update diff-check logging

These changes mostly improve logging out the cargo version and version
of the two rustfmt binaries that are compiled. Some other minor logging
changes were made as well to add some whitespace to improve visual
clarity when looking at the logs in the GitHub Actions console.

Author: ytmimi

ci/check_diff.sh

@@ -123,15 +123,28 @@ function compile_rustfmt() {
     git remote add feature $REMOTE_REPO
     git fetch feature $FEATURE_BRANCH
 
+    CARGO_VERSON=$(cargo --version)
+    echo -e "\ncompiling with $CARGO_VERSON\n"
+
+    echo "Building rustfmt from src"
     cargo build -q --release --bin rustfmt && cp target/release/rustfmt $1/rustfmt
+
     if [ -z "$OPTIONAL_COMMIT_HASH" ] || [ "$FEATURE_BRANCH" = "$OPTIONAL_COMMIT_HASH" ]; then
         git switch $FEATURE_BRANCH
     else
         git switch $OPTIONAL_COMMIT_HASH --detach
     fi
+
+    echo "Building feature rustfmt from src"
     cargo build -q --release --bin rustfmt && cp target/release/rustfmt $1/feature_rustfmt
+
     RUSFMT_BIN=$1/rustfmt
+    RUSTFMT_VERSION=$($RUSFMT_BIN --version)
+    echo -e "\nRUSFMT_BIN $RUSTFMT_VERSION\n"
+
     FEATURE_BIN=$1/feature_rustfmt
+    FEATURE_VERSION=$($FEATURE_BIN --version)
+    echo -e "FEATURE_BIN $FEATURE_VERSION\n"
 }
 
 # Check the diff for running rustfmt and the feature branch on all the .rs files in the repo.
@@ -164,7 +177,7 @@ function check_repo() {
     STATUSES+=($?)
     set -e
 
-    echo "removing tmp_dir $tmp_dir"
+    echo -e "removing tmp_dir $tmp_dir\n\n"
     rm -rf $tmp_dir
     cd $WORKDIR
 }