xref: /third_party/toybox/toys/other/makedevs.c (revision 0f66f451) 
1/* makedevs.c - Make ranges of device files.
2 *
3 * Copyright 2014 Bilal Qureshi <bilal.jmi@gmail.com>
4 * Copyright 2014 Kyungwan Han <asura321@gmail.com>
5 *
6 * No Standard
7
8USE_MAKEDEVS(NEWTOY(makedevs, "<1>1d:", TOYFLAG_USR|TOYFLAG_BIN))
9
10config MAKEDEVS
11  bool "makedevs"
12  default y
13  help
14    usage: makedevs [-d device_table] rootdir
15
16    Create a range of special files as specified in a device table.
17
18    -d	File containing device table (default reads from stdin)
19
20    Each line of the device table has the fields:
21    <name> <type> <mode> <uid> <gid> <major> <minor> <start> <increment> <count>
22    Where name is the file name, and type is one of the following:
23
24    b	Block device
25    c	Character device
26    d	Directory
27    f	Regular file
28    p	Named pipe (fifo)
29
30    Other fields specify permissions, user and group id owning the file,
31    and additional fields for device special files. Use '-' for blank entries,
32    unspecified fields are treated as '-'.
33*/
34
35#define FOR_makedevs
36#include "toys.h"
37
38GLOBALS(
39  char *d;
40)
41
42void makedevs_main(void)
43{
44  FILE *fp = stdin;
45  char *line = NULL;
46  size_t allocated_length = 0;
47  int line_no = 0, i;
48
49  // Open file and chdir, verbosely
50  xprintf("rootdir = %s\n", *toys.optargs);
51  if (FLAG(d) && strcmp(TT.d, "-")) {
52    fp = xfopen(TT.d, "r");
53    xprintf("table = %s\n", TT.d);
54  } else xprintf("table = <stdin>\n");
55  xchdir(*toys.optargs);
56
57  while (getline(&line, &allocated_length, fp) > 0) {
58    char type=0, user[64], group[64], *node, *ptr = line;
59    unsigned int mode = 0755, major = 0, minor = 0, cnt = 0, incr = 0,
60                 st_val = 0;
61    uid_t uid;
62    gid_t gid;
63    struct stat st;
64
65    line_no++;
66    while (isspace(*ptr)) ptr++;
67    if (!*ptr || *ptr == '#') continue;
68    node = ptr;
69
70    while (*ptr && !isspace(*ptr)) ptr++;
71    if (*ptr) *(ptr++) = 0;
72    *user = *group = 0;
73    sscanf(ptr, "%c %o %63s %63s %u %u %u %u %u", &type, &mode,
74           user, group, &major, &minor, &st_val, &incr, &cnt);
75
76    // type order here needs to line up with actions[] order.
77    i = stridx("pcbdf", type);
78    if (i == -1) {
79      error_msg("line %d: bad type %c", line_no, type);
80      continue;
81    } else mode |= (mode_t[]){S_IFIFO, S_IFCHR, S_IFBLK, 0, 0}[i];
82
83    uid = *user ? xgetuid(user) : getuid();
84    gid = *group ? xgetgid(group) : getgid();
85
86    while (*node == '/') node++; // using relative path
87
88    for (i = 0; (!cnt && !i) || i < cnt; i++) {
89      if (cnt>1) {
90        snprintf(toybuf, sizeof(toybuf), "%.999s%u", node, st_val + i);
91        ptr = toybuf;
92      } else ptr = node;
93
94      if (type == 'd') {
95        if (mkpathat(AT_FDCWD, ptr, mode, MKPATHAT_MKLAST | MKPATHAT_MAKE))  {
96          perror_msg("can't create directory '%s'", ptr);
97          continue;
98        }
99      } else if (type == 'f') {
100        if (stat(ptr, &st) || !S_ISREG(st.st_mode)) {
101          perror_msg("line %d: file '%s' does not exist", line_no, ptr);
102          continue;
103        }
104      } else if (mknod(ptr, mode, dev_makedev(major, minor + i*incr))) {
105        perror_msg("line %d: can't create node '%s'", line_no, ptr);
106        continue;
107      }
108
109      if (chown(ptr, uid, gid) || chmod(ptr, mode))
110        perror_msg("line %d: can't chown/chmod '%s'", line_no, ptr);
111    }
112  }
113  free(line);
114  if (fp != stdin) fclose(fp);
115}
116