Renaming use_cache to pull_image

.gitignore

@@ -26,6 +26,3 @@ _testmain.go
 
 coverage.out
 drone-docker
-
-# IDE/Editor related files
-**.swp

main.go

@@ -119,9 +119,9 @@ func main() {
 			EnvVar: "PLUGIN_SQUASH",
 		},
 		cli.BoolTFlag{
-			Name:   "cache",
-			Usage:  "don't attempt to re-build layers of the image that already exist",
-			EnvVar: "PLUGIN_USE_CACHE",
+			Name:   "pull-image",
+			Usage:  "force pull base image at build time",
+			EnvVar: "PLUGIN_PULL_IMAGE",
 		},
 		cli.BoolFlag{
 			Name:   "compress",
@@ -177,7 +177,7 @@ func run(c *cli.Context) error {
 			Tags:       c.StringSlice("tags"),
 			Args:       c.StringSlice("args"),
 			Squash:     c.Bool("squash"),
-			Cache:       c.Bool("cache"),
+			Pull:       c.BoolT("pull-image"),
 			Compress:   c.Bool("compress"),
 			Repo:       c.String("repo"),
 		},

plugin.go

@@ -47,7 +47,7 @@ type (
 		Tags       []string // Docker build tags
 		Args       []string // Docker build args
 		Squash     bool     // Docker build squash
-		Cache      bool     // Docker build without pulling
+		Pull       bool     // Docker build pull
 		Compress   bool     // Docker build compress
 		Repo       string   // Docker build repository
 	}
@@ -186,7 +186,7 @@ func commandInfo() *exec.Cmd {
 
 // helper function to create the docker build command.
 func commandBuild(build Build) *exec.Cmd {
-	args := []string {
+	args := []string{
 		"build",
 		"--rm=true",
 		"-f", build.Dockerfile,
@@ -200,11 +200,9 @@ func commandBuild(build Build) *exec.Cmd {
 	if build.Compress {
 		args = append(args, "--compress")
 	}
-    if build.Cache {
-        args = append(args, "--pull=false")
-    } else {
-        args = append(args, "--pull=true")
-    }
+	if build.Pull {
+		args = append(args, "--pull=true")
+	}
 	for _, arg := range build.Args {
 		args = append(args, "--build-arg", arg)
 	}