From cc998bcae1d8018060bc2d227bf6deacee09dea1 Mon Sep 17 00:00:00 2001
From: Jeremy Phelps <jphelps@linuxfoundation.org>
Date: Thu, 3 May 2018 19:41:39 -0500
Subject: [PATCH] Add support to log into docker.io

This follows essentially the same pattern
as logging into the nexus docker registries.

Change-Id: I174c0f27d46d59ddae5abc0fda67a839095c2535
Signed-off-by: Jeremy Phelps <jphelps@linuxfoundation.org>
---
 shell/docker-login.sh | 57 ++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 43 insertions(+), 14 deletions(-)

diff --git a/shell/docker-login.sh b/shell/docker-login.sh
index 92da7e0d..cac51867 100644
--- a/shell/docker-login.sh
+++ b/shell/docker-login.sh
@@ -22,19 +22,36 @@
 #                    Listing of all the registry ports to login to
 #                    ex: 10001 10002 10003 10004
 #
+# $DOCKERHUB_REGISTRY: Optional
+#                      Set global Jenkins variable to `docker.io`
+#                      Additionally you will need to add as an entry
+#                      to your projects mvn-settings file with username
+#                      and password creds.  If you are using docker version
+#                      < 17.06.0 you will need to set DOCKERHUB_EMAIL
+#                      to auth to docker.io
+#
 # $SETTINGS_FILE   : Job level variable with maven settings file location
 #
 # $DOCKERHUB_EMAIL : Optional
 #                    Jenkins global variable that defines the email address that
 #                    should be used for logging into DockerHub
-#                    If defined than an attempt to login to docker hub will
-#                    happen
+#                    Note that this will not be used if you are using
+#                    docker version >=17.06.0.
+
+#So here are the cases in docker login
+#1) User logging into nexus no email required regardless of docker version
+#2) User logging into docker.io with docker version <17.06.0  email optional
+#3) User logging into docker.io wiht docker version >= 17.06.0 cannot use email flag
+
 
 # Ensure we fail the job if any steps fail
 set -eu -o pipefail
 
-# Execute the credential lookup and login to the registry
-do_login() {
+#Check if current version less than desired version
+version_lt() { test "$(echo "$@" | tr " " "\n" | sort -rV | head -n 1)" != "$1"; }
+
+# Execute the credential lookup and set
+set_creds() {
     set +x  # Ensure that no other scripts add `set -x` and print passwords
     echo "$1"
     CREDENTIAL=$(xmlstarlet sel -N "x=http://maven.apache.org/SETTINGS/1.0.0" \
@@ -57,13 +74,14 @@ do_login() {
         return 1
     fi
 
-    docker_version=$(docker -v | awk '{print $3}')
-    compare_value=$(echo "17.06.0 $docker_version" | \
-                    tr " " "\n" | \
-                    sort -V | \
-                    sed -n 1p)
-    if [[ "$docker_version" == "$compare_value" && \
-          "$docker_version" != "17.06.0" ]]
+}
+
+# Login to the registry
+do_login() {
+    docker_version=$( docker -v | awk '{print $3}')
+    if version_lt $docker_version "17.06.0" && \
+       "$DOCKERHUB_REGISTRY" == "docker.io" && \
+       "$DOCKERHUB_EMAIL:-none" != 'none'
     then
         docker login -u "$USER" -p "$PASS" -e "$2" "$1"
     else
@@ -71,6 +89,10 @@ do_login() {
     fi
 }
 
+
+### Main ###
+
+# Loop through Registry and Ports to concatentate and login to nexus
 if [ "${DOCKER_REGISTRY:-none}" != 'none' ]
 then
     for PORT in $REGISTRY_PORTS
@@ -79,12 +101,19 @@ then
 
         # docker login requests an email address if nothing is passed to it
         # Nexus, however, does not need this and ignores the value
+        set_creds $REGISTRY
         do_login "$REGISTRY" none
     done
 fi
 
-# Attempt to login to docker.io only if $DOCKERHUB_EMAIL is configured
-if [ "${DOCKERHUB_EMAIL:-none}" != 'none' ]
+# Login to docker.io after determining if email is needed.
+if [ "${DOCKERHUB_REGISTRY:-none}" != 'none' ]
 then
-    do_login docker.io "$DOCKERHUB_EMAIL"
+    set_creds $DOCKERHUB_REGISTRY
+    if [ "${DOCKERHUB_EMAIL:-none}" != 'none' ]
+    then
+        do_login "$DOCKERHUB_REGISTRY" "$DOCKERHUB_EMAIL"
+    else
+        do_login "$DOCKERHUB_REGISTRY" none
+    fi
 fi
-- 
2.16.6