annotate toys/other/blkid.c @ 1736:5892daac85ab draft

Switch nsenter to default y.
author Rob Landley <rob@landley.net>
date Thu, 12 Mar 2015 15:34:03 -0500
parents 21867cda5e41
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1086
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1 /* blkid.c - Prints type, label and UUID of filesystem(s).
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2 *
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3 * Copyright 2013 Brad Conroy <bconroy@uis.edu>
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4 *
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5 * See ftp://ftp.kernel.org/pub/linux/utils/util-linux/v2.24/libblkid-docs/api-index-full.html
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6
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7 USE_BLKID(NEWTOY(blkid, "<1", TOYFLAG_BIN))
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8 USE_FSTYPE(NEWTOY(fstype, "<1", TOYFLAG_BIN))
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9
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10 config BLKID
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11 bool "blkid"
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12 default y
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13 help
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14 usage: blkid DEV...
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15
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16 Prints type, label and UUID of filesystem on a block device or image.
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fc1bb49e58a9 Help text should have a blank line after usage: lines, and a couple other whitespace tweaks.
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17
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18 config FSTYPE
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19 bool "fstype"
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20 default y
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21 help
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22 usage: fstype DEV...
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23
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24 Prints type of filesystem on a block device or image.
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25 */
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26
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27 #define FOR_blkid
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28 #include "toys.h"
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29
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30 struct fstype {
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31 char *name;
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32 uint64_t magic;
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33 int magic_len, magic_offset, uuid_off, label_len, label_off;
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34 };
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35
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36 static const struct fstype fstypes[] = {
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37 {"ext2", 0xEF53, 2, 1080, 1128, 16, 1144}, // keep this first for ext3/4 check
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38 // NTFS label actually 8/16 0x4d80 but horrible: 16 bit wide characters via
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39 // codepage, something called a uuid that's only 8 bytes long...
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40 {"ntfs", 0x5346544e, 4, 3, 0x48+(8<<24), 0, 0},
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41
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42 {"adfs", 0xadf5, 2, 0xc00, 0,0,0},
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43 {"bfs", 0x1badface, 4, 0, 0,0,0},
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44 {"btrfs", 0x4D5F53665248425FULL, 8, 65600, 65803, 256, 65819},
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45 {"cramfs", 0x28cd3d45, 4, 0, 0, 16, 48},
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46 {"f2fs", 0xF2F52010, 4, 1024, 1132, 16, 1110},
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47 {"jfs", 0x3153464a, 4, 32768, 32920, 16, 32904},
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48 {"nilfs", 0x3434, 2, 1030, 1176, 80, 1192},
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49 {"reiserfs", 0x724573496552ULL, 6, 8244, 8276, 16, 8292},
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50 {"reiserfs", 0x724573496552ULL, 6, 65588, 65620, 16, 65536},
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51 {"romfs", 0x2d6d6f72, 4, 0, 0,0,0},
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52 {"squashfs", 0x73717368, 4, 0, 0,0,0},
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53 {"xiafs", 0x012fd16d, 4, 572, 0,0,0},
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54 {"xfs", 0x42534658, 4, 0, 32, 12, 108},
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55 {"vfat", 0x3233544146ULL, 5, 82, 67+(4<<24), 11, 71}, // fat32
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56 {"vfat", 0x31544146, 4, 54, 39+(4<<24), 11, 43} // fat1
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57 };
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58
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59 /* TODO if no args use proc/partitions */
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60 void do_blkid(int fd, char *name)
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61 {
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62 int off, i, j;
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63 char *type;
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64
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65 off = i = 0;
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66
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67 for (;;) {
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68 int pass = 0, len;
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69
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70 // Read next block of data
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71 len = readall(fd, toybuf, sizeof(toybuf));
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72 if (len != sizeof(toybuf)) return;
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73
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74 // Iterate through types in range
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75 for (i=0; i < sizeof(fstypes)/sizeof(struct fstype); i++) {
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76 uint64_t test;
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77
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78 // Skip tests not in this 4k block
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79 if (fstypes[i].magic_offset > off+sizeof(toybuf)) {
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80 pass++;
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81 continue;
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82 }
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83 if (fstypes[i].magic_offset < off) continue;
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84
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85 // Populate 64 bit little endian magic value
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86 test = 0;
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87 for (j = 0; j < fstypes[i].magic_len; j++)
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88 test += ((uint64_t)toybuf[j+fstypes[i].magic_offset-off])<<(8*j);
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89 if (test == fstypes[i].magic) break;
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90 }
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91
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92 if (i == sizeof(fstypes)/sizeof(struct fstype)) {
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93 off += len;
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94 if (pass) continue;
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95 return;
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96 }
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97 break;
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98 }
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99
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100 // distinguish ext2/3/4
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101 type = fstypes[i].name;
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102 if (!i) {
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103 if (toybuf[1116]&4) type = "ext3";
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104 if (toybuf[1120]&64) type = "ext4";
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105 }
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106
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107 // Could special case NTFS here...
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108
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109 // Output for fstype
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110 if (*toys.which->name == 'f') {
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111 puts(type);
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112 return;
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113 }
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114
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115 // output for blkid
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116 printf("%s:",name);
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117
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118 if (fstypes[i].label_len)
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119 printf(" LABEL=\"%.*s\"", fstypes[i].label_len,
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120 toybuf+fstypes[i].label_off-off);
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121
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122 if (fstypes[i].uuid_off) {
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123 int bits = 0x550, size = fstypes[i].uuid_off >> 24,
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124 uoff = (fstypes[i].uuid_off & ((1<<24)-1))-off;
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125
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126 if (size) bits = 4*(size == 4);
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127 else size = 16;
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128
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129 printf(" UUID=\"");
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130 for (j = 0; j < size; j++) printf("-%02x"+!(bits & (1<<j)), toybuf[uoff+j]);
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131 printf("\"");
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132 }
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133
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134 printf(" TYPE=\"%s\"\n", type);
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135 }
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136
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137 void blkid_main(void)
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138 {
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139 loopfiles(toys.optargs, do_blkid);
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140 }
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141
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142 void fstype_main(void)
21867cda5e41 Give fstype its own config symbol (separate from blkid), and fix blkid not using more accurate ext3/ext4 filesystem sub-type.
Rob Landley <rob@landley.net>
parents: 1333
diff changeset
143 {
21867cda5e41 Give fstype its own config symbol (separate from blkid), and fix blkid not using more accurate ext3/ext4 filesystem sub-type.
Rob Landley <rob@landley.net>
parents: 1333
diff changeset
144 blkid_main();
21867cda5e41 Give fstype its own config symbol (separate from blkid), and fix blkid not using more accurate ext3/ext4 filesystem sub-type.
Rob Landley <rob@landley.net>
parents: 1333
diff changeset
145 }