Add (optional) automatic docker pruning after update

README.md

@@ -19,5 +19,6 @@ Additional options are available:
 
 - `trueupdate -h` for the CLI help page
 - `trueupdate -s` or ` trueupdate --sync` to sync the catalogs before running auto-update
+- `trueupdate -p` or ` trueupdate --prune` to prune (remove) old docker images after running auto-update
 - `trueupdate --catalog CATALOGNAME` where CATALOGNAME is the name of the catalog you want to process in caps
 - `trueupdate --versioning SCHEME` where SCHEME is the highest semver version you want to process. options: `patch`, `minor` and `major`

setup.py

@@ -7,7 +7,7 @@ README_MD = open(join(dirname(abspath(__file__)), "README.md")).read()
 
 setup(
     name="trueupdate",
-    version="2.0.2",
+    version="2.1.0",
 
     # The packages that constitute your project.
     # For my project, I have only one - "pydash".

trueupdate/__init__.py

@@ -81,10 +81,12 @@ def process_args():
     global CATALOG
     global SEMVER
     global SYNC
+    global PRUNE
     parser = argparse.ArgumentParser(description='Update TrueNAS SCALE Apps')
     parser.add_argument('--catalog', nargs='?', default='ALL', help='name of the catalog you want to process in caps. Or "ALL" to render all catalogs.')
     parser.add_argument('--versioning', nargs='?', default='minor', help='Name of the versioning scheme you want to update. Options: major, minor or patch. Defaults to minor')
     parser.add_argument('-s', '--sync', action="store_true", help='sync catalogs before trying to update')
+    parser.add_argument('-p', '--prune', action="store_true", help='prune old docker images after update')
     args = parser.parse_args()
     CATALOG = args.catalog
     VERSIONING = args.versioning
@@ -92,6 +94,10 @@ def process_args():
       SYNC = True
     else:
       SYNC = False
+    if args.prune:
+      PRUNE = True
+    else:
+      PRUNE = False
     
 def sync_catalog():
     if SYNC:
@@ -102,6 +108,15 @@ def sync_catalog():
           print (lines)
       print (process.stdout.read())
   
+def docker_prune():
+    if PRUNE:
+      print("Pruning old docker images...\n")
+      process = subprocess.Popen(["docker", "image ", "prune", "-a", "-f"], stdout=subprocess.PIPE)
+      while process.poll() is None:
+          lines = process.stdout.readline()
+          print (lines)
+      print (process.stdout.read())
+  
 def run():
     process_args()
     print("Starting TrueCharts App updater...\n")