change to stable toolchain and remove downloads

Signed-off-by: Prabhat Verma <[email protected]>

Author: Prabhat1308

contrib/generate_fuzz_coverage.sh

@@ -5,30 +5,35 @@ set -x
 # Define the fuzz directory relative to the project root
 FUZZ_DIR="fuzz"
 
-TOOLCHAIN="nightly"
 FEATURES="libfuzzer_fuzz"
 
 # --- Dependencies ---
-echo "Checking/installing dependencies..."
-# cargo-llvm-cov implicitly uses/installs necessary LLVM tools
-rustup +${TOOLCHAIN} component add llvm-tools-preview
-# Check if cargo-llvm-cov is installed, install if not
-if ! cargo +${TOOLCHAIN} --list | grep -q "llvm-cov"; then
-    echo "Installing cargo-llvm-cov..."
-    cargo +${TOOLCHAIN} install cargo-llvm-cov
+echo "Checking dependencies..."
+# Check if llvm-tools is installed for the toolchain
+if ! rustup component list | grep -q "llvm-tools.*(installed)"; then
+    echo "Error: Required component 'llvm-tools' is not installed for the default toolchain."
+    echo "Please install it using: rustup component add llvm-tools"
+    exit 1
+fi
+
+# Check if cargo-llvm-cov is installed
+if ! cargo --list | grep -q "llvm-cov"; then
+    echo "Error: Required cargo subcommand 'llvm-cov' is not installed for the default toolchain."
+    echo "Please install it using: cargo install cargo-llvm-cov"
+    exit 1
 fi
 
 # Clean previous builds and coverage artifacts relative to project root
 echo "Cleaning previous build and coverage artifacts..."
-cargo +${TOOLCHAIN} clean
+cargo clean
 rm -rf target/llvm-cov-target
 rm -rf target/coverage
 
 echo "Running fuzz targets with cargo-llvm-cov to collect coverage..."
 export RUSTFLAGS="--cfg=fuzzing --cfg=secp256k1_fuzz --cfg=hashes_fuzz"
 
 # Determine host triple dynamically for the --target flag
-HOST_TRIPLE=$(rustc +${TOOLCHAIN} --version --verbose | grep host | cut -d' ' -f2)
+HOST_TRIPLE=$(rustc --version --verbose | grep host | cut -d' ' -f2)
 if [ -z "$HOST_TRIPLE" ]; then
     echo "Error: Could not determine host triple."
     exit 1
@@ -45,7 +50,7 @@ for TARGET_PATH in "$FUZZ_DIR"/src/bin/*_target.rs; do
 
     if [ -d "$TARGET_CORPUS_DIR" ]; then
         echo "Running cargo llvm-cov for target: $TARGET_NAME with corpus $TARGET_CORPUS_DIR"
-        if ! CARGO_TARGET_DIR=./target cargo +${TOOLCHAIN} llvm-cov run --no-report --manifest-path "$FUZZ_DIR/Cargo.toml" --target "$HOST_TRIPLE" --features "$COMBINED_FEATURES" --bin "$TARGET_NAME" -- "$TARGET_CORPUS_DIR" -runs=1; then
+        if ! CARGO_TARGET_DIR=./target cargo llvm-cov run --no-report --manifest-path "$FUZZ_DIR/Cargo.toml" --target "$HOST_TRIPLE" --features "$COMBINED_FEATURES" --bin "$TARGET_NAME" -- "$TARGET_CORPUS_DIR" -runs=1; then
              echo "Warning: Execution of $TARGET_NAME with cargo-llvm-cov finished with non-zero status."
         fi
     else