diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 95d08a2f..ddfb06ae 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -28,6 +28,9 @@
         {
           "uses": "actions/upload-pages-artifact@v3.0.1"
         },
+        {
+          "run": "./.post.sh"
+        },
         {
           "id": "deployment",
           "uses": "actions/deploy-pages@v4.0.5"
@@ -57,6 +60,9 @@
         },
         {
           "uses": "actions/upload-pages-artifact@v3.0.1"
+        },
+        {
+          "run": "./.post.sh"
         }
       ]
     }
diff --git a/.pages.sh b/.pages.sh
index aee993e8..873d09b4 100755
--- a/.pages.sh
+++ b/.pages.sh
@@ -22,6 +22,9 @@ export LC_ALL=C
 unset LANGUAGE
 
 set -o pipefail
+rm -f .post.state
+if test -h .post.state || test -e .post.state; then exit 255; fi
+state=''
 
 $sudoagi eatmydata
 sudoapt clean
@@ -40,12 +43,12 @@ eatmydata env TMPDIR=/tmp npm install
 
 (eatmydata npm run clean || :)
 eatmydata npm run build
-eatmydata npm run test
-eatmydata npm run test-min
+eatmydata npm run test || state="$state test"
+eatmydata npm run test-min || state="$state test-min"
 if [[ $GITHUB_REPOSITORY = danvk/dygraphs ]]; then
-	eatmydata npm run coverage
-	eatmydata scripts/post-coverage.sh
-	eatmydata scripts/weigh-in.sh
+	eatmydata npm run coverage || state="$state coverage"
+	eatmydata scripts/post-coverage.sh || state="$state post-coverage"
+	eatmydata scripts/weigh-in.sh || state="$state weigh-in"
 fi
 
 rm -rf _site
@@ -65,3 +68,5 @@ if [[ -n $imprint_text ]]; then
 	    '
 fi
 cd ..
+set -o noglob
+echo $state >.post.state
diff --git a/.post.sh b/.post.sh
new file mode 100755
index 00000000..ea720f2a
--- /dev/null
+++ b/.post.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+echo ::group::Check whether .pages.sh failed anywhere
+state=$(cat .post.state || echo state-file-missing)
+if test -n "$state"; then
+	echo "E: .pages.sh failed in: $state"
+	exit 1
+fi
+echo "I: nope, ok"
+echo ::endgroup::
diff --git a/LICENSE.txt b/LICENSE.txt
index d2ba0d50..9e1a9526 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -10,6 +10,7 @@ Copyright (c) 2014 mirabilos <m@mirbsd.org>
 Copyright (c) 2015 Petr Shevtsov <petr.shevtsov@gmail.com>
 Copyright (c) 2022, 2023 mirabilos <t.glaser@tarent.de>
                    Deutsche Telekom LLCTO
+Copyright (c) 2025 mirabilos <tg@debian.org>
 and numerous contributors (see git log)
 
 Some tests additionally are: