From: Justin Pryzby <pryzbyj@telsasoft.com>
Date: Sat, 26 Feb 2022 19:39:10 -0600
Subject: [PATCH 18/19] cirrus: upload changed html docs as artifacts

This could be done on the client side (cfbot).  One advantage of doing it here
is that fewer docs are uploaded - many patches won't upload docs at all.

https://cirrus-ci.com/task/5396696388599808

ci-os-only: html
---
 .cirrus.yml                    | 19 +++++++++++++++++--
 src/tools/ci/copy-changed-docs | 23 +++++++++++++++++++++++
 2 files changed, 40 insertions(+), 2 deletions(-)
 create mode 100755 src/tools/ci/copy-changed-docs

diff --git a/.cirrus.yml b/.cirrus.yml
index d5ba9e459e9..e3347608aa9 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -633,7 +633,7 @@ task:
 
 
 ###
-# Verify docs can be built
+# Verify docs can be built, and (only on cfbot) upload changed docs as artifacts
 ###
 
 task:
@@ -644,7 +644,7 @@ task:
     BUILD_JOBS: 1
 
   only_if: $CIRRUS_CHANGE_MESSAGE !=~ '.*\nci-os-only:.*' || $CIRRUS_CHANGE_MESSAGE =~ '.*\nci-os-only:[^\n]*(docs|html).*'
-  skip: "!changesInclude('.cirrus.yml', 'doc/**')"
+  #skip: "!changesInclude('.cirrus.yml', 'doc/**', 'src/tools/ci/copy-changed-docs')"
 
   container:
     image: $CONTAINER_REPO/linux_debian_bullseye_ci:latest
@@ -657,8 +657,23 @@ task:
     cat /proc/cmdline
     ulimit -a -H && ulimit -a -S
     export
+    git diff --name-only "$BASE_COMMIT"
 
   # Exercise HTML and other docs:
   docs_build_script: |
     time ./configure
     make -s -j${BUILD_JOBS} -C doc
+    cp -r doc new-docs
+
+    # Build HTML docs from the base commit.
+    git checkout "$BASE_COMMIT" -- doc
+    #html-stamp
+    make -s -C doc clean
+    make -s -C doc html
+    cp -r doc old-docs
+
+  copy_changed_docs_script: |
+    src/tools/ci/copy-changed-docs "old-docs" "new-docs" "html_docs"
+
+  html_docs_artifacts:
+    paths: ['html_docs/*.html', 'html_docs/*.png', 'html_docs/*.css']
diff --git a/src/tools/ci/copy-changed-docs b/src/tools/ci/copy-changed-docs
new file mode 100755
index 00000000000..1584f974d94
--- /dev/null
+++ b/src/tools/ci/copy-changed-docs
@@ -0,0 +1,23 @@
+#! /bin/sh
+# Copy HTML which differ between $old and $new into $outdir
+set -e
+
+old=$1
+new=$2
+outdir=$3
+
+mkdir "$outdir"
+cp "$new"/src/sgml/html/*.css "$new"/src/sgml/html/*.svg "$outdir"
+
+changed=`git diff --no-index --name-only "$old"/src/sgml/html "$new"/src/sgml/html` ||
+	[ $? -eq 1 ]
+
+for f in $changed
+do
+	# Avoid removed files
+	[ -f "$f" ] || continue
+
+	cp -v "$f" "$outdir"
+done
+
+exit 0
-- 
2.17.1


--Sw7tCqrGA+HQ0/zt
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