PYTHON-5862 Address PR feedback: export UV vars before sourcing setup-dev-env, make UV_EXCLUDE_NEWER conditional in GHA

- combine-coverage.sh: export UV_NO_LOCK and UV_EXCLUDE_NEWER before sourcing
  setup-dev-env.sh, which calls uv sync internally; without this the first sync
  ran without the intended settings
- test-python.yml: use ${UV_EXCLUDE_NEWER:-$(date ...)} so the computed default
  does not overwrite a value already set via repository/environment variables

Author: aclark4life

.evergreen/combine-coverage.sh

@@ -5,10 +5,12 @@
 
 set -eu
 
-# Set up the virtual env.
-. .evergreen/scripts/setup-dev-env.sh
+# Export before sourcing so that any uv sync inside setup-dev-env.sh uses them.
 export UV_NO_LOCK=1
 export UV_EXCLUDE_NEWER="${UV_EXCLUDE_NEWER:-$(python3 -c 'from datetime import datetime, timedelta, timezone; print((datetime.now(timezone.utc) - timedelta(days=7)).strftime("%Y-%m-%dT%H:%M:%SZ"))')}"
+
+# Set up the virtual env.
+. .evergreen/scripts/setup-dev-env.sh
 uv sync --group coverage
 source .venv/bin/activate
 

.github/workflows/test-python.yml

@@ -34,7 +34,7 @@ jobs:
           enable-cache: true
           python-version: "3.10"
       - name: Set UV_EXCLUDE_NEWER
-        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
+        run: echo "UV_EXCLUDE_NEWER=${UV_EXCLUDE_NEWER:-$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')}" >> $GITHUB_ENV
       - name: Install just
         run: uv tool install rust-just
       - name: Install Python dependencies
@@ -78,7 +78,7 @@ jobs:
           enable-cache: true
           python-version: ${{ matrix.python-version }}
       - name: Set UV_EXCLUDE_NEWER
-        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
+        run: echo "UV_EXCLUDE_NEWER=${UV_EXCLUDE_NEWER:-$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')}" >> $GITHUB_ENV
       - id: setup-mongodb
         uses: mongodb-labs/drivers-evergreen-tools@master
         with:
@@ -102,7 +102,7 @@ jobs:
           enable-cache: true
           python-version: "3.10"
       - name: Set UV_EXCLUDE_NEWER
-        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
+        run: echo "UV_EXCLUDE_NEWER=${UV_EXCLUDE_NEWER:-$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')}" >> $GITHUB_ENV
       - id: setup-mongodb
         uses: mongodb-labs/drivers-evergreen-tools@master
         with:
@@ -132,7 +132,7 @@ jobs:
           enable-cache: true
           python-version: "3.10"
       - name: Set UV_EXCLUDE_NEWER
-        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
+        run: echo "UV_EXCLUDE_NEWER=${UV_EXCLUDE_NEWER:-$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')}" >> $GITHUB_ENV
       - name: Install just
         run: uv tool install rust-just
       - id: setup-mongodb
@@ -159,7 +159,7 @@ jobs:
           enable-cache: true
           python-version: "3.10"
       - name: Set UV_EXCLUDE_NEWER
-        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
+        run: echo "UV_EXCLUDE_NEWER=${UV_EXCLUDE_NEWER:-$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')}" >> $GITHUB_ENV
       - name: Install just
         run: uv tool install rust-just
       - name: Install dependencies
@@ -180,7 +180,7 @@ jobs:
           enable-cache: true
           python-version: "3.10"
       - name: Set UV_EXCLUDE_NEWER
-        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
+        run: echo "UV_EXCLUDE_NEWER=${UV_EXCLUDE_NEWER:-$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')}" >> $GITHUB_ENV
       - name: Install just
         run: uv tool install rust-just
       - name: Install dependencies
@@ -206,7 +206,7 @@ jobs:
           enable-cache: true
           python-version: "${{matrix.python}}"
       - name: Set UV_EXCLUDE_NEWER
-        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
+        run: echo "UV_EXCLUDE_NEWER=${UV_EXCLUDE_NEWER:-$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')}" >> $GITHUB_ENV
       - name: Install just
         run: uv tool install rust-just
       - name: Install dependencies
@@ -229,7 +229,7 @@ jobs:
           enable-cache: true
           python-version: "3.10"
       - name: Set UV_EXCLUDE_NEWER
-        run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
+        run: echo "UV_EXCLUDE_NEWER=${UV_EXCLUDE_NEWER:-$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')}" >> $GITHUB_ENV
       - name: Install just
         run: uv tool install rust-just
       - name: Install dependencies
@@ -320,7 +320,7 @@ jobs:
           with:
             python-version: "3.9"
         - name: Set UV_EXCLUDE_NEWER
-          run: echo "UV_EXCLUDE_NEWER=$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
+          run: echo "UV_EXCLUDE_NEWER=${UV_EXCLUDE_NEWER:-$(date -u -d '7 days ago' '+%Y-%m-%dT%H:%M:%SZ')}" >> $GITHUB_ENV
         - id: setup-mongodb
           uses: mongodb-labs/drivers-evergreen-tools@master
           with: