install pmix if not present (#1865)

playbooks/roles/cyclecloud_cluster/projects/enroot/cluster-init/scripts/3-pmix.sh.j2

@@ -1,4 +1,29 @@
 #!/bin/bash
+set -e
+
+# Install PMIx if not present in the image
+# if the /opt/pmix/v4 directory is not present, then install PMIx
+if [ ! -d /opt/pmix/v4 ]; then
+    os_release=$(cat /etc/os-release | grep "^ID\=" | cut -d'=' -f 2 | xargs)
+    case $os_release in
+        rhel|almalinux)
+            dnf -y install autoconf flex libevent-devel git
+            ;;
+        ubuntu|debian)
+            apt-get update
+            apt-get install -y git libevent-dev libhwloc-dev autoconf flex make gcc libxml2
+            ;;
+    esac
+    # Build PMIx
+    cd /mnt/scratch
+    rm -rf openpmix
+    git clone --recursive https://github.com/openpmix/openpmix.git
+    cd openpmix
+    git checkout v4.2.9
+    ./autogen.pl
+    ./configure --prefix=/opt/pmix/v4
+    make -j install
+fi
 
 # Exit if Enroot is not in the image
 [ -d /etc/enroot ] || exit 0