[GNUnet-SVN] [taler-exchange] branch master updated: configuration section in manual

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     new b6f6e42  configuration section in manual
b6f6e42 is described below

commit b6f6e429e8f5feafd8c118f4d8511110e496d497
Author: Marcello Stanisci <address@hidden>
AuthorDate: Tue May 30 17:20:44 2017 +0200

    configuration section in manual
---
 doc/taler-exchange.texi | 62 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/doc/taler-exchange.texi b/doc/taler-exchange.texi
index 161d1c8..51737bf 100644
--- a/doc/taler-exchange.texi
+++ b/doc/taler-exchange.texi
@@ -644,6 +644,68 @@ key will get a starting time of @cite{t}, and the 
@cite{j}-th key will
 get a starting time of @cite{x + duration_withdraw}, where @cite{x} is
 the starting time of the @cite{(j-1)}-th key.
 
address@hidden Configuration in Taler
+
+In Taler realm, any component obeys to the same pattern to get configuration
+values.  According to this pattern, once the component has been installed, the
+installation deploys default values in 
@address@hidden@}/share/taler/config.d/}, in
address@hidden files.  In order to override these defaults, the user can write 
a custom
address@hidden file and either pass it to the component at execution time, or 
name it
address@hidden and place it under @code{$HOME/.config/}.
+
+A config file is a text file containing `sections`, and each section contains
+its `values`. The right format follows::
+
address@hidden
+[section1]
+value1 = string
+value2 = 23
+
+[section2]
+value21 = string
+value22 = /path22
address@hidden smallexample
+
+Throughout any configuration file, it is possible to use @emph{$}-prefixed 
variables,
+like @code{$VAR}, especially when they represent filesystem paths.
+It is also possible to provide defaults values for those variables that are 
unset,
+by using the following syntax: @address@hidden:address@hidden
+However, there are two ways a user can set @emph{$}-prefixable variables:
+
+by defining them under a @code{[paths]} section, see example below,
+
address@hidden
+[paths]
+TALER_DEPLOYMENT_SHARED = ${HOME}/shared-data
+..
+[section-x]
+path-x = ${TALER_DEPLOYMENT_SHARED}/x
address@hidden smallexample
+
+or by setting them in the environment
+  
address@hidden
+$ export VAR=/x
address@hidden smallexample
+
+The configuration loader will give precedence to variables set under 
@code{[path]},
+though.
+
+The utility @code{taler-config}, which gets installed along with the exchange,
+serves to get and set configuration values without directly editing the 
@emph{.conf}.
+The option @code{-f} is particularly useful to resolve pathnames, when they use
+several levels of @emph{$}-expanded variables. See @code{taler-config --help}.
+
+Note that, in this stage of development, the file 
@code{$HOME/.config/taler.conf}
+can contain sections for @emph{all} the component. For example, both an 
exchange and
+a bank can read values from it.
+
+The repository @emph{git://taler.net/deployment} contains examples of 
configuration
+file used in our demos. See under @code{deployment/config}.
+
+Expectably, some components will not work just by using default values, as 
their
+work is often interdependent. For example, a merchant needs to know an exchange
+URL, or a database name.
 
 
 @node Deployment

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