etcd: add recipe

Investigating the potential use of etcd within an OpenBMC distribution
to manage data sharing and leader election in a multi-BMC system. Start
off with a basic recipe to build the package.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>

meta-oe/recipes-extended/etcd/etcd_3.5.5.bb

@@ -0,0 +1,50 @@
+DESCRIPTION = "etcd is a distributed key-value store for distributed systems"
+HOMEPAGE = "https://etcd.io/"
+
+LICENSE = "Apache-2.0"
+LIC_FILES_CHKSUM = "file://${S}/${GO_INSTALL}/LICENSE;md5=3b83ef96387f14655fc854ddc3c6bd57"
+
+SRC_URI = "git://github.com/etcd-io/etcd;branch=release-3.5;protocol=https"
+SRCREV = "19002cfc689fba2b8f56605e5797bf79f8b61fdd"
+UPSTREAM_CHECK_COMMITS = "1"
+
+GO_IMPORT = "go.etcd.io/etcd/v3"
+GO_INSTALL = "src/${GO_IMPORT}/"
+
+RDEPENDS:${PN}-dev = " \
+    bash \
+"
+
+export GO111MODULE="on"
+
+inherit go
+
+# network is required by go to get dependent packages
+do_compile[network] = "1"
+
+# Need to build etcd out of where it is extracted to
+# Need to directly call build script vs. "make build"
+# because "make build" executes the generated binaries
+# at the end of the build which do not run correctly
+# when cross compiling for another machine
+go_do_compile:prepend() {
+    cd ${GO_INSTALL}
+    ./build.sh
+
+    # Lots of discussion in go community about how it sets packages to
+    # read-only by default -> https://github.com/golang/go/issues/31481
+    # etcd is going to need some upstream work to support it.
+    # For now, set the packages which are read-only back to
+    # writeable so things like "bitbake -c cleanall etcd" will work.
+    chmod u+w -R ${S}/src/github.com/myitcv/gobin
+    chmod u+w -R ${WORKDIR}/build/pkg/mod
+
+}
+
+do_install:append() {
+    install -d ${D}${bindir}/
+    install -m 0755 ${D}/usr/lib/go/src/go.etcd.io/etcd/v3/bin/etcd ${D}${bindir}
+    install -m 0755 ${D}/usr/lib/go/src/go.etcd.io/etcd/v3/bin/etcdctl ${D}${bindir}
+    install -m 0755 ${D}/usr/lib/go/src/go.etcd.io/etcd/v3/bin/etcdutl ${D}${bindir}
+}
+