Fix mips build.

As mips is a tier-3 target, it can only be built using the nightly
toolchain. Because of the latest changes, we need to update the
nightly toolchain. However, the latest toolchain does not play nicely
with cargo-cross 0.2.5. This problem has been solved, but not yet
released which is why we install it using dev-dependencies.

Author: brocaar

.github/workflows/main.yml

@@ -67,6 +67,9 @@ jobs:
             ~/.cargo/git/db/
             target/
           key: ${{ runner.os }}-cargo-dist-${{ matrix.target }}-${{ hashFiles('**/Cargo.lock') }}
+      -
+        name: Install dev dependencies
+        run: nix-shell --command "make dev-dependencies"
       -
         name: Build distributables
         run: nix-shell --command "make dist-${{ matrix.target }}"

Makefile

@@ -23,13 +23,13 @@ build-armv7-unknown-linux-musleabihf:
 
 build-mips-unknown-linux-musl:
 	# mips is a tier-3 target.
-	rustup toolchain add nightly-2024-05-17-x86_64-unknown-linux-gnu
-	cross +nightly-2024-05-17 build -Z build-std=panic_abort,std --target mips-unknown-linux-musl --release
+	rustup toolchain add nightly-2025-02-14-x86_64-unknown-linux-gnu
+	cross +nightly-2025-02-14 build -Z build-std=panic_abort,std --target mips-unknown-linux-musl --release
 
 build-mipsel-unknown-linux-musl:
 	# mipsel is a tier-3 target.
-	rustup toolchain add nightly-2024-05-17-x86_64-unknown-linux-gnu
-	cross +nightly-2024-05-17 build -Z build-std=panic_abort,std --target mipsel-unknown-linux-musl --release
+	rustup toolchain add nightly-2025-02-14-x86_64-unknown-linux-gnu
+	cross +nightly-2025-02-14 build -Z build-std=panic_abort,std --target mipsel-unknown-linux-musl --release
 
 # Build distributable binaries for all targets.
 dist: \
@@ -121,3 +121,7 @@ test:
 # Enter the devshell.
 devshell:
 	nix-shell
+
+# Dependencies
+dev-dependencies:
+	cargo install cross --git https://github.com/cross-rs/cross --rev c7dee4d008475ce1c140773cbcd6078f4b86c2aa --locked

shell.nix

@@ -6,9 +6,14 @@ pkgs.mkShell {
     pkgs.protobuf
     pkgs.opkg-utils
     pkgs.jq
-    pkgs.cargo-cross
+    # cargo-cross can be used once version > 0.2.5, as 0.2.5 does not work well
+    # with nightly toolchain. It is for now installed through make dev-dependencies.
+    # pkgs.cargo-cross
     pkgs.cargo-deb
   ];
+  shellHook = ''
+    export PATH=$PATH:~/.cargo/bin
+  '';
   DOCKER_BUILDKIT = "1";
   NIX_STORE = "/nix/store";
 }