[CRIU] [PATCH 2/3] vzctl: add ability to skip creation of veth devices

[Andrey Vagin]

It will be used for resuming CT with help CRIU.
CRIU restores veth devices and configures them inside CT,
so vzctl should configures them on the host side.

Signed-off-by: Andrey Vagin <avagin at openvz.org>
---
 include/types.h              |  2 ++
 scripts/vps-netns_dev_add.in |  5 ++++-
 src/lib/hooks_ct.c           | 10 ++++++++--
 src/lib/veth.c               |  8 +++++---
 4 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/include/types.h b/include/types.h
index a715a5a..63919b9 100644
--- a/include/types.h
+++ b/include/types.h
@@ -49,6 +49,7 @@ typedef unsigned envid_t;
 #define YES		1
 #define NO		2
 
+#define CFG		2
 #define ADD		0
 #define DEL		1
 
@@ -99,6 +100,7 @@ typedef enum {
 	SKIP_ACTION_SCRIPT =	(1<<2),
 	SKIP_UMOUNT =		(1<<3),
 	SKIP_REMOUNT =		(1<<4),
+	SKIP_VETH_CREATE =	(1<<5),
 } skipFlags;
 
 /** CT handler.
diff --git a/scripts/vps-netns_dev_add.in b/scripts/vps-netns_dev_add.in
index 60461e4..12e0eaa 100755
--- a/scripts/vps-netns_dev_add.in
+++ b/scripts/vps-netns_dev_add.in
@@ -40,11 +40,14 @@
 vzcheckvar VEID
 vzcheckvar VNAME
 vzcheckvar HNAME
+vzcheckvar ACTION
 
 if [ "x$HNAME" = "x$VNAME" ]; then
 	vzmoveif
 else
-	vzcreatepair
+	if [ "$ACTION" = "add" ]; then
+		vzcreatepair
+	fi
 	vzadjustmacs
 	vzconfbridge
 fi
diff --git a/src/lib/hooks_ct.c b/src/lib/hooks_ct.c
index d8909b1..21e6823 100644
--- a/src/lib/hooks_ct.c
+++ b/src/lib/hooks_ct.c
@@ -815,7 +815,7 @@ static int ct_ip_ctl(vps_handler *h, envid_t veid, int op, const char *ipstr)
 static int ct_veth_ctl(vps_handler *h, envid_t veid, int op, veth_dev *dev)
 {
 	int ret = -1;
-	char *envp[10];
+	char *envp[11];
 	char buf[STR_SIZE];
 	int i = 0;
 
@@ -847,6 +847,12 @@ static int ct_veth_ctl(vps_handler *h, envid_t veid, int op, veth_dev *dev)
 		envp[i++] = strdup(buf);
 	}
 
+	if (op == ADD)
+		snprintf(buf, sizeof(buf), "ACTION=add");
+	else
+		snprintf(buf, sizeof(buf), "ACTION=cfg");
+	envp[i++] = strdup(buf);
+
 	envp[i] = NULL;
 
 	if (op == ADD) {
@@ -970,7 +976,7 @@ static int ct_restore(vps_handler *h, envid_t veid, vps_param *vps_p, int cmd,
 	cpt_param *param, skipFlags skip)
 {
 	return vps_start_custom(h, veid, vps_p,
-			SKIP_CONFIGURE | SKIP_ACTION_SCRIPT | skip,
+			SKIP_CONFIGURE | SKIP_ACTION_SCRIPT | SKIP_VETH_CREATE | skip,
 			NULL, ct_restore_fn, param);
 }
 
diff --git a/src/lib/veth.c b/src/lib/veth.c
index 2b63774..b1956fa 100644
--- a/src/lib/veth.c
+++ b/src/lib/veth.c
@@ -111,9 +111,9 @@ static int veth_ctl(vps_handler *h, envid_t veid, int op, veth_param *list,
 			break;
 	}
 	logger(0, 0, "%s veth devices: %s",
-		op == ADD ? "Configure" : "Deleting", buf);
+		(op == ADD || op == CFG) ? "Configure" : "Deleting", buf);
 	list_for_each(tmp, dev_h, list) {
-		if (op == ADD) {
+		if (op == ADD || op == CFG) {
 			if ((ret = h->veth_ctl(h, veid, ADD, tmp)))
 				break;
 			if ((ret = run_vznetcfg(veid, tmp)))
@@ -407,8 +407,10 @@ int vps_setup_veth(vps_handler *h, envid_t veid, dist_actions *actions,
 		veth_ctl(h, veid, DEL, veth_del, 0);
 	}
 	if (!list_empty(&veth_add->dev)) {
+		int op = (skip & SKIP_VETH_CREATE) ? CFG : ADD;
+
 		fill_veth_dev_name(&veth_old, veth_add);
-		ret = veth_ctl(h, veid, ADD, veth_add, 1);
+		ret = veth_ctl(h, veid, op, veth_add, 1);
 	}
 	if (!list_empty(&veth_old.dev))
 		free_veth_param(&veth_old);
-- 
1.8.2