Embed migrations from the single root directory

Makefile

@@ -8,10 +8,8 @@ endif
 # PostgreSQL connection URL for diesel CLI.
 POSTGRES_URL ?= postgresql://postgres:postgres@localhost:5432/postgres
 
-# Migration directories and files.
+# Generated database schema file (produced by `diesel print-schema`).
 SCHEMA_OUTPUT = ./crates/nvisy-postgres/src/schema.rs
-MIGRATIONS_IN_DIR = ./migrations
-MIGRATIONS_OUT_DIR = ./crates/nvisy-postgres/src/migrations
 
 # Auth secret keys.
 PRIVATE_KEY_FILE = private.pem
@@ -68,17 +66,9 @@ generate-keys: ## Generates auth key pair and encryption key.
 
 .PHONY: generate-migrations
 generate-migrations: ## Regenerates the Postgres migrations and database schema.
-	@$(call log,Deleting embedded migrations directory...)
-	@rm -rf $(MIGRATIONS_OUT_DIR)
-	@$(call log,Embedded migrations directory deleted.)
 	@$(call log,Deleting a generated database schema file...)
 	@rm -f $(SCHEMA_OUTPUT)
 	@$(call log,Database schema file deleted.)
-	@$(call log,Ensuring migrations directory exists...)
-	@mkdir -p $(MIGRATIONS_OUT_DIR)
-	@$(call log,Copying migrations to $(MIGRATIONS_OUT_DIR)...)
-	@cp -r $(MIGRATIONS_IN_DIR)/* $(MIGRATIONS_OUT_DIR)
-	@$(call log,Migrations copied successfully.)
 	@$(call log,Running migrations...)
 	@DATABASE_URL=$(POSTGRES_URL) diesel migration run
 	@$(call log,Migrations applied successfully.)
@@ -88,9 +78,6 @@ generate-migrations: ## Regenerates the Postgres migrations and database schema.
 
 .PHONY: clear-migrations
 clear-migrations: ## Reverts all database migrations.
-	@$(call log,Deleting copied migrations...)
-	@rm -rf $(MIGRATIONS_OUT_DIR)
-	@$(call log,Copied migrations deleted.)
 	@$(call log,Reverting all migrations...)
 	@while DATABASE_URL=$(POSTGRES_URL) diesel migration list | grep -q "\\[X\\]"; do \
 		$(call log,Reverting migration...); \

crates/nvisy-postgres/build.rs

@@ -10,5 +10,5 @@
 /// To work around this limitation, you can add a custom `build.rs` file to your crate.
 /// This ensures the crate is rebuilt whenever the migration directory changes.
 fn main() {
-    println!("cargo:rerun-if-changed=./src/migrations");
+    println!("cargo:rerun-if-changed=../../migrations");
 }

crates/nvisy-postgres/src/lib.rs

@@ -3,8 +3,12 @@
 #![doc = include_str!("../README.md")]
 
 /// Embeds all migrations into the final binary.
+///
+/// Points at the single canonical `migrations/` directory at the repository root
+/// (resolved from this crate's manifest directory), so there is one source of
+/// truth for migrations rather than a copy kept in sync inside the crate.
 pub(crate) const MIGRATIONS: diesel_migrations::EmbeddedMigrations =
-    diesel_migrations::embed_migrations!();
+    diesel_migrations::embed_migrations!("../../migrations");
 
 /// Tracing target for database query operations.
 ///

diesel.toml

@@ -6,7 +6,6 @@ import_types = ["diesel::sql_types::*"]
 custom_type_derives = ["diesel::query_builder::QueryId"]
 
 [migrations_directory]
-# The "./migrations" directory is copied from the root directory into
-# the "./crates/nvisy-postgres/migrations" directory when running
-# the task "make generate-migrations".
+# The single source of truth for migrations. `embed_migrations!` in
+# nvisy-postgres reads this same directory (via "../../migrations").
 dir = "./migrations"