deb−preinst − package pre−installation maintainer script
DEBIAN/preinst
A package can perform several pre-installation actions via maintainer scripts, by including an executable preinst file in its control archive (i.e. DEBIAN/preinst during package creation).
The script can
be called in the following ways:
new-preinst install
Before the package is installed.
new-preinst install old-version new-version
Before a removed package is upgraded.
The new-version is passed only since dpkg 1.18.5.
new-preinst upgrade old-version new-version
Before the package is upgraded.
The new-version is passed only since dpkg 1.18.5.
old-preinst abort-upgrade new-version
If postrm fails during upgrade or fails on failed upgrade.
dpkg(1).