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annotate toys/other/makedevs.c @ 1776:7bf68329eb3b draft default tip

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Repository switched to git at https://github.com/landley/toybox
author Rob Landley <rob@landley.net>
date Thu, 09 Apr 2015 02:28:32 -0500
parents 9adb0ccb617e
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* makedevs.c - Make ranges of device files.
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2 *
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3 * Copyright 2014 Bilal Qureshi <bilal.jmi@gmail.com>
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4 * Copyright 2014 Kyungwan Han <asura321@gmail.com>
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5 *
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6 * No Standard
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7
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8 USE_MAKEDEVS(NEWTOY(makedevs, "<1>1d:", TOYFLAG_USR|TOYFLAG_BIN))
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9
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10 config MAKEDEVS
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11 bool "makedevs"
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12 default y
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13 help
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14 usage: makedevs [-d device_table] rootdir
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15
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16 Create a range of special files as specified in a device table.
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17
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18 -d file containing device table (default reads from stdin)
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19
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20 Each line of of the device table has the fields:
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21 <name> <type> <mode> <uid> <gid> <major> <minor> <start> <increment> <count>
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22 Where name is the file name, and type is one of the following:
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23
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24 b Block device
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25 c Character device
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26 d Directory
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27 f Regular file
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28 p Named pipe (fifo)
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29
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30 Other fields specify permissions, user and group id owning the file,
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31 and additional fields for device special files. Use '-' for blank entries,
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32 unspecified fields are treated as '-'.
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33 */
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34
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35 #define FOR_makedevs
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36 #include "toys.h"
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37
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38 GLOBALS(
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39 char *fname;
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40 )
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41
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42 void makedevs_main()
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43 {
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44 int fd = 0, line_no, i;
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45 char *line = NULL;
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46
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47 // Open file and chdir, verbosely
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48 xprintf("rootdir = %s\n", *toys.optargs);
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49 if (toys.optflags & FLAG_d && strcmp(TT.fname, "-")) {
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50 fd = xopen(TT.fname, O_RDONLY);
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51 xprintf("table = %s\n", TT.fname);
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52 } else xprintf("table = <stdin>\n");
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53 xchdir(*toys.optargs);
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54
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55 for (line_no = 0; (line = get_line(fd)); free(line)) {
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56 char type=0, user[64], group[64], *node, *ptr = line;
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57 unsigned int mode = 0755, major = 0, minor = 0, cnt = 0, incr = 0,
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58 st_val = 0;
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59 uid_t uid;
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60 gid_t gid;
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61 struct stat st;
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62
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63 line_no++;
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64 while (isspace(*ptr)) ptr++;
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65 if (!*ptr || *ptr == '#') continue;
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66 node = ptr;
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67
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68 while (*ptr && !isspace(*ptr)) ptr++;
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69 if (*ptr) *(ptr++) = 0;
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70 *user = *group = 0;
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71 sscanf(ptr, "%c %o %63s %63s %u %u %u %u %u", &type, &mode,
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72 user, group, &major, &minor, &st_val, &incr, &cnt);
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73
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74 // type order here needs to line up with actions[] order.
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75 i = stridx("pcbdf", type);
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76 if (i == -1) {
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77 error_msg("line %d: bad type %c", line_no, type);
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78 continue;
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79 } else mode |= (mode_t[]){S_IFIFO, S_IFCHR, S_IFBLK, 0, 0}[i];
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80
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81 uid = *user ? xgetpwnamid(user)->pw_uid : getuid();
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82 gid = *group ? xgetgrnamid(group)->gr_gid : getgid();
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83
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84 while (*node == '/') node++; // using relative path
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85
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86 for (i = 0; (!cnt && !i) || i < cnt; i++) {
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87 if (cnt) {
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88 snprintf(toybuf, sizeof(toybuf), "%s%u", node, st_val + i);
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89 ptr = toybuf;
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90 } else ptr = node;
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91
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92 if (type == 'd') {
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93 if (mkpathat(AT_FDCWD, ptr, mode, 3)) {
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94 perror_msg("can't create directory '%s'", ptr);
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95 continue;
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96 }
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97 } else if (type == 'f') {
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98 if (stat(ptr, &st) || !S_ISREG(st.st_mode)) {
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99 perror_msg("line %d: file '%s' does not exist", line_no, ptr);
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100 continue;
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101 }
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102 } else if (mknod(ptr, mode, makedev(major, minor + i*incr))) {
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103 perror_msg("line %d: can't create node '%s'", line_no, ptr);
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104 continue;
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105 }
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106
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107 if (chown(ptr, uid, gid) || chmod(ptr, mode))
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108 perror_msg("line %d: can't chown/chmod '%s'", line_no, ptr);
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109 }
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110 }
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111 xclose(fd);
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112 }