| Commit message (Collapse) | Author | Age | Files | Lines |
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These are useful for Debian since they keep the tarball unpacked
in git.
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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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Returns the size of a file. You can already do this with 'stat',
but this call is good for scripting.
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This allows you to save the errno from a previous call and
pass it to reply_with_perror.
For example, original code:
r = some_system_call ();
err = errno;
do_cleanup ();
errno = err;
if (r == -1) {
reply_with_perror ("failed");
return -1;
}
can in future be changed to:
r = some_system_call ();
err = errno;
do_cleanup ();
if (r == -1) {
reply_with_perror_errno (err, "failed");
return -1;
}
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This just ensures that we accurately report errors, even if our
error path code doesn't set errno. We won't end up with a bogus
errno left over from a previous call.
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These functions are not available on Windows.
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Instead of doing a recursive call into the src/ directory to build
the object files, hard link the source files into the daemon
directory and build them separately.
See:
http://www.redhat.com/archives/libguestfs/2009-November/msg00254.html
Thanks to Jim Meyering for noticing a typo in the original version.
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PortableXDR didn't support xdr_uint32_t. xdr_u_int is the same type.
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At the time of writing Gnulib didn't support Win32 for its
fsusage API. Therefore this patch uses GetDiskFreeSpaceEx
if it's available (on Windows) otherwise falls back to using
Gnulib fsusage.
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This makes no functional change to the code. It just moves the
statvfs-related code out of daemon/stat.c into a new file called
daemon/statvfs.c.
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Instead of checking for futimens support and falling back
(incorrectly in one case) to using futimes, use gnulib's
module.
However the gnulib module does not yet support Win32, so
this change is only really useful on platforms like RHEL 5.
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Replace calls to sync() with calls to sync_disks() which supports
Win32 via FlushFileBuffers.
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If the posix_fallocate function is not available [ie. Windows]
use an alternate implementation that just loops and writes.
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Breaks compilation on Windows.
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Bug fix - the return value from this function was wrong
in the no-Augeas case.
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The current groups are defined very conservatively using the
following criteria:
(a) Would be impossible to implement on Windows because of
sheer architectural differences (eg: mknod).
(b) Already optional (augeas, inotify).
(c) Not currently optional but not implemented on older RHEL and
Debian releases (ntfs-3g.probe, scrub, zerofree).
The optional groups I've defined according to these criteria are:
. augeas
. inotify
. linuxfsuuid
. linuxmodules
. linuxxattrs
. lvm2
. mknod
. ntfs3g
. scrub
. selinux
. zerofree
(Note that these choices don't prevent us from adding more
optional groups in future. On the other hand to avoid breaking
ABIs we would not wish to change the above groups).
The rest of this large commit is really just implementation:
Each optional function is classified using Optional "group"
flag in the generator.
The daemon has to implement a function
int optgroup_<name>_available (void);
for each optional group. Some of these functions are fixed at
compile time, and some do simple run-time tests.
The do_available implementation in the daemon looks up the correct
function in a table and runs it.
We document the optional groups in the guestfs(3) man page.
Also: I added a NOT_AVAILABLE macro in order to unify all the
existing places where we had a message equivalent to
"function __func__ is not available".
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Start a new API allowing groups of functions to be tested for
availability.
There are two reasons for this:
(1) If libguestfs is built with missing dependencies (eg. no Augeas lib)
then the corresponding functions are disabled in the appliance. Up till
now there has been no way to test for this except to speculatively
issue commands and check for errors.
(2) When we port the daemon to Win32 it is likely that major pieces of
functionality won't be available (eg. LVM support). This API gives
a way to test for that.
There is no change for existing clients: you still have to check for
errors from individual API calls.
For new clients, you will be able to test for availability of particular
APIs.
Usage scenario (A): An LVM editing tool which requires
both the LVM API and inotify in order to function at all:
char *apis[] = { "inotify", "lvm2", NULL };
r = guestfs_available (g, apis);
if (r == -1) {
/* print an error and exit */
}
Usage scenario (B): A general purpose tool which optionally provides
configuration file editing, but this can be disabled, the result
merely being reduced functionality:
char *apis[] = { "augeas", NULL };
r = guestfs_available (g, apis);
enable_config_edit_menus = r == 0;
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Convert all uses automatically, via these two commands:
git grep -l '\<exit *(1)' \
| grep -vEf .x-sc_prohibit_magic_number_exit \
| xargs --no-run-if-empty \
perl -pi -e 's/\b(exit ?)\(1\)/$1(EXIT_FAILURE)/'
git grep -l '\<exit *(0)' \
| grep -vEf .x-sc_prohibit_magic_number_exit \
| xargs --no-run-if-empty \
perl -pi -e 's/\b(exit ?)\(0\)/$1(EXIT_SUCCESS)/'
* .x-sc_prohibit_magic_number_exit: New file.
Edit (RWMJ): Don't change Java code.
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* daemon/realpath.c: Don't include "openat.h". not used.
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