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| -rw-r--r-- | doc/forum/Inherited_Variables....mdwn | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/doc/forum/Inherited_Variables....mdwn b/doc/forum/Inherited_Variables....mdwn new file mode 100644 index 00000000..1535ec77 --- /dev/null +++ b/doc/forum/Inherited_Variables....mdwn @@ -0,0 +1,26 @@ +I've got a server defined in config.hs as follows: + + myserver :: Host + myserver = host "myserver.mydomain" $ props + & standardSystem (Stable "jessie") X86_64 [ "Welcome to myserver!" ] + +I'm writing a module (to deploy Matrix, FWIW) which has a section like this: + + sources :: Property Debian + sources = File.hasContent "/etc/apt/sources.list.d/matrix.list" + [ "# Deployed by Propellor" + , "" + , "deb http://matrix.org/packages/debian/ jessie main" + ] `onChange` Apt.update + +What I would like to be able to do, for example, is pull "jessie" from the standardSystem line into the sources function. + +The host name is another I'd like to be able to pull in, so that I can abstract as much as possible and wind up with a line that looks not unlike this: + + & Matrix.server + +Instead of + + & Matrix.server hostname jessie + +Am I barking up the wrong tree and should I just embrace the latter? |