Fix #897 and shuffle directory around (#1054)

* Fix #897 and shuffle directory around

* Update find-lint

* goimports

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

build/scripts/find-lint.sh

@@ -0,0 +1,43 @@
+#! /bin/bash
+
+# Runs the linters against dendrite
+
+# The linters can take a lot of resources and are slow, so they can be
+# configured using the following environment variables:
+#
+# - `DENDRITE_LINT_CONCURRENCY` - number of concurrent linters to run,
+#   golangci-lint defaults this to NumCPU
+# - `GOGC` - how often to perform garbage collection during golangci-lint runs.
+#   Essentially a ratio of memory/speed. See https://github.com/golangci/golangci-lint#memory-usage-of-golangci-lint
+#   for more info.
+
+
+set -eux
+
+cd `dirname $0`/../..
+
+args=""
+if [ ${1:-""} = "fast" ]
+then args="--fast"
+fi
+
+echo "Installing golangci-lint..."
+
+# Make a backup of go.{mod,sum} first
+# TODO: Once go 1.13 is out, use go get's -mod=readonly option
+# https://github.com/golang/go/issues/30667
+cp go.mod go.mod.bak && cp go.sum go.sum.bak
+go get github.com/golangci/golangci-lint/cmd/golangci-lint@v1.19.1
+
+# Run linting
+echo "Looking for lint..."
+
+# Capture exit code to ensure go.{mod,sum} is restored before exiting
+exit_code=0
+
+golangci-lint run $args || exit_code=1
+
+# Restore go.{mod,sum}
+mv go.mod.bak go.mod && mv go.sum.bak go.sum
+
+exit $exit_code