cargo-online-mode configure argument

Passing --enable-cargo-online-mode during configure allows cargo to make
network requests while building Tor or running tests. If this flag is
not supplied, the dependencies need to be available in the form of a
local mirror.

src/rust/tor_util/include.am

@@ -7,6 +7,6 @@ EXTRA_DIST +=\
 src/rust/target/release/libtor_util.a: FORCE
 	( cd "$(abs_top_srcdir)/src/rust/tor_util" ; \
 		CARGO_TARGET_DIR="$(abs_top_builddir)/src/rust/target" \
-		$(CARGO) build --release --quiet --frozen )
+		$(CARGO) build --release --quiet $(CARGO_ONLINE) )
 
 FORCE:

src/test/include.am

@@ -7,7 +7,8 @@ TESTS_ENVIRONMENT = \
 	export abs_top_srcdir="$(abs_top_srcdir)"; \
 	export builddir="$(builddir)"; \
 	export TESTING_TOR_BINARY="$(TESTING_TOR_BINARY)"; \
-	export CARGO="$(CARGO)";
+	export CARGO="$(CARGO)"; \
+	export CARGO_ONLINE="$(CARGO_ONLINE)";
 
 TESTSCRIPTS = \
 	src/test/fuzz_static_testcases.sh \

src/test/test_rust.sh

@@ -7,7 +7,7 @@ exitcode=0
 
 for crate in $crates; do
     cd "${abs_top_srcdir:-.}/src/rust/${crate}"
-    "${CARGO:-cargo}" test --frozen || exitcode=1
+    "${CARGO:-cargo}" test ${CARGO_ONLINE-"--frozen"} || exitcode=1
 done
 
 exit $exitcode