PHPLIB-1038: Use activate-kmstlsvenv.sh and find-python3.sh in Evergreen config (#1017)

* PHPLIB-1038: Use activate-kmstlsvenv.sh in Evergreen config

* Use find-python3.sh in "create serverless instance" function

PYTHON3_BINARY was never declared. The original code only worked thanks to the shebang in mongodl.py.

* find-python3.sh and activate-kmstlsvenv.sh require bash

* Remove Windows-specific logic from "create serverless instance" function

Serverless is only tested on Debian hosts

Author: jmikola

.evergreen/config.yml

@@ -214,47 +214,45 @@ functions:
         file: src/serverless-expansion.yml
     - command: shell.exec
       params:
-        shell: "bash"
+        shell: bash
         script: |
           ${PREPARE_SHELL}
-          
+
           if [ -z "${SERVERLESS_MONGODB_VERSION}" ]; then
             echo "expected SERVERLESS_MONGODB_VERSION to be set"
             exit 1
           fi
-          
+
+          . ${DRIVERS_TOOLS}/.evergreen/find-python3.sh
+          PYTHON_BINARY="$(find_python3)" || exit 1
+
           # 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 \
+          ${PYTHON_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 \
+          ${PYTHON_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
@@ -429,18 +427,20 @@ functions:
     - command: shell.exec
       # Init venv without background:true to install dependencies
       params:
+        shell: bash
         script: |-
           set -o errexit
           cd ${DRIVERS_TOOLS}/.evergreen/csfle
-          . ./activate_venv.sh
+          . ./activate-kmstlsvenv.sh
     - command: shell.exec
       params:
         background: true
+        shell: bash
         # Use different ports for KMS HTTP servers to avoid conflicts with load balancers
         script: |-
           set -o errexit
           cd ${DRIVERS_TOOLS}/.evergreen/csfle
-          . ./activate_venv.sh
+          . ./activate-kmstlsvenv.sh
           python -u kms_http_server.py --ca_file ../x509gen/ca.pem --cert_file ../x509gen/expired.pem --port 8100 &
           python -u kms_http_server.py --ca_file ../x509gen/ca.pem --cert_file ../x509gen/wrong-host.pem --port 8101 &
           python -u kms_http_server.py --ca_file ../x509gen/ca.pem --cert_file ../x509gen/server.pem --port 8102 --require_client_cert &
@@ -473,7 +473,7 @@ functions:
           export AWS_DEFAULT_REGION="us-east-1"
 
           pushd ${DRIVERS_TOOLS}/.evergreen/csfle
-          . ./activate_venv.sh
+          . ./activate-kmstlsvenv.sh
           . ./set-temp-creds.sh
           popd