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
8 USE_MAKEDEVS(NEWTOY(makedevs, "<1>1d:", TOYFLAG_USR|TOYFLAG_BIN))
9
10 config 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
GLOBALS(char * d;)38 GLOBALS(
39 char *d;
40 )
41
42 void 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