pull images when not found (closes #25); small fixes

1 files changed, 33 insertions, 0 deletions

diff --git a/utils/docker.go b/utils/docker.go
new file mode 100644
index 0000000..339b0a9
--- /dev/null
+++ b/utils/docker.go
@@ -0,0 +1,33 @@
+package utils
+
+import (
+	"os/exec"
+	"os"
+	"strings"
+)
+
+// RunDockerCmd runs a given Docker command in the current tty
+func RunDockerCmd(cmdStr string, args ...string) error {
+
+	allArgs := cleanArgs(append([]string{cmdStr}, args...))
+
+	cmd := exec.Command("docker", allArgs...)
+
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Stdin = os.Stdin
+
+	return cmd.Run()
+}
+
+// cleanArgs trims the whitespace from the given set of strings.
+func cleanArgs(s []string) []string {
+	var r []string
+	for _, str := range s {
+		if str != "" {
+			r = append(r, strings.Trim(str, " "))
+		}
+	}
+	return r
+}
+