int lvm_compare_lv_attr(const char *path, int pos, const char expected)
{
struct lxc_popen_FILE *f;
int ret, status;
size_t len;
char *cmd;
char output[12];
int start = 0;
const char *lvscmd = "lvs --unbuffered --noheadings -o lv_attr %s 2>/dev/null";
len = strlen(lvscmd) + strlen(path) + 1;
cmd = alloca(len);
ret = snprintf(cmd, len, lvscmd, path);
if (ret < 0 || (size_t)ret >= len)
return -1;
f = lxc_popen(cmd);
if (!f) {
SYSERROR("popen failed");
return -1;
}
ret = 0;
if (!fgets(output, 12, f->f))
ret = 1;
status = lxc_pclose(f);
/* Assume either vg or lvs do not exist, default comparison to false. */
if (ret || WEXITSTATUS(status))
return 0;
len = strlen(output);
while (start < len && output[start] == ' ')
start++;
if (start + pos < len && output[start + pos] == expected)
return 1;
return 0;
}
int zfs_list_entry(const char *path, char *output, size_t inlen)
{
struct lxc_popen_FILE *f;
int found=0;
f = lxc_popen("zfs list 2> /dev/null");
if (f == NULL) {
SYSERROR("popen failed");
return 0;
}
while (fgets(output, inlen, f->f)) {
if (strstr(output, path)) {
found = 1;
break;
}
}
(void) lxc_pclose(f);
return found;
}