support lxc.mount.auto for get_config_item and clear_config_item

src/lxc/conf.c

@@ -4102,6 +4102,12 @@ int lxc_clear_mount_entries(struct lxc_conf *c)
 	return 0;
 }
 
+int lxc_clear_automounts(struct lxc_conf *c)
+{
+	c->auto_mounts = 0;
+	return 0;
+}
+
 int lxc_clear_hooks(struct lxc_conf *c, const char *key)
 {
 	struct lxc_list *it,*next;

src/lxc/conf.h

@@ -358,6 +358,7 @@ extern int lxc_clear_config_caps(struct lxc_conf *c);
 extern int lxc_clear_config_keepcaps(struct lxc_conf *c);
 extern int lxc_clear_cgroups(struct lxc_conf *c, const char *key);
 extern int lxc_clear_mount_entries(struct lxc_conf *c);
+extern int lxc_clear_automounts(struct lxc_conf *c);
 extern int lxc_clear_hooks(struct lxc_conf *c, const char *key);
 extern int lxc_clear_idmaps(struct lxc_conf *c);
 extern int lxc_clear_groups(struct lxc_conf *c);

src/lxc/confile.c

@@ -1941,6 +1941,40 @@ static int lxc_get_mount_entries(struct lxc_conf *c, char *retv, int inlen)
 	return fulllen;
 }
 
+static int lxc_get_auto_mounts(struct lxc_conf *c, char *retv, int inlen)
+{
+	int len, fulllen = 0;
+
+	if (!retv)
+		inlen = 0;
+	else
+		memset(retv, 0, inlen);
+
+	if (!(c->auto_mounts & LXC_AUTO_ALL_MASK))
+		return 0;
+
+	switch (c->auto_mounts & LXC_AUTO_PROC_MASK) {
+		case LXC_AUTO_PROC_MIXED:        strprint(retv, inlen, "proc:mixed\n"); break;
+		case LXC_AUTO_PROC_RW:           strprint(retv, inlen, "proc:rw");      break;
+		default: break;
+	}
+	switch (c->auto_mounts & LXC_AUTO_SYS_MASK) {
+		case LXC_AUTO_SYS_RO:            strprint(retv, inlen, "sys:ro");            break;
+		case LXC_AUTO_SYS_RW:            strprint(retv, inlen, "sys:rw");            break;
+		default: break;
+	}
+	switch (c->auto_mounts & LXC_AUTO_CGROUP_MASK) {
+		case LXC_AUTO_CGROUP_MIXED:      strprint(retv, inlen, "cgroup:mixed");      break;
+		case LXC_AUTO_CGROUP_RO:         strprint(retv, inlen, "cgroup:ro");         break;
+		case LXC_AUTO_CGROUP_RW:         strprint(retv, inlen, "cgroup:rw");         break;
+		case LXC_AUTO_CGROUP_FULL_MIXED: strprint(retv, inlen, "cgroup-full:mixed"); break;
+		case LXC_AUTO_CGROUP_FULL_RO:    strprint(retv, inlen, "cgroup-full:ro");    break;
+		case LXC_AUTO_CGROUP_FULL_RW:    strprint(retv, inlen, "cgroup-full:rw");    break;
+		default: break;
+	}
+	return fulllen;
+}
+
 /*
  * lxc.network.0.XXX, where XXX can be: name, type, link, flags, type,
  * macvlan.mode, veth.pair, vlan, ipv4, ipv6, script.up, hwaddr, mtu,
@@ -2074,6 +2108,8 @@ int lxc_get_config_item(struct lxc_conf *c, const char *key, char *retv,
 
 	if (strcmp(key, "lxc.mount.entry") == 0)
 		return lxc_get_mount_entries(c, retv, inlen);
+	else if (strcmp(key, "lxc.mount.auto") == 0)
+		return lxc_get_auto_mounts(c, retv, inlen);
 	else if (strcmp(key, "lxc.mount") == 0)
 		v = c->fstab;
 	else if (strcmp(key, "lxc.tty") == 0)
@@ -2151,6 +2187,8 @@ int lxc_clear_config_item(struct lxc_conf *c, const char *key)
 		return lxc_clear_cgroups(c, key);
 	else if (strcmp(key, "lxc.mount.entries") == 0)
 		return lxc_clear_mount_entries(c);
+	else if (strcmp(key, "lxc.mount.auto") == 0)
+		return lxc_clear_automounts(c);
 	else if (strncmp(key, "lxc.hook", 8) == 0)
 		return lxc_clear_hooks(c, key);
 	else if (strncmp(key, "lxc.group", 9) == 0)