devcam: run git pre-commit hook as a test.

Additional check to prevent b bad imports and un-go-fmt'd code
from sneaking in.
If users don't run tests, it will break the builder.

Change-Id: I95c74724aac68d915aa5195b6d8fcb78f92349e0

dev/devcam/test.go

@@ -31,9 +31,10 @@ import (
 
 type testCmd struct {
 	// start of flag vars
-	verbose bool
-	short   bool
-	run     string
+	verbose   bool
+	precommit bool
+	short     bool
+	run       string
 	// end of flag vars
 
 	// buildGoPath becomes our child "go" processes' GOPATH environment variable
@@ -44,6 +45,7 @@ func init() {
 	cmdmain.RegisterCommand("test", func(flags *flag.FlagSet) cmdmain.CommandRunner {
 		cmd := new(testCmd)
 		flags.BoolVar(&cmd.short, "short", false, "Use '-short' with go test.")
+		flags.BoolVar(&cmd.precommit, "precommit", true, "Run misc/pre-commit.githook as part of tests.")
 		flags.BoolVar(&cmd.verbose, "v", false, "Use '-v' (for verbose) with go test.")
 		flags.StringVar(&cmd.run, "run", "", "Use '-run' with go test.")
 		return cmd
@@ -59,6 +61,11 @@ func (c *testCmd) Describe() string {
 }
 
 func (c *testCmd) RunCommand(args []string) error {
+	if c.precommit {
+		if err := c.runPrecommitHook(); err != nil {
+			return err
+		}
+	}
 	if err := c.syncSrc(); err != nil {
 		return err
 	}
@@ -148,3 +155,12 @@ func (c *testCmd) runTests(args []string) error {
 	env.Set("SKIP_DEP_TESTS", "1")
 	return runExec("go", targs, env)
 }
+
+func (c *testCmd) runPrecommitHook() error {
+	out, err := exec.Command("./misc/pre-commit.githook", "test").CombinedOutput()
+	if err != nil {
+		fmt.Println(string(out))
+	}
+	return err
+
+}

misc/pre-commit.githook

@@ -1,5 +1,6 @@
 #!/usr/bin/env sh
 
+mode=${1:-"precommit"}
 exitstatus=0
 
 #third_party imports.
@@ -13,7 +14,7 @@ then
 	do
 		echo $r
 	done
-	echo "The above need their imports to be fixed. Use rewrite-imports.sh -w"
+	echo "The above need their imports to be fixed. Use third_party/rewrite-imports.sh -w"
 fi
 
 #gofmt and trailing space errors
@@ -52,7 +53,9 @@ then
 	then
 		echo "gofmt -w $needFmt"
 	fi
-	echo "You can override this check with 'git commit --no-verify'"
+	if [ "$mode" != "test" ]; then
+		echo "You can override this check with 'git commit --no-verify'"
+	fi
 fi
 
 exit $exitstatus