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[bug #57652] minix filesystem detection too optimistic

From: Stefan Seyfried
Subject: [bug #57652] minix filesystem detection too optimistic
Date: Wed, 22 Jan 2020 05:24:56 -0500 (EST)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36

Follow-up Comment #1, bug #57652 (project grub):

Adding a reproducer script.
This does the following:

* create a filesystem image file sized 1GB
* create a partition on the image and an ext3 file system in it
* mount the partition
* debootstrap debian stable into the mountpoint
* install grub2 into the debian image (from package, here you could install
your self-built grub2...)
* check for the number of free inodes
* create as many dummy files to exactly hit a bad magic number
* unmount / mount to update the superblock
* chroot => grub-install

grub-install will fail.

it is called as root:

# bash ./grub-bug-57652-reproduce.sh /space/grub.img /mnt

/space should have 1GB of free space of course :-)


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