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-rw-r--r--doc/guix.texi18
1 files changed, 17 insertions, 1 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 390e7949c0..97fddd025e 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -1638,7 +1638,10 @@ a diverse set of independent package builds, we can strengthen the
integrity of our systems. The @command{guix challenge} command aims to
help users assess substitute servers, and to assist developers in
finding out about non-deterministic package builds (@pxref{Invoking guix
-challenge}).
+challenge}). Similarly, the @option{--check} option of @command{guix
+build} allows users to check whether previously-installed substitutes
+are genuine by rebuilding them locally (@pxref{build-check,
+@command{guix build --check}}).
In the future, we want Guix to have support to publish and retrieve
binaries to/from other users, in a peer-to-peer fashion. If you would
@@ -3786,6 +3789,19 @@ $ git clone git://git.sv.gnu.org/guix.git
$ guix build guix --with-source=./guix
@end example
+@anchor{build-check}
+@item --check
+@cindex determinism, checking
+@cindex reproducibility, checking
+Rebuild @var{package-or-derivation}, which are already available in the
+store, and raise an error if the build results are not bit-for-bit
+identical.
+
+This mechanism allows you to check whether previously-installed
+substitutes are genuine (@pxref{Substitutes}), or whether a package's
+build result is deterministic. @xref{Invoking guix challenge}, for more
+background information and tools.
+
@item --no-grafts
Do not ``graft'' packages. In practice, this means that package updates
available as grafts are not applied. @xref{Security Updates}, for more