add weavewait

binocarlos/wait-for-weave is Apache2 licensed, so attribution/etc applies. Thus, we
re-invent the wheel here.

.gitignore

@@ -33,6 +33,7 @@ coverage.html
 weaver/weaver
 weavedns/weavedns
 sigproxy/sigproxy
+weavewait/weavewait
 tools/bin
 tools/build
 releases
@@ -41,6 +42,7 @@ weavedns.tar
 weaveexec.tar
 weaveexec/proxy
 weaveexec/weave
+weaveexec/weavewait
 weaveexec/sigproxy
 weaveexec/docker*.tgz
 Vagrantfile.local

Makefile

@@ -12,6 +12,7 @@ WEAVER_EXE=weaver/weaver
 WEAVEDNS_EXE=weavedns/weavedns
 SIGPROXY_EXE=sigproxy/sigproxy
 PROXY_EXE=weaveexec/proxy
+WEAVEWAIT_EXE=weavewait/weavewait
 WEAVER_IMAGE=$(DOCKERHUB_USER)/weave
 WEAVEDNS_IMAGE=$(DOCKERHUB_USER)/weavedns
 WEAVEEXEC_IMAGE=$(DOCKERHUB_USER)/weaveexec
@@ -30,7 +31,7 @@ travis: $(WEAVER_EXE) $(WEAVEDNS_EXE)
 update:
 	go get -u -f -v -tags -netgo ./$(dir $(WEAVER_EXE)) ./$(dir $(WEAVEDNS_EXE)) ./$(dir $(SIGPROXY_EXE)) ./$(dir $(PROXY_EXE))
 
-$(WEAVER_EXE) $(WEAVEDNS_EXE) $(PROXY_EXE): common/*.go
+$(WEAVER_EXE) $(WEAVEDNS_EXE) $(PROXY_EXE) $(WEAVEWAIT_EXE): common/*.go
 	go get -tags netgo ./$(@D)
 	go build -ldflags "-extldflags \"-static\" -X main.version $(WEAVE_VERSION)" -tags netgo -o $@ ./$(@D)
 	@strings $@ | grep cgo_stub\\\.go >/dev/null || { \
@@ -45,6 +46,7 @@ $(WEAVER_EXE) $(WEAVEDNS_EXE) $(PROXY_EXE): common/*.go
 $(WEAVER_EXE): router/*.go ipam/*.go ipam/*/*.go weaver/main.go
 $(WEAVEDNS_EXE): nameserver/*.go weavedns/main.go
 $(PROXY_EXE): proxy/*.go weaveexec/main.go
+$(WEAVEWAIT_EXE): weavewait/*.go weavewait/main.go
 
 # Sigproxy needs separate rule as it fails the netgo check in the main
 # build stanza due to not importing net package
@@ -59,9 +61,10 @@ $(WEAVEDNS_EXPORT): weavedns/Dockerfile $(WEAVEDNS_EXE)
 	$(SUDO) docker build -t $(WEAVEDNS_IMAGE) weavedns
 	$(SUDO) docker save $(WEAVEDNS_IMAGE):latest > $@
 
-$(WEAVEEXEC_EXPORT): weaveexec/Dockerfile $(DOCKER_DISTRIB) weave $(SIGPROXY_EXE) $(PROXY_EXE)
+$(WEAVEEXEC_EXPORT): weaveexec/Dockerfile $(DOCKER_DISTRIB) weave $(SIGPROXY_EXE) $(PROXY_EXE) $(WEAVEWAIT_EXE)
 	cp weave weaveexec/weave
-	cp sigproxy/sigproxy weaveexec/sigproxy
+	cp $(SIGPROXY_EXE) weaveexec/sigproxy
+	cp $(WEAVEWAIT_EXE) weaveexec/weavewait
 	cp $(DOCKER_DISTRIB) weaveexec/docker.tgz
 	$(SUDO) docker build -t $(WEAVEEXEC_IMAGE) weaveexec
 	$(SUDO) docker save $(WEAVEEXEC_IMAGE):latest > $@
@@ -94,7 +97,7 @@ publish: $(PUBLISH)
 
 clean:
 	-$(SUDO) docker rmi $(WEAVER_IMAGE) $(WEAVEDNS_IMAGE) $(WEAVEEXEC_IMAGE)
-	rm -f $(WEAVER_EXE) $(WEAVEDNS_EXE) $(SIGPROXY_EXE) $(WEAVER_EXPORT) $(WEAVEDNS_EXPORT) $(WEAVEEXEC_EXPORT)
+	rm -f $(WEAVER_EXE) $(WEAVEDNS_EXE) $(SIGPROXY_EXE) $(PROXY_EXE) $(WEAVEWAIT_EXE) $(WEAVER_EXPORT) $(WEAVEDNS_EXPORT) $(WEAVEEXEC_EXPORT)
 
 build:
 	$(SUDO) go clean -i net

proxy/create_container_interceptor.go

@@ -64,7 +64,7 @@ func addToVolumesFrom(config *docker.HostConfig, mounts ...string) error {
 
 func setWeaveWaitEntrypoint(image, container *docker.Config) {
 	container.Cmd = combineEntrypoints(image, container)
-	container.Entrypoint = []string{"/home/weavewait/wait-for-weave"}
+	container.Entrypoint = []string{"/home/weavewait/weavewait"}
 }
 
 func combineEntrypoints(image, container *docker.Config) []string {

weaveexec/Dockerfile

@@ -16,9 +16,9 @@ WORKDIR /home/weave
 ADD ./weave /home/weave/
 ADD ./sigproxy /home/weave/
 ADD ./proxy /home/weave/
+ADD ./weavewait /home/weavewait/weavewait
 ADD ./docker.tgz /
 
-ADD ./wait-for-weave /home/weavewait/wait-for-weave
 VOLUME /home/weavewait
 
 ENTRYPOINT ["/home/weave/sigproxy", "/home/weave/weave"]

weavewait/main.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+
+	"github.com/weaveworks/weave/net"
+)
+
+func main() {
+	if _, err := net.EnsureInterface("ethwe", 20); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+	}
+
+	if len(os.Args) <= 1 {
+		os.Exit(0)
+	}
+	cmd := exec.Command(os.Args[1], os.Args[2:]...)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		os.Exit(1)
+	}
+}