SeleniumHQ · titusfortner · Jan 24, 2026 · Jan 21, 2026 · Jan 24, 2026 · Jan 24, 2026
diff --git a/.github/workflows/bazel.yml b/.github/workflows/bazel.yml
@@ -67,10 +67,10 @@ on:
         type: boolean
         default: false
       fetch-depth:
-        description: Number of commits to fetch (0 for full history)
+        description: Number of commits to fetch (0 for full history, empty for auto-detect)
         required: false
-        type: number
-        default: 1
+        type: string
+        default: ''
       cache-name:
         description: Name for cache restore (restores {name}.gz with key {name}-)
         required: false
@@ -90,11 +90,31 @@ jobs:
       NUGET_API_KEY: ${{ secrets.NUGET_API_KEY }}
       NODE_AUTH_TOKEN: ${{ secrets.NODE_AUTH_TOKEN }}
     steps:
+      - name: Calculate fetch depth
+        id: depth
+        env:
+          FETCH_DEPTH: ${{ inputs.fetch-depth }}
+          PR_COMMITS: ${{ github.event.pull_request.commits }}
+        run: |
+          # Use explicit value if provided
+          if [ -n "$FETCH_DEPTH" ]; then
+            echo "val=$FETCH_DEPTH" >> "$GITHUB_OUTPUT"
+          # For PRs, use commit count plus buffer for merge base
+          elif [ -n "$PR_COMMITS" ]; then
+            echo "val=$((PR_COMMITS + 2))" >> "$GITHUB_OUTPUT"
+          # For push events, read commit count from event payload
+          else
+            COMMIT_COUNT=$(jq -e '.commits | length // 0' "$GITHUB_EVENT_PATH" 2>/dev/null) || COMMIT_COUNT=0
+            echo "val=$((COMMIT_COUNT + 1))" >> "$GITHUB_OUTPUT"
+          fi
       - name: Checkout source tree
         uses: actions/checkout@v4
         with:
           ref: ${{ inputs.ref || github.ref }}
-          fetch-depth: ${{ inputs.fetch-depth }}
+          fetch-depth: ${{ steps.depth.outputs.val }}
+      - name: Fetch base ref for PR comparison
+        if: github.event.pull_request.base.sha
+        run: git fetch --depth=1 origin ${{ github.event.pull_request.base.sha }}
       - name: Pull latest changes from head ref for PRs
         if: contains(github.head_ref, 'renovate/')
         run: git pull origin "$HEAD_REF"

diff --git a/.github/workflows/ci-grid-ui.yml b/.github/workflows/ci-grid-ui.yml
@@ -22,8 +22,6 @@ jobs:
     steps:
       - name: Checkout source tree
         uses: actions/checkout@v4
-        with:
-          fetch-depth: 50
 
       - name: Setup Node.js
         uses: actions/setup-node@v4

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -32,7 +32,6 @@ jobs:
     with:
       name: Check Targets
       cache-name: bazel-test-target-index
-      fetch-depth: 50
       run: |
         if [ "${{ github.event_name }}" == "schedule" ] || \
         [ "${{ github.event_name }}" == "workflow_call" ] || \

diff --git a/.github/workflows/mirror-selenium-releases.yml b/.github/workflows/mirror-selenium-releases.yml
@@ -17,7 +17,6 @@ jobs:
     - uses: actions/checkout@v4
       with:
         persist-credentials: false
-        fetch-depth: 0
     - name: Read api.github.com and filter response
       run: |
         set -euo pipefail

diff --git a/.github/workflows/pre-release.yml b/.github/workflows/pre-release.yml
@@ -137,14 +137,56 @@ jobs:
       run: ./go all:version ${{ needs.normalize-version.outputs.version }}
       artifact-name: patch-versions
 
+  calculate-changelog-depth:
+    name: Calculate Changelog Depth
+    needs: normalize-version
+    runs-on: ubuntu-latest
+    outputs:
+      depth: ${{ steps.calc.outputs.depth }}
+    steps:
+      - name: Calculate fetch depth from tag
+        id: calc
+        env:
+          GH_TOKEN: ${{ github.token }}
+          VERSION: ${{ needs.normalize-version.outputs.version }}
+        run: |
+          set -euo pipefail
+          if [[ "$VERSION" =~ ([0-9]+)\.([0-9]+)\.([0-9]+) ]]; then
+            MAJOR=${BASH_REMATCH[1]}
+            MINOR=${BASH_REMATCH[2]}
+            PATCH=${BASH_REMATCH[3]}
+
+            if [ "$PATCH" -gt 1 ]; then
+              PREV="selenium-${MAJOR}.${MINOR}.$((PATCH-1))"
+            elif [ "$PATCH" -eq 1 ]; then
+              PREV="selenium-${MAJOR}.${MINOR}.0"
+            elif [ "$MINOR" -gt 0 ]; then
+              PREV="selenium-${MAJOR}.$((MINOR-1)).0"
+            else
+              # First release of major version (X.0.0), use full history
+              echo "depth=0" >> "$GITHUB_OUTPUT"
+              exit 0
+            fi
+
+            COUNT=$(gh api "repos/${{ github.repository }}/compare/${PREV}...${{ github.sha }}" --jq '.total_commits' 2>/dev/null) || {
+              echo "::warning::Failed to get commit count, using full history"
+              echo "depth=0" >> "$GITHUB_OUTPUT"
+              exit 0
+            }
+            echo "depth=$((COUNT + 1))" >> "$GITHUB_OUTPUT"
+          else
+            echo "depth=0" >> "$GITHUB_OUTPUT"
+          fi
+
   generate-changelogs:
     name: Generate Changelogs
-    needs: [restrict-trunk, normalize-version]
+    needs: [restrict-trunk, normalize-version, calculate-changelog-depth]
     uses: ./.github/workflows/bazel.yml
     with:
       name: Update Changelogs
       run: ./go all:changelogs && ./go rust:changelogs
       artifact-name: patch-changelogs
+      fetch-depth: ${{ needs.calculate-changelog-depth.outputs.depth }}
 
   create-pr:
     name: Create Pull Request
@@ -156,7 +198,6 @@ jobs:
         with:
           token: ${{ secrets.SELENIUM_CI_TOKEN }}
           ref: trunk
-          fetch-depth: 0
       - name: Get latest trunk
         run: git pull --ff-only origin trunk
       - name: Download all patches