[gentoo-dev] [PATCH 2/2] eclass/cargo.eclass: require cargo_gen_config in cargo_src* functions

[Georgy Yakovlev]

cargo_gen_config sets required config values and env vars, which
cargo_src_{compile,test,install} rely on.

it should be called as last step of src_unpack normally, so check it did.
Crate sources may have been vendored or cargo is wrapped by other build
system and pre-fetched, so cargo_*unpack may be not used.

In that case we can't guarantee our config will work, so src_ functions
should not be used.

Signed-off-by: Georgy Yakovlev <gyakovlev@g.o>
---
 eclass/cargo.eclass | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/eclass/cargo.eclass b/eclass/cargo.eclass
index dde601ec4e3c..3e08888bb443 100644
--- a/eclass/cargo.eclass
+++ b/eclass/cargo.eclass
@@ -267,6 +267,7 @@ cargo_gen_config() {
 	_EOF_
 
 	export CARGO_HOME="${ECARGO_HOME}"
+	_CARGO_GEN_CONFIG_HAS_RUN=1
 }
 
 # @FUNCTION: cargo_src_configure
@@ -323,6 +324,9 @@ cargo_src_configure() {
 cargo_src_compile() {
 	debug-print-function ${FUNCNAME} "$@"
 
+	[[ ${_CARGO_GEN_CONFIG_HAS_RUN} ]] || \
+		die "FATAL: please call cargo_gen_config before using ${FUNCNAME}"
+
 	tc-export AR CC CXX
 
 	set -- cargo build $(usex debug "" --release) ${ECARGO_ARGS[@]} "$@"
@@ -340,6 +344,9 @@ cargo_src_compile() {
 cargo_src_install() {
 	debug-print-function ${FUNCNAME} "$@"
 
+	[[ ${_CARGO_GEN_CONFIG_HAS_RUN} ]] || \
+		die "FATAL: please call cargo_gen_config before using ${FUNCNAME}"
+
 	set -- cargo install $(has --path ${@} || echo --path ./) \
 		--root "${ED}/usr" \
 		$(usex debug --debug "") \
@@ -359,6 +366,9 @@ cargo_src_install() {
 cargo_src_test() {
 	debug-print-function ${FUNCNAME} "$@"
 
+	[[ ${_CARGO_GEN_CONFIG_HAS_RUN} ]] || \
+		die "FATAL: please call cargo_gen_config before using ${FUNCNAME}"	
+
 	set -- cargo test $(usex debug "" --release) ${ECARGO_ARGS[@]} "$@"
 	einfo "${@}"
 	"${@}" || die "cargo test failed"
-- 
2.28.0