ci: reject unused dependencies

.github/workflows/ci.yml

@@ -50,6 +50,16 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v7
 
+      - name: Cache Cargo downloads
+        uses: actions/cache@v6
+        with:
+          path: |
+            ~/.cargo/registry/cache
+            ~/.cargo/registry/index
+          key: cargo-v1-systest-${{ hashFiles('rust-toolchain.toml') }}
+          restore-keys: |
+            cargo-v1-systest-
+
       - name: Prepare Environment
         run: |
           # Setup Rust and toolchains
@@ -97,6 +107,15 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v7
+      - name: Cache Cargo downloads
+        uses: actions/cache@v6
+        with:
+          path: |
+            /opt/teaclave/cargo/registry/cache
+            /opt/teaclave/cargo/registry/index
+          key: cargo-v1-dev-docker-${{ matrix.std }}-${{ hashFiles('rust-toolchain.toml') }}
+          restore-keys: |
+            cargo-v1-dev-docker-${{ matrix.std }}-
       - name: Setup environment
         run: /entrypoint.sh true
       - name: Build examples
@@ -115,6 +134,23 @@ jobs:
           fi
 
 
+  unused-dependencies:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v7
+      - name: Install cargo-machete
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-machete@0.9.2
+      - name: Check for unused dependencies
+        run: |
+          for dir in crates examples/ta examples/ca tools projects/web3/eth_wallet; do
+            echo "::group::cargo machete ($dir)"
+            (cd "$dir" && cargo machete)
+            echo "::endgroup::"
+          done
+
   license:
     runs-on: ubuntu-latest
     steps:

.github/workflows/reuse_host_build_and_qemu_run.yml

@@ -51,6 +51,15 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v7
+      - name: Cache Cargo downloads
+        uses: actions/cache@v6
+        with:
+          path: |
+            ~/.cargo/registry/cache
+            ~/.cargo/registry/index
+          key: cargo-v1-examples-${{ inputs.std }}-${{ hashFiles('rust-toolchain.toml') }}
+          restore-keys: |
+            cargo-v1-examples-${{ inputs.std }}-
       # Setup Rust and toolchains
       - name: Setup
         run: |

.github/workflows/reuse_test.yml

@@ -39,6 +39,15 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v7
+      - name: Cache Cargo downloads
+        uses: actions/cache@v6
+        with:
+          path: |
+            ~/.cargo/registry/cache
+            ~/.cargo/registry/index
+          key: cargo-v1-build-utee-teec-${{ hashFiles('rust-toolchain.toml') }}
+          restore-keys: |
+            cargo-v1-build-utee-teec-
       - name: Building
         run: |
           # Setup Rust and toolchains

examples/ca/Cargo.toml

@@ -23,14 +23,12 @@ members = ["*-rs", "*-rs-plugin"]
 proto = { path = "../ta/proto" }
 optee-teec = { path = "../../crates/optee-teec" }
 optee-teec-build = { path = "../../crates/optee-teec-build" }
-libc = "0.2.191"
 r2d2 = "0.8.10"
 clap = "4.6.7"
 anyhow = "1.0.104"
 hex = "0.4.3"
 mobc = "0.9.0"
 tokio = "1.54.1"
-strum = "0.28.0"
 url = "2.5.8"
 serde_json = "1.0.154"
 rand = "0.10.3"
@@ -40,7 +38,6 @@ image = "0.25.10"
 tiny_http = "0.12.0"
 ureq = "3.5.0"
 flate2 = "1.1.10"
-uuid = "1.29.0"
 
 [profile.release]
 lto = true

examples/ca/acipher-rs/Cargo.toml

@@ -25,6 +25,5 @@ description = "An example of Rust OP-TEE TrustZone SDK."
 edition = "2018"
 
 [dependencies]
-libc = { workspace = true }
 proto = { workspace = true }
 optee-teec = { workspace = true }

examples/ca/aes-rs/Cargo.toml

@@ -25,6 +25,5 @@ description = "An example of Rust OP-TEE TrustZone SDK."
 edition = "2018"
 
 [dependencies]
-libc = { workspace = true }
 proto = { workspace = true }
 optee-teec = { workspace = true }

examples/ca/authentication-rs/Cargo.toml

@@ -25,6 +25,5 @@ description = "An example of Rust OP-TEE TrustZone SDK."
 edition = "2018"
 
 [dependencies]
-libc = { workspace = true }
 proto = { workspace = true }
 optee-teec = { workspace = true }

examples/ca/big_int-rs/Cargo.toml

@@ -25,6 +25,5 @@ description = "An example of Rust OP-TEE TrustZone SDK."
 edition = "2018"
 
 [dependencies]
-libc = { workspace = true }
 proto = { workspace = true }
 optee-teec = { workspace = true }

examples/ca/client_pool-rs/Cargo.toml

@@ -33,4 +33,3 @@ anyhow = { workspace = true }
 hex = { workspace = true }
 mobc = { workspace = true }
 tokio = { workspace = true, features = ["rt-multi-thread", "sync"] }
-strum = { workspace = true, features = ["derive"] }

examples/ca/diffie_hellman-rs/Cargo.toml

@@ -25,6 +25,5 @@ description = "An example of Rust OP-TEE TrustZone SDK."
 edition = "2018"
 
 [dependencies]
-libc = { workspace = true }
 proto = { workspace = true }
 optee-teec = { workspace = true }

examples/ca/digest-rs/Cargo.toml

@@ -25,6 +25,5 @@ description = "An example of Rust OP-TEE TrustZone SDK."
 edition = "2018"
 
 [dependencies]
-libc = { workspace = true }
 proto = { workspace = true }
 optee-teec = { workspace = true }