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/* makedevs.c - Make ranges of device files.
*
* Copyright 2014 Bilal Qureshi <bilal.jmi@gmail.com>
* Copyright 2014 Kyungwan Han <asura321@gmail.com>
*
* No Standard
USE_MAKEDEVS(NEWTOY(makedevs, "<1>1d:", TOYFLAG_USR|TOYFLAG_BIN))
config MAKEDEVS
bool "makedevs"
default y
help
usage: makedevs [-d device_table] rootdir
Create a range of special files as specified in a device table.
-d file containing device table (default reads from stdin)
Each line of of the device table has the fields:
<name> <type> <mode> <uid> <gid> <major> <minor> <start> <increment> <count>
Where name is the file name, and type is one of the following:
b Block device
c Character device
d Directory
f Regular file
p Named pipe (fifo)
Other fields specify permissions, user and group id owning the file,
and additional fields for device special files. Use '-' for blank entries,
unspecified fields are treated as '-'.
*/
#define FOR_makedevs
#include "toys.h"
GLOBALS(
char *fname;
)
void makedevs_main()
{
int value, fd = 0, line_no, i;
char *line = NULL;
// Open file and chdir, verbosely
xprintf("rootdir = %s\n", *toys.optargs);
if (toys.optflags & FLAG_d && strcmp(TT.fname, "-")) {
fd = xopen(TT.fname, O_RDONLY);
xprintf("table = %s\n", TT.fname);
} else xprintf("table = <stdin>\n");
xchdir(*toys.optargs);
for (line_no = 0; (line = get_line(fd)); free(line)) {
char type=0, user[64], group[64], *node, *ptr = line;
unsigned int mode = 0755, major = 0, minor = 0, cnt = 0, incr = 0,
st_val = 0;
uid_t uid;
gid_t gid;
struct stat st;
line_no++;
while (isspace(*ptr)) ptr++;
if (!*ptr || *ptr == '#') continue;
node = ptr;
while (*ptr && !isspace(*ptr)) ptr++;
if (*ptr) *(ptr++) = 0;
*user = *group = 0;
sscanf(ptr, "%c %o %63s %63s %u %u %u %u %u", &type, &mode,
user, group, &major, &minor, &st_val, &incr, &cnt);
// type order here needs to line up with actions[] order.
i = stridx("pcbdf", type);
if (i == -1) {
error_msg("line %d: bad type %c", line_no, type);
continue;
} else mode |= (mode_t[]){S_IFIFO, S_IFCHR, S_IFBLK, 0, 0}[i];
if (*user) {
struct passwd *usr;
if (!(usr = getpwnam(user)) && isdigit(*user)) {
sscanf(user, "%u", &value);
usr = xgetpwuid(value);
}
if (!usr) error_exit("bad user '%s'", user);
uid = usr->pw_uid;
} else uid = getuid();
if (*group) {
struct group *grp;
if (!(grp = getgrnam(group)) && isdigit(*group)) {
sscanf (group, "%u", &value);
grp = getgrgid(value);
}
if (!grp) error_exit("bad group '%s'", group);
gid = grp->gr_gid;
} else gid = getgid();
while (*node == '/') node++; // using relative path
for (i = 0; (!cnt && !i) || i < cnt; i++) {
if (cnt) {
snprintf(toybuf, sizeof(toybuf), "%s%u", node, st_val + i);
ptr = toybuf;
} else ptr = node;
if (type == 'd') {
if (mkpathat(AT_FDCWD, ptr, mode, 3)) {
perror_msg("can't create directory '%s'", ptr);
continue;
}
} else if (type == 'f') {
if (stat(ptr, &st) || !S_ISREG(st.st_mode)) {
perror_msg("line %d: file '%s' does not exist", line_no, ptr);
continue;
}
} else if (mknod(ptr, mode, makedev(major, minor + i*incr))) {
perror_msg("line %d: can't create node '%s'", line_no, ptr);
continue;
}
if (chown(ptr, uid, gid) || chmod(ptr, mode))
perror_msg("line %d: can't chown/chmod '%s'", line_no, ptr);
}
}
xclose(fd);
}
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