From 212631782453dbae0c76e1a00d2eb72f600e8935 Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Thu, 29 Jan 2026 10:33:25 -0800
Subject: [PATCH 01/16] test(NODE-7400): Test Node Driver 7.0.0 against latest
 version of BSON library

---
 .evergreen/config.yml | 82 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)

diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index 399010513e3..72823e0396c 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -29,6 +29,39 @@ functions:
     - command: expansions.update
       params:
         file: src/expansion.yml
+  fetch source 7.0.0:
+    - command: git.get_project
+      params:
+        directory: src
+        shallow_clone: true
+        script: |-
+          set -o errexit
+          set -o pipefail
+          git fetch origin 7.0.0 || git fetch origin v7.0.0 || true
+    - command: subprocess.exec
+      params:
+        working_dir: src
+        binary: bash
+        env:
+          is_patch: ${is_patch}
+          project: ${project}
+        args:
+          - .evergreen/prepare-shell.sh
+    - command: expansions.update
+      params:
+        file: src/expansion.yml
+    - command: subprocess.exec
+      params:
+        working_dir: src
+        binary: bash
+        env:
+          is_patch: ${is_patch}
+          project: ${project}
+        args:
+          - .evergreen/prepare-shell.sh
+    - command: expansions.update
+      params:
+        file: src/expansion.yml
   bootstrap mongo-orchestration:
     - command: subprocess.exec
       params:
@@ -639,6 +672,25 @@ functions:
         add_expansions_to_env: true
         args:
           - .evergreen/docker/alpine.sh
+  log state:
+    - command: shell.exec
+      params:
+        working_dir: "src"
+        shell: bash
+        script: |-
+          set -o errexit
+          set -o pipefail
+
+          echo "=== Driver state ==="
+          echo "Current commit:"
+          git rev-parse HEAD
+          echo
+          echo "Current branch / status:"
+          git status --short --branch || true
+          echo
+          echo "npm ls (full):"
+          npm ls
+          echo "=== end log state ==="
 tasks:
   - name: test-gcpkms-task
     commands:
@@ -3118,6 +3170,31 @@ tasks:
       - func: install dependencies
       - func: bootstrap mongo-orchestration
       - func: run tests
+  - name: test-bson-latest-server-7.0.0
+    tags:
+      - "bson-compat"
+      - "driver-7.0.0"
+    commands:
+      - command: expansions.update
+        type: setup
+        params:
+          updates:
+            # These VERSION/TOPOLOGY/AUTH/SSL expansions are used by bootstrap mongo-orchestration.
+            # Adjust to whatever topology you want for this compat test.
+            - { key: VERSION, value: "7.0" }
+            - { key: TOPOLOGY, value: "replica_set" }
+            - { key: AUTH, value: "auth" }
+            - { key: SSL, value: "ssl" }
+            - { key: NODE_LTS_VERSION, value: '24'}
+            # This is for the install package helper:
+            - { key: PACKAGE, value: "https://github.com/mongodb/js-bson#HEAD" }
+      - func: fetch source 7.0.0
+      - func: install dependencies
+      - func: install package
+      - func: log state
+      - func: bootstrap mongo-orchestration
+      - func: run unit tests
+      - func: run tests
 task_groups:
   - name: test_gcpkms_task_group
     setup_group_can_fail_task: true
@@ -3903,3 +3980,8 @@ buildvariants:
     run_on: rhel80-large
     tasks:
       - .ssl
+  - name: BSON compatibility tests
+    display_name: BSON compatibility tests
+    run_on: rhel80-large
+    tasks:
+      - test-bson-latest-server-7.0.0

From 4343e250b6c650ecbb5983184855a07e01457e1d Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Thu, 29 Jan 2026 13:38:35 -0800
Subject: [PATCH 02/16] build tool pasta time

---
 .evergreen/config.yml | 51 +++++++++++++------------------------------
 1 file changed, 15 insertions(+), 36 deletions(-)

diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index 72823e0396c..afb97f6e51a 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -17,27 +17,19 @@ functions:
       params:
         directory: src
         shallow_clone: true
-    - command: subprocess.exec
+    - command: shell.exec
       params:
         working_dir: src
-        binary: bash
-        env:
-          is_patch: ${is_patch}
-          project: ${project}
-        args:
-          - .evergreen/prepare-shell.sh
-    - command: expansions.update
-      params:
-        file: src/expansion.yml
-  fetch source 7.0.0:
-    - command: git.get_project
-      params:
-        directory: src
-        shallow_clone: true
-        script: |-
-          set -o errexit
-          set -o pipefail
-          git fetch origin 7.0.0 || git fetch origin v7.0.0 || true
+        shell: bash
+        script: |
+          set -euxo pipefail
+          # Only override if source_rev is set (use | to default to empty)
+          if [ "${source_rev|}" != "" ]; then
+            git reset --hard HEAD
+            git clean -xfd
+            git fetch origin "${source_rev}"
+            git checkout "${source_rev}"
+          fi
     - command: subprocess.exec
       params:
         working_dir: src
@@ -50,17 +42,6 @@ functions:
     - command: expansions.update
       params:
         file: src/expansion.yml
-    - command: subprocess.exec
-      params:
-        working_dir: src
-        binary: bash
-        env:
-          is_patch: ${is_patch}
-          project: ${project}
-        args:
-          - .evergreen/prepare-shell.sh
-    - command: expansions.update
-      params:
         file: src/expansion.yml
   bootstrap mongo-orchestration:
     - command: subprocess.exec
@@ -3179,22 +3160,18 @@ tasks:
         type: setup
         params:
           updates:
-            # These VERSION/TOPOLOGY/AUTH/SSL expansions are used by bootstrap mongo-orchestration.
-            # Adjust to whatever topology you want for this compat test.
             - { key: VERSION, value: "7.0" }
             - { key: TOPOLOGY, value: "replica_set" }
             - { key: AUTH, value: "auth" }
             - { key: SSL, value: "ssl" }
             - { key: NODE_LTS_VERSION, value: '24'}
-            # This is for the install package helper:
             - { key: PACKAGE, value: "https://github.com/mongodb/js-bson#HEAD" }
-      - func: fetch source 7.0.0
       - func: install dependencies
+      - func: bootstrap mongo-orchestration
+      - func: fetch source
       - func: install package
       - func: log state
-      - func: bootstrap mongo-orchestration
       - func: run unit tests
-      - func: run tests
 task_groups:
   - name: test_gcpkms_task_group
     setup_group_can_fail_task: true
@@ -3983,5 +3960,7 @@ buildvariants:
   - name: BSON compatibility tests
     display_name: BSON compatibility tests
     run_on: rhel80-large
+    expansions:
+      source_rev: 2512137b5d94b238e7cf5ee753f867e8d1e2e0fc
     tasks:
       - test-bson-latest-server-7.0.0

From bfc415641741f6fc7a93e75cfac9a7a67f5f2771 Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Thu, 29 Jan 2026 13:47:27 -0800
Subject: [PATCH 03/16] move changes to config.in.yml

---
 .evergreen/config.in.yml | 65 +++++++++++++++++++++++++++
 .evergreen/config.yml    | 96 ++++++++++++++++++++--------------------
 2 files changed, 113 insertions(+), 48 deletions(-)

diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index 2b5fa1eada1..89e937ee973 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -34,6 +34,21 @@ functions:
         directory: "src"
         shallow_clone: true # speed things up by limiting clone depth to 100
 
+    # Checkout the desired source revision if specified
+    - command: shell.exec
+      params:
+        working_dir: src
+        shell: bash
+        script: |
+          set -euxo pipefail
+          # Only override if source_rev is set (use | to default to empty)
+          if [ "${source_rev|}" != "" ]; then
+            git reset --hard HEAD
+            git clean -xfd
+            git fetch origin "${source_rev}"
+            git checkout "${source_rev}"
+          fi
+
     # Make an evergreen expansion file with dynamic values
     - command: subprocess.exec
       params:
@@ -955,6 +970,48 @@ tasks:
           args:
             - .evergreen/run-search-index-management-tests.sh
 
+  - name: test-bson-latest-server-7.0.0
+    tags:
+      - "bson-compat"
+      - "driver-7.0.0"
+    commands:
+      - command: expansions.update
+        type: setup
+        params:
+          updates:
+            - { key: VERSION, value: "7.0" }
+            - { key: TOPOLOGY, value: "replica_set" }
+            - { key: AUTH, value: "auth" }
+            - { key: SSL, value: "ssl" }
+            - { key: NODE_LTS_VERSION, value: '24'}
+            - { key: PACKAGE, value: "https://github.com/mongodb/js-bson#HEAD" }
+      - func: install dependencies
+      - func: bootstrap mongo-orchestration
+      - func: fetch source
+      - func: install package
+      - func: log state
+      - func: run unit tests
+
+  - name: log state
+    commands:
+      - command: shell.exec
+        params:
+          working_dir: "src"
+          shell: bash
+          script: |-
+            set -o errexit
+            set -o pipefail
+
+            echo "=== Driver state ==="
+            echo "Current commit:"
+            git rev-parse HEAD
+            echo
+            echo "Current branch / status:"
+            git status --short --branch || true
+            echo
+            echo "npm ls (full):"
+            npm ls
+            echo "=== end log state ==="
 task_groups:
   - name: test_gcpkms_task_group
     setup_group_can_fail_task: true
@@ -1216,6 +1273,14 @@ task_groups:
     tasks:
       - test-search-index-helpers
 
+  - name: BSON compatibility tests
+    display_name: BSON compatibility tests
+    run_on: rhel80-large
+    expansions:
+      source_rev: 2512137b5d94b238e7cf5ee753f867e8d1e2e0fc
+    tasks:
+      - test-bson-latest-server-7.0.0
+
 pre:
   - func: "fetch source"
   - func: "fix absolute paths"
diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index afb97f6e51a..527f5b4a5d3 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -42,7 +42,6 @@ functions:
     - command: expansions.update
       params:
         file: src/expansion.yml
-        file: src/expansion.yml
   bootstrap mongo-orchestration:
     - command: subprocess.exec
       params:
@@ -653,25 +652,6 @@ functions:
         add_expansions_to_env: true
         args:
           - .evergreen/docker/alpine.sh
-  log state:
-    - command: shell.exec
-      params:
-        working_dir: "src"
-        shell: bash
-        script: |-
-          set -o errexit
-          set -o pipefail
-
-          echo "=== Driver state ==="
-          echo "Current commit:"
-          git rev-parse HEAD
-          echo
-          echo "Current branch / status:"
-          git status --short --branch || true
-          echo
-          echo "npm ls (full):"
-          npm ls
-          echo "=== end log state ==="
 tasks:
   - name: test-gcpkms-task
     commands:
@@ -915,6 +895,47 @@ tasks:
           add_expansions_to_env: true
           args:
             - .evergreen/run-search-index-management-tests.sh
+  - name: test-bson-latest-server-7.0.0
+    tags:
+      - bson-compat
+      - driver-7.0.0
+    commands:
+      - command: expansions.update
+        type: setup
+        params:
+          updates:
+            - {key: VERSION, value: '7.0'}
+            - {key: TOPOLOGY, value: replica_set}
+            - {key: AUTH, value: auth}
+            - {key: SSL, value: ssl}
+            - {key: NODE_LTS_VERSION, value: '24'}
+            - {key: PACKAGE, value: https://github.com/mongodb/js-bson#HEAD}
+      - func: install dependencies
+      - func: bootstrap mongo-orchestration
+      - func: fetch source
+      - func: install package
+      - func: log state
+      - func: run unit tests
+  - name: log state
+    commands:
+      - command: shell.exec
+        params:
+          working_dir: src
+          shell: bash
+          script: |-
+            set -o errexit
+            set -o pipefail
+
+            echo "=== Driver state ==="
+            echo "Current commit:"
+            git rev-parse HEAD
+            echo
+            echo "Current branch / status:"
+            git status --short --branch || true
+            echo
+            echo "npm ls (full):"
+            npm ls
+            echo "=== end log state ==="
   - name: test-latest-server
     tags:
       - latest
@@ -3151,27 +3172,6 @@ tasks:
       - func: install dependencies
       - func: bootstrap mongo-orchestration
       - func: run tests
-  - name: test-bson-latest-server-7.0.0
-    tags:
-      - "bson-compat"
-      - "driver-7.0.0"
-    commands:
-      - command: expansions.update
-        type: setup
-        params:
-          updates:
-            - { key: VERSION, value: "7.0" }
-            - { key: TOPOLOGY, value: "replica_set" }
-            - { key: AUTH, value: "auth" }
-            - { key: SSL, value: "ssl" }
-            - { key: NODE_LTS_VERSION, value: '24'}
-            - { key: PACKAGE, value: "https://github.com/mongodb/js-bson#HEAD" }
-      - func: install dependencies
-      - func: bootstrap mongo-orchestration
-      - func: fetch source
-      - func: install package
-      - func: log state
-      - func: run unit tests
 task_groups:
   - name: test_gcpkms_task_group
     setup_group_can_fail_task: true
@@ -3422,6 +3422,13 @@ task_groups:
     setup_group_timeout_secs: 1800
     tasks:
       - test-search-index-helpers
+  - name: BSON compatibility tests
+    display_name: BSON compatibility tests
+    run_on: rhel80-large
+    expansions:
+      source_rev: 2512137b5d94b238e7cf5ee753f867e8d1e2e0fc
+    tasks:
+      - test-bson-latest-server-7.0.0
 pre:
   - func: fetch source
   - func: fix absolute paths
@@ -3957,10 +3964,3 @@ buildvariants:
     run_on: rhel80-large
     tasks:
       - .ssl
-  - name: BSON compatibility tests
-    display_name: BSON compatibility tests
-    run_on: rhel80-large
-    expansions:
-      source_rev: 2512137b5d94b238e7cf5ee753f867e8d1e2e0fc
-    tasks:
-      - test-bson-latest-server-7.0.0

From c87587cee0bfbc1e05a60257d12c3048c7d9e22f Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Thu, 29 Jan 2026 13:50:26 -0800
Subject: [PATCH 04/16] update func name

---
 .evergreen/config.in.yml | 4 ++--
 .evergreen/config.yml    | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index 89e937ee973..eb5278e2cfb 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -989,10 +989,10 @@ tasks:
       - func: bootstrap mongo-orchestration
       - func: fetch source
       - func: install package
-      - func: log state
+      - func: log-state
       - func: run unit tests
 
-  - name: log state
+  - name: log-state
     commands:
       - command: shell.exec
         params:
diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index 527f5b4a5d3..b0f565eb7b0 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -914,9 +914,9 @@ tasks:
       - func: bootstrap mongo-orchestration
       - func: fetch source
       - func: install package
-      - func: log state
+      - func: log-state
       - func: run unit tests
-  - name: log state
+  - name: log-state
     commands:
       - command: shell.exec
         params:

From 82094d6e9805a4fa00812525c38ebed1798881a2 Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Thu, 29 Jan 2026 13:53:08 -0800
Subject: [PATCH 05/16] moved funcs

---
 .evergreen/config.in.yml | 41 ++++++++++++++++++++--------------------
 .evergreen/config.yml    | 40 +++++++++++++++++++--------------------
 2 files changed, 41 insertions(+), 40 deletions(-)

diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index eb5278e2cfb..fc0982ca01c 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -970,6 +970,27 @@ tasks:
           args:
             - .evergreen/run-search-index-management-tests.sh
 
+  - name: log-state
+    commands:
+      - command: shell.exec
+        params:
+          working_dir: "src"
+          shell: bash
+          script: |-
+            set -o errexit
+            set -o pipefail
+
+            echo "=== Driver state ==="
+            echo "Current commit:"
+            git rev-parse HEAD
+            echo
+            echo "Current branch / status:"
+            git status --short --branch || true
+            echo
+            echo "npm ls (full):"
+            npm ls
+            echo "=== end log state ==="
+
   - name: test-bson-latest-server-7.0.0
     tags:
       - "bson-compat"
@@ -992,26 +1013,6 @@ tasks:
       - func: log-state
       - func: run unit tests
 
-  - name: log-state
-    commands:
-      - command: shell.exec
-        params:
-          working_dir: "src"
-          shell: bash
-          script: |-
-            set -o errexit
-            set -o pipefail
-
-            echo "=== Driver state ==="
-            echo "Current commit:"
-            git rev-parse HEAD
-            echo
-            echo "Current branch / status:"
-            git status --short --branch || true
-            echo
-            echo "npm ls (full):"
-            npm ls
-            echo "=== end log state ==="
 task_groups:
   - name: test_gcpkms_task_group
     setup_group_can_fail_task: true
diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index b0f565eb7b0..b7f3a09df0e 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -895,6 +895,26 @@ tasks:
           add_expansions_to_env: true
           args:
             - .evergreen/run-search-index-management-tests.sh
+  - name: log-state
+    commands:
+      - command: shell.exec
+        params:
+          working_dir: src
+          shell: bash
+          script: |-
+            set -o errexit
+            set -o pipefail
+
+            echo "=== Driver state ==="
+            echo "Current commit:"
+            git rev-parse HEAD
+            echo
+            echo "Current branch / status:"
+            git status --short --branch || true
+            echo
+            echo "npm ls (full):"
+            npm ls
+            echo "=== end log state ==="
   - name: test-bson-latest-server-7.0.0
     tags:
       - bson-compat
@@ -916,26 +936,6 @@ tasks:
       - func: install package
       - func: log-state
       - func: run unit tests
-  - name: log-state
-    commands:
-      - command: shell.exec
-        params:
-          working_dir: src
-          shell: bash
-          script: |-
-            set -o errexit
-            set -o pipefail
-
-            echo "=== Driver state ==="
-            echo "Current commit:"
-            git rev-parse HEAD
-            echo
-            echo "Current branch / status:"
-            git status --short --branch || true
-            echo
-            echo "npm ls (full):"
-            npm ls
-            echo "=== end log state ==="
   - name: test-latest-server
     tags:
       - latest

From fec362d1ed335be3c3961c9844a678edc9b4464a Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Thu, 29 Jan 2026 14:21:36 -0800
Subject: [PATCH 06/16] made log state a function

---
 .evergreen/config.in.yml | 50 ++++++++++++++++++++++------------------
 .evergreen/config.yml    | 48 +++++++++++++++++++++-----------------
 2 files changed, 55 insertions(+), 43 deletions(-)

diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index fc0982ca01c..1d01d63013f 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -718,6 +718,26 @@ functions:
         args:
           - .evergreen/docker/alpine.sh
 
+  "log state":
+    - command: shell.exec
+      params:
+        working_dir: "src"
+        shell: bash
+        script: |-
+          set -o errexit
+          set -o pipefail
+
+          echo "=== Driver state ==="
+          echo "Current commit:"
+          git rev-parse HEAD
+          echo
+          echo "Current branch / status:"
+          git status --short --branch || true
+          echo
+          echo "npm ls (full):"
+          npm ls
+          echo "=== end log state ==="
+
 tasks:
   - name: "test-gcpkms-task"
     commands:
@@ -970,27 +990,6 @@ tasks:
           args:
             - .evergreen/run-search-index-management-tests.sh
 
-  - name: log-state
-    commands:
-      - command: shell.exec
-        params:
-          working_dir: "src"
-          shell: bash
-          script: |-
-            set -o errexit
-            set -o pipefail
-
-            echo "=== Driver state ==="
-            echo "Current commit:"
-            git rev-parse HEAD
-            echo
-            echo "Current branch / status:"
-            git status --short --branch || true
-            echo
-            echo "npm ls (full):"
-            npm ls
-            echo "=== end log state ==="
-
   - name: test-bson-latest-server-7.0.0
     tags:
       - "bson-compat"
@@ -1010,7 +1009,7 @@ tasks:
       - func: bootstrap mongo-orchestration
       - func: fetch source
       - func: install package
-      - func: log-state
+      - func: log state
       - func: run unit tests
 
 task_groups:
@@ -1303,3 +1302,10 @@ buildvariants:
     run_on: ubuntu2204-small
     tasks:
       - .alpine-fle
+  - name: BSON compatibility tests
+    display_name: BSON compatibility tests
+    run_on: rhel80-large
+    expansions:
+      source_rev: 2512137b5d94b238e7cf5ee753f867e8d1e2e0fc
+    tasks:
+      - test-bson-latest-server-7.0.0
diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index b7f3a09df0e..79f511f82c1 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -652,6 +652,25 @@ functions:
         add_expansions_to_env: true
         args:
           - .evergreen/docker/alpine.sh
+  log state:
+    - command: shell.exec
+      params:
+        working_dir: src
+        shell: bash
+        script: |-
+          set -o errexit
+          set -o pipefail
+
+          echo "=== Driver state ==="
+          echo "Current commit:"
+          git rev-parse HEAD
+          echo
+          echo "Current branch / status:"
+          git status --short --branch || true
+          echo
+          echo "npm ls (full):"
+          npm ls
+          echo "=== end log state ==="
 tasks:
   - name: test-gcpkms-task
     commands:
@@ -895,26 +914,6 @@ tasks:
           add_expansions_to_env: true
           args:
             - .evergreen/run-search-index-management-tests.sh
-  - name: log-state
-    commands:
-      - command: shell.exec
-        params:
-          working_dir: src
-          shell: bash
-          script: |-
-            set -o errexit
-            set -o pipefail
-
-            echo "=== Driver state ==="
-            echo "Current commit:"
-            git rev-parse HEAD
-            echo
-            echo "Current branch / status:"
-            git status --short --branch || true
-            echo
-            echo "npm ls (full):"
-            npm ls
-            echo "=== end log state ==="
   - name: test-bson-latest-server-7.0.0
     tags:
       - bson-compat
@@ -934,7 +933,7 @@ tasks:
       - func: bootstrap mongo-orchestration
       - func: fetch source
       - func: install package
-      - func: log-state
+      - func: log state
       - func: run unit tests
   - name: test-latest-server
     tags:
@@ -3447,6 +3446,13 @@ buildvariants:
     run_on: ubuntu2204-small
     tasks:
       - .alpine-fle
+  - name: BSON compatibility tests
+    display_name: BSON compatibility tests
+    run_on: rhel80-large
+    expansions:
+      source_rev: 2512137b5d94b238e7cf5ee753f867e8d1e2e0fc
+    tasks:
+      - test-bson-latest-server-7.0.0
   - name: rhel80-large-iron
     display_name: rhel8 Node20.19.0
     run_on: rhel80-large

From e8ee4d53c9b3b651f6d2b71c16a99200aa3a3407 Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Thu, 29 Jan 2026 14:32:31 -0800
Subject: [PATCH 07/16] remove extraneous taskgroup

---
 .evergreen/config.in.yml | 8 --------
 .evergreen/config.yml    | 7 -------
 2 files changed, 15 deletions(-)

diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index 1d01d63013f..c8357f8e855 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -1273,14 +1273,6 @@ task_groups:
     tasks:
       - test-search-index-helpers
 
-  - name: BSON compatibility tests
-    display_name: BSON compatibility tests
-    run_on: rhel80-large
-    expansions:
-      source_rev: 2512137b5d94b238e7cf5ee753f867e8d1e2e0fc
-    tasks:
-      - test-bson-latest-server-7.0.0
-
 pre:
   - func: "fetch source"
   - func: "fix absolute paths"
diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index 79f511f82c1..54c17b05fe4 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -3421,13 +3421,6 @@ task_groups:
     setup_group_timeout_secs: 1800
     tasks:
       - test-search-index-helpers
-  - name: BSON compatibility tests
-    display_name: BSON compatibility tests
-    run_on: rhel80-large
-    expansions:
-      source_rev: 2512137b5d94b238e7cf5ee753f867e8d1e2e0fc
-    tasks:
-      - test-bson-latest-server-7.0.0
 pre:
   - func: fetch source
   - func: fix absolute paths

From a047acee98800b2a84dcd5897000b41be1db3b09 Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Thu, 29 Jan 2026 14:47:52 -0800
Subject: [PATCH 08/16] use tag instead of commit hash

---
 .evergreen/config.in.yml | 2 +-
 .evergreen/config.yml    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index c8357f8e855..956026c9bf8 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -1298,6 +1298,6 @@ buildvariants:
     display_name: BSON compatibility tests
     run_on: rhel80-large
     expansions:
-      source_rev: 2512137b5d94b238e7cf5ee753f867e8d1e2e0fc
+      source_rev: refs/tags/v7.0.0
     tasks:
       - test-bson-latest-server-7.0.0
diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index 54c17b05fe4..26a5e7042aa 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -3443,7 +3443,7 @@ buildvariants:
     display_name: BSON compatibility tests
     run_on: rhel80-large
     expansions:
-      source_rev: 2512137b5d94b238e7cf5ee753f867e8d1e2e0fc
+      source_rev: refs/tags/v7.0.0
     tasks:
       - test-bson-latest-server-7.0.0
   - name: rhel80-large-iron

From 1dcdde2a01d5010400276f80f360e46099d96c5d Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Fri, 30 Jan 2026 09:21:10 -0800
Subject: [PATCH 09/16] drop unnecessary configs

---
 .evergreen/config.in.yml | 8 +-------
 .evergreen/config.yml    | 8 +-------
 2 files changed, 2 insertions(+), 14 deletions(-)

diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index 956026c9bf8..2138ed8a6f5 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -991,18 +991,12 @@ tasks:
             - .evergreen/run-search-index-management-tests.sh
 
   - name: test-bson-latest-server-7.0.0
-    tags:
-      - "bson-compat"
-      - "driver-7.0.0"
     commands:
       - command: expansions.update
         type: setup
         params:
           updates:
-            - { key: VERSION, value: "7.0" }
-            - { key: TOPOLOGY, value: "replica_set" }
-            - { key: AUTH, value: "auth" }
-            - { key: SSL, value: "ssl" }
+            - { key: VERSION, value: "latest" }
             - { key: NODE_LTS_VERSION, value: '24'}
             - { key: PACKAGE, value: "https://github.com/mongodb/js-bson#HEAD" }
       - func: install dependencies
diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index 26a5e7042aa..4f448d38a2c 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -915,18 +915,12 @@ tasks:
           args:
             - .evergreen/run-search-index-management-tests.sh
   - name: test-bson-latest-server-7.0.0
-    tags:
-      - bson-compat
-      - driver-7.0.0
     commands:
       - command: expansions.update
         type: setup
         params:
           updates:
-            - {key: VERSION, value: '7.0'}
-            - {key: TOPOLOGY, value: replica_set}
-            - {key: AUTH, value: auth}
-            - {key: SSL, value: ssl}
+            - {key: VERSION, value: latest}
             - {key: NODE_LTS_VERSION, value: '24'}
             - {key: PACKAGE, value: https://github.com/mongodb/js-bson#HEAD}
       - func: install dependencies

From 41be451f7ffe1d8e795b24ec6f6223f36c82ae1f Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Fri, 30 Jan 2026 10:28:54 -0800
Subject: [PATCH 10/16] add tasks for runnning integ tests against every
 topology

---
 .evergreen/config.in.yml | 118 +++++++++++++++++++++++++++++++--------
 .evergreen/config.yml    | 109 +++++++++++++++++++++++++++++-------
 2 files changed, 182 insertions(+), 45 deletions(-)

diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index 2138ed8a6f5..aa30354980d 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -34,21 +34,6 @@ functions:
         directory: "src"
         shallow_clone: true # speed things up by limiting clone depth to 100
 
-    # Checkout the desired source revision if specified
-    - command: shell.exec
-      params:
-        working_dir: src
-        shell: bash
-        script: |
-          set -euxo pipefail
-          # Only override if source_rev is set (use | to default to empty)
-          if [ "${source_rev|}" != "" ]; then
-            git reset --hard HEAD
-            git clean -xfd
-            git fetch origin "${source_rev}"
-            git checkout "${source_rev}"
-          fi
-
     # Make an evergreen expansion file with dynamic values
     - command: subprocess.exec
       params:
@@ -65,6 +50,19 @@ functions:
       params:
         file: src/expansion.yml
 
+  "switch source":
+    # Checkout the desired source revision if specified
+    - command: shell.exec
+      params:
+        working_dir: src
+        shell: bash
+        script: |
+          set -euxo pipefail
+          git reset --hard HEAD
+          git clean -xfd
+          git fetch origin "${SOURCE_REV}"
+          git checkout "${SOURCE_REV}"
+
   "bootstrap mongo-orchestration":
     - command: subprocess.exec
       params:
@@ -990,22 +988,93 @@ tasks:
           args:
             - .evergreen/run-search-index-management-tests.sh
 
-  - name: test-bson-latest-server-7.0.0
+  - name: test-bson-latest-server-7.0.0-unit-tests
     commands:
       - command: expansions.update
         type: setup
         params:
           updates:
-            - { key: VERSION, value: "latest" }
-            - { key: NODE_LTS_VERSION, value: '24'}
-            - { key: PACKAGE, value: "https://github.com/mongodb/js-bson#HEAD" }
+            - {key: VERSION, value: latest}
+            - {key: NODE_LTS_VERSION, value: '20.19.0'}
       - func: install dependencies
-      - func: bootstrap mongo-orchestration
-      - func: fetch source
+      - func: switch source
+        vars:
+          SOURCE_REV: refs/tags/v7.0.0
       - func: install package
+        vars:
+          PACKAGE: https://github.com/mongodb/js-bson#HEAD
       - func: log state
       - func: run unit tests
 
+  - name: test-bson-latest-server-7.0.0-server-tests
+    commands:
+      - command: expansions.update
+        type: setup
+        params:
+          updates:
+            - {key: VERSION, value: latest}
+            - {key: TOPOLOGY, value: server}
+            - {key: AUTH, value: noauth}
+            - {key: SSL, value: nossl}
+            - {key: CLIENT_ENCRYPTION, value: 'false'}
+            - {key: NODE_LTS_VERSION, value: '20.19.0'}
+      - func: install dependencies
+      - func: bootstrap mongo-orchestration
+      - func: switch source
+        vars:
+          SOURCE_REV: refs/tags/v7.0.0
+      - func: install package
+        vars:
+          PACKAGE: https://github.com/mongodb/js-bson#HEAD
+      - func: log state
+      - func: run tests
+
+  - name: test-bson-latest-server-7.0.0-replica_set-tests
+    commands:
+      - command: expansions.update
+        type: setup
+        params:
+          updates:
+            - {key: VERSION, value: latest}
+            - {key: TOPOLOGY, value: replica_set}
+            - {key: AUTH, value: noauth}
+            - {key: SSL, value: nossl}
+            - {key: CLIENT_ENCRYPTION, value: 'false'}
+            - {key: NODE_LTS_VERSION, value: '20.19.0'}
+      - func: install dependencies
+      - func: bootstrap mongo-orchestration
+      - func: switch source
+        vars:
+          SOURCE_REV: refs/tags/v7.0.0
+      - func: install package
+        vars:
+          PACKAGE: https://github.com/mongodb/js-bson#HEAD
+      - func: log state
+      - func: run tests
+
+  - name: test-bson-latest-server-7.0.0-sharded_cluster-tests
+    commands:
+      - command: expansions.update
+        type: setup
+        params:
+          updates:
+            - {key: VERSION, value: latest}
+            - {key: TOPOLOGY, value: sharded_cluster}
+            - {key: AUTH, value: noauth}
+            - {key: SSL, value: nossl}
+            - {key: CLIENT_ENCRYPTION, value: 'false'}
+            - {key: NODE_LTS_VERSION, value: '20.19.0'}
+      - func: install dependencies
+      - func: bootstrap mongo-orchestration
+      - func: switch source
+        vars:
+          SOURCE_REV: refs/tags/v7.0.0
+      - func: install package
+        vars:
+          PACKAGE: https://github.com/mongodb/js-bson#HEAD
+      - func: log state
+      - func: run tests
+
 task_groups:
   - name: test_gcpkms_task_group
     setup_group_can_fail_task: true
@@ -1291,7 +1360,8 @@ buildvariants:
   - name: BSON compatibility tests
     display_name: BSON compatibility tests
     run_on: rhel80-large
-    expansions:
-      source_rev: refs/tags/v7.0.0
     tasks:
-      - test-bson-latest-server-7.0.0
+      - test-bson-latest-server-7.0.0-unit-tests
+      - test-bson-latest-server-7.0.0-server-tests
+      - test-bson-latest-server-7.0.0-replica_set-tests
+      - test-bson-latest-server-7.0.0-sharded_cluster-tests
diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index 4f448d38a2c..1b4afba7963 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -17,19 +17,6 @@ functions:
       params:
         directory: src
         shallow_clone: true
-    - command: shell.exec
-      params:
-        working_dir: src
-        shell: bash
-        script: |
-          set -euxo pipefail
-          # Only override if source_rev is set (use | to default to empty)
-          if [ "${source_rev|}" != "" ]; then
-            git reset --hard HEAD
-            git clean -xfd
-            git fetch origin "${source_rev}"
-            git checkout "${source_rev}"
-          fi
     - command: subprocess.exec
       params:
         working_dir: src
@@ -42,6 +29,17 @@ functions:
     - command: expansions.update
       params:
         file: src/expansion.yml
+  switch source:
+    - command: shell.exec
+      params:
+        working_dir: src
+        shell: bash
+        script: |
+          set -euxo pipefail
+          git reset --hard HEAD
+          git clean -xfd
+          git fetch origin "${SOURCE_REV}"
+          git checkout "${SOURCE_REV}"
   bootstrap mongo-orchestration:
     - command: subprocess.exec
       params:
@@ -914,21 +912,89 @@ tasks:
           add_expansions_to_env: true
           args:
             - .evergreen/run-search-index-management-tests.sh
-  - name: test-bson-latest-server-7.0.0
+  - name: test-bson-latest-server-7.0.0-unit-tests
     commands:
       - command: expansions.update
         type: setup
         params:
           updates:
             - {key: VERSION, value: latest}
-            - {key: NODE_LTS_VERSION, value: '24'}
-            - {key: PACKAGE, value: https://github.com/mongodb/js-bson#HEAD}
+            - {key: NODE_LTS_VERSION, value: 20.19.0}
       - func: install dependencies
-      - func: bootstrap mongo-orchestration
-      - func: fetch source
+      - func: switch source
+        vars:
+          SOURCE_REV: refs/tags/v7.0.0
       - func: install package
+        vars:
+          PACKAGE: https://github.com/mongodb/js-bson#HEAD
       - func: log state
       - func: run unit tests
+  - name: test-bson-latest-server-7.0.0-server-tests
+    commands:
+      - command: expansions.update
+        type: setup
+        params:
+          updates:
+            - {key: VERSION, value: latest}
+            - {key: TOPOLOGY, value: server}
+            - {key: AUTH, value: noauth}
+            - {key: SSL, value: nossl}
+            - {key: CLIENT_ENCRYPTION, value: 'false'}
+            - {key: NODE_LTS_VERSION, value: 20.19.0}
+      - func: install dependencies
+      - func: bootstrap mongo-orchestration
+      - func: switch source
+        vars:
+          SOURCE_REV: refs/tags/v7.0.0
+      - func: install package
+        vars:
+          PACKAGE: https://github.com/mongodb/js-bson#HEAD
+      - func: log state
+      - func: run tests
+  - name: test-bson-latest-server-7.0.0-replica_set-tests
+    commands:
+      - command: expansions.update
+        type: setup
+        params:
+          updates:
+            - {key: VERSION, value: latest}
+            - {key: TOPOLOGY, value: replica_set}
+            - {key: AUTH, value: noauth}
+            - {key: SSL, value: nossl}
+            - {key: CLIENT_ENCRYPTION, value: 'false'}
+            - {key: NODE_LTS_VERSION, value: 20.19.0}
+      - func: install dependencies
+      - func: bootstrap mongo-orchestration
+      - func: switch source
+        vars:
+          SOURCE_REV: refs/tags/v7.0.0
+      - func: install package
+        vars:
+          PACKAGE: https://github.com/mongodb/js-bson#HEAD
+      - func: log state
+      - func: run tests
+  - name: test-bson-latest-server-7.0.0-sharded_cluster-tests
+    commands:
+      - command: expansions.update
+        type: setup
+        params:
+          updates:
+            - {key: VERSION, value: latest}
+            - {key: TOPOLOGY, value: sharded_cluster}
+            - {key: AUTH, value: noauth}
+            - {key: SSL, value: nossl}
+            - {key: CLIENT_ENCRYPTION, value: 'false'}
+            - {key: NODE_LTS_VERSION, value: 20.19.0}
+      - func: install dependencies
+      - func: bootstrap mongo-orchestration
+      - func: switch source
+        vars:
+          SOURCE_REV: refs/tags/v7.0.0
+      - func: install package
+        vars:
+          PACKAGE: https://github.com/mongodb/js-bson#HEAD
+      - func: log state
+      - func: run tests
   - name: test-latest-server
     tags:
       - latest
@@ -3436,10 +3502,11 @@ buildvariants:
   - name: BSON compatibility tests
     display_name: BSON compatibility tests
     run_on: rhel80-large
-    expansions:
-      source_rev: refs/tags/v7.0.0
     tasks:
-      - test-bson-latest-server-7.0.0
+      - test-bson-latest-server-7.0.0-unit-tests
+      - test-bson-latest-server-7.0.0-server-tests
+      - test-bson-latest-server-7.0.0-replica_set-tests
+      - test-bson-latest-server-7.0.0-sharded_cluster-tests
   - name: rhel80-large-iron
     display_name: rhel8 Node20.19.0
     run_on: rhel80-large

From 6cea79c28d90e1850c2a8f8afbddc885104826bf Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Fri, 30 Jan 2026 12:25:37 -0800
Subject: [PATCH 11/16] rename tasks

---
 .evergreen/config.in.yml | 8 ++++----
 .evergreen/config.yml    | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index aa30354980d..0a7691fcbcb 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -988,7 +988,7 @@ tasks:
           args:
             - .evergreen/run-search-index-management-tests.sh
 
-  - name: test-bson-latest-server-7.0.0-unit-tests
+  - name: test-bson-latest-driver-7.0.0-unit-tests
     commands:
       - command: expansions.update
         type: setup
@@ -1006,7 +1006,7 @@ tasks:
       - func: log state
       - func: run unit tests
 
-  - name: test-bson-latest-server-7.0.0-server-tests
+  - name: test-bson-latest-driver-7.0.0-server-tests
     commands:
       - command: expansions.update
         type: setup
@@ -1029,7 +1029,7 @@ tasks:
       - func: log state
       - func: run tests
 
-  - name: test-bson-latest-server-7.0.0-replica_set-tests
+  - name: test-bson-latest-driver-7.0.0-replica_set-tests
     commands:
       - command: expansions.update
         type: setup
@@ -1052,7 +1052,7 @@ tasks:
       - func: log state
       - func: run tests
 
-  - name: test-bson-latest-server-7.0.0-sharded_cluster-tests
+  - name: test-bson-latest-driver-7.0.0-sharded_cluster-tests
     commands:
       - command: expansions.update
         type: setup
diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index 1b4afba7963..aca746324d3 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -912,7 +912,7 @@ tasks:
           add_expansions_to_env: true
           args:
             - .evergreen/run-search-index-management-tests.sh
-  - name: test-bson-latest-server-7.0.0-unit-tests
+  - name: test-bson-latest-driver-7.0.0-unit-tests
     commands:
       - command: expansions.update
         type: setup
@@ -929,7 +929,7 @@ tasks:
           PACKAGE: https://github.com/mongodb/js-bson#HEAD
       - func: log state
       - func: run unit tests
-  - name: test-bson-latest-server-7.0.0-server-tests
+  - name: test-bson-latest-driver-7.0.0-server-tests
     commands:
       - command: expansions.update
         type: setup
@@ -951,7 +951,7 @@ tasks:
           PACKAGE: https://github.com/mongodb/js-bson#HEAD
       - func: log state
       - func: run tests
-  - name: test-bson-latest-server-7.0.0-replica_set-tests
+  - name: test-bson-latest-driver-7.0.0-replica_set-tests
     commands:
       - command: expansions.update
         type: setup
@@ -973,7 +973,7 @@ tasks:
           PACKAGE: https://github.com/mongodb/js-bson#HEAD
       - func: log state
       - func: run tests
-  - name: test-bson-latest-server-7.0.0-sharded_cluster-tests
+  - name: test-bson-latest-driver-7.0.0-sharded_cluster-tests
     commands:
       - command: expansions.update
         type: setup

From 27e1d5fe2bf553a687ab9b87f106d695fcde4718 Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Fri, 30 Jan 2026 12:28:13 -0800
Subject: [PATCH 12/16] rename everywhere

---
 .evergreen/config.in.yml | 8 ++++----
 .evergreen/config.yml    | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index 0a7691fcbcb..9948ba35222 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -1361,7 +1361,7 @@ buildvariants:
     display_name: BSON compatibility tests
     run_on: rhel80-large
     tasks:
-      - test-bson-latest-server-7.0.0-unit-tests
-      - test-bson-latest-server-7.0.0-server-tests
-      - test-bson-latest-server-7.0.0-replica_set-tests
-      - test-bson-latest-server-7.0.0-sharded_cluster-tests
+      - test-bson-latest-driver-7.0.0-unit-tests
+      - test-bson-latest-driver-7.0.0-server-tests
+      - test-bson-latest-driver-7.0.0-replica_set-tests
+      - test-bson-latest-driver-7.0.0-sharded_cluster-tests
diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index aca746324d3..be2183b58df 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -3503,10 +3503,10 @@ buildvariants:
     display_name: BSON compatibility tests
     run_on: rhel80-large
     tasks:
-      - test-bson-latest-server-7.0.0-unit-tests
-      - test-bson-latest-server-7.0.0-server-tests
-      - test-bson-latest-server-7.0.0-replica_set-tests
-      - test-bson-latest-server-7.0.0-sharded_cluster-tests
+      - test-bson-latest-driver-7.0.0-unit-tests
+      - test-bson-latest-driver-7.0.0-server-tests
+      - test-bson-latest-driver-7.0.0-replica_set-tests
+      - test-bson-latest-driver-7.0.0-sharded_cluster-tests
   - name: rhel80-large-iron
     display_name: rhel8 Node20.19.0
     run_on: rhel80-large

From f2943081ece2f33e5bf54ae74d5137b106157bf7 Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Fri, 30 Jan 2026 15:06:29 -0800
Subject: [PATCH 13/16] lint fix

---
 .evergreen/config.in.yml | 40 ++++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 20 deletions(-)

diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index 9948ba35222..5d0f2ff4ca4 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -994,8 +994,8 @@ tasks:
         type: setup
         params:
           updates:
-            - {key: VERSION, value: latest}
-            - {key: NODE_LTS_VERSION, value: '20.19.0'}
+            - { key: VERSION, value: latest }
+            - { key: NODE_LTS_VERSION, value: "20.19.0" }
       - func: install dependencies
       - func: switch source
         vars:
@@ -1012,12 +1012,12 @@ tasks:
         type: setup
         params:
           updates:
-            - {key: VERSION, value: latest}
-            - {key: TOPOLOGY, value: server}
-            - {key: AUTH, value: noauth}
-            - {key: SSL, value: nossl}
-            - {key: CLIENT_ENCRYPTION, value: 'false'}
-            - {key: NODE_LTS_VERSION, value: '20.19.0'}
+            - { key: VERSION, value: latest }
+            - { key: TOPOLOGY, value: server }
+            - { key: AUTH, value: noauth }
+            - { key: SSL, value: nossl }
+            - { key: CLIENT_ENCRYPTION, value: "false" }
+            - { key: NODE_LTS_VERSION, value: "20.19.0" }
       - func: install dependencies
       - func: bootstrap mongo-orchestration
       - func: switch source
@@ -1035,12 +1035,12 @@ tasks:
         type: setup
         params:
           updates:
-            - {key: VERSION, value: latest}
-            - {key: TOPOLOGY, value: replica_set}
-            - {key: AUTH, value: noauth}
-            - {key: SSL, value: nossl}
-            - {key: CLIENT_ENCRYPTION, value: 'false'}
-            - {key: NODE_LTS_VERSION, value: '20.19.0'}
+            - { key: VERSION, value: latest }
+            - { key: TOPOLOGY, value: replica_set }
+            - { key: AUTH, value: noauth }
+            - { key: SSL, value: nossl }
+            - { key: CLIENT_ENCRYPTION, value: "false" }
+            - { key: NODE_LTS_VERSION, value: "20.19.0" }
       - func: install dependencies
       - func: bootstrap mongo-orchestration
       - func: switch source
@@ -1058,12 +1058,12 @@ tasks:
         type: setup
         params:
           updates:
-            - {key: VERSION, value: latest}
-            - {key: TOPOLOGY, value: sharded_cluster}
-            - {key: AUTH, value: noauth}
-            - {key: SSL, value: nossl}
-            - {key: CLIENT_ENCRYPTION, value: 'false'}
-            - {key: NODE_LTS_VERSION, value: '20.19.0'}
+            - { key: VERSION, value: latest }
+            - { key: TOPOLOGY, value: sharded_cluster }
+            - { key: AUTH, value: noauth }
+            - { key: SSL, value: nossl }
+            - { key: CLIENT_ENCRYPTION, value: "false" }
+            - { key: NODE_LTS_VERSION, value: "20.19.0" }
       - func: install dependencies
       - func: bootstrap mongo-orchestration
       - func: switch source

From 62a4c900ecfe50b5fe267d775cc7f3f58fcd9071 Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Fri, 30 Jan 2026 16:30:46 -0800
Subject: [PATCH 14/16] don't git clean when switching source

---
 .evergreen/config.in.yml | 7 +++----
 .evergreen/config.yml    | 7 +++----
 2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index 5d0f2ff4ca4..f80b66f544c 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -59,7 +59,6 @@ functions:
         script: |
           set -euxo pipefail
           git reset --hard HEAD
-          git clean -xfd
           git fetch origin "${SOURCE_REV}"
           git checkout "${SOURCE_REV}"
 
@@ -1014,7 +1013,7 @@ tasks:
           updates:
             - { key: VERSION, value: latest }
             - { key: TOPOLOGY, value: server }
-            - { key: AUTH, value: noauth }
+            - { key: AUTH, value: auth }
             - { key: SSL, value: nossl }
             - { key: CLIENT_ENCRYPTION, value: "false" }
             - { key: NODE_LTS_VERSION, value: "20.19.0" }
@@ -1037,7 +1036,7 @@ tasks:
           updates:
             - { key: VERSION, value: latest }
             - { key: TOPOLOGY, value: replica_set }
-            - { key: AUTH, value: noauth }
+            - { key: AUTH, value: auth }
             - { key: SSL, value: nossl }
             - { key: CLIENT_ENCRYPTION, value: "false" }
             - { key: NODE_LTS_VERSION, value: "20.19.0" }
@@ -1060,7 +1059,7 @@ tasks:
           updates:
             - { key: VERSION, value: latest }
             - { key: TOPOLOGY, value: sharded_cluster }
-            - { key: AUTH, value: noauth }
+            - { key: AUTH, value: auth }
             - { key: SSL, value: nossl }
             - { key: CLIENT_ENCRYPTION, value: "false" }
             - { key: NODE_LTS_VERSION, value: "20.19.0" }
diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index be2183b58df..594933adb66 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -37,7 +37,6 @@ functions:
         script: |
           set -euxo pipefail
           git reset --hard HEAD
-          git clean -xfd
           git fetch origin "${SOURCE_REV}"
           git checkout "${SOURCE_REV}"
   bootstrap mongo-orchestration:
@@ -937,7 +936,7 @@ tasks:
           updates:
             - {key: VERSION, value: latest}
             - {key: TOPOLOGY, value: server}
-            - {key: AUTH, value: noauth}
+            - {key: AUTH, value: auth}
             - {key: SSL, value: nossl}
             - {key: CLIENT_ENCRYPTION, value: 'false'}
             - {key: NODE_LTS_VERSION, value: 20.19.0}
@@ -959,7 +958,7 @@ tasks:
           updates:
             - {key: VERSION, value: latest}
             - {key: TOPOLOGY, value: replica_set}
-            - {key: AUTH, value: noauth}
+            - {key: AUTH, value: auth}
             - {key: SSL, value: nossl}
             - {key: CLIENT_ENCRYPTION, value: 'false'}
             - {key: NODE_LTS_VERSION, value: 20.19.0}
@@ -981,7 +980,7 @@ tasks:
           updates:
             - {key: VERSION, value: latest}
             - {key: TOPOLOGY, value: sharded_cluster}
-            - {key: AUTH, value: noauth}
+            - {key: AUTH, value: auth}
             - {key: SSL, value: nossl}
             - {key: CLIENT_ENCRYPTION, value: 'false'}
             - {key: NODE_LTS_VERSION, value: 20.19.0}

From 1c92e047662da89abaadcfc91ae680068148229c Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@mongodb.com>
Date: Mon, 2 Feb 2026 08:25:37 -0800
Subject: [PATCH 15/16] Update .evergreen/config.in.yml

Co-authored-by: Bailey Pearson <bailey.pearson@gmail.com>
---
 .evergreen/config.in.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index f80b66f544c..29587cdc52c 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -61,6 +61,7 @@ functions:
           git reset --hard HEAD
           git fetch origin "${SOURCE_REV}"
           git checkout "${SOURCE_REV}"
+          npm i
 
   "bootstrap mongo-orchestration":
     - command: subprocess.exec

From e09d9bcac2390992195a215858c1a137b0e63196 Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Mon, 2 Feb 2026 08:50:42 -0800
Subject: [PATCH 16/16] regenerate config.yml

---
 .evergreen/config.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index 594933adb66..d357b5e855b 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -39,6 +39,7 @@ functions:
           git reset --hard HEAD
           git fetch origin "${SOURCE_REV}"
           git checkout "${SOURCE_REV}"
+          npm i
   bootstrap mongo-orchestration:
     - command: subprocess.exec
       params: