This file is indexed.

/lib/partman/finish.d/39create_fstab_header is in ubiquity 2.18.7.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

mkdir -p /target/etc

case `udpkg --print-os` in
        linux) 
		cat >/target/etc/fstab <<EOF
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
EOF
		printf "%-15s %-15s %-7s %-15s %-7s %s\n" '# <file system>' '<mount point>' '<type>' '<options>' '<dump>' '<pass>' >> /target/etc/fstab
	;;

	kfreebsd)
		cat >/target/etc/fstab <<EOF
# /etc/fstab: static file system information.
#
EOF
		printf "%-15s %-15s %-7s %-15s %-7s %s\n" '# <file system>' '<mount point>' '<type>' '<options>' '<dump>' '<pass>' >> /target/etc/fstab

		printf "%-15s %-15s %-7s %-15s %-7s %s\n" proc /proc linprocfs rw 0 0 >> /target/etc/fstab
		printf "%-15s %-15s %-7s %-15s %-7s %s\n" sys /sys linsysfs rw 0 0 >> /target/etc/fstab
		printf "%-15s %-15s %-7s %-15s %-7s %s\n" fdesc /dev/fd fdescfs rw 0 0 >> /target/etc/fstab
	;;

	hurd)
		cat >/target/etc/fstab <<EOF
# /etc/fstab: static file system information.
#
EOF
		printf "%-15s %-15s %-7s %-15s %-7s %s\n" '# <file system>' '<mount point>' '<type>' '<options>' '<dump>' '<pass>' >> /target/etc/fstab
	;;
esac