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| author | Ludovic Courtès <ludo@gnu.org> | 2017-01-17 22:58:37 +0100 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2017-01-17 23:57:15 +0100 |
| commit | 6cd1059340758669a7d98c4611f5d418b51899f2 (patch) | |
| tree | 6a0426cf9b04cba104da72e5180599dc76236461 | |
| parent | 1f4f2360ad70b62cd210501ba4c8b49dd7b37864 (diff) | |
| download | patches-6cd1059340758669a7d98c4611f5d418b51899f2.tar patches-6cd1059340758669a7d98c4611f5d418b51899f2.tar.gz | |
doc: Add '--manifest' example using 'specification->package+output'.
* doc/guix.texi (Invoking guix package): Add --manifest example using
'specification->package+output'.
| -rw-r--r-- | doc/guix.texi | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index bf9dbaa726..a212666af0 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -1685,6 +1685,20 @@ of packages: (list guile-2.0 "debug"))) @end example +@findex specification->package+output +In this example we have to know which modules define the @code{emacs} +and @code{guile-2.0} variables to provide the right +@code{use-package-modules} line, which can be cumbersome. We can +instead provide regular package specifications and let +@code{specification->package-output} look up the corresponding package +objects, like this: + +@example +(packages->manifest + (map (compose list specification->package+output) + '("emacs" "guile@@2.0" "guile@@2.0:debug"))) +@end example + @item --roll-back @cindex rolling back @cindex undoing transactions |