Docker: show welcome page on port 80 when entrypoint.d is empty.

The entrypoint script now performs a default configuration when no useful
files are found in /docker-entrypoint.d/

The default configuration serves a welcome page in response to all
requests, using Markdown unless text/html is sent in the Accept header.

This provides a useful 'hello world' experience when running a Unit
container for the first time.

1 files changed, 35 insertions, 32 deletions

diff --git a/pkg/docker/docker-entrypoint.sh b/pkg/docker/docker-entrypoint.sh
index c670c2e6..4646409f 100755
--- a/pkg/docker/docker-entrypoint.sh
+++ b/pkg/docker/docker-entrypoint.sh
@@ -25,21 +25,23 @@ if [ "$1" = "unitd" ] || [ "$1" = "unitd-debug" ]; then
     if /usr/bin/find "/var/lib/unit/" -mindepth 1 -print -quit 2>/dev/null | /bin/grep -q .; then
         echo "$0: /var/lib/unit/ is not empty, skipping initial configuration..."
     else
-        if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -print -quit 2>/dev/null | /bin/grep -q .; then
-            echo "$0: /docker-entrypoint.d/ is not empty, launching Unit daemon to perform initial configuration..."
-            /usr/sbin/$1 --control unix:/var/run/control.unit.sock
+        echo "$0: Launching Unit daemon to perform initial configuration..."
+        /usr/sbin/$1 --control unix:/var/run/control.unit.sock
 
-            for i in $(/usr/bin/seq $WAITLOOPS); do
-                if [ ! -S /var/run/control.unit.sock ]; then
-                    echo "$0: Waiting for control socket to be created..."
-                    /bin/sleep $SLEEPSEC
-                else
-                    break
-                fi
-            done
-            # even when the control socket exists, it does not mean unit has finished initialisation
-            # this curl call will get a reply once unit is fully launched
-            /usr/bin/curl -f -s -X GET --unix-socket /var/run/control.unit.sock http://localhost/
+        for i in $(/usr/bin/seq $WAITLOOPS); do
+            if [ ! -S /var/run/control.unit.sock ]; then
+                echo "$0: Waiting for control socket to be created..."
+                /bin/sleep $SLEEPSEC
+            else
+                break
+            fi
+        done
+        # even when the control socket exists, it does not mean unit has finished initialisation
+        # this curl call will get a reply once unit is fully launched
+        /usr/bin/curl -s -X GET --unix-socket /var/run/control.unit.sock http://localhost/
+
+        if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -print -quit 2>/dev/null | /bin/grep -q .; then
+            echo "$0: /docker-entrypoint.d/ is not empty, applying initial configuration..."
 
             echo "$0: Looking for certificate bundles in /docker-entrypoint.d/..."
             for f in $(/usr/bin/find /docker-entrypoint.d/ -type f -name "*.pem"); do
@@ -69,29 +71,30 @@ if [ "$1" = "unitd" ] || [ "$1" = "unitd-debug" ]; then
             for f in $(/usr/bin/find /docker-entrypoint.d/ -type f -not -name "*.sh" -not -name "*.json" -not -name "*.pem" -not -name "*.js"); do
                 echo "$0: Ignoring $f";
             done
+        else
+            echo "$0: /docker-entrypoint.d/ is empty, creating 'welcome' configuration..."
+            curl_put /usr/share/unit/welcome/welcome.json "config"
+        fi
 
-            echo "$0: Stopping Unit daemon after initial configuration..."
-            kill -TERM $(/bin/cat /var/run/unit.pid)
+        echo "$0: Stopping Unit daemon after initial configuration..."
+        kill -TERM $(/bin/cat /var/run/unit.pid)
 
-            for i in $(/usr/bin/seq $WAITLOOPS); do
-                if [ -S /var/run/control.unit.sock ]; then
-                    echo "$0: Waiting for control socket to be removed..."
-                    /bin/sleep $SLEEPSEC
-                else
-                    break
-                fi
-            done
+        for i in $(/usr/bin/seq $WAITLOOPS); do
             if [ -S /var/run/control.unit.sock ]; then
-                kill -KILL $(/bin/cat /var/run/unit.pid)
-                rm -f /var/run/control.unit.sock
+                echo "$0: Waiting for control socket to be removed..."
+                /bin/sleep $SLEEPSEC
+            else
+                break
             fi
-
-            echo
-            echo "$0: Unit initial configuration complete; ready for start up..."
-            echo
-        else
-            echo "$0: /docker-entrypoint.d/ is empty, skipping initial configuration..."
+        done
+        if [ -S /var/run/control.unit.sock ]; then
+            kill -KILL $(/bin/cat /var/run/unit.pid)
+            rm -f /var/run/control.unit.sock
         fi
+
+        echo
+        echo "$0: Unit initial configuration complete; ready for start up..."
+        echo
     fi
 fi