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Diffstat (limited to 'doc/guix.texi')
| -rw-r--r-- | doc/guix.texi | 25 |
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: |