postinst is in 0install-core 2.10-2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
set -e
ZEROINSTALLUSER=zeroinst
SYSTEMCACHE=/var/cache/0install.net/implementations
adduser --home /var/cache/0install.net --system --group --no-create-home --disabled-password "$ZEROINSTALLUSER"
chown "$ZEROINSTALLUSER:$ZEROINSTALLUSER" "$SYSTEMCACHE"
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