Download mongocryptd and crypt_shared for serverless tests

Author: alcaeus

.evergreen/config.yml

@@ -212,6 +212,55 @@ functions:
     - command: expansions.update
       params:
         file: src/serverless-expansion.yml
+    - command: shell.exec
+      params:
+        shell: "bash"
+        script: |
+          ${PREPARE_SHELL}
+          
+          if [ -z "${SERVERLESS_MONGODB_VERSION}" ]; then
+            echo "expected SERVERLESS_MONGODB_VERSION to be set"
+            exit 1
+          fi
+          
+          # Download the enterprise server download for current platform to $MONGODB_BINARIES.
+          # This is required for tests that need mongocryptd.
+          # $MONGODB_BINARIES is added to the $PATH in fetch-source.
+          ${PYTHON3_BINARY} $DRIVERS_TOOLS/.evergreen/mongodl.py \
+              --component archive \
+              --version ${SERVERLESS_MONGODB_VERSION} \
+              --edition enterprise \
+              --out $MONGODB_BINARIES \
+              --strip-path-components 2
+          
+          # Download the crypt_shared dynamic library for the current platform.
+          ${PYTHON3_BINARY} $DRIVERS_TOOLS/.evergreen/mongodl.py \
+            --component crypt_shared \
+            --version ${SERVERLESS_MONGODB_VERSION} \
+            --edition enterprise \
+            --out . \
+            --only "**/mongo_crypt_v1.*" \
+            --strip-path-components 1
+          
+          # Find the crypt_shared library file in the current directory and set the CRYPT_SHARED_LIB_PATH to
+          # the path of that file. Only look for .so, .dll, or .dylib files to prevent matching any other
+          # downloaded files.
+          CRYPT_SHARED_LIB_PATH="$(find $(pwd) -maxdepth 1 -type f \
+            -name 'mongo_crypt_v1.so' -o \
+            -name 'mongo_crypt_v1.dll' -o \
+            -name 'mongo_crypt_v1.dylib')"
+          
+          # If we're on Windows, convert the "cygdrive" path to Windows-style paths.
+          if [ "Windows_NT" = "$OS" ]; then
+              CRYPT_SHARED_LIB_PATH=$(cygpath -m $CRYPT_SHARED_LIB_PATH)
+          fi
+          
+          echo "CRYPT_SHARED_LIB_PATH: $CRYPT_SHARED_LIB_PATH" >> crypt-expansion.yml
+
+    # Load the expansion file to make an evergreen variable with the current unique version
+    - command: expansions.update
+      params:
+        file: crypt-expansion.yml
 
   "delete serverless instance":
     - command: shell.exec