author | Mikael Berthe <mikael@lilotux.net> |
Thu, 22 Sep 2022 16:33:34 +0200 | |
changeset 262 | 8d3354485fc3 |
parent 256 | 6d9efbef00a9 |
permissions | -rw-r--r-- |
242
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1 |
// Copyright 2018 The Go Authors. All rights reserved. |
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2 |
// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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4 |
|
256 | 5 |
//go:build freebsd || netbsd |
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6 |
// +build freebsd netbsd |
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7 |
|
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8 |
package unix |
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9 |
|
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10 |
import ( |
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11 |
"strings" |
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12 |
"unsafe" |
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13 |
) |
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14 |
|
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15 |
// Derive extattr namespace and attribute name |
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16 |
|
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17 |
func xattrnamespace(fullattr string) (ns int, attr string, err error) { |
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s := strings.IndexByte(fullattr, '.') |
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if s == -1 { |
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return -1, "", ENOATTR |
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21 |
} |
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22 |
|
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23 |
namespace := fullattr[0:s] |
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attr = fullattr[s+1:] |
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25 |
|
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26 |
switch namespace { |
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27 |
case "user": |
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28 |
return EXTATTR_NAMESPACE_USER, attr, nil |
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29 |
case "system": |
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return EXTATTR_NAMESPACE_SYSTEM, attr, nil |
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31 |
default: |
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return -1, "", ENOATTR |
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33 |
} |
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34 |
} |
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35 |
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36 |
func initxattrdest(dest []byte, idx int) (d unsafe.Pointer) { |
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if len(dest) > idx { |
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return unsafe.Pointer(&dest[idx]) |
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39 |
} else { |
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return unsafe.Pointer(_zero) |
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41 |
} |
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42 |
} |
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43 |
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44 |
// FreeBSD and NetBSD implement their own syscalls to handle extended attributes |
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45 |
|
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46 |
func Getxattr(file string, attr string, dest []byte) (sz int, err error) { |
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d := initxattrdest(dest, 0) |
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48 |
destsize := len(dest) |
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49 |
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50 |
nsid, a, err := xattrnamespace(attr) |
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51 |
if err != nil { |
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return -1, err |
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53 |
} |
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54 |
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55 |
return ExtattrGetFile(file, nsid, a, uintptr(d), destsize) |
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56 |
} |
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57 |
|
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58 |
func Fgetxattr(fd int, attr string, dest []byte) (sz int, err error) { |
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d := initxattrdest(dest, 0) |
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60 |
destsize := len(dest) |
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61 |
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62 |
nsid, a, err := xattrnamespace(attr) |
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63 |
if err != nil { |
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64 |
return -1, err |
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65 |
} |
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66 |
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67 |
return ExtattrGetFd(fd, nsid, a, uintptr(d), destsize) |
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68 |
} |
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69 |
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70 |
func Lgetxattr(link string, attr string, dest []byte) (sz int, err error) { |
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d := initxattrdest(dest, 0) |
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72 |
destsize := len(dest) |
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73 |
|
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74 |
nsid, a, err := xattrnamespace(attr) |
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75 |
if err != nil { |
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76 |
return -1, err |
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77 |
} |
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78 |
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79 |
return ExtattrGetLink(link, nsid, a, uintptr(d), destsize) |
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80 |
} |
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81 |
|
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82 |
// flags are unused on FreeBSD |
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83 |
|
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84 |
func Fsetxattr(fd int, attr string, data []byte, flags int) (err error) { |
251 | 85 |
var d unsafe.Pointer |
86 |
if len(data) > 0 { |
|
87 |
d = unsafe.Pointer(&data[0]) |
|
88 |
} |
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242
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89 |
datasiz := len(data) |
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90 |
|
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91 |
nsid, a, err := xattrnamespace(attr) |
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92 |
if err != nil { |
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93 |
return |
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94 |
} |
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95 |
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96 |
_, err = ExtattrSetFd(fd, nsid, a, uintptr(d), datasiz) |
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97 |
return |
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98 |
} |
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99 |
|
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100 |
func Setxattr(file string, attr string, data []byte, flags int) (err error) { |
251 | 101 |
var d unsafe.Pointer |
102 |
if len(data) > 0 { |
|
103 |
d = unsafe.Pointer(&data[0]) |
|
104 |
} |
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105 |
datasiz := len(data) |
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106 |
|
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107 |
nsid, a, err := xattrnamespace(attr) |
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108 |
if err != nil { |
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109 |
return |
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110 |
} |
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111 |
|
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112 |
_, err = ExtattrSetFile(file, nsid, a, uintptr(d), datasiz) |
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113 |
return |
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114 |
} |
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115 |
|
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116 |
func Lsetxattr(link string, attr string, data []byte, flags int) (err error) { |
251 | 117 |
var d unsafe.Pointer |
118 |
if len(data) > 0 { |
|
119 |
d = unsafe.Pointer(&data[0]) |
|
120 |
} |
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242
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121 |
datasiz := len(data) |
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122 |
|
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123 |
nsid, a, err := xattrnamespace(attr) |
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124 |
if err != nil { |
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125 |
return |
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126 |
} |
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127 |
|
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128 |
_, err = ExtattrSetLink(link, nsid, a, uintptr(d), datasiz) |
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129 |
return |
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130 |
} |
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131 |
|
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132 |
func Removexattr(file string, attr string) (err error) { |
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133 |
nsid, a, err := xattrnamespace(attr) |
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134 |
if err != nil { |
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135 |
return |
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|
136 |
} |
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|
137 |
|
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|
138 |
err = ExtattrDeleteFile(file, nsid, a) |
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|
139 |
return |
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|
140 |
} |
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|
141 |
|
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|
142 |
func Fremovexattr(fd int, attr string) (err error) { |
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parents:
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|
143 |
nsid, a, err := xattrnamespace(attr) |
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parents:
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|
144 |
if err != nil { |
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parents:
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changeset
|
145 |
return |
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|
146 |
} |
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changeset
|
147 |
|
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|
148 |
err = ExtattrDeleteFd(fd, nsid, a) |
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|
149 |
return |
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|
150 |
} |
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changeset
|
151 |
|
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|
152 |
func Lremovexattr(link string, attr string) (err error) { |
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parents:
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|
153 |
nsid, a, err := xattrnamespace(attr) |
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|
154 |
if err != nil { |
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|
155 |
return |
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changeset
|
156 |
} |
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changeset
|
157 |
|
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parents:
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|
158 |
err = ExtattrDeleteLink(link, nsid, a) |
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|
159 |
return |
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|
160 |
} |
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changeset
|
161 |
|
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changeset
|
162 |
func Listxattr(file string, dest []byte) (sz int, err error) { |
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|
163 |
destsiz := len(dest) |
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|
164 |
|
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parents:
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|
165 |
// FreeBSD won't allow you to list xattrs from multiple namespaces |
262 | 166 |
s, pos := 0, 0 |
242
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|
167 |
for _, nsid := range [...]int{EXTATTR_NAMESPACE_USER, EXTATTR_NAMESPACE_SYSTEM} { |
262 | 168 |
stmp, e := ListxattrNS(file, nsid, dest[pos:]) |
242
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|
169 |
|
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|
170 |
/* Errors accessing system attrs are ignored so that |
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parents:
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changeset
|
171 |
* we can implement the Linux-like behavior of omitting errors that |
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parents:
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changeset
|
172 |
* we don't have read permissions on |
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|
173 |
* |
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parents:
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changeset
|
174 |
* Linux will still error if we ask for user attributes on a file that |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
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changeset
|
175 |
* we don't have read permissions on, so don't ignore those errors |
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parents:
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changeset
|
176 |
*/ |
262 | 177 |
if e != nil { |
178 |
if e == EPERM && nsid != EXTATTR_NAMESPACE_USER { |
|
179 |
continue |
|
180 |
} |
|
242
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|
181 |
return s, e |
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changeset
|
182 |
} |
2a9ec03fe5a1
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parents:
diff
changeset
|
183 |
|
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parents:
diff
changeset
|
184 |
s += stmp |
262 | 185 |
pos = s |
186 |
if pos > destsiz { |
|
187 |
pos = destsiz |
|
242
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parents:
diff
changeset
|
188 |
} |
262 | 189 |
} |
190 |
||
191 |
return s, nil |
|
192 |
} |
|
193 |
||
194 |
func ListxattrNS(file string, nsid int, dest []byte) (sz int, err error) { |
|
195 |
d := initxattrdest(dest, 0) |
|
196 |
destsiz := len(dest) |
|
197 |
||
198 |
s, e := ExtattrListFile(file, nsid, uintptr(d), destsiz) |
|
199 |
if e != nil { |
|
200 |
return 0, err |
|
242
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parents:
diff
changeset
|
201 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
202 |
|
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
203 |
return s, nil |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
204 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
205 |
|
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
206 |
func Flistxattr(fd int, dest []byte) (sz int, err error) { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
207 |
destsiz := len(dest) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
208 |
|
262 | 209 |
s, pos := 0, 0 |
242
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
210 |
for _, nsid := range [...]int{EXTATTR_NAMESPACE_USER, EXTATTR_NAMESPACE_SYSTEM} { |
262 | 211 |
stmp, e := FlistxattrNS(fd, nsid, dest[pos:]) |
212 |
||
213 |
if e != nil { |
|
214 |
if e == EPERM && nsid != EXTATTR_NAMESPACE_USER { |
|
215 |
continue |
|
216 |
} |
|
242
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
217 |
return s, e |
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Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
218 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
219 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
220 |
s += stmp |
262 | 221 |
pos = s |
222 |
if pos > destsiz { |
|
223 |
pos = destsiz |
|
242
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
224 |
} |
262 | 225 |
} |
226 |
||
227 |
return s, nil |
|
228 |
} |
|
229 |
||
230 |
func FlistxattrNS(fd int, nsid int, dest []byte) (sz int, err error) { |
|
231 |
d := initxattrdest(dest, 0) |
|
232 |
destsiz := len(dest) |
|
233 |
||
234 |
s, e := ExtattrListFd(fd, nsid, uintptr(d), destsiz) |
|
235 |
if e != nil { |
|
236 |
return 0, err |
|
242
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
237 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
238 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
239 |
return s, nil |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
240 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
241 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
242 |
func Llistxattr(link string, dest []byte) (sz int, err error) { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
243 |
destsiz := len(dest) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
244 |
|
262 | 245 |
s, pos := 0, 0 |
242
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
246 |
for _, nsid := range [...]int{EXTATTR_NAMESPACE_USER, EXTATTR_NAMESPACE_SYSTEM} { |
262 | 247 |
stmp, e := LlistxattrNS(link, nsid, dest[pos:]) |
248 |
||
249 |
if e != nil { |
|
250 |
if e == EPERM && nsid != EXTATTR_NAMESPACE_USER { |
|
251 |
continue |
|
252 |
} |
|
242
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
253 |
return s, e |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
254 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
255 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
256 |
s += stmp |
262 | 257 |
pos = s |
258 |
if pos > destsiz { |
|
259 |
pos = destsiz |
|
242
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
260 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
261 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
262 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
263 |
return s, nil |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
264 |
} |
262 | 265 |
|
266 |
func LlistxattrNS(link string, nsid int, dest []byte) (sz int, err error) { |
|
267 |
d := initxattrdest(dest, 0) |
|
268 |
destsiz := len(dest) |
|
269 |
||
270 |
s, e := ExtattrListLink(link, nsid, uintptr(d), destsiz) |
|
271 |
if e != nil { |
|
272 |
return 0, err |
|
273 |
} |
|
274 |
||
275 |
return s, nil |
|
276 |
} |