lib/crate.py: additionally populate a local registry

The local registry is a more future-proof way to prevent cargo from
accessing the network during the build.  Unfortunately, this is only
used during the build of cargo-native for now.  The snapshot used while
building cargo-native supports using a local registry ("source
replacement") however the version of cargo supported by rust 1.10 does
not.

Until we can build a new-enough version of cargo that supports
source-replacement, we'll have to patch cargo directly to prevent it
from accessing the network.  Once we do have a new-enough cargo, we can
stop populating cargo_home/registry and only create cargo_registry.

classes/cargo_util.bbclass

@@ -76,6 +76,15 @@ cargo_util_do_configure () {
 		printf "\"%s\"\n" "$p"
 	done | sed -e 's/$/,/' >> ${CARGO_HOME}/config
 	echo "]" >> ${CARGO_HOME}/config
+
+	# Point cargo at our local mirror of the registry
+	cat >> ${CARGO_HOME}/config <<EOF
+[source.local]
+local-registry = "${WORKDIR}/cargo_registry"
+[source.crates-io]
+replace-with = "local"
+registry = "https://github.com/rust-lang/crates.io-index"
+EOF
 }
 
 cargo_util_do_compile () {

lib/crate.py

@@ -47,6 +47,9 @@ class Crate(Wget):
     def _cargo_cache_path(self, rootdir):
         return self._cargo_path(rootdir, "cache")
 
+    def _cargo_registry_path(self, rootdir, component=""):
+        return os.path.join(rootdir, "cargo_registry", component)
+
     def supports(self, ud, d):
         """
         Check to see if a given url is for this fetcher
@@ -132,13 +135,18 @@ class Crate(Wget):
             super(Crate, self).unpack(ud, rootdir, d)
 
     def _index_unpack(self, ud, rootdir, d):
+        cargo_index = self._cargo_index_path(rootdir)
+        self._index_unpack_to(ud, rootdir, d, cargo_index)
+
+        cargo_registry_index = self._cargo_registry_path(rootdir, "index")
+        self._index_unpack_to(ud, rootdir, d, cargo_registry_index)
+
+    def _index_unpack_to(self, ud, rootdir, d, cargo_index):
         """
         Unpacks the index
         """
         thefile = ud.localpath
 
-        cargo_index = self._cargo_index_path(rootdir)
-
         cmd = "tar -xz --no-same-owner --strip-components 1 -f %s -C %s" % (thefile, cargo_index)
 
         # change to the rootdir to unpack but save the old working dir
@@ -177,16 +185,21 @@ class Crate(Wget):
         else:
             cargo_src = self._cargo_src_path(rootdir)
             cargo_cache = self._cargo_cache_path(rootdir)
+            cargo_registry = self._cargo_registry_path(rootdir)
 
             cmd = "tar -xz --no-same-owner -f %s -C %s" % (thefile, cargo_src)
 
             # ensure we've got these paths made
             bb.utils.mkdirhier(cargo_cache)
+            bb.utils.mkdirhier(cargo_registry)
             bb.utils.mkdirhier(cargo_src)
 
             bb.note("Copying %s to %s/" % (thefile, cargo_cache))
             shutil.copy(thefile, cargo_cache)
 
+            bb.note("Copying %s to %s/" % (thefile, cargo_registry))
+            shutil.copy(thefile, cargo_registry)
+
         # path it
         path = d.getVar('PATH', True)
         if path: