DRIVERS-3099 Add option for using existing mongodb binaries dir (#593)

Co-authored-by: Ezra Chung <ezra.chung@mongodb.com>

Author: blink1073

.evergreen/orchestration/drivers_orchestration.py

@@ -98,6 +98,10 @@ def get_options():
     other_group.add_argument(
         "--mongodb-binaries", help="The path to store the MongoDB binaries"
     )
+    other_group.add_argument(
+        "--existing-binaries-dir",
+        help="A directory containing existing mongodb binaries to use instead of downloading new ones.",
+    )
 
     # Get the options, and then allow environment variable overrides.
     opts = parser.parse_args()
@@ -197,9 +201,13 @@ def run(opts):
         default_args += " -v"
     args = f"{default_args} --version {version}"
     args += " --strip-path-components 2 --component archive"
-    LOGGER.info(f"Downloading mongodb {version}...")
-    mongodl(shlex.split(args))
-    LOGGER.info(f"Downloading mongodb {version}... done.")
+    if not opts.existing_binaries_dir:
+        LOGGER.info(f"Downloading mongodb {version}...")
+        mongodl(shlex.split(args))
+        LOGGER.info(f"Downloading mongodb {version}... done.")
+    else:
+        LOGGER.info(f"Using existing mongod binaries dir: {opts.existing_binaries_dir}")
+        shutil.copytree(opts.existing_binaries_dir, mdb_binaries)
 
     # Download legacy shell.
     if opts.install_legacy_shell:

.evergreen/tests/test-cli.sh

@@ -38,6 +38,14 @@ else
   ./mongosh-dl --version 2.1.1 --out ${DOWNLOAD_DIR} --strip-path-components 1
 fi
 
+# Ensure that we can use a downloaded mongodb directory.
+rm -rf ${DOWNLOAD_DIR}
+bash install-cli.sh "$(pwd)/orchestration"
+./mongodl --edition enterprise --version 7.0 --component archive --out ${DOWNLOAD_DIR} --strip-path-components 2
+./orchestration/drivers-orchestration run --existing-binaries-dir=${DOWNLOAD_DIR}
+${DOWNLOAD_DIR}/mongod --version | grep v7.0
+./orchestration/drivers-orchestration stop
+
 if [ ${1:-} == "partial" ]; then
   popd
   make -C ${DRIVERS_TOOLS} test