helloworld SR: redirect output to log.

Also improve overall quality.
(cherry picked from commit 7232c1e3409b65790d98d44467e4ef3739940478)

software/helloworld/instance.cfg.in

@@ -45,7 +45,9 @@ configuration.name = John Doe
 # Create all needed directories, depending on your needs
 [directory]
 recipe = slapos.cookbook:mkdirectory
-etc = $${buildout:directory}/etc
+home = $${buildout:directory}
+etc = $${:home}/etc
+var = $${:home}/var
 # Executables put here will be started but not monitored (for startup scripts)
 script = $${:etc}/run/
 # Executables put here will be started and monitored (for daemons)
@@ -53,7 +55,8 @@ service = $${:etc}/service
 # Executables put here will be launched after buildout has completed to see
 # if instance is running
 promise = $${:etc}/promise/
-
+# Path of the log directory used by our service (see [hello-world])
+log = $${:var}/log
 
 # Create a simple shell script that will only output your name if you
 # specified it as instance parameter.
@@ -62,9 +65,11 @@ promise = $${:etc}/promise/
 # This recipe will try to "exec" the command-line after separating parameters.
 recipe = slapos.cookbook:wrapper
 # Notice that there is only one $ at ${dash:location}, it is because it comes from the Software Release buildout profile.
-command-line = ${dash:location}/bin/dash -c 'echo "Hello $${instance-parameter:configuration.name}!"; sleep 100000;' 
+command-line = ${dash:location}/bin/dash -c 'echo "Hello $${instance-parameter:configuration.name}, it is $(date)." > $${directory:log}/log.log; sleep 1000000;'
 # Put this shell script in the "etc/service" directory. Every executable of this
-# repository will be started and monitored by supervisord
+# repository will be started and monitored by supervisord. If one service
+# exits/crashes, it will trigger a "bang" and cause run of slapgrid for the
+# instance.
 wrapper-path = $${directory:service}/hello-world
 
 

software/helloworld/software.cfg

@@ -26,5 +26,5 @@ recipe = slapos.recipe.template
 url = ${:_profile_base_location_}/instance.cfg.in
 output = ${buildout:directory}/instance.cfg
 # MD5 checksum can be skipped for development (easier to develop), but must be filled for production
-md5sum = 1fc461c00e86485bee77a942f39e3c43
+md5sum = ed94ac99ae1e596c0da5350da6ab6f52
 mode = 0644