improve readme, add gitignore

.gitignore

@@ -0,0 +1 @@
+__pycache__/

docker-compose.yml

@@ -4,6 +4,6 @@ services:
   image: docker.clkl.de/docker/update:0.1_alpine
   build: .
   volumes:
-   - ./docker-compose.py:/docker-compose.py
-   - ./sample:/services
-  command: bash -c 'python3 /docker_compose.py /services/*'
+   - /opt/docker/services:/services
+   - ./:/out/
+  command: bash -c 'python3 /out/show_updateable.py -s -o /out/updates.json /services/* --ignore zammad'

readme.md

@@ -0,0 +1,86 @@
+Docker Update
+=============
+
+Try to show updates for your used docker images.
+
+
+Requirements
+------------
+
+* Docker
+* docker-compose
+* Libraries: requirements.txt (`pip3 install -r requirements.txt` or docker ;))
+
+You need a directory containing your service directories. These services must have a docker-compose.yml to get checked.
+
+Example:
+```
+└── services
+    ├── bitpoll.wiai.de
+    │   ├── docker
+    │   ├── docker-compose.yml
+    ├── dockerui
+    │   ├── docker-compose.yml
+    └── zitate
+        └── docker-compose.yml
+```
+
+If there are files or directories without a docker-compse.yml, it will just notify you and ignore it. 
+
+If the compose file contains a build-section, the Dockerfile is inspected, too.
+
+Usage
+----
+
+### Docker
+
+Modify mount of services directory. Mount your directory as `/services`.
+
+```
+docker-compose up
+```
+
+Output file: `updates.json`
+
+### Command line
+
+```
+$ python3 show_updateable.py -h
+usage: show_updateable.py [-h] [--output OUTPUT]
+                          [--ignore IGNORE [IGNORE ...]] [--match-suffix]
+                          compose_files [compose_files ...]
+```
+
+* output: json file for results
+* ignore: ignore services (ignore is substring of service path)
+* match-suffix: use only same suffixes in image labels (e.g. only -alpine images)
+* compose files: service directories: see #example (multiple paths allowed)
+
+Advantages
+----------
+
+* No access to Docker-Socket
+* No deamon
+* No state
+* Detect new major versions
+* Report only, no uncontrolled automated actions
+* tbc ...
+
+
+Alternatives
+------------
+
+* https://github.com/v2tec/watchtower (seems quite dead, look for forks)
+* https://github.com/pyouroboros/ouroboros
+* https://engineering.salesforce.com/open-sourcing-dockerfile-image-update-6400121c1a
+* https://stackoverflow.com/questions/26423515/how-to-automatically-update-your-docker-containers-if-base-images-are-updated
+* tbc ...
+
+
+Known Issues
+------------
+
+* Still WiP/PoC
+* http/https sources are not implemented yet
+* some images have … weird tags
+* pull requests welcome

show_updateable.py

@@ -52,5 +52,5 @@ def main(args):
 if __name__=="__main__":
 	parser = docker_compose.args_setup("Show updates for docker-compose style services")
 	args = parser.parse_args()
+	print(args)
 	main(args)
-