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guix archive: Add -r/--recursive. 

* guix/scripts/archive.scm (show-help, %options): Add -r/--recursive.
  (export-from-store): Pass #:recursive? to 'export-paths'.
* doc/guix.texi (Invoking guix archive): Add -r in Emacs example.  Add
  example with ~/.guix-profile.  Document -r/--recursive.
This commit is contained in:
Ludovic Courtès 2015-01-17 17:05:54 +01:00
parent 9decb18c0b
commit 5660708895
2 changed files with 32 additions and 6 deletions
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30
doc/guix.texi
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@ -1386,14 +1386,24 @@ to another machine's store. For example, to transfer the @code{emacs}
package to a machine connected over SSH, one would run:
@example
guix archive --export emacs | ssh the-machine guix archive --import
guix archive --export -r 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.
Similarly, a complete user profile may be transferred from one machine
to another like this:
@example
guix archive --export -r $(readlink -f ~/.guix-profile) | \
ssh the-machine guix-archive --import
@end example
@noindent
However, note that, in both examples, all of @code{emacs} and the
profile as well as all of their dependencies are transferred (due to
@code{-r}), 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', but with a few noteworthy differences
@ -1418,6 +1428,16 @@ The main options are:
Export the specified store files or packages (see below.) Write the
resulting archive to the standard output.
Dependencies are @emph{not} included in the output, unless
@code{--recursive} is passed.
@item -r
@itemx --recursive
When combined with @code{--export}, this instructs @command{guix
archive} to include dependencies of the given items in the archive.
Thus, the resulting archive is self-contained: it contains the closure
of the exported store items.
@item --import
Read an archive from the standard input, and import the files listed
therein into the store. Abort if the archive has an invalid digital

8
guix/scripts/archive.scm
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@ -56,6 +56,8 @@
Export/import one or more packages from/to the store.\n"))
(display (_ "
--export export the specified files/packages to stdout"))
(display (_ "
-r, --recursive combined with '--export', include dependencies"))
(display (_ "
--import import from the archive passed on stdin"))
(display (_ "
@ -107,6 +109,9 @@ Export/import one or more packages from/to the store.\n"))
(option '("export") #f #f
(lambda (opt name arg result)
(alist-cons 'export #t result)))
(option '(#\r "recursive") #f #f
(lambda (opt name arg result)
(alist-cons 'export-recursive? #t result)))
(option '("import") #f #f
(lambda (opt name arg result)
(alist-cons 'import #t result)))
@ -230,7 +235,8 @@ resulting archive to the standard output port."
(if (or (assoc-ref opts 'dry-run?)
(build-derivations store drv))
(export-paths store files (current-output-port))
(export-paths store files (current-output-port)
#:recursive? (assoc-ref opts 'export-recursive?))
(leave (_ "unable to export the given packages~%")))))
(define (generate-key-pair parameters)