Version bumping script enhancements

Add the ability to switch the namespace and override versions to bump
with using environment variables.

helpers/bumper.py

@@ -1,4 +1,16 @@
 #!/usr/bin/env python2
+
+#
+# Usage:
+#   ./bumper.py
+#
+# Configurable environment variables:
+# - BUMPER_VERSION_6 overrides the 6.x.x version.
+# - BUMPER_VERSION_7 overrides the 7.x.x version.
+# - BUMPER_USE_STAGING_IMAGES set to "true" causes the
+#   docker.elastic.co/staging/ docker registry namespace to be used.
+#
+
 import re
 import os
 import glob
@@ -7,13 +19,13 @@
 
 os.chdir(os.path.join(os.path.dirname(__file__), ".."))
 
-chart_version = "7.6.1"
-
 versions = {
-    6: "6.8.7",
-    7: "7.6.1",
+    6: os.environ.get("BUMPER_VERSION_6", "6.8.7"),
+    7: os.environ.get("BUMPER_VERSION_7", "7.6.1"),
 }
 
+chart_version = versions[7]
+
 file_patterns = [
     "*/examples/*/test/goss*.y*ml",
     "*/examples/*/*.y*ml",
@@ -40,3 +52,22 @@
                         print(r.sub(chart_version, line.rstrip()))
                     else:
                         print(r.sub(version, line.rstrip()))
+
+if os.environ.get("BUMPER_USE_STAGING_IMAGES") == "true":
+    image_file_patterns = file_patterns + [
+        "*/tests/*.py",
+        "**/templates/*.tpl",
+        "**/Makefile",
+    ]
+
+    for pattern in image_file_patterns:
+        for f in glob.glob(pattern):
+            print(f)
+            for line in fileinput.input([f], inplace=True):
+                print(
+                    re.sub(
+                        r"docker.elastic.co/.+/",
+                        "docker.elastic.co/staging/",
+                        line.rstrip(),
+                    )
+                )