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annotate toys/pending/mount.c @ 1323:c3061b237c4c draft

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First stab at mount, very incomplete.
author Rob Landley <rob@landley.net>
date Thu, 29 May 2014 06:49:59 -0500
parents
children 9fd2bcedbeb5
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1 /* mount.c - mount filesystems
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2 *
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3 * Copyright 2014 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/mount.html
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6 * Note: -hV is bad spec, haven't implemented -FsLU yet
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7 * no mtab (/proc/mounts does it) so -n is NOP.
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8
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9 USE_MOUNT(NEWTOY(mount, ">2afnrvwt:o*[-rw]", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_STAYROOT))
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10
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11 config MOUNT
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12 bool "mount"
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13 default n
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14 help
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15 usage: mount [-afFrsvw] [-t TYPE] [-o OPTIONS...] [[DEVICE] DIR]
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16
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17 Mount new filesystem(s) on directories. With no arguments, display existing
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18 mounts.
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19
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20 -a mount all entries in /etc/fstab (with -t, only entries of that TYPE)
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21 -f fake it (don't actually mount)
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22 -r read only (same as -o ro)
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23 -w read/write (default, same as -o rw)
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24 -t specify filesystem type
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25 -v verbose
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26
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27 OPTIONS is a comma separated list of options, which can also be supplied
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28 as --longopts.
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29
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30
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31
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32 config MOUNT_AUTODETECT
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33 help
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34 usage: mount
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35
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36 This mount autodetects loopback mounts (a file on a directory) and
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37 bind mounts (file on file, directory on directory), so you don't need
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38 to say --bind or --loop.
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39 */
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40
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41 #define FOR_mount
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42 #include "toys.h"
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43
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44 GLOBALS(
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45 struct arg_list *optlist;
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46 char *type;
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47
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48 unsigned long flags;
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49 char *opts;
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50 )
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51
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52 static void do_mount(char *dev, char *dir, char *type, unsigned long flags, char *opts)
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53 {
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54 FILE *fp = 0;
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55 int rc = EINVAL;
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56
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57 if (toys.optflags & FLAG_f) return;
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58
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59 if (!TT.type) fp = xfopen("/proc/filesystems", "r");
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60
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61 for (;;) {
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62 char *buf = 0;
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63
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64 // If type wasn't specified, try all of them in order.
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65 if (fp) {
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66 size_t i;
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67
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68 if (getline(&buf, &i, fp)<0) break;
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69 type = buf;
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70 // skip nodev devices
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71 if (!isspace(*type)) {
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72 free(buf);
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73 continue;
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74 }
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75 // trim whitespace
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76 while (isspace(*type)) type++;
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77 i = strlen(type);
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78 if (i) type[i-1] = 0;
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79 }
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80 rc = mount(dev, dir, type, flags, opts);
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81 if (!fp || (rc && errno != EINVAL)) break;
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82 free(buf);
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83 }
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84 if (fp) fclose(fp);
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85
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86 if (rc) perror_msg("'%s' on '%s'", dev, dir);
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87 }
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88
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89 void mount_main(void)
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90 {
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91 if (toys.optflags & FLAG_a) {
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92 fprintf(stderr, "not yet\n");
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93 return;
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94 }
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95
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96 // show mounts
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97 if (!toys.optc) {
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98 struct mtab_list *mtl = xgetmountlist(0), *m;
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99
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100 for (mtl = xgetmountlist(0); mtl && (m = dlist_pop(&mtl)); free(m)) {
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101 char *s = 0;
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102
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103 if (TT.type && strcmp(TT.type, m->type)) continue;
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104 if (*m->device == '/') s = xabspath(m->device, 0);
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105 xprintf("%s on %s type %s (%s)\n",
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106 s ? s : m->device, m->dir, m->type, m->opts);
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107 free(s);
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108 }
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109
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110 // one argument: from fstab, remount, subtree
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111 } else if (toys.optc == 1) {
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112 fprintf(stderr, "not yet\n");
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113 return;
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114 // two arguments
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115 } else do_mount(toys.optargs[0], toys.optargs[1], TT.type, 0, "");
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116 }