postinst is in dracut 027-1.
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 | #!/bin/sh
set -e
# check if any kernel is available
# do not call dracut if no kernel was found
if ls /boot/vmlinu[zx]-* >/dev/null 2>&1; then
# Regenerate initramfs for all kernel that are installed
for kversion in `ls /boot/vmlinu[zx]-* | sed -e 's#/boot/vmlinu.-##'`; do
/etc/kernel/postinst.d/dracut $kversion
done
fi
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