Patch lxc-attach to return correct returncode

apk/lxc/APKBUILD

@@ -42,6 +42,7 @@ source="https://linuxcontainers.org/downloads/lxc/lxc-$_pkgver.tar.gz
 	cgroups-initialize-cpuset-properly.patch
 	network-restore-ability-to-move-nl80211-devices.patch
 	execute-attach-user-group.patch
+	attach-returncode.patch
 	lxc.initd
 	lxc.confd
 	"
@@ -172,5 +173,6 @@ sha512sums="4b3046fc6c4aa497fb26bd45839e60de503184af86d3966e796d14e619203536b9a9
 2bebe6cc24987354b6e7dc9003c3a4df450ca10263e6dc0e9313977fdfc2eb57c0d68560da4d1071c8de2f8e3e394ed3ca17af445bea524daa5f8ae8955b3ba6  cgroups-initialize-cpuset-properly.patch
 d302b7296918680901d034dc12ae0687dbbc65766800a9f7256e661f638d3dcad66bcc737aec2c6de8c27d3b9c08833e00420c2064f356d6d73efda9ae9bd707  network-restore-ability-to-move-nl80211-devices.patch
 a26cd718760e73309a686242b03c5de5ceff17ab9c348438cd19d2d875696e5c788f0e04d66dd01e08449754c14ce2b7cc1dfc1bac2a64429ccf4462f8aa93a5  execute-attach-user-group.patch
+565b7c1774b19f66cc3435557325b75c85203bae4e53db1677580f4b93c4fb2db7f9bd9dd02b956b18bc2730b8645984e790f27162510d642ce7647df21febc0  attach-returncode.patch
 b74ffe7c3e8f193265a90ffeb6e5743b1212bc1416b898e5a7e59ddd7f06fc77dc34e2dcbb3614038ac6222a95e2b9beb9f03ab734c991837203ab626b1b091f  lxc.initd
 91de43db5369a9e10102933514d674e9c875218a1ff2910dd882e5b9c308f9e430deacb13d1d7e0b2ed1ef682d0bb035aa6f8a6738f54fa2ca3a05acce04e467  lxc.confd"

apk/lxc/attach-returncode.patch

@@ -0,0 +1,15 @@
+--- a/src/lxc/tools/lxc_attach.c
++++ b/src/lxc/tools/lxc_attach.c
+@@ -385,10 +385,9 @@
+ 		ret = lxc_wait_for_pid_status(pid);
+ 		if (ret < 0)
+ 			goto out;
+-
+-		if (WIFEXITED(ret))
+-			wexit = WEXITSTATUS(ret);
+ 	}
++	if (WIFEXITED(ret))
++		wexit = WEXITSTATUS(ret);
+ 
+ out:
+ 	lxc_container_put(c);

lxc-services/mariadb/image

@@ -18,5 +18,5 @@ EOF
 COPY image.d
 
 CMD /bin/s6-svscan /etc/services.d
-READY /bin/sh -c "echo 'SELECT version()'| mysql"
+READY /usr/bin/test -e /run/mysqld/mysqld.sock
 HALT SIGTERM