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-rw-r--r--doc/guix.texi11
-rw-r--r--guix/scripts/archive.scm21
-rw-r--r--tests/guix-archive.sh20
3 files changed, 51 insertions, 1 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
diff --git a/guix/scripts/archive.scm b/guix/scripts/archive.scm
index 3b778d8151..32690c6b45 100644
--- a/guix/scripts/archive.scm
+++ b/guix/scripts/archive.scm
@@ -27,6 +27,8 @@
#:use-module (guix pki)
#:use-module (guix pk-crypto)
#:use-module (ice-9 match)
+ #:use-module (ice-9 format)
+ #:use-module (ice-9 rdelim)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
@@ -55,6 +57,8 @@ Export/import one or more packages from/to the store.\n"))
--export export the specified files/packages to stdout"))
(display (_ "
--import import from the archive passed on stdin"))
+ (display (_ "
+ --missing print the files from stdin that are missing"))
(newline)
(display (_ "
--generate-key[=PARAMETERS]
@@ -102,6 +106,9 @@ Export/import one or more packages from/to the store.\n"))
(option '("import") #f #f
(lambda (opt name arg result)
(alist-cons 'import #t result)))
+ (option '("missing") #f #f
+ (lambda (opt name arg result)
+ (alist-cons 'missing #t result)))
(option '("generate-key") #f #t
(lambda (opt name arg result)
(catch 'gcry-error
@@ -294,6 +301,15 @@ the input port."
(alist-cons 'argument arg result))
%default-options))
+ (define (lines port)
+ ;; Return lines read from PORT.
+ (let loop ((line (read-line port))
+ (result '()))
+ (if (eof-object? line)
+ (reverse result)
+ (loop (read-line port)
+ (cons line result)))))
+
(with-error-handling
;; Ask for absolute file names so that .drv file names passed from the
;; user to 'read-derivation' are absolute when it returns.
@@ -310,6 +326,11 @@ the input port."
(export-from-store store opts))
((assoc-ref opts 'import)
(import-paths store (current-input-port)))
+ ((assoc-ref opts 'missing)
+ (let* ((files (lines (current-input-port)))
+ (missing (remove (cut valid-path? store <>)
+ files)))
+ (format #t "~{~a~%~}" missing)))
(else
(leave
(_ "either '--export' or '--import' \
diff --git a/tests/guix-archive.sh b/tests/guix-archive.sh
index 3ac618ae33..0de7395145 100644
--- a/tests/guix-archive.sh
+++ b/tests/guix-archive.sh
@@ -1,5 +1,5 @@
# GNU Guix --- Functional package management for GNU
-# Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
+# Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org>
#
# This file is part of GNU Guix.
#
@@ -44,5 +44,23 @@ guix archive --import < "$archive" 2>&1 | grep "import.*guile-bootstrap"
if guix archive something-that-does-not-exist
then false; else true; fi
+# This one must not be listed as missing.
+guix build guile-bootstrap > "$archive"
+guix archive --missing < "$archive"
+test "`guix archive --missing < "$archive"`" = ""
+
+# Two out of three should be listed as missing.
+echo "$NIX_STORE_DIR/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-foo" >> "$archive"
+echo "$NIX_STORE_DIR/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-bar" >> "$archive"
+guix archive --missing < "$archive" > "$archive_alt"
+echo "$NIX_STORE_DIR/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-foo" > "$archive"
+echo "$NIX_STORE_DIR/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-bar" >> "$archive"
+cmp "$archive" "$archive_alt"
+
+# This is not a valid store file name, so an error.
+echo something invalid > "$archive"
+if guix archive --missing < "$archive"
+then false; else true; fi
+
if echo foo | guix archive --authorize
then false; else true; fi