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authorLudovic Courtès <ludo@gnu.org>2015-10-19 10:09:28 +0200
committerLudovic Courtès <ludo@gnu.org>2015-10-19 10:10:47 +0200
commitc6f8e9dd64feb1ad174201277cf2ad0784f7d001 (patch)
tree2046cef1ef26ec458c0831fd6ee6156921528350 /doc
parent1d19bc11620dd0421569712748262f5c411342f8 (diff)
downloadpatches-c6f8e9dd64feb1ad174201277cf2ad0784f7d001.tar
patches-c6f8e9dd64feb1ad174201277cf2ad0784f7d001.tar.gz
guix archive: Add '--extract'.
* guix/scripts/archive.scm (show-help, %options): Add --extract. (guix-archive): Honor it. * tests/guix-archive.sh: Test it. * doc/guix.texi (Invoking guix archive): Document it.
Diffstat (limited to 'doc')
-rw-r--r--doc/guix.texi25
1 files changed, 25 insertions, 0 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index fd0adfd203..6d24343025 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -1931,6 +1931,31 @@ The list of authorized keys is kept in the human-editable file
s-expressions''} and is structured as an access-control list in the
@url{http://theworld.com/~cme/spki.txt, Simple Public-Key Infrastructure
(SPKI)}.
+
+@item --extract=@var{directory}
+@itemx -x @var{directory}
+Read a single-item archive as served by substitute servers
+(@pxref{Substitutes}) and extract it to @var{directory}. This is a
+low-level operation needed in only very narrow use cases; see below.
+
+For example, the following command extracts the substitute for Emacs
+served by @code{hydra.gnu.org} to @file{/tmp/emacs}:
+
+@example
+$ wget -O - \
+ http://hydra.gnu.org/nar/@dots{}-emacs-24.5 \
+ | bunzip2 | guix archive -x /tmp/emacs
+@end example
+
+Single-item archives are different from multiple-item archives produced
+by @command{guix archive --export}; they contain a single store item,
+and they do @emph{not} embed a signature. Thus this operation does
+@emph{no} signature verification and its output should be considered
+unsafe.
+
+The primary purpose of this operation is to facilitate inspection of
+archive contents coming from possibly untrusted substitute servers.
+
@end table
To export store files as an archive to the standard output, run: