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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "util.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
int read_one_line_file(const char *fn, char **line) {
FILE *f;
int r;
char t[LINE_MAX], *c;
assert(fn);
assert(line);
f = fopen(fn, "re");
if (!f)
return -errno;
if (!fgets(t, sizeof(t), f)) {
if (ferror(f)) {
r = -errno;
goto finish;
}
t[0] = 0;
}
c = strdup(t);
if (!c) {
r = -ENOMEM;
goto finish;
}
truncate_nl(c);
*line = c;
r = 0;
finish:
fclose(f);
return r;
}
int running_in_chroot(void) {
struct stat a, b;
zero(a);
zero(b);
/* Only works as root */
if (stat("/proc/1/root", &a) < 0)
return -errno;
if (stat("/", &b) < 0)
return -errno;
return
a.st_dev != b.st_dev ||
a.st_ino != b.st_ino;
}
bool startswith(const char *s, const char *prefix) {
size_t sl, pl;
assert(s);
assert(prefix);
sl = strlen(s);
pl = strlen(prefix);
if (pl == 0)
return true;
if (sl < pl)
return false;
return memcmp(s, prefix, pl) == 0;
}
char *truncate_nl(char *s) {
assert(s);
s[strcspn(s, NEWLINE)] = 0;
return s;
}
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