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annotate toys/pending/makedevs.c @ 1372:d46baa9adb5f draft

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Bugfixes for cleaned up makedevs. Newline after table = <stdin>, move start/increment/count loop around entire device creation if/else staircase including chmod/chown code and use ptr to record node vs toybuf.
author Rob Landley <rob@landley.net>
date Mon, 30 Jun 2014 04:58:37 -0500
parents b9605ebd3af4
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 n
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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 value, 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 if (*user) {
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82 struct passwd *usr;
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83
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84 if (!(usr = getpwnam(user)) && isdigit(*user)) {
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85 sscanf(user, "%u", &value);
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86 usr = xgetpwuid(value);
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87 }
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88 if (!usr) error_exit("bad user '%s'", user);
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89 uid = usr->pw_uid;
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90 } else uid = getuid();
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91
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92 if (*group) {
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93 struct group *grp;
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94
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95 if (!(grp = getgrnam(group)) && isdigit(*group)) {
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96 sscanf (group, "%u", &value);
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97 grp = getgrgid(value);
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98 }
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99 if (!grp) error_exit("bad group '%s'", group);
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100 gid = grp->gr_gid;
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101 } else gid = getgid();
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102
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103 while (*node == '/') node++; // using relative path
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104
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105 for (i = 0; (!cnt && !i) || i < cnt; i++) {
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106 if (cnt) {
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107 snprintf(toybuf, sizeof(toybuf), "%s%u", node, st_val + i);
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108 ptr = toybuf;
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109 } else ptr = node;
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110
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111 if (type == 'd') {
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112 if (mkpathat(AT_FDCWD, ptr, mode, 3)) {
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113 perror_msg("can't create directory '%s'", ptr);
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114 continue;
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115 }
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116 } else if (type == 'f') {
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117 if (stat(ptr, &st) || !S_ISREG(st.st_mode)) {
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118 perror_msg("line %d: file '%s' does not exist", line_no, ptr);
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119 continue;
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Rob Landley <rob@landley.net>
parents: 1362
diff changeset
120 }
d46baa9adb5f Bugfixes for cleaned up makedevs.
Rob Landley <rob@landley.net>
parents: 1362
diff changeset
121 } else if (mknod(ptr, mode, makedev(major, minor + i*incr))) {
d46baa9adb5f Bugfixes for cleaned up makedevs.
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parents: 1362
diff changeset
122 perror_msg("line %d: can't create node '%s'", line_no, ptr);
1362
b9605ebd3af4 Cleanup pass on makedevs. Need to test it before promoting.
Rob Landley <rob@landley.net>
parents: 1325
diff changeset
123 continue;
b9605ebd3af4 Cleanup pass on makedevs. Need to test it before promoting.
Rob Landley <rob@landley.net>
parents: 1325
diff changeset
124 }
1372
d46baa9adb5f Bugfixes for cleaned up makedevs.
Rob Landley <rob@landley.net>
parents: 1362
diff changeset
125
d46baa9adb5f Bugfixes for cleaned up makedevs.
Rob Landley <rob@landley.net>
parents: 1362
diff changeset
126 if (chown(ptr, uid, gid) || chmod(ptr, mode))
d46baa9adb5f Bugfixes for cleaned up makedevs.
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parents: 1362
diff changeset
127 perror_msg("line %d: can't chown/chmod '%s'", line_no, ptr);
1325
41fc44c76ade makedevs - making devices/nodes in a range. Supports reading the tabled entry from file.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
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128 }
41fc44c76ade makedevs - making devices/nodes in a range. Supports reading the tabled entry from file.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
129 }
41fc44c76ade makedevs - making devices/nodes in a range. Supports reading the tabled entry from file.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
130 xclose(fd);
41fc44c76ade makedevs - making devices/nodes in a range. Supports reading the tabled entry from file.
Ashwini Sharma <ak.ashwini1981@gmail.com>
parents:
diff changeset
131 }