Initial support for building embedded ceph and calling it from a go cmd

.gitignore

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+bin/
+tools/
+vendor/
+

.gitmodules

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 [submodule "ceph"]
 	path = ceph
 	url = [email protected]:quantum/ceph
+	branch = wip-embedded-ceph

Makefile

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+ifeq ($(origin VERSION), undefined)
+	VERSION != git describe --dirty --always
+endif
+
+REPOPATH = github.com/quantum/castle
+
+GOOS=$(shell go env GOOS)
+GOARCH=$(shell go env GOARCH)
+
+NPROCS:=1
+ifeq ($(GOOS),linux)
+  NPROCS:=$(shell grep -c ^processor /proc/cpuinfo)
+endif
+
+build: vendor ceph/build/lib/libcephd.a
+	@for i in castled; do \
+		go build -o bin/$$i -installsuffix cgo -ldflags "-extldflags '-static' -linkmode external -X $(REPOPATH)/version.Version=$(VERSION)" ./cmd/$$i; \
+	done
+
+ceph/build/Makefile:
+	git submodule update --init --recursive
+	cd ceph && ./do_cmake.sh -DWITH_EMBEDDED=ON -DWITH_FUSE=OFF
+
+ceph/build/lib/libcephd.a: ceph/build/Makefile
+	cd ceph/build && make -j$(NPROCS) cephd
+
+test: tools/glide
+	go test --race $(shell ./tools/glide novendor)
+
+vet: tools/glide
+	go vet $(shell ./tools/glide novendor)
+
+fmt: tools/glide
+	go fmt $(shell ./tools/glide novendor)
+
+clean:
+	rm -rf ./bin
+	cd ceph/build && make clean
+
+cleanall: clean
+	rm -rf bin tools vendor
+
+vendor: tools/glide
+	./tools/glide install
+
+tools/glide:
+	@echo "Downloading glide"
+	mkdir -p tools
+	curl -L https://github.com/Masterminds/glide/releases/download/v0.11.1/glide-v0.11.1-$(GOOS)-$(GOARCH).tar.gz | tar -xz -C tools
+	mv tools/$(GOOS)-$(GOARCH)/glide tools/glide
+	rm -r tools/$(GOOS)-$(GOARCH)

README.md

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+# Castle - Software Defined Storage
+

cmd/castled/main.go

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+package main
+
+// #cgo CFLAGS: -I${SRCDIR}/../../ceph/src/include
+// #cgo LDFLAGS: -L${SRCDIR}/../../ceph/build/lib -lcephd -lstdc++
+// #include "cephd/libcephd.h"
+import "C"
+
+import (
+    "fmt"
+
+    "github.com/quantum/castle/version"
+    "github.com/spf13/cobra"
+)
+
+func CephVersion() (string) {
+    var c_major, c_minor, c_patch C.int
+    return C.GoString(C.ceph_version(&c_major,&c_minor,&c_patch))
+}
+
+func main() {
+
+    var cmdVersion = &cobra.Command{
+        Use:   "version",
+        Short: "print castle version",
+        Long: `prints the version of castle.`,
+        Run: func(cmd *cobra.Command, args []string) {
+            fmt.Printf("castled version %v (ceph version %v)\n", version.Version, CephVersion())
+        },
+    }
+
+    var rootCmd = &cobra.Command{Use: "castled"}
+    rootCmd.AddCommand(cmdVersion)
+    rootCmd.Execute()
+}

glide.yaml

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+package: github.com/quantum/castle
+import:
+- package: github.com/spf13/cobra
+  subpackages:
+  - cobra

version/version.go

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+package version
+
+var Version = "0.0.0"