Move cncd/pipeline/pipeline/ to pipeline/ (#347)

* Refactor: move cncd/pipeline/ to pipeline/

* Refactor: move pipeline/pipeline/ to pipeline/

pipeline/frontend/yaml/compiler/script_posix.go

@@ -0,0 +1,56 @@
+package compiler
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"strings"
+)
+
+// generateScriptPosix is a helper function that generates a build script
+// for a linux container using the given
+func generateScriptPosix(commands []string) string {
+	var buf bytes.Buffer
+	for _, command := range commands {
+		escaped := fmt.Sprintf("%q", command)
+		escaped = strings.Replace(escaped, "$", `\$`, -1)
+		buf.WriteString(fmt.Sprintf(
+			traceScript,
+			escaped,
+			command,
+		))
+	}
+	script := fmt.Sprintf(
+		setupScript,
+		buf.String(),
+	)
+	return base64.StdEncoding.EncodeToString([]byte(script))
+}
+
+// setupScript is a helper script this is added to the build to ensure
+// a minimum set of environment variables are set correctly.
+// TODO: Unsetting DRONE_* is present for backward compatibility and should
+// be removed in a future version.
+const setupScript = `
+if [ -n "$CI_NETRC_MACHINE" ]; then
+cat <<EOF > $HOME/.netrc
+machine $CI_NETRC_MACHINE
+login $CI_NETRC_USERNAME
+password $CI_NETRC_PASSWORD
+EOF
+chmod 0600 $HOME/.netrc
+fi
+unset CI_NETRC_USERNAME
+unset CI_NETRC_PASSWORD
+unset CI_SCRIPT
+unset DRONE_NETRC_USERNAME
+unset DRONE_NETRC_PASSWORD
+%s
+`
+
+// traceScript is a helper script that is added to the build script
+// to trace a command.
+const traceScript = `
+echo + %s
+%s
+`