Allow installing specific Docker-CE version

cdist/conf/type/__docker/man.rst

@@ -20,6 +20,9 @@ OPTIONAL PARAMETERS
 -------------------
 state
    'present' or 'absent', defaults to 'present'
+version
+   The specific version to install. Defaults to the special value 'latest',
+   meaning the version the package manager will install by default.
 
 
 BOOLEAN PARAMETERS
@@ -38,6 +41,8 @@ EXAMPLES
     # Remove docker
     __docker --state absent
 
+    # Install specific version
+    __docker --state present --version 18.03.0.ce
 
 AUTHORS
 -------

cdist/conf/type/__docker/manifest

@@ -21,6 +21,7 @@
 
 os=$(cat "$__global/explorer/os")
 state=$(cat "$__object/parameter/state")
+version=$(cat "$__object/parameter/version")
 
 case "$os" in
     centos)
@@ -33,7 +34,11 @@ case "$os" in
             --gpgcheck 1 \
             --gpgkey 'https://download.docker.com/linux/centos/gpg' \
             --state "${state}"
+          if [ "$version" != "latest" ]; then
+            require="__yum_repo/docker-ce-stable" __package docker-ce --version "${version}" --state "${state}"
+          else
             require="__yum_repo/docker-ce-stable" __package docker-ce --state "${state}"
+          fi
         else
           echo "CentOS version 7 is required!" >&2
           exit 1
@@ -53,7 +58,11 @@ case "$os" in
          --distribution "$(cat "$__global/explorer/lsb_codename")" \
          --state "${state}" \
          --component "stable"
+      if [ "$version" != "latest" ]; then
+        __package docker-ce --version "${version}" --state "${state}"
+      else
         __package docker-ce --state "${state}"
+      fi
       unset CDIST_ORDER_DEPENDENCY
    ;;
    *)

cdist/conf/type/__docker/parameter/default/version

@@ -0,0 +1 @@
+latest

cdist/conf/type/__docker/parameter/optional

@@ -1 +1,2 @@
 state
+version