Re: [Libguestfs] [PATCH] make-fs: Don't use du --apparent-size to estimate input size.

I think it's a difficult problem and one which won't be solved using du. For comparison we have some nbdkit plugins for creating filesystems and they are far more sophisticated, especially this one: https://github.com/libguestfs/nbdkit/tree/master/plugins/floppy I would note that the reason the test fails was nothing to do with free space. It was actually running out of inodes. With ext2/3/4 the number of inodes in the metadata is fixed at creation and based on the size of the disk (see /etc/mke2fs.conf inode_ratio and the mke2fs -i and -N options). Because of the small size of the disk, mke2fs was choosing < 100 inodes, but because the test had 100+ files it failed when creating the later files even though there was enough disk space. There's no easy way to fix this. I think it could even be considered as a bug in mke2fs. Rich.