Set absolute paths in 404 page

Signed-off-by: George Melikov <mail@gmelikov.ru>

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
     - uses: actions/checkout@v1
     - uses: ammaraskar/sphinx-action@master
       with:
-        pre-build-command: "apt-get update -y && apt-get install -y python3-pip && pip install -r docs/requirements.txt"
+        pre-build-command: "apt-get update -y && apt-get install -y git python3-pip && pip install -r docs/requirements.txt"
         docs-folder: "docs/"
     - name: Deploy
       uses: peaceiris/actions-gh-pages@v3

.github/workflows/pull_request.yml

@@ -9,5 +9,5 @@ jobs:
     - uses: actions/checkout@v1
     - uses: ammaraskar/sphinx-action@master
       with:
-        pre-build-command: "apt-get update -y && apt-get install -y python3-pip && pip install -r docs/requirements.txt"
+        pre-build-command: "apt-get update -y && apt-get install -y git python3-pip && pip install -r docs/requirements.txt"
         docs-folder: "docs/"

docs/conf.py

@@ -46,6 +46,7 @@ extensions = [
     'sphinx.ext.intersphinx',
     "sphinx_issues",
     "sphinx_rtd_theme",
+    "notfound.extension"
 ]
 
 # Add any paths that contain templates here, relative to this directory.
@@ -214,3 +215,7 @@ issues_github_path = "openzfs/zfs"
 issues_uri = "https://github.com/openzfs/zfs/issues/{issue}"
 issues_pr_uri = "https://github.com/openzfs/zfs/pull/{pr}"
 issues_commit_uri = "https://github.com/openzfs/zfs/commit/{commit}"
+
+# Get absolute paths in 404
+notfound_no_urls_prefix = True
+notfound_url_prefix = '/openzfs-docs'

docs/requirements.txt

@@ -1,3 +1,5 @@
 Sphinx
 sphinx-issues
+# sphinx-notfound-page with change for Github Pages https://github.com/readthedocs/sphinx-notfound-page/pull/94
+git+https://github.com/gmelikov/sphinx-notfound-page.git@github_pages#egg=sphinx-notfound-page
 sphinx-rtd-theme