Hi,
I'm wondering if there's a way to set the maximum number of fields
that edit_field will use. For example, I've written the following
bundle for setting values in a configuration file of the form "var
value" (e.g. sshd config file). It is based on set_variable_values
from stdlib, using a different separator:
# Sets the RHS of configuration items in the file of the form
# LHS RHS
# If the line is commented out with #, it gets uncommented first
# Adds a new line if non exists.
# The argument is an associative array containint v[LHS]="rhs"
# Based on set_variable_values from cfengine_stdlib.cf, modified
# by Diego Zamboni to use whitespace as separator, and to handle
# commented-out lines.
bundle edit_line set_config_values(v)
{
vars:
"index" slist => getindices("$(v)");
# Be careful if the index string contains funny chars
"cindex[$(index)]" string => canonify("$(index)");
field_edits:
# If the line is there, but commented out, first uncomment it
"#+$(index)\s+.*"
edit_field => col("\s+","1","$(index)","set");
# match a line starting like the key something
"$(index)\s+.*"
edit_field => col("\s+","2","$($(v)[$(index)])","set"),
classes => if_ok("not_$(cindex[$(index)])");
insert_lines:
"$(index) $($(v)[$(index)])",
ifvarclass => "!not_$(cindex[$(index)])";
}
The problem with this is that edit_field is splitting on whitespace,
so if the RHS contains spaces, only the first non-space sequence will
be replaced, leaving spurious values behind. It would be nice to be
able to tell edit_field that the line contains only two fields, and to
split only at the first instance of the separator.
This can be done with replace_patterns instead of field_edits, but I
think it would be a nice feature to have. Or maybe it is there already
and I am missing something?
Thanks! BTW, I find this list immensely useful and friendly. I've only
started with cfengine a few weeks ago, but I am already getting a good
feeling for its power, and the community has been a huge help.
--Diego
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