cargo/hooks: allow hooks to be disabled

pkgs/build-support/rust/hooks/cargo-build-hook.sh

@@ -36,4 +36,6 @@ cargoBuildHook() {
     echo "Finished cargoBuildHook"
 }
 
-buildPhase=cargoBuildHook
+if [ -z "${dontCargoBuild-}" ] && [ -z "${buildPhase-}" ]; then
+  buildPhase=cargoBuildHook
+fi

pkgs/build-support/rust/hooks/cargo-check-hook.sh

@@ -41,6 +41,6 @@ cargoCheckHook() {
     runHook postCheck
 }
 
-if [ -z "${checkPhase-}" ]; then
+if [ -z "${dontCargoCheck-}" ] && [ -z "${checkPhase-}" ]; then
   checkPhase=cargoCheckHook
 fi

pkgs/build-support/rust/hooks/cargo-install-hook.sh

@@ -43,7 +43,7 @@ cargoInstallHook() {
 }
 
 
-if [ -z "${installPhase-}" ]; then
+if [ -z "${dontCargoInstall-}" ] && [ -z "${installPhase-}" ]; then
   installPhase=cargoInstallHook
   postBuildHooks+=(cargoInstallPostBuildHook)
 fi

pkgs/build-support/rust/hooks/cargo-setup-hook.sh

@@ -77,7 +77,9 @@ cargoSetupPostPatchHook() {
     echo "Finished cargoSetupPostPatchHook"
 }
 
-postUnpackHooks+=(cargoSetupPostUnpackHook)
+if [ -z "${dontCargoSetupPostUnpack-}" ]; then
+  postUnpackHooks+=(cargoSetupPostUnpackHook)
+fi
 
 if [ -z ${cargoVendorDir-} ]; then
   postPatchHooks+=(cargoSetupPostPatchHook)