ReadTheDocs CI builds updates

Since RTD doesn't run autogen, configure, or make, we now have to
manually copy a few RST files from the embedded PRRTE to the docs/
tree before RTD invokes Sphinx.

Signed-off-by: Jeff Squyres <[email protected]>

.readthedocs-pre-create-environment.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+set -euxo pipefail
+
+# The ReadTheDocs build process does not run autogen/configure/make.
+# Hence, we have to copy the PRRTE RST files (from the 3rd-party/prrte
+# tree) to our docs/ tree manually.
+
+# Ensure that we're in the RTD CI environment
+
+if [[ "${READTHEDOCS:-no}" == "no" ]]; then
+    echo "This script is only intended to be run in the ReadTheDocs CI environment"
+    exit 1
+fi
+
+SCHIZO_SRC_DIR=3rd-party/prrte/src/mca/schizo/ompi
+SCHIZO_TARGET_DIR=docs/schizo-ompi-rst-content
+
+PRRTE_RST_SRC_DIR=3rd-party/prrte/src/docs/prrte-rst-content
+PRRTE_RST_TARGET_DIR=docs/prrte-rst-content
+
+# Copy the OMPI schizo file from PRRTE
+
+cp -rp $SCHIZO_SRC_DIR $SCHIZO_TARGET_DIR
+
+# Only copy the PRRTE RST source files in prrte-rst-content that are
+# referenced by ".. include::" in the schizo-ompi-cli.rst file.  We do
+# this because Sphinx complains if there are .rst files that are not
+# referenced.  :-(
+
+mkdir -p $PRRTE_RST_TARGET_DIR
+files=`fgrep '.. include::' $SCHIZO_TARGET_DIR/schizo-ompi-cli.rst | awk '{ print $3 }'`
+for file in $files; do
+    filename=`basename $file`
+    cp -pf $PRRTE_RST_SRC_DIR/$filename $PRRTE_RST_TARGET_DIR
+done

.readthedocs.yaml

@@ -12,6 +12,11 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.10"
+  jobs:
+    # RTD doesn't run configure or make.  So we have to manually copy
+    # in the PRRTE RST files to docs/.
+    pre_create_environment:
+      - ./.readthedocs-pre-create-environment.sh
 
 python:
   install:
@@ -21,3 +26,6 @@ python:
 sphinx:
   configuration: docs/conf.py
   fail_on_warning: true
+
+submodules:
+  include: all