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/* upstart
*
* test_util_check_env.c - meta test to ensure environment sane for
* running tests.
*
* Copyright © 2013 Canonical Ltd.
* Author: James Hunt <james.hunt@canonical.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <limits.h>
#include <unistd.h>
#include <mntent.h>
#include <sys/vfs.h>
#include <nih/string.h>
#include <nih/test.h>
#include <nih/logging.h>
#include "test_util_common.h"
#ifndef OVERLAYFS_SUPER_MAGIC
#define OVERLAYFS_SUPER_MAGIC 0x794c764f
#endif
/**
* check_for_overlayfs:
*
* Determine if the mount point used by the tests for creating temporary
* files is using overlayfs.
*
* Returns: TRUE if temporary work area is on overlayfs, else FALSE.
**/
int
check_for_overlayfs (void)
{
struct statfs statbuf;
char path[PATH_MAX];
int found = FALSE;
/* Create a file in the temporary work area */
TEST_FILENAME (path);
fclose (fopen (path, "w"));
/* Check it exits */
assert0 (statfs (path, &statbuf));
if (statbuf.f_type == OVERLAYFS_SUPER_MAGIC) {
nih_warn ("Mountpoint for '%s' (needed by the Upstart tests) is an overlayfs "
"filesystem, which does not support inotify.",
path);
found = TRUE;
}
assert0 (unlink (path));
return found;
}
#ifdef ENABLE_CGROUPS
void print_my_cgroup(void)
{
char *str;
str = get_pid_cgroup("freezer", getpid());
if (str) {
nih_warn("I am in freezer cgroup: %s", str);
TEST_EQ_STR(str, "/");
nih_free(str);
} else {
TEST_FAILED("Failed to get my freezer cgroup");
}
}
char *get_my_cgroup()
{
char line[1024], *ret = NULL;
FILE *f = fopen("/proc/self/cgroup", "r");
while (fgets(line, 1024, f)) {
char *p, *p2;
if ((p = strchr(line, ':')) == NULL)
continue;
p++;
if ((p2 = strchr(p, ':')) == NULL)
continue;
if (strncmp(p, "name=", 5) == 0)
continue;
ret = NIH_MUST( nih_strdup(NULL, p2+1) );
break;
}
fclose(f);
return ret;
}
int check_cgroup_sandbox(void)
{
char *cg_prev = NULL, *cg_post = NULL;
int ret = -1;
cg_prev = get_my_cgroup();
if (!cg_prev)
return -1;
if (setup_cgroup_sandbox() < 0) {
nih_free(cg_prev);
return -1;
}
cg_post = get_my_cgroup();
if (!cg_post) {
nih_free(cg_prev);
return -1;
}
/* we should have moved cgroups, so the two should be different */
if (strcmp(cg_prev, cg_post) != 0) {
nih_warn("setup_cgroup_sandbox moved me from %s to %s",
cg_prev, cg_post);
ret = 0;
}
nih_free(cg_prev);
nih_free(cg_post);
return ret;
}
#endif /* ENABLE_CGROUPS */
/**
* test_checks:
*
* Perform any checks necessary before real tests are run.
**/
void
test_checks (void)
{
int ret;
TEST_GROUP ("test environment");
/*
* Warn (*) if overlayfs detected.
*
* (*) - Don't fail in the hope that one day someone might fix
* overlayfs.
*/
TEST_FEATURE ("checking for overlayfs");
if (check_for_overlayfs ()) {
nih_warn ("Found overlayfs mounts");
nih_warn ("This environment will probably cause tests to fail mysteriously!!");
nih_warn ("See bug LP:#882147 for further details.");
}
#ifdef ENABLE_CGROUPS
if (file_exists ("/sys/fs/cgroup/cgmanager/sock")) {
TEST_FEATURE ("checking for cgmanager");
ret = connect_to_cgmanager ();
switch (ret) {
case -2:
nih_warn ("Found no cgroup manager");
goto out_skip;
case -1:
nih_warn ("Error connecting to cgmanager");
goto out_skip;
case 0:
print_my_cgroup ();
break;
default: nih_warn ("Unknown error from connect_to_cgmanager: %d", ret);
goto out_skip;
}
TEST_FEATURE ("cgroup sandbox");
if (check_cgroup_sandbox() != 0)
nih_warn ("Could not create cgroup sandbox");
} else {
nih_warn ("Skipping CGManager tests, CGManager socket not found");
}
out_skip:
disconnect_cgmanager();
if (ret)
nih_warn ("Skipping CGManager tests, CGManager not properly configured");
#endif /* ENABLE_CGROUPS */
}
int
main (int argc,
char *argv[])
{
test_checks ();
return 0;
}
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