cargo: wire up bitbake to fetch cargo snapshot

This is based on Steven Walter's proposed commit "cargo.inc: use bitbake
to fetch the snapshot"

recipes/cargo/cargo.inc

@@ -14,6 +14,7 @@ DEPENDS = "openssl zlib libgit2 curl ca-certificates libssh2"
 SRC_URI = "\
 	git://github.com/rust-lang/cargo.git;protocol=https;name=cargo \
 	git://github.com/rust-lang/rust-installer.git;protocol=https;name=rust-installer;destsuffix=git/src/rust-installer \
+	http://static-rust-lang-org.s3.amazonaws.com/cargo-dist/${CARGO_SNAPSHOT} \
 "
 
 LIC_FILES_CHKSUM ="\
@@ -58,6 +59,11 @@ do_configure () {
 
 do_compile () {
 	oe_cargo_fix_env
+
+	rm -rf target/snapshot
+	mkdir -p target
+	cp -R ${WORKDIR}/$(basename ${CARGO_SNAPSHOT} .tar.gz) target/snapshot
+
 	oe_runmake ARGS="--verbose"
 }
 

recipes/cargo/cargo_git.bb

@@ -41,3 +41,7 @@ EXTRA_OECARGO_PATHS = "\
 ## Failed to resolve path '/home/cody/obj/y/tmp/work/x86_64-linux/cargo-native/git+gitAUTOINC+0b84923203_9181ea8f4e_8baa8ccb39-r0/curl-rust/curl-sys/curl/.git': No such file or directory
 SRCREV_curl = "ac30e9a7746c8641f4871e59b831ec28530c5c73"
 SRCREV_libgit2 = "3b48f7f30c271ec9569f722215ee55cc5e922242"
+
+CARGO_SNAPSHOT = "2015-04-02/cargo-nightly-x86_64-unknown-linux-gnu.tar.gz"
+SRC_URI[md5sum] = "3d62194d02a9088cd8aae379e9498134"
+SRC_URI[sha256sum] = "16b6338ba2942989693984ba4dbd057c2801e8805e6da8fa7b781b00e722d117"