Migrate datadir and IPC onto dcc-daemon

Makefile

@@ -8,7 +8,7 @@ export RUSTUP_TOOLCHAIN
 # Optional wireless iface for `make dev` (e.g. INTERFACE=wlan0).
 INTERFACE ?=
 
-.PHONY: all build release release-musl check test test-release-assertions clean fmt clippy dev
+.PHONY: all build release release-musl check test test-release-assertions clean fmt clippy dev deps-update
 
 all: build
 
@@ -54,6 +54,10 @@ fmt:
 clippy:
 	$(CARGO) clippy --workspace --all-targets --locked -- -D warnings
 
+# Refresh git crates (bigfred-shared-daemon) and rewrite Cargo.lock. Commit the lockfile afterwards.
+deps-update:
+	$(CARGO) update -p bigfred-shared-daemon
+
 clean:
 	$(CARGO) clean
 	rm -rf dist

crates/wireless-programmer/Cargo.toml

@@ -28,7 +28,8 @@ clap = { version = "4", features = ["derive"] }
 humantime = "2"
 thiserror = "2"
 tokio = { version = "1", features = ["rt-multi-thread", "macros", "net", "signal", "time", "sync", "io-util"] }
-nix = { version = "0.29", features = ["user", "socket", "fs"] }
+nix = { version = "0.29", features = ["user", "fs"] }
+bigfred-shared-daemon = { git = "https://github.com/dcc-bigfred/rust-commons.git", branch = "main", default-features = false, features = ["ipc"] }
 libc = "0.2"
 parking_lot = "0.12"
 tracing = "0.1"

crates/wireless-programmer/src/config.rs

@@ -196,13 +196,12 @@ fn resolve_fake_web_port_env() -> Option<u16> {
 
 /// Resolve the BigFred data directory.
 pub fn resolve_data_dir() -> PathBuf {
-    if let Ok(d) = std::env::var("BIGFRED_DATA_DIR") {
-        return PathBuf::from(d);
-    }
-    if let Ok(d) = std::env::var("DATA_DIR") {
-        return PathBuf::from(d);
-    }
-    PathBuf::from("/data")
+    bigfred_shared_daemon::DataDir::resolve(
+        bigfred_shared_daemon::EnvPolicy::BigfredThenDataDir,
+        bigfred_shared_daemon::PathRule::AcceptAny,
+    )
+    .as_path()
+    .to_path_buf()
 }
 
 #[cfg(test)]