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-rw-r--r--doc/guix.texi11
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index d5884008f4..93d1c2be3b 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -938,6 +938,12 @@ package to a machine connected over SSH, one would run:
guix archive --export emacs | ssh the-machine guix archive --import
@end example
+@noindent
+However, note that, in this example, all of @code{emacs} and its
+dependencies are transferred, regardless of what is already available in
+the target machine's store. The @code{--missing} option can help figure
+out which items are missing from the target's store.
+
Archives are stored in the ``Nix archive'' or ``Nar'' format, which is
comparable in spirit to `tar'. When exporting, the daemon digitally
signs the contents of the archive, and that digital signature is
@@ -959,6 +965,11 @@ therein into the store. Abort if the archive has an invalid digital
signature, or if it is signed by a public key not among the authorized
keys (see @code{--authorize} below.)
+@item --missing
+Read a list of store file names from the standard input, one per line,
+and write on the standard output the subset of these files missing from
+the store.
+
@item --generate-key[=@var{parameters}]
@cindex signing, archives
Generate a new key pair for the daemons. This is a prerequisite before