Hi William.
On 06/03/11 01:44, William Schumann wrote:
In order to provide more than one name service in the text
installer/SCI tool, proposing modifications to the UI. Please review
and comment on this rough draft.
Change name service selection screen, (which presently allows the user
to choose only one among DNS, LDAP, NIS, or None):
offer check boxes instead of a single selection. The user will be
subsequently prompted for configuration of whichever name services
were checked.
Sounds good.
Add another screen after all name service-specific prompting for the
user to enter name service sources, per nsswitch.conf(4).
UI - 1st pass - offer defaults based on the combination of name
services selected.
Allow the user to change the sources and remember them as long as the
name service selections don't change.
If the user uses F3 and goes back and changes name services, upon
return to the sources screen, there is an additional message to remind
the user that it may be appropriate to alter sources.
The source screen will have two columns for database and source. e.g.
for DNS, the source screen default could be (rough example):
Name Service Database Sources
You have selected name service: DNS. Enter the name service switch
database and source information.
Database Source
---------- --------
default files
hosts files dns mdns
printer user files
[blank] [blank]
I like the idea of displaying in two columns. That said, I prefer not
having the user type the sources.
There are two things to account for in accepting an entry: that only
configured sources are entered, and (if nsswitch functionality is
followed completely) what happens when a requested database entry is not
found, or the source is busy or not responding.
(For example, "nis [NOTFOUND=return] files".)
One possible solution is to provide a radio button next to each row in
the source screen table, which, when clicked, brings up another window.
In the new window is a table where each configured source can be
ordered. This can be a place to assign a numeric value to each source,
or using +- keys to shift the order (a la bios setups for boot devices),
or some other means.
Each source would also have a way of configuring NOTFOUND or TRYAGAIN
handling. A possible implementation would be an initial menu which has
NOTFOUND and TRYAGAIN, and submenus containing "return"; "continue"; and
for TRYAGAIN, "forever" and a way to enter a numeric value. The
default would be "NOTFOUND=continue".
Also, just shooting the moon here, if a source set up by these menus is
later unconfigured, it would subsequently show up in these menus as red,
or grayed out, to indicate it is invalid, calling it out as requiring
change.
Thanks,
Jack
...
[additional message here]
Additional messages may include:
-A default list of databases and sources are provided above. You may
edit them, or accept the defaults.
-Note: since the name service was changed, consider changing sources
accordingly.
The UI field validator for sources would permit only known sources and
source values per nsswitch.conf(4)
Thank you for your attention,
William
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