Fix #518: Use redhat-docker intaller

rsconf/package_data/docker/main.sh.jinja

@@ -1,74 +1,33 @@
 #!/bin/bash
 _docker_pkg=docker-ce
 
-docker_install() {
-    if [[ -e /var/lib/docker ]]; then
-        # This will happen on dev systems only, but a good check nonetheless
-        install_err '/var/lib/docker exists. You need to:
-systemctl stop docker
-systemctl disable docker
-rm -rf /var/lib/docker/*
-umount /var/lib/docker
-rmdir /var/lib/docker
-perl -pi -e "s{^/var/lib/docker.*}{}" /etc/fstab
-lvremove -f /dev/mapper/docker-vps
-
-Then re-run rsconf. This should only happen in development environments.
-'
-    fi
-    if rsconf_fedora_release_if 26; then
-        # https://docs.docker.com/engine/installation/linux/docker-ce/fedora/#set-up-the-repository
-        dnf -y install dnf-plugins-core
-        dnf config-manager \
-            --add-repo \
-            https://download.docker.com/linux/fedora/"$_docker_pkg".repo
-    else
-        yum-config-manager \
-            --add-repo https://download.docker.com/linux/centos/"$_docker_pkg".repo
-        yum makecache fast
-        # yum-plugin-ovl required for overlay2 on centos7
-        # https://github.com/docker-library/official-images/issues/1291
-        rsconf_yum_install yum-plugin-ovl
-    fi
-    rsconf_yum_install "$_docker_pkg"
-    {% if rsconf_db.channel == "dev" %}
-        # Give vagrant user access in dev mode only
-        usermod -aG docker vagrant
-    {% endif %}
-}
-
 docker_main() {
     declare d={{ docker.data_d }}/volumes
     if [[ -e $d ]] && type docker >& /dev/null; then
-        if docker_need_update; then
+        if docker_up_to_date; then
+            install_info "$d: exists, docker already installed"
+        else
             # Need to specify cli explicitly or it won't update
             install_yum update "$_docker_pkg" "$_docker_pkg"-cli
-        else
-            install_info "$d: exists, docker already installed"
         fi
     else
-        docker_install
+        rsconf_radia_run_as_user root redhat-docker
     fi
-    if docker_need_update; then
+    if ! docker_up_to_date; then
         install_err "Installed docker=$(docker_version) is < min_software_version={{ docker.min_software_version }} after install."
     fi
 }
 
-docker_need_update() {
-    local v=$(docker_version)
+docker_up_to_date() {
+    declare v=$(docker_version)
     if [[ ! $v ]]; then
         install_err "docker --version did not output a valid version number"
     fi
-    (( $(docker_version_num "$v" ) < $(docker_version_num '{{ docker.min_software_version }}') ))
+    printf "%s\n%s\n" '{{ docker.min_software_version }}' "$v" | sort --version-sort --check &> /dev/null
 }
 
 docker_version() {
     if [[ $(docker --version) =~ ([0-9]+\.[0-9]+\.[0-9]+) ]]; then
         echo "${BASH_REMATCH[1]}"
     fi
 }
-
-docker_version_num() {
-    declare dotted=$1
-    printf '%d%06d%06d' ${dotted//./ }
-}