Regres: Restructure directories for main packages

A directory should only contain either library code, or contain a single `main`.

Attempting to have two main packages upsets the go tools.

Add a `run.sh` bash script in the root regres folder to `go run` the `cmd/regres/main.go` file, to keep usage simple for non-go people.

Change-Id: Ia37ce9a64e1e1a7e23ee3336e6e312cef9e63a9f
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/40528
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>

tests/regres/cmd/export_to_sheets/main.go

diff --git a/tests/regres/export_to_sheets.go b/tests/regres/cmd/export_to_sheets/main.go
similarity index 98%
rename from tests/regres/export_to_sheets.go
rename to tests/regres/cmd/export_to_sheets/main.go
index e982a5c..139dc4b 100644
--- a/tests/regres/export_to_sheets.go
+++ b/tests/regres/cmd/export_to_sheets/main.go
@@ -30,10 +30,10 @@
 	"path/filepath"
 	"strings"
 
-	"./cause"
-	"./consts"
-	"./git"
-	"./testlist"
+	"../../cause"
+	"../../consts"
+	"../../git"
+	"../../testlist"
 
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/google"

tests/regres/cmd/regres/main.go

diff --git a/tests/regres/main.go b/tests/regres/cmd/regres/main.go
similarity index 99%
rename from tests/regres/main.go
rename to tests/regres/cmd/regres/main.go
index 359550f..9ab0735 100644
--- a/tests/regres/main.go
+++ b/tests/regres/cmd/regres/main.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Regres is a tool that detects test regressions with SwiftShader changes.
+// regres is a tool that detects test regressions with SwiftShader changes.
 //
 // Regres monitors changes that have been put up for review with Gerrit.
 // Once a new patchset has been found, regres will checkout, build and test the
@@ -44,13 +44,13 @@
 	"strings"
 	"time"
 
-	"./cause"
-	"./consts"
-	"./deqp"
-	"./git"
-	"./shell"
-	"./testlist"
-	"./util"
+	"../../cause"
+	"../../consts"
+	"../../deqp"
+	"../../git"
+	"../../shell"
+	"../../testlist"
+	"../../util"
 	gerrit "github.com/andygrunwald/go-gerrit"
 )
 

tests/regres/run.sh

diff --git a/tests/regres/run.sh b/tests/regres/run.sh
new file mode 100755
index 0000000..7dd18f4
--- /dev/null
+++ b/tests/regres/run.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+ROOT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd )"
+
+go run $ROOT_DIR/cmd/regres/main.go $@