Add support for Sangoma Linux (FreePBX), CentOS-based

Based on xenserver#57

Refs xcp-ng/xcp#243

mk/install.sh

@@ -137,7 +137,7 @@ select_pkgs_rhel()
 	rhel8|centos8|oracle8|scientific8|neokylin8|cloudlinux8)
 	    # No additional kernel package
 	    ;;
-	alpine3*)
+	alpine3*|sangoma*)
 	    # No additional kernel package
 	    ;;
 	rhel3|fedora*)
@@ -513,7 +513,7 @@ install_coreos()
 case "${os_distro}" in
     rhel|centos|oracle|fedora)         select_pkgs_rhel ;;
     scientific|neokylin|asianux|turbo) select_pkgs_rhel ;;
-    alpine|cloudlinux)                 select_pkgs_rhel ;;
+    alpine|cloudlinux|sangoma)         select_pkgs_rhel ;;
     sles|"suse linux")                 select_pkgs_sles ;;
     debian|ubuntu|linx|yinhe)          select_pkgs_debian ;;
     xe-ddk|xe-sdk)                     select_pkgs_xe ;;

mk/xe-linux-distribution

@@ -361,6 +361,35 @@ identify_asianux()
     write_to_output "${distro}" "${major}" "${minor}" "$(head -n 1 ${asianux_release})"
 }
 
+identify_sangoma()
+{
+    sangoma_release="$1"
+    local distro
+    local major
+    local minor
+
+    # distro
+    # 'Sangoma Linux (FreePBX)'
+
+    if [ ! -f "${sangoma_release}" ] ; then
+	return 1
+    fi
+
+    eval $(sed -rn \
+              's/^Sangoma Linux release \([0-9]*\)\.\([0-9]*\)\(\.[0-9]*\)\? (.*)/distro=sangoma;major=\1;minor=\2/gp;' \
+              "${sangoma_release}")
+
+    if [ -z "${major}" -o -z "${distro}" ] ; then
+        return 1
+    fi
+
+    if [ -z "${minor}" ] ; then
+        minor=0
+    fi
+
+    write_to_output "${distro}" "${major}" "${minor}" "$(head -n 1 ${sangoma_release})"
+}
+
 identify_turbo()
 {
     turbo_release="$1"
@@ -509,6 +538,7 @@ if [ -z "${TEST}" ] ; then
     identify_debian /etc/debian_version && exit 0
     identify_boot2docker /etc/boot2docker && exit 0
     identify_alpine /etc/alpine-release && exit 0
+    identify_sangoma /etc/centos-release && exit 0
 
 
     if [ $# -eq 1 ] ; then