services: guix: Add 'log-file' configuration option.

* gnu/services/base.scm (<guix-configuration>)[log-file]: New field.
(guix-shepherd-service): Pass #:log-file to 'make-forkexec-constructor'.
* gnu/services/admin.scm (simple-rotation-config): Take a list of
files and join them with commas.
(%default-rotations): Add /var/log/guix-daemon.log.
* doc/guix.texi (Base Services): Document it.

1 files changed, 4 insertions, 0 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 7c37468cdf..bb96385f84 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -8299,6 +8299,10 @@ The list of URLs where to look for substitutes by default.
 @item @code{extra-options} (default: @code{'()})
 List of extra command-line options for @command{guix-daemon}.
 
+@item @code{log-file} (default: @code{"/var/log/guix-daemon.log"})
+File where @command{guix-daemon}'s standard output and standard error
+are written.
+
 @item @code{lsof} (default: @var{lsof})
 The lsof package to use.