give explicit error when the cgroup are not found

When the cgroup is not mounted, we silently exit without giving
some clues to the user with what is happening.

Give some info and an explicit error.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>

diff --git a/src/lxc/cgroup.c b/src/lxc/cgroup.c
index a2b823e2b0f821fea4e8e46804e0548e646089dc..6ae67bd0dbdb4c178aa9ba37520b2520233d2850 100644 (file)
--- a/src/lxc/cgroup.c
+++ b/src/lxc/cgroup.c
@@ -240,6 +240,7 @@ int lxc_cgroup_create(const char *name, pid_t pid)
        struct mntent *mntent;
        FILE *file = NULL;
        int err = -1;
+       int found = 0;
 
        file = setmntent(MTAB, "r");
        if (!file) {
@@ -253,13 +254,18 @@ int lxc_cgroup_create(const char *name, pid_t pid)
 
                if (!strcmp(mntent->mnt_type, "cgroup")) {
 
-                       INFO("found cgroup mounted at '%s'", mntent->mnt_dir);
+                       INFO("[%d] found cgroup mounted at '%s',opts='%s'",
+                            ++found, mntent->mnt_dir, mntent->mnt_opts);
+
                        err = lxc_one_cgroup_create(name, mntent, pid);
                        if (err)
                                goto out;
                }
        };
 
+       if (!found)
+               ERROR("No cgroup mounted on the system");
+
 out:
        endmntent(file);
        return err;