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doc: Suggest how to preserve /var and /root owner and permissions.

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Reported by Andreas Enge <andreas@enge.fr>.

* doc/guix.texi (Binary Installation): Suggest --skip-old-files when
  extracting the archive.
This commit is contained in:
Ludovic Courtès 2015-05-17 22:53:11 +02:00
parent d41a8a07b2
commit 8c3a5d7059
1 changed files with 7 additions and 1 deletions
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doc/guix.texi
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@ -269,12 +269,18 @@ As @code{root}, run:
@example
# cd /
# tar xf guix-binary-@value{VERSION}.@var{system}.tar.xz
# tar --skip-old-files -xf \
guix-binary-@value{VERSION}.@var{system}.tar.xz
@end example
This creates @file{/gnu/store} (@pxref{The Store}), @file{/var/guix},
and @file{/root/.guix-profile}. @file{/root/.guix-profile} is a
ready-to-use profile for @code{root} where Guix is installed.
@c '--skip-old-files' does the right thing with tar 1.28. The manual
@c does not clearly document the behavior we describe here, though.
The @code{--skip-old-files} option allows you to make sure the owner and
permissions on @file{/var} and @file{/root} are preserved (@pxref{Option
Summary, @code{--skip-old-files},, tar, GNU tar: an archiver tool}).
Do @emph{not} unpack the tarball on a working Guix system since that
would overwrite its own essential files.