| Commit message (Collapse) | Author | Age | Files | Lines |
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Remove some debug messages which were basically left over from when
the code was being developed.
However we leave debug messages where it is printing an external
command that is about to be executed, since those are useful.
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These APIs are essentially required to work around a problem
with ntfs-3g. This filesystem (or FUSE?) does not list all
extended attributes of a file when you call listxattr(2). However
if you know the name of an extended attribute, you can retrieve
it directly using getxattr(2).
The current APIs (getxattrs etc) are simple to use, but they
don't work if we can't list out the extended attributes (ie.
by calling listxattr(2)).
Example using the new APIs on an ntfs-3g filesystem:
><fs> lgetxattr "/Documents and Settings" system.ntfs_attrib | hexdump -C
00000000 16 24 00 00 |.$..|
00000004
><fs> lgetxattr "/Documents and Settings" system.ntfs_reparse_data | hexdump -C
00000000 03 00 00 a0 34 00 00 00 00 00 18 00 1a 00 10 00 |....4...........|
00000010 5c 00 3f 00 3f 00 5c 00 43 00 3a 00 5c 00 55 00 |\.?.?.\.C.:.\.U.|
00000020 73 00 65 00 72 00 73 00 00 00 43 00 3a 00 5c 00 |s.e.r.s...C.:.\.|
00000030 55 00 73 00 65 00 72 00 73 00 00 00 |U.s.e.r.s...|
0000003c
><fs> getxattr "/Documents and Settings" system.ntfs_reparse_data | hexdump -C
libguestfs: error: getxattr: getxattr: No such file or directory
><fs> getxattr "/Documents and Settings" system.ntfs_attrib | hexdump -C
libguestfs: error: getxattr: getxattr: No such file or directory
><fs> lgetxattr "/Documents and Settings" system.ntfs_attrib | hexdump -C
00000000 16 24 00 00 |.$..|
00000004
><fs> getxattr "/Users" system.ntfs_attrib | hexdump -C
00000000 11 00 00 00 |....|
00000004
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This file is already hard-linked into the current directory, so
the relative path is not required.
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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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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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git grep -l 'strcmp *([^=]*!= *0'|xargs \
perl -pi -e 's/\bstrcmp( *\(.*?\)) *!= *0\b/STRNEQ$1/g'
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git grep -l 'strcmp *([^=]*== *0'|xargs \
perl -pi -e 's/\bstrcmp( *\(.*?\)) *== *0/STREQ$1/g'
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These three functions are very specifically designed for FUSE
support, so we can list directories efficiently. Instead of
making lots of lstat, lgetxattr and readlink calls, we can make just
three calls per directory to grab all the attributes (which we
then cache briefly).
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* daemon/xattr.c (getxattrs): Use an unsigned index.
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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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run this command:
git grep -l -w NEED_ROOT|xargs perl -pi -e \
's/(NEED_ROOT) \((.*?)\)/$1 (return $2)/'
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run this command:
git grep -l -w ABS_PATH|xargs perl -pi -e \
's/(?:ABS_PATH)( \(.*?,) (.*?)\)/ABS_PATH$1 return $2)/'
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Do it by running this command:
[exempted files are matched via .x-sc_TAB_in_indentation]
git ls-files \
| pcregrep -vf .x-sc_TAB_in_indentation \
| xargs pcregrep -l '^ *\t' \
| xargs perl -MText::Tabs -ni -le \
'$m=/^( *\t[ \t]*)(.*)/; print $m ? expand($1) . $2 : $_'
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This commit adds six calls to support Linux extended attributes.
They are:
getxattrs list all extended attributes for a file or directory
setxattr add/replace an extended attribute
removexattr remove an extended attribute
lgetxattrs \
lsetxattr (same as above, but operate on symbolic links)
lremovexattr /
See attr(5) for more information.
This also adds support for the FBuffer field type, which maps to
an XDR opaque<> or a C (int, char *) pair.
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