zdtm: add ability to execute non-namespacess tests concurrently

For that zdtm.sh is executed in pidns to avoid pid conflicts.

Cc: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/Makefile

@@ -18,9 +18,7 @@ other: .FORCE
 
 zdtm: .FORCE 
 	$(MAKE) zdtm_ns
-	for t in $(shell echo "$(TST)" | tr ' ' '\n' | grep -Pv $(EXP)); do \
-		$(MAKE) $$t || break;	\
-	done
+	$(MAKE) zdtm_nons
 .PHONY: zdtm
 
 fault-injection: .FORCE
@@ -28,7 +26,9 @@ fault-injection: .FORCE
 .PHONY: fault-injection
 
 zdtm_ns: $(shell echo "$(TST)" | tr ' ' '\n' | grep -P $(EXP))
+zdtm_nons: $(shell echo "$(TST)" | tr ' ' '\n' | grep -vP $(EXP))
+
 $(TST):
-	./zdtm.sh ${ZDTM_ARGS} $(@) &> $(subst /,_,$@).log || \
+	./zdtm.sh --ct ${ZDTM_ARGS} $(@) &> $(subst /,_,$@).log || \
 	{ flock Makefile cat $(subst /,_,$@).log; exit 1; }
 .PHONY: zdtm_ns

test/zdtm.sh

@@ -763,6 +763,7 @@ Options:
 	-P : Make pre-dump instead of dump on all iterations except the last one
 	-s : Make iterative snapshots. Only the last one will be checked.
 	--auto-dedup : Make auto-dedup on restore. Check sizes of pages imges, it must be zero.
+	--ct : re-execute $0 in a container
 EOF
 }
 
@@ -869,6 +870,26 @@ while :; do
 		usage
 		exit 0
 		;;
+	  --ct)
+		[ -z "$ZDTM_SH_IN_CT" ] && {
+			export ZDTM_SH_IN_CT=1
+			shift
+			args="$@"
+			# pidns is used to avoid conflicts
+			# mntns is used to mount /proc
+			# net is used to avoid conflicts of parasite sockets
+			unshare --pid --mount --ipc --net -- bash -c "
+				(
+					ip link set up dev lo &&
+					mount --make-rprivate / &&
+					umount -l /proc &&
+					mount -t proc proc /proc/ &&
+					./zdtm.sh $args
+				)"
+			exit
+		}
+		shift
+		;;
 	  -*)
 		echo "Unrecognized option $1, aborting!" 1>&2
 		usage