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-rw-r--r--doc/guix.texi8
1 files changed, 7 insertions, 1 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 049292ddff..7dd32c46c8 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -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.