Taught build host setup script how to use cf-remote or source to get cf-agent

For new platforms/archictures where quickinstall script doesn't work let's try:

1) cf-remote --version master install (in case nightlies are available)
2) build from source (limited support so far in core)

Ticket: ENT-13016
Changelog: none

Author: craigcomstock

ci/setup-cfengine-build-host.sh

@@ -56,8 +56,12 @@ chown -R jenkins /home/jenkins
 
 echo "checking for CFEngine install..."
 if [ -d /var/cfengine ]; then
-  echo "Error: CFEngine already installed on this host. Will not proceed trying to setup build host with CFEngine temporary install."
-  exit 1
+  echo "Found CFEngine install at /var/cfengine"
+  if ! /var/cfengine/bin/cf-agent -V; then
+    echo "Failed to run cf-agent -V, will exit."
+    exit 1
+  fi
+  echo "Found working cf-agent. Will proceed."
 fi
 
 function cleanup()
@@ -116,17 +120,21 @@ cd ..
 echo "Install any distribution upgrades"
 if [ -f /etc/os-release ]; then
   if grep rhel /etc/os-release; then
-    yum upgrade --assumeyes
+    yum update --assumeyes
+    alias software='yum install --assumeyes'
   elif grep debian /etc/os-release; then
     DEBIAN_FRONTEND=noninteractive apt upgrade --yes && DEBIAN_FRONTEND=noninteractive apt autoremove --yes
+    alias software='DEBIAN_FRONTEND=noninteractive apt install --yes'
   elif grep suse /etc/os-release; then
     zypper -n update
+    alias software='zypper install -y'
   else
     echo "Unknown platform ID $ID. Need this information in order to update/upgrade distribution packages."
     exit 1
   fi
 elif [ -f /etc/redhat-release ]; then
-  yum upgrade --assumeyes
+  yum update --assumeyes
+  alias software='yum install --assumeyes'
 else
   echo "No /etc/os-release or /etc/redhat-release so cant determine platform."
   exit 1
@@ -168,6 +176,27 @@ else
   bash ./quick-install-cfengine-enterprise.sh agent
 fi
 
+# if cf-agent not installed, try cf-remote --version master
+if [ ! -x /var/cfengine/bin/cf-agent ]; then
+  echo "quick install didn't install cf-agent, try cf-remote"
+  # could try pipx or various package names for different distributions, or uv
+  if software pipx; then
+    pipx install cf-remote
+    cf-remote --version master install --client localhost
+  fi
+fi
+
+if [ ! -x /var/cfengine/bin/cf-agent ]; then
+  echo "quickinstall and cf-remote didn't install cf-agent, try from source"
+  CFE_VERSION=3.26.0 # need to use an actualy release which has a checksum for masterfiles download
+  rm -rf core # just in case we are repeating the script
+  git clone --recursive --depth 1 https://github.com/cfengine/core
+  (
+    cd core
+    ./ci/install.sh
+  )
+fi
+
 # get masterfiles
 urlget https://cfengine-package-repos.s3.amazonaws.com/enterprise/Enterprise-"$CFE_VERSION"/misc/cfengine-masterfiles-"$CFE_VERSION"-1.pkg.tar.gz