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c6890399 |
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17-Aug-2022 |
Jessica Clarke <jrtc27@FreeBSD.org> |
makefs: Fix issues building as a cross-tool on non-FreeBSD This adds missing includes, uses the standard dirent.h rather than the BSD-specific sys/dirent.h subset (which works on macOS but not Linux) and works around Linux's lack of st_birthtim. This allows usr.sbin/makefs to be added to LOCAL_XTOOL_DIRS again on macOS and Linux so that disk images can be cross-built. Reviewed by: markj Fixes: 240afd8c1fcc ("makefs: Add ZFS support") Differential Revision: https://reviews.freebsd.org/D36135
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240afd8c |
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05-Aug-2022 |
Mark Johnston <markj@FreeBSD.org> |
makefs: Add ZFS support This allows one to take a staged directory tree and create a file consisting of a ZFS pool with one or more datasets that contain the contents of the directory tree. This is useful for creating virtual machine images without using the kernel to create a pool; "zpool create" requires root privileges and currently is not permitted in jails. makefs -t zfs also provides reproducible images by using a fixed seed for pseudo-random number generation, used for generating GUIDs and hash salts. makefs -t zfs requires relatively little by way of machine resources. The "zpool_reguid" rc.conf setting can be used to ask a FreeBSD guest to generate a unique pool GUID upon first boot. A small number of pool and dataset properties are supported. The pool is backed by a single disk vdev. Data is always checksummed using Fletcher-4, no redundant copies are made, and no compression is used. The manual page documents supported pool and filesystem properties. The implementation uses a few pieces of ZFS support from with the boot loader, especially definitions for various on-disk structures, but is otherwise standalone and in particular doesn't depend on OpenZFS. This feature should be treated as experimental for now, i.e., important data shouldn't be trusted to a makefs-created pool, and the command-line interface is subject to change. Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D35248
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