (argv[0] == NULL) {
reply_with_error ("passed an empty list");
return NULL;
}
now results in error messages like this:
><fs> command ""
libguestfs: error: command: passed an empty list
(whereas previously you would have seen ..command: command:..)
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git grep -l 'strncmp *([^=]*== *0'|xargs \
perl -pi -e 's/\bstrncmp( *\(.*?\)) *== *0\b/STREQLEN$1/g'
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* daemon/proto.c (send_chunk): Don't ignore socket-write error.
* daemon/proto.c (send_file_end): Return "int", not void,
so we can propagate send_chunk failure to caller.
* daemon/daemon.h (send_file_end): Update prototype.
* daemon/tar.c (do_tar_out, do_tgz_out): Update uses of send_file_end.
* daemon/upload.c (do_download): Likewise.
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* src/generator.ml: Update all rules to handle Dev_or_Path.
(the above changes to generator.ml are mostly mechanical)
Emit a use of REQUIRE_ROOT_OR_RESOLVE_DEVICE.
* daemon/upload.c (do_download): Remove use of
REQUIRE_ROOT_OR_RESOLVE_DEVICE, now that it's automatically done
in calling code.
* daemon/file.c (do_file): Likewise.
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Nearly every file-related function in daemons/*.c is affected:
Remove this pair of statements from each affected do_* function:
- NEED_ROOT (return -1);
- ABS_PATH (dir, return -1);
and change the type of the corresponding parameter to "const char *".
* src/generator.ml: Emit NEED_ROOT just once, even when there are two or
more Pathname args.
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Use this command:
git grep -l -w IS_DEVICE|xargs perl -pi -e \
's/\b(?:IS_DEVICE)\b( \(.*?,) (.*?)\)/RESOLVE_DEVICE$1 return $2)/'
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- don't leak the file descriptor along error paths
- can't use those macros in FileIn functions
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