1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <unistd.h>
5 #include <sys/reboot.h>
6 #include <sys/wait.h>
7
8 const char *mkfs = "/system/bin/make_ext4fs";
9
setup_fs(const char * blockdev)10 int setup_fs(const char *blockdev)
11 {
12 char buf[256], path[128];
13 pid_t child;
14 int status, n;
15
16 /* we might be looking at an indirect reference */
17 n = readlink(blockdev, path, sizeof(path) - 1);
18 if (n > 0) {
19 path[n] = 0;
20 if (!memcmp(path, "/dev/block/", 11))
21 blockdev = path + 11;
22 }
23
24 if (strchr(blockdev,'/')) {
25 fprintf(stderr,"not a block device name: %s\n", blockdev);
26 return 0;
27 }
28
29 sprintf(buf,"/sys/fs/ext4/%s", blockdev);
30 if (access(buf, F_OK) == 0) {
31 fprintf(stderr,"device %s already has a filesystem\n", blockdev);
32 return 0;
33 }
34 sprintf(buf,"/dev/block/%s", blockdev);
35
36 fprintf(stderr,"+++\n");
37
38 child = fork();
39 if (child < 0) {
40 fprintf(stderr,"error: fork failed\n");
41 return 0;
42 }
43 if (child == 0) {
44 execl(mkfs, mkfs, buf, NULL);
45 exit(-1);
46 }
47
48 while (waitpid(-1, &status, 0) != child) ;
49
50 fprintf(stderr,"---\n");
51 return 1;
52 }
53
54
main(int argc,char ** argv)55 int main(int argc, char **argv)
56 {
57 int need_reboot = 0;
58
59 while (argc > 1) {
60 if (strlen(argv[1]) < 128)
61 need_reboot |= setup_fs(argv[1]);
62 argv++;
63 argc--;
64 }
65
66 if (need_reboot) {
67 sync();
68 sync();
69 sync();
70 fprintf(stderr,"REBOOT!\n");
71 reboot(RB_AUTOBOOT);
72 exit(-1);
73 }
74 return 0;
75 }
76