Workaround a bug in cargo-kcov

cargo-kcov doesn't work with features and workspaces.
kennytm/cargo-kcov#39

test.sh

@@ -12,6 +12,10 @@ cargo +stable test --all
 # rustfmt screws them up.
 cargo +nightly fmt --package bfffs-fio -- --check
 
-# Measure test coverage, too
-which -s kcov && \
-	env CARGO_TARGET_DIR=/localhome/somers/src/rust/bfffs/target_cov cargo +nightly kcov --all -v --features mocks -- --include-path="bfffs/src,isa-l/src"
+# Measure test coverage, too.  Only measure test coverage for the main crate,
+# because cargo-kcov doesn't work with workspaces that have features.
+# https://github.com/kennytm/cargo-kcov/issues/39
+if which -s kcov ; then
+	cd bfffs;
+	env CARGO_TARGET_DIR=/localhome/somers/src/rust/bfffs/target_cov cargo +nightly kcov --all -v --features mocks -- --include-path="src"
+fi