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steamrt
steam-runtime-tools
Commits
f5399c83
Commit
f5399c83
authored
10 years ago
by
Colin Walters
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Import xattr reading code from libgsystem
parent
ba67dd39
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4 changed files
Makefile-libglnx.am
+4
-2
4 additions, 2 deletions
Makefile-libglnx.am
glnx-xattrs.c
+283
-0
283 additions, 0 deletions
glnx-xattrs.c
glnx-xattrs.h
+45
-0
45 additions, 0 deletions
glnx-xattrs.h
libglnx.h
+1
-0
1 addition, 0 deletions
libglnx.h
with
333 additions
and
2 deletions
Makefile-libglnx.am
+
4
−
2
View file @
f5399c83
...
...
@@ -26,11 +26,13 @@ libglnx_la_SOURCES = \
$(libglnx_srcpath)/glnx-errors.c \
$(libglnx_srcpath)/glnx-dirfd.h \
$(libglnx_srcpath)/glnx-dirfd.c \
$(libglnx_srcpath)/glnx-xattrs.h \
$(libglnx_srcpath)/glnx-xattrs.c \
$(libglnx_srcpath)/glnx-shutil.h \
$(libglnx_srcpath)/glnx-shutil.c \
$(libglnx_srcpath)/libglnx.h \
$(NULL)
libglnx_la_CFLAGS = $(AM_CFLAGS) $(libglnx_cflags)
libglnx_la_LDFLAGS = -avoid-version -Bsymbolic-functions -export-symbols-regex "^glnx_" -no-undefined -export-dynamic
libglnx_la_LIBADD = $(libglnx_libs)
libglnx_la_LDFLAGS = -avoid-version -Bsymbolic-functions -export-symbols-regex "^glnx_" -no-undefined -export-dynamic
libglnx_la_LIBADD = $(libglnx_libs)
-lattr
This diff is collapsed.
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glnx-xattrs.c
0 → 100644
+
283
−
0
View file @
f5399c83
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
*
* Copyright (C) 2014,2015 Colin Walters <walters@verbum.org>.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include
"config.h"
#include
<string.h>
#include
<stdio.h>
#include
<glnx-xattrs.h>
#include
<glnx-errors.h>
#include
<glnx-local-alloc.h>
static
GVariant
*
variant_new_ay_bytes
(
GBytes
*
bytes
)
{
gsize
size
;
gconstpointer
data
;
data
=
g_bytes_get_data
(
bytes
,
&
size
);
g_bytes_ref
(
bytes
);
return
g_variant_new_from_data
(
G_VARIANT_TYPE
(
"ay"
),
data
,
size
,
TRUE
,
(
GDestroyNotify
)
g_bytes_unref
,
bytes
);
}
static
char
*
canonicalize_xattrs
(
char
*
xattr_string
,
size_t
len
)
{
char
*
p
;
GSList
*
xattrs
=
NULL
;
GSList
*
iter
;
GString
*
result
;
result
=
g_string_new
(
0
);
p
=
xattr_string
;
while
(
p
<
xattr_string
+
len
)
{
xattrs
=
g_slist_prepend
(
xattrs
,
p
);
p
+=
strlen
(
p
)
+
1
;
}
xattrs
=
g_slist_sort
(
xattrs
,
(
GCompareFunc
)
strcmp
);
for
(
iter
=
xattrs
;
iter
;
iter
=
iter
->
next
)
{
g_string_append
(
result
,
iter
->
data
);
g_string_append_c
(
result
,
'\0'
);
}
g_slist_free
(
xattrs
);
return
g_string_free
(
result
,
FALSE
);
}
static
gboolean
read_xattr_name_array
(
const
char
*
path
,
int
fd
,
const
char
*
xattrs
,
size_t
len
,
GVariantBuilder
*
builder
,
GError
**
error
)
{
gboolean
ret
=
FALSE
;
const
char
*
p
;
int
r
;
const
char
*
funcstr
;
g_assert
(
path
!=
NULL
||
fd
!=
-
1
);
funcstr
=
fd
!=
-
1
?
"fgetxattr"
:
"lgetxattr"
;
p
=
xattrs
;
while
(
p
<
xattrs
+
len
)
{
ssize_t
bytes_read
;
char
*
buf
;
GBytes
*
bytes
=
NULL
;
if
(
fd
!=
-
1
)
bytes_read
=
fgetxattr
(
fd
,
p
,
NULL
,
0
);
else
bytes_read
=
lgetxattr
(
path
,
p
,
NULL
,
0
);
if
(
bytes_read
<
0
)
{
glnx_set_prefix_error_from_errno
(
error
,
"%s"
,
funcstr
);
goto
out
;
}
if
(
bytes_read
==
0
)
continue
;
buf
=
g_malloc
(
bytes_read
);
bytes
=
g_bytes_new_take
(
buf
,
bytes_read
);
if
(
fd
!=
-
1
)
r
=
fgetxattr
(
fd
,
p
,
buf
,
bytes_read
);
else
r
=
lgetxattr
(
path
,
p
,
buf
,
bytes_read
);
if
(
r
<
0
)
{
g_bytes_unref
(
bytes
);
glnx_set_prefix_error_from_errno
(
error
,
"%s"
,
funcstr
);
goto
out
;
}
g_variant_builder_add
(
builder
,
"(@ay@ay)"
,
g_variant_new_bytestring
(
p
),
variant_new_ay_bytes
(
bytes
));
p
=
p
+
strlen
(
p
)
+
1
;
g_bytes_unref
(
bytes
);
}
ret
=
TRUE
;
out:
return
ret
;
}
static
gboolean
get_xattrs_impl
(
const
char
*
path
,
GVariant
**
out_xattrs
,
GCancellable
*
cancellable
,
GError
**
error
)
{
gboolean
ret
=
FALSE
;
ssize_t
bytes_read
;
glnx_free
char
*
xattr_names
=
NULL
;
glnx_free
char
*
xattr_names_canonical
=
NULL
;
GVariantBuilder
builder
;
gboolean
builder_initialized
=
FALSE
;
g_autoptr
(
GVariant
)
ret_xattrs
=
NULL
;
g_variant_builder_init
(
&
builder
,
G_VARIANT_TYPE
(
"a(ayay)"
));
builder_initialized
=
TRUE
;
bytes_read
=
llistxattr
(
path
,
NULL
,
0
);
if
(
bytes_read
<
0
)
{
if
(
errno
!=
ENOTSUP
)
{
glnx_set_prefix_error_from_errno
(
error
,
"%s"
,
"llistxattr"
);
goto
out
;
}
}
else
if
(
bytes_read
>
0
)
{
xattr_names
=
g_malloc
(
bytes_read
);
if
(
llistxattr
(
path
,
xattr_names
,
bytes_read
)
<
0
)
{
glnx_set_prefix_error_from_errno
(
error
,
"%s"
,
"llistxattr"
);
goto
out
;
}
xattr_names_canonical
=
canonicalize_xattrs
(
xattr_names
,
bytes_read
);
if
(
!
read_xattr_name_array
(
path
,
-
1
,
xattr_names_canonical
,
bytes_read
,
&
builder
,
error
))
goto
out
;
}
ret_xattrs
=
g_variant_builder_end
(
&
builder
);
builder_initialized
=
FALSE
;
g_variant_ref_sink
(
ret_xattrs
);
ret
=
TRUE
;
if
(
out_xattrs
)
*
out_xattrs
=
g_steal_pointer
(
&
ret_xattrs
);
out:
if
(
!
builder_initialized
)
g_variant_builder_clear
(
&
builder
);
return
ret
;
}
/**
* glnx_fd_get_all_xattrs:
* @fd: a file descriptor
* @out_xattrs: (out): A new #GVariant containing the extended attributes
* @cancellable: Cancellable
* @error: Error
*
* Read all extended attributes from @fd in a canonical sorted order, and
* set @out_xattrs with the result.
*
* If the filesystem does not support extended attributes, @out_xattrs
* will have 0 elements, and this function will return successfully.
*/
gboolean
glnx_fd_get_all_xattrs
(
int
fd
,
GVariant
**
out_xattrs
,
GCancellable
*
cancellable
,
GError
**
error
)
{
gboolean
ret
=
FALSE
;
ssize_t
bytes_read
;
glnx_free
char
*
xattr_names
=
NULL
;
glnx_free
char
*
xattr_names_canonical
=
NULL
;
GVariantBuilder
builder
;
gboolean
builder_initialized
=
FALSE
;
g_autoptr
(
GVariant
)
ret_xattrs
=
NULL
;
g_variant_builder_init
(
&
builder
,
G_VARIANT_TYPE
(
"a(ayay)"
));
builder_initialized
=
TRUE
;
bytes_read
=
flistxattr
(
fd
,
NULL
,
0
);
if
(
bytes_read
<
0
)
{
if
(
errno
!=
ENOTSUP
)
{
glnx_set_prefix_error_from_errno
(
error
,
"%s"
,
"flistxattr"
);
goto
out
;
}
}
else
if
(
bytes_read
>
0
)
{
xattr_names
=
g_malloc
(
bytes_read
);
if
(
flistxattr
(
fd
,
xattr_names
,
bytes_read
)
<
0
)
{
glnx_set_prefix_error_from_errno
(
error
,
"%s"
,
"flistxattr"
);
goto
out
;
}
xattr_names_canonical
=
canonicalize_xattrs
(
xattr_names
,
bytes_read
);
if
(
!
read_xattr_name_array
(
NULL
,
fd
,
xattr_names_canonical
,
bytes_read
,
&
builder
,
error
))
goto
out
;
}
ret_xattrs
=
g_variant_builder_end
(
&
builder
);
builder_initialized
=
FALSE
;
g_variant_ref_sink
(
ret_xattrs
);
ret
=
TRUE
;
if
(
out_xattrs
)
*
out_xattrs
=
g_steal_pointer
(
&
ret_xattrs
);
out:
if
(
!
builder_initialized
)
g_variant_builder_clear
(
&
builder
);
return
ret
;
}
/**
* glnx_dfd_name_get_all_xattrs:
* @dfd: Parent directory file descriptor
* @name: File name
* @out_xattrs: (out): Extended attribute set
* @cancellable: Cancellable
* @error: Error
*
* Load all extended attributes for the file named @name residing in
* directory @dfd.
*/
gboolean
glnx_dfd_name_get_all_xattrs
(
int
dfd
,
const
char
*
name
,
GVariant
**
out_xattrs
,
GCancellable
*
cancellable
,
GError
**
error
)
{
if
(
dfd
==
AT_FDCWD
||
dfd
==
-
1
)
{
return
get_xattrs_impl
(
name
,
out_xattrs
,
cancellable
,
error
);
}
else
{
char
buf
[
PATH_MAX
];
/* A workaround for the lack of lgetxattrat(), thanks to Florian Weimer:
* https://mail.gnome.org/archives/ostree-list/2014-February/msg00017.html
*/
snprintf
(
buf
,
sizeof
(
buf
),
"/proc/self/fd/%d/%s"
,
dfd
,
name
);
return
get_xattrs_impl
(
buf
,
out_xattrs
,
cancellable
,
error
);
}
}
This diff is collapsed.
Click to expand it.
glnx-xattrs.h
0 → 100644
+
45
−
0
View file @
f5399c83
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
*
* Copyright (C) 2014,2015 Colin Walters <walters@verbum.org>.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#pragma once
#include
<glnx-backport-autoptr.h>
#include
<limits.h>
#include
<dirent.h>
#include
<sys/stat.h>
#include
<fcntl.h>
#include
<attr/xattr.h>
G_BEGIN_DECLS
gboolean
glnx_dfd_name_get_all_xattrs
(
int
dfd
,
const
char
*
name
,
GVariant
**
out_xattrs
,
GCancellable
*
cancellable
,
GError
**
error
);
gboolean
glnx_fd_get_all_xattrs
(
int
fd
,
GVariant
**
out_xattrs
,
GCancellable
*
cancellable
,
GError
**
error
);
G_END_DECLS
This diff is collapsed.
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libglnx.h
+
1
−
0
View file @
f5399c83
...
...
@@ -30,5 +30,6 @@ G_BEGIN_DECLS
#include
<glnx-errors.h>
#include
<glnx-dirfd.h>
#include
<glnx-shutil.h>
#include
<glnx-xattrs.h>
G_END_DECLS
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