static void test_fstab_find_pri(void) {
int pri = -1;
assert_se(fstab_find_pri("pri", &pri) == 0);
assert_se(pri == -1);
assert_se(fstab_find_pri("pri=11", &pri) == 1);
assert_se(pri == 11);
assert_se(fstab_find_pri("opt,pri=12,opt", &pri) == 1);
assert_se(pri == 12);
assert_se(fstab_find_pri("opt,opt,pri=12,pri=13", &pri) == 1);
assert_se(pri == 13);
}
static int add_swap(
const char *what,
struct mntent *me,
bool noauto,
bool nofail) {
_cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL, *filtered = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r, pri = -1;
const char *opts;
assert(what);
assert(me);
if (access("/proc/swaps", F_OK) < 0) {
log_info("Swap not supported, ignoring fstab swap entry for %s.", what);
return 0;
}
if (detect_container(NULL) > 0) {
log_info("Running in a container, ignoring fstab swap entry for %s.", what);
return 0;
}
opts = me->mnt_opts;
r = fstab_find_pri(opts, &pri);
if (r < 0) {
log_error_errno(r, "Failed to parse priority, ignoring: %m");
/* Remove invalid pri field */
r = fstab_filter_options(opts, "pri\0", NULL, NULL, &filtered);
if (r < 0)
return log_error_errno(r, "Failed to parse options: %m");
opts = filtered;
}
name = unit_name_from_path(what, ".swap");
if (!name)
return log_oom();
unit = strjoin(arg_dest, "/", name, NULL);
if (!unit)
return log_oom();
f = fopen(unit, "wxe");
if (!f) {
if (errno == EEXIST)
log_error("Failed to create swap unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit);
else
log_error_errno(errno, "Failed to create unit file %s: %m", unit);
return -errno;
}
fprintf(f,
"# Automatically generated by systemd-fstab-generator\n\n"
"[Unit]\n"
"SourcePath=/etc/fstab\n"
"Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n\n"
"[Swap]\n"
"What=%s\n",
what);
/* Note that we currently pass the priority field twice, once
* in Priority=, and once in Options= */
if (pri >= 0)
fprintf(f, "Priority=%i\n", pri);
if (!isempty(opts) && !streq(opts, "defaults"))
fprintf(f, "Options=%s\n", opts);
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to write unit file %s: %m", unit);
/* use what as where, to have a nicer error message */
r = generator_write_timeouts(arg_dest, what, what, opts, NULL);
if (r < 0)
return r;
if (!noauto) {
lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET,
nofail ? ".wants/" : ".requires/", name, NULL);
if (!lnk)
return log_oom();
mkdir_parents_label(lnk, 0755);
if (symlink(unit, lnk) < 0)
return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
}
return 0;
}
