postinst is in libasound2-dev 1.0.25-1ubuntu10.
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 10 11 12 13 14 15 | #!/bin/sh
set -e
case "$1" in
configure)
D=/usr/share/doc/libasound2-dev
if [ -d "$D" ] && ! [ -L "$D" ] ; then
# Work around dpkg's refusal to replace a dir by a symlink
if rmdir "$D" >/dev/null 2>&1 ; then
ln -sf libasound2 "$D"
fi
fi
;;
esac
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