Add check-vendor target to Makefile

The check-vendor target will exit with an error if any files in vendor/
differ from what's checked into git.

govendor checksums can get out of sync if extraneous files are in the
local, third-party repo (see kardianos/govendor#129).  govendor also
updates the vendor.json upon "sync."  We can use that quirk to detect
out of sync checksums in CI, so I've added check-vendor to the check
target dependencies.

diff --git a/Makefile b/Makefile
index a361ca828b2bf2441b852cc35c6bcf5e35540c77..9769e28a2c05feeb65a20b1c90f8c78847de2a0e 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -38,7 +38,7 @@ gitinfo: hugo # Deprecated: use "hugo" target
 install-gitinfo: install # Deprecated: use "install" target
 no-git-info: hugo-no-gitinfo # Deprecated: use "hugo-no-gitinfo" target
 
-check: test-race test386 fmt vet ## Run tests and linters
+check: test-race test386 fmt vet check-vendor ## Run tests and linters
 
 test386: ## Run tests in 32-bit mode
        GOARCH=386 govendor test +local
@@ -76,5 +76,8 @@ test-cover-html: ## Generate test coverage report
                tail -n +2 coverage.out >> coverage-all.out;)
        go tool cover -html=coverage-all.out
 
+check-vendor: ## Verify that vendored packages match git HEAD
+       @git diff-index --quiet HEAD || echo "check-vendor target failed: vendored packages out of sync" && echo && git diff vendor/ && exit 1
+
 help:
        @grep -E '^[a-zA-Z0-9_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'