vault backup: 2025-01-30 22:30:06

Author: abhiaagarwal

content/programming/languages/python/sqlalchemy/pydantic.md

@@ -16,8 +16,7 @@ class PydanticModelType[T: BaseModel](TypeDecorator[T]):
     cache_ok = True
     impl = JSON()
 
-    def __init__(self, pydantic_type: type[T]) -> None:
-        self.pydantic_type = pydantic_type
+    def __init__(self) -> None:
         super().__init__()
 
     @override

content/programming/tools/justfile/tagged-docker-images.md

@@ -0,0 +1,52 @@
+---
+title: Using `just` to properly tag docker compose images
+tags:
+  - observations
+---
+You're developing a dockerized application, so you have a docker compose stack.
+
+```yaml
+services:
+    frontend:
+        image: 'frontend:develop'
+        build:
+            context: ./frontend
+    backend:
+        image: 'backend:develop'
+        build:
+            context: ./backend
+```
+
+This is pretty neaat, but it does mean that all your images are built with the tag `develop`. Let's say you switch to another branch, and you want to test the application there. You are _forced_ to rebuild, and then you lose your old image entirely.
+
+A common workaround is to define an environment variable `TAG`, and then rewrite the docker compose to be:
+
+```yaml
+services:
+    frontend:
+        image: 'frontend:${TAG:-develop}$'
+        build:
+            context: ./frontend
+    backend:
+        image: 'backend:${TAG:-develop}$'
+        build:
+            context: ./backend
+```
+
+We can instead do `TAG=my-branch docker compose build` ! Still, not optimal. It involves typing _at least_ 4 extra characters, and if you're anything like me, you're going to do it more often than not. We _could_ export it globally, but I personally tend to avoid setting env variables.
+
+```just
+export TAG=`(git rev-parse --abbrev-ref HEAD`
+
+just up *FLAGS:
+    docker compose up {{FLAGS}}
+```
+
+Pretty cool! But this could create docker tags that aren't syntactically valid, like if the branch is called `my/feature-branch`. Instead, we can normalize it, following exactly what gitlab does to generate [`CI_COMMIT_REF_SLUG`](https://gitlab.com/gitlab-org/gitlab-runner/-/blame/af6932352f8ed15d1a6d9c786399607bc6be2c2d/Makefile.build.mk?page=1#L25).
+
+```just
+export TAG=`(git rev-parse --abbrev-ref HEAD) | tr '[:upper:]' '[:lower:]) | cut -c -63 | sed -E 's/[^a-z0-9-]+/-/g' | sed -E 's/^-*([a-z0-9-]+[a-z0-9])-*$$/\1/g')`
+
+just up *FLAGS:
+    docker compose up {{FLAGS}}
+```