Add `--max-silent-time' to `guix build' and `guix package'.

* guix/scripts/build.scm (%default-options): Add default
  `max-silent-time' value.
  (show-help, %options):  Add `--max-silent-time'.
  (guix-build): Pass `max-silent-time' to `set-build-options'.
* guix/scripts/package.scm (%default-options): Add default
  `max-silent-time' value.
  (show-help, %options):  Add `--max-silent-time'.
  (guix-package): Pass `max-silent-time' to `set-build-options'.
* guix/ui.scm (string->number*): New procedure.
* tests/derivations.scm ("build-expression->derivation and
  max-silent-time"): New test.
* doc/guix.texi (Invoking guix package, Invoking guix build): Document
  `--max-silent-time'.

1 files changed, 6 insertions, 1 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 54325a5b16..c3aab812e2 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -596,7 +596,8 @@ Use @var{profile} instead of the user's default profile.
 Show what would be done without actually doing it.
 
 @item --no-substitutes
-Build instead of resorting to pre-built substitutes.
+@itemx --max-silent-time=@var{seconds}
+Same as for @command{guix build} (@pxref{Invoking guix build}).
 
 @item --verbose
 Produce verbose output.  In particular, emit the environment's build log
@@ -1198,6 +1199,10 @@ Do not build the derivations.
 @item --no-substitutes
 Build instead of resorting to pre-built substitutes.
 
+@item --max-silent-time=@var{seconds}
+When the build or substitution process remains silent for more than
+@var{seconds}, terminate it and report a build failure.
+
 @item --cores=@var{n}
 @itemx -c @var{n}
 Allow the use of up to @var{n} CPU cores for the build.  The special