Simon L. Nielsen wrote:
On 2007.12.30 04:58:23 +0000, Tim Kientzle wrote:
Log:
Update libarchive to 2.4.10. This includes a number of improvements
that I've been working on but put off committing until after the
RELENG_7 branch, including:
* New manpages: cpio.5 mtree.5
mtree(5) seems to be a general manual page, so wouldn't it make more
sense to have it in src/share/man/man5 or src/usr.sbin/mtree ?
The latter does make more sense; I'll change this. (Since there's
no history in it's current location, there's no point in a repo-copy;
I'll just delete it from it's current location and add it under
src/usr.bin/mtree.)
* New read support: mtree format
This sounds interesting but I can't really figure out what it
does... ? :) (and I couldn't find any mention in the updated manual
pages.)
Still slightly experimental (and relies on mtree files having
an initial signature, which our mtree program doesn't yet insert).
This originated as a means for generating archives with
user-specified metadata. (For example, create a tar archive
with entries owned by root even if you're not running as root.)
NetBSD has hacked their 'tar' program to do something similar;
this implementation allows bsdtar's much more general
archive-conversion capability to do the same thing.
With this, bsdtar can read an mtree file and do any of the following:
* "extract" the file to disk (recreate the disk heirarchy)
tar -xf specification.mtree
* "convert" the mtree spec to a tar or cpio archive (especially
useful with a new mtree key I've introduced that allows specifying
the contents of a file)
tar -cf system.tgz -z --format=pax @specification.mtree
There are particularly intriguing applications to packaging and
installation: the former is essentially a "bulk install", the
latter generates a tarball from the exact same spec for
later installation with a simple tar extract.
Tim Kientzle
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