make+scripts: use pre-compiled btcd in itest

To make sure we build the exact version of btcd that is referenced in
the project's go.mod file and to not overwrite any binary the user might
already have installed on the system, we compile btcd into an explicit
file in the itest directory.
This should also speed up invocations of "make itest-only" because the
test harness doesn't always compile btcd on its own.

We also fix a bug with the version parsing where adding a "replace"
directive in the go.mod would result in the awk commands to extract the
wrong version. Because we no longer use the DEPGET goal to build and
install btcd, using a replace directive now actually works for itests.

.gitignore

@@ -36,6 +36,7 @@ lntest/itest/*.log
 lntest/itest/.backendlogs
 lntest/itest/.minerlogs
 lntest/itest/lnd-itest
+lntest/itest/btcd-itest
 lntest/itest/.logs-*
 
 cmd/cmd

Makefile

@@ -20,7 +20,6 @@ GOACC_BIN := $(GO_BIN)/go-acc
 GOFUZZ_BUILD_BIN := $(GO_BIN)/go-fuzz-build
 GOFUZZ_BIN := $(GO_BIN)/go-fuzz
 
-BTCD_DIR :=${GOPATH}/src/$(BTCD_PKG)
 MOBILE_BUILD_DIR :=${GOPATH}/src/$(MOBILE_PKG)/build
 IOS_BUILD_DIR := $(MOBILE_BUILD_DIR)/ios
 IOS_BUILD := $(IOS_BUILD_DIR)/Lndmobile.framework
@@ -32,7 +31,7 @@ COMMIT_HASH := $(shell git rev-parse HEAD)
 
 BTCD_COMMIT := $(shell cat go.mod | \
 		grep $(BTCD_PKG) | \
-		tail -n1 | \
+		head -n1 | \
 		awk -F " " '{ print $$2 }' | \
 		awk -F "/" '{ print $$1 }')
 
@@ -140,9 +139,12 @@ build:
 	$(GOBUILD) -tags="$(DEV_TAGS)" -o lncli-debug $(DEV_LDFLAGS) $(PKG)/cmd/lncli
 
 build-itest:
-	@$(call print, "Building itest lnd and lncli.")
-	$(GOBUILD) -tags="$(ITEST_TAGS)" -o lnd-itest$(EXEC_SUFFIX) $(ITEST_LDFLAGS) $(PKG)/cmd/lnd
-	$(GOBUILD) -tags="$(ITEST_TAGS)" -o lncli-itest$(EXEC_SUFFIX) $(ITEST_LDFLAGS) $(PKG)/cmd/lncli
+	@$(call print, "Building itest btcd and lnd.")
+	CGO_ENABLED=0 $(GOBUILD) -tags="rpctest" -o lntest/itest/btcd-itest$(EXEC_SUFFIX) $(ITEST_LDFLAGS) $(BTCD_PKG)
+	CGO_ENABLED=0 $(GOBUILD) -tags="$(ITEST_TAGS)" -o lntest/itest/lnd-itest$(EXEC_SUFFIX) $(ITEST_LDFLAGS) $(PKG)/cmd/lnd
+
+	@$(call print, "Building itest binary for ${backend} backend.")
+	CGO_ENABLED=0 $(GOTEST) -v ./lntest/itest -tags="$(DEV_TAGS) $(RPC_TAGS) rpctest $(backend)" -c -o lntest/itest/itest.test$(EXEC_SUFFIX)
 
 install:
 	@$(call print, "Installing lnd and lncli.")
@@ -169,18 +171,13 @@ itest-only:
 	EXEC_SUFFIX=$(EXEC_SUFFIX) scripts/itest_part.sh 0 1 $(TEST_FLAGS) $(ITEST_FLAGS)
 	lntest/itest/log_check_errors.sh
 
-itest: btcd build-itest itest-only
-
-itest-parallel: btcd
-	@$(call print, "Building lnd binary")
-	CGO_ENABLED=0 $(GOBUILD) -tags="$(ITEST_TAGS)" -o lntest/itest/lnd-itest$(EXEC_SUFFIX) $(ITEST_LDFLAGS) $(PKG)/cmd/lnd
-
-	@$(call print, "Building itest binary for $(backend) backend")
-	CGO_ENABLED=0 $(GOTEST) -v ./lntest/itest -tags="$(DEV_TAGS) $(RPC_TAGS) rpctest $(backend)" -logoutput -goroutinedump -c -o lntest/itest/itest.test$(EXEC_SUFFIX)
+itest: build-itest itest-only
 
+itest-parallel: build-itest
 	@$(call print, "Running tests")
-	rm -rf lntest/itest/*.log lntest/itest/.logs-*
+	rm -rf lntest/itest/*.log lntest/itest/.logs-*; date
 	EXEC_SUFFIX=$(EXEC_SUFFIX) echo "$$(seq 0 $$(expr $(ITEST_PARALLELISM) - 1))" | xargs -P $(ITEST_PARALLELISM) -n 1 -I {} scripts/itest_part.sh {} $(NUM_ITEST_TRANCHES) $(TEST_FLAGS)
+	lntest/itest/log_check_errors.sh
 
 unit: btcd
 	@$(call print, "Running unit tests.")

scripts/itest_part.sh

@@ -15,9 +15,10 @@ shift
 # that here if necessary.
 EXEC="$WORKDIR"/itest.test"$EXEC_SUFFIX"
 LND_EXEC="$WORKDIR"/lnd-itest"$EXEC_SUFFIX"
-echo $EXEC -test.v "$@" -logoutput -goroutinedump -logdir=.logs-tranche$TRANCHE -lndexec=$LND_EXEC -splittranches=$NUM_TRANCHES -runtranche=$TRANCHE
+BTCD_EXEC="$WORKDIR"/btcd-itest"$EXEC_SUFFIX"
+echo $EXEC -test.v "$@" -logoutput -goroutinedump -logdir=.logs-tranche$TRANCHE -lndexec=$LND_EXEC -btcdexec=$BTCD_EXEC -splittranches=$NUM_TRANCHES -runtranche=$TRANCHE
 
 # Exit code 255 causes the parallel jobs to abort, so if one part fails the
 # other is aborted too.
 cd "$WORKDIR" || exit 255
-$EXEC -test.v "$@" -logoutput -goroutinedump -logdir=.logs-tranche$TRANCHE -lndexec=$LND_EXEC -splittranches=$NUM_TRANCHES -runtranche=$TRANCHE || exit 255
+$EXEC -test.v "$@" -logoutput -goroutinedump -logdir=.logs-tranche$TRANCHE -lndexec=$LND_EXEC -btcdexec=$BTCD_EXEC -splittranches=$NUM_TRANCHES -runtranche=$TRANCHE || exit 255