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-rw-r--r--guix/describe.scm34
1 files changed, 32 insertions, 2 deletions
diff --git a/guix/describe.scm b/guix/describe.scm
index 05bf99eb58..ac89fc0d7c 100644
--- a/guix/describe.scm
+++ b/guix/describe.scm
@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -23,6 +23,7 @@
#:use-module ((guix utils) #:select (location-file))
#:use-module ((guix store) #:select (%store-prefix store-path?))
#:use-module ((guix config) #:select (%state-directory))
+ #:autoload (guix channels) (sexp->channel)
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:export (current-profile
@@ -31,7 +32,8 @@
package-path-entries
package-provenance
- manifest-entry-with-provenance))
+ manifest-entry-with-provenance
+ manifest-entry-provenance))
;;; Commentary:
;;;
@@ -166,3 +168,31 @@ there."
(#f properties)
(sexp `((provenance ,@sexp)
,@properties)))))))))
+
+(define (manifest-entry-provenance entry)
+ "Return the list of channels ENTRY comes from. Return the empty list if
+that information is missing."
+ (match (assq-ref (manifest-entry-properties entry) 'provenance)
+ ((main extras ...)
+ ;; XXX: Until recently, channel sexps lacked the channel name. For
+ ;; entries created by 'manifest-entry-with-provenance', the first sexp
+ ;; is known to be the 'guix channel, and for the other ones, invent a
+ ;; fallback name (it's OK as the name is just a "pet name").
+ (match (sexp->channel main 'guix)
+ (#f '())
+ (channel
+ (let loop ((extras extras)
+ (counter 1)
+ (channels (list channel)))
+ (match extras
+ (()
+ (reverse channels))
+ ((head . tail)
+ (let* ((name (string->symbol
+ (format #f "channel~a" counter)))
+ (extra (sexp->channel head name)))
+ (if extra
+ (loop tail (+ 1 counter) (cons extra channels))
+ (loop tail counter channels)))))))))
+ (_
+ '())))