This commit adds hole-punching support to the truncate(1) utility. If
the option -d is specified, truncate(1) performs zeroing, and if
possible hole-punching in case the operation is supported by the
underlying file system of the specified files.
Sponsored by: The FreeBSD Foundation
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D31556
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.
The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
No functional change intended.
The change to expand_number (r204654) broke detection of too large sizes and
relative sizes ('+'/'-').
Also add some tests.
PR: 190735
Submitted by: Kirk Russell
MFC after: 1 week
This speeds up my testing a bit. Because truncate(1) doesn't allocate
blocks on file system before they are used, it is very useful to
emulate huge file systems:
# truncate -s 16T fs.img
# mdconfig -a -f fs.img
# newfs /dev/mdX
(-t swap can be used as well)
