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authorLudovic Courtès <ludo@gnu.org>2021-01-10 22:13:04 +0100
committerLudovic Courtès <ludo@gnu.org>2021-02-01 17:32:35 +0100
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parent60d72f536437bcef2a4e02faa1fe0c8076049fcc (diff)
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guix package: Add '--export-channels'.
* guix/channels.scm (sexp->channel): Export. * guix/describe.scm: Use (guix channels). (manifest-entry-provenance): New procedure. * guix/scripts/package.scm (channel=?, export-channels): New procedures. (show-help, %options): Add '--export-channels'. (process-query): Honor it. * build-aux/build-self.scm (build-program)[select?]: Exclude (guix channels) to account for the (guix describe) change above. * doc/guix.texi (Invoking guix package): Document it.
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diff --git a/doc/guix.texi b/doc/guix.texi
index e5872b5f24..9e62da438e 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -3616,7 +3616,31 @@ exactly what you specified.
Keep in mind that a manifest is purely symbolic: it only contains
package names and possibly versions, and their meaning varies over time.
-
+If you wish to ``pin'' channels to the revisions that were used to build
+the profile(s), see @option{--export-channels} below.
+
+@cindex pinning, channel revisions of a profile
+@item --export-channels
+Write to standard output the list of channels used by the chosen
+profile(s), in a format suitable for @command{guix pull --channels} or
+@command{guix time-machine --channels} (@pxref{Channels}).
+
+Together with @option{--export-manifest}, this option provides
+information allowing you to replicate the current profile
+(@pxref{Replicating Guix}).
+
+However, note that the output of this command @emph{approximates} what
+was actually used to build this profile. In particular, a single
+profile might have been built from several different revisions of the
+same channel. In that case, @option{--export-manifest} chooses the last
+one and writes the list of other revisions in a comment. If you really
+need to pick packages from different channel revisions, you can use
+inferiors in your manifest to do so (@pxref{Inferiors}).
+
+Together with @option{--export-manifest}, this is a good starting point
+if you are willing to migrate from the ``imperative'' model to the fully
+declarative model consisting of a manifest file along with a channels
+file pinning the exact channel revision(s) you want.
@end table
Finally, since @command{guix package} may actually start build