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annotate toys/lsb/umount.c @ 1183:0752b2d58909 draft

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Rename xmsprintf() to just xmprintf(). Partly because there's no supplied target string ala sprintf, and partly because I can never remember what order the m and s go in.
author Rob Landley <rob@landley.net>
date Thu, 16 Jan 2014 09:26:50 -0600
parents ac4a0cde89c2
children 4d898affda0c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1044
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1 /* umount.c - Unmount a mount point.
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2 *
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3 * Copyright 2012 Rob Landley <rob@landley.net>
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4 *
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5 * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/umount.html
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6 *
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7 * Note: -n (/etc/mtab) is obsolete, /proc/mounts replaced it. Neither chroot
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8 * nor per-process mount namespaces can work sanely with mtab. The kernel
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9 * tracks mount points now, a userspace application can't do so anymore.
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10
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11 USE_UMOUNT(NEWTOY(umount, "ndDflrat*v", TOYFLAG_BIN|TOYFLAG_STAYROOT))
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12
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13 config UMOUNT
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14 bool "umount"
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15 default y
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16 help
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17 usage: umount [-a [-t TYPE[,TYPE...]]] [-vrfD] [DIR...]
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18
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19 Unmount the listed filesystems.
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20
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21 -a Unmount all mounts in /proc/mounts instead of command line list
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22 -t Restrict "all" to mounts of TYPE (or use "noTYPE" to skip)
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23 -D Don't free loopback device(s).
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24 -f Force unmount.
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25 -l Lazy unmount (detach from filesystem now, close when last user does).
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26 -r Remount read only if unmounting fails.
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27 -v Verbose
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28 */
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29
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30 #define FOR_umount
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31 #include "toys.h"
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32
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33 GLOBALS(
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34 struct arg_list *t;
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35
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36 char *types;
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37 )
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38
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39 // todo
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40 // borrow df code to identify filesystem?
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41 // umount -a from fstab
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42 // umount when getpid() not 0, according to fstab
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43 // lookup mount: losetup -d, bind, file, block
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44
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45 // TODO
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46 // loopback delete
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47 // fstab -o user
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48
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49 // Realloc *old with oldstring,newstring
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50
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51 void comma_collate(char **old, char *new)
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52 {
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53 char *temp, *atold = *old;
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54
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55 // Only add a comma if old string didn't end with one
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56 if (atold && *atold) {
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57 char *comma = ",";
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58
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59 if (atold[strlen(atold)-1] == ',') comma = "";
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60 temp = xmprintf("%s%s%s", atold, comma, new);
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61 } else temp = xstrdup(new);
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62 free (atold);
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63 *old = temp;
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64 }
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65
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66 void arg_comma_collate(char **old, struct arg_list *arg)
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67 {
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68 while (arg) {
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69 comma_collate(old, arg->arg);
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70 arg = arg->next;
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71 }
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72 }
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73
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74 char *comma_iterate(char **list, int *len)
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75 {
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76 char *start = *list, *end;
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77
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78 if (!*list) return 0;
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79 if (!(end = strchr(*list, ','))) {
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80 *len = strlen(*list);
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81 *list = 0;
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82 } else *list += (*len = end-start)+1;
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83
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84 return start;
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85 }
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86
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87 static void do_umount(char *dir, int flags)
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88 {
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89 if (!umount2(dir, flags)) {
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90 if (toys.optflags & FLAG_v) printf("%s unmounted", dir);
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91 return;
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92 }
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93 if (toys.optflags & FLAG_r) {
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94 if (!mount("", dir, "", MS_REMOUNT|MS_RDONLY, "")) {
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95 if (toys.optflags & FLAG_v) printf("%s remounted ro", dir);
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96 return;
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97 }
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98 }
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99 perror_msg("%s", dir);
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100 }
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101
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102 void umount_main(void)
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103 {
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104 int flags=0;
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105 char **optargs;
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106
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107 if (!toys.optc && !(toys.optflags & FLAG_a))
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108 error_exit("Need 1 arg or -a");
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109
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110 if (toys.optflags & FLAG_f) flags |= MNT_FORCE;
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111 if (toys.optflags & FLAG_l) flags |= MNT_DETACH;
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112
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113 for (optargs = toys.optargs; *optargs; optargs++) do_umount(*optargs, flags);
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114
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115 if (toys.optflags & FLAG_a) {
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116 struct mtab_list *mlsave, *ml;
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117 char *typestr = 0;
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118
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119 if (TT.t) arg_comma_collate(&typestr, TT.t);
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120
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121 // Loop through mounted filesystems
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122 for (mlsave = ml = xgetmountlist(0); ml; ml = ml->next) {
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123 if (TT.t) {
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124 char *type, *types = typestr;
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125 int len, skip = strncmp(types, "no", 2);
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126
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127 // Loop through -t filters
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128 for (;;) {
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129 if (!(type = comma_iterate(&types, &len))) break;
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130 if (!skip) {
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131 if (strncmp(type, "no", 2)) error_exit("bad -t");
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132 if (!strncmp(type+2, ml->type, len-2)) {
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133 skip = 1;
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134 break;
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135 }
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136 } else if (!strncmp(type, ml->type, len) && !ml->type[len]) {
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137 skip = 0;
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138 break;
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139 }
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140 }
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141 if (skip) continue;
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142 }
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143 do_umount(ml->dir, flags);
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144 }
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145 if (CFG_TOYBOX_FREE) {
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146 free(typestr);
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147 llist_traverse(mlsave, free);
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148 }
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149
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150 return;
e62df9eb3661 First pass at umount, not quite done yet.
Rob Landley <rob@landley.net>
parents:
diff changeset
151 }
e62df9eb3661 First pass at umount, not quite done yet.
Rob Landley <rob@landley.net>
parents:
diff changeset
152 }