[wpkg-users] newbie questions
alt36 at cam.ac.uk
Tue Dec 15 13:10:28 CET 2015
> In many packages I see this line: check type="uninstall"
> condition="exists" path="filezilla" />
> The way I understand this is: Do not install, if software already exists
> on the machine. What I don't understand is on the "path" variable is
> only the software name. How does it know where to look?
See http://wpkg.org/Packages.xml#Uninstall - the "uninstall" check type
looks in the registry under:
which is the list that populates the list you see in add/remove programs
in Control Panel.
> What about the exit codes? Are the "exit codes" I've seen in the
> packages syntax for the purpose of
> displaying error messages if the install fails?
See http://wpkg.org/Packages.xml#Actions . By default, if any of the
commands run by wpkg return non-zero exit code, wpkg will consider that
to be a failure and stop running commands. If you want to note that a
particular exit code for a command should actually be considered as
success, then you can add e.g. <exit code="1" /> to ignore exit code of
1, or <exit code="any" /> to accept any exit code as success. For
example, http://wpkg.org/Flash_Player tries to use taskkill to kill
Firefox.exe and iexplore.exe, but the taskkill will return a non-zero
value if the programs aren't running. That shouldn't be considered a
failure so far as wpkg is concerned, so <exit code=... /> is used to
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