Add an arg to run task on single crate

Author: nyonson

ci/run_task.sh

@@ -30,7 +30,7 @@ usage() {
     cat <<EOF
 Usage:
 
-    ./run_task.sh TASK
+    ./run_task.sh TASK [CRATE]
 
 TASK
   - stable          Run tests with stable toolchain.
@@ -41,6 +41,10 @@ TASK
   - docsrs          Build docs with nightly toolchain.
   - bench           Run the bench tests.
 
+CRATE (optional)
+  - If provided, run the task only on the specified crate.
+  - If not provided, run the task on all crates from contrib/crates.sh.
+
 Environment Variables:
   MAINTAINER_TOOLS_LOG_LEVEL    Control script and cargo output verbosity.
     verbose (default)           Show all script and cargo messages.
@@ -50,6 +54,7 @@ EOF
 
 main() {
     local task="${1:-usage}"
+    local single_crate="${2:-}"
     local crates_script="$REPO_DIR/contrib/crates.sh"
 
     # FIXME: This is a hackish way to get the help flag.
@@ -70,9 +75,13 @@ main() {
     fi
 
     verbose_say "Repository: $REPO_DIR"
-    verbose_say "Script invocation: $0 $task"
+    verbose_say "Script invocation: $0 $task $single_crate"
 
-    if [ -e "$crates_script" ]; then
+    # Override crates.sh if there is a crate arg.
+    if [ -n "$single_crate" ]; then
+        verbose_say "Using single crate: $single_crate"
+        CRATES="$single_crate"
+    elif [ -e "$crates_script" ]; then
         verbose_say "Sourcing $crates_script"
         # can't find the file because of the ENV var
         # shellcheck source=/dev/null