Circa 2004-02-18 13:57:45 -0500 dixit Christoph Doerbeck a242369:
:
: Is it appropriate to use $1 in %post and %postun to determine
: install/update vs. remove.
:
: The packages I've built have some different behavior based on whether
: it is being upgraded or removed. I determined from sparse documentation
: that $1 represents the remaining instances of the package at the completion
: of the current operation.
:
: $1 = 0 (erase)
: $1 = 1 (erase phase of upgrade/ install)
: $1 = 2 (install phase of upgrade)
:
: This has tested successfully, but I'd like to know if this is a dependable
: test....
Actually, for %pre, %preun, %post, and %postun scriptlets, the first
argument to the scriptlet ($1 for /bin/sh) is the number of instances of
the current package that will remain after the current operation is
complete. That is:
Scriptlet $1 is
%pre, %post = 1 for a fresh install
> 1 if a prior instance exists
%preun, %postun = 0 if this is the last package
> 0 if other instances exist
Be careful not to test for equality to 2, because more than one instance
of the package may already be installed. Generally, all you need is
this:
%post
# This works for %pre as well
if [ x"$1" = x"1" ]; then
# No prior instance of this package exists.
else
# This is either an upgrade, or a multiple install.
fi
%preun
# Works for %postun as well
if [ x"$1" = x"0" ]; then
# We're erasing the last instance of the package.
else
# This was an upgrade, or we're erasing one of multiple
# package instances.
fi
This is explained in more detail with some examples in the dated but
still relevant 'Maximum RPM' (in PostScript format, viewable with
Ghostscript):
http://www.rpm.org/
http://www.rpm.org/local/maximum-rpm.ps.gz
Triggers get slightly more complicated; see the text documentation
accompanying RPM about triggers for more info and examples.
Good luck.
--
jim knoble | jmknoble@xxxxxxxxx | http://www.pobox.com/~jmknoble/
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