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As of this writing, the entries for OverrideFirstRunPage and
OverridePostUpdatePage in
https://github.com/mozilla/policy-templates/blob/master/README.md refer
to the possibility of setting a policy to a blank value, with a
different effect from setting it to a defined value.
For example, OverrideFirstRunPage says that "If the value is blank, no
first run page is displayed.".
However, no example of how to set this to a blank value is given. For
some of the policy provisioning methods listed, how to set the value to
blank is relatively clear from the general ways to set values in that
method in the first place, but for others it is not. In particular, for
the policies.json case, I'm not clear whether the correct way to set a
blank value would be
"OverrideFirstRunPage": "",
"OverrideFirstRunPage": {},
"OverrideFirstRunPage": '""',
"OverrideFirstRunPage": ,
or something else. (There are quite a few examples given in various
question-and-answer places online for how to set an empty or blank or
NULL value in JSON, some but not all of which are in the above list, and
none of them seem obviously the right choice to use here.)
Rather than flail around testing things at random till I find the
correct syntax, I thought I'd ask: what is the proper way to specify
blank values in policies.json?
Additionally, as a tangential point, these entries do not explain what
*is* done instead of displaying the first-run or post-update page if the
value is blank.
It seems intuitive that if a URL is specified for either of these, that
page will be displayed at the relevant time instead of the built-in
default. If the value is blank, I can guess that maybe it will display
the defined home page instead, or the new-tab page, or about:blank, or
(for upgrade) the last set of open tabs - or maybe that the page in
question is always shown in a separate tab, in addition to whatever
other tabs may appear, and that that extra tab will simply not be
opened. However, nothing here tells me which one (if indeed it's any of
those), so I can't decide what value to set this to without testing that
behavior.
A brief indication of what the behavior here will be - e.g., if it's the
"separate tab" alternative, something like "If the value is blank, no
first-run-page tab will be opened." - would be helpful to the
uninitiated reader.
- --
Andrew J. Buehler
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