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authorLudovic Courtès <ludo@gnu.org>2019-12-07 17:37:08 +0100
committerLudovic Courtès <ludo@gnu.org>2019-12-12 17:56:58 +0100
commit828a39da68a9169ef1d9f9ff02a1c66b1bcbe884 (patch)
tree7b92b771e08dc03dc408eacbbe41de2c5df34304 /doc
parent5208db3a526e3fcdb8473d9bab8afe498c5f3f76 (diff)
downloadpatches-828a39da68a9169ef1d9f9ff02a1c66b1bcbe884.tar
patches-828a39da68a9169ef1d9f9ff02a1c66b1bcbe884.tar.gz
challenge: Support "--diff=diffoscope".
* guix/scripts/challenge.scm (call-with-nar): New procedure. (narinfo-contents): Express in terms of 'call-with-nar'. (call-with-mismatches, report-differing-files/external): New procedures. (%diffoscope-command): New variable. (%options): Support "diffoscope" and a string starting with "/". * tests/challenge.scm (call-mismatch-test): New procedure. ("differing-files"): Rewrite in terms of 'call-mismatch-test'. ("call-with-mismatches"): New test. * doc/guix.texi (Invoking guix challenge): Document it.
Diffstat (limited to 'doc')
-rw-r--r--doc/guix.texi24
1 files changed, 22 insertions, 2 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 80d67a44fa..a5cff4cab2 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -10366,8 +10366,20 @@ results, the inclusion of random numbers, and directory listings sorted
by inode number. See @uref{https://reproducible-builds.org/docs/}, for
more information.
-To find out what is wrong with this Git binary, we can do something along
-these lines (@pxref{Invoking guix archive}):
+To find out what is wrong with this Git binary, the easiest approach is
+to run:
+
+@example
+guix challenge git \
+ --diff=diffoscope \
+ --substitute-urls="https://@value{SUBSTITUTE-SERVER} https://guix.example.org"
+@end example
+
+This automatically invokes @command{diffoscope}, which displays detailed
+information about files that differ.
+
+Alternately, we can do something along these lines (@pxref{Invoking guix
+archive}):
@example
$ wget -q -O - https://@value{SUBSTITUTE-SERVER}/nar/@dots{}-git-2.5.0 \
@@ -10430,6 +10442,14 @@ Upon mismatches, show differences according to @var{mode}, one of:
@item @code{simple} (the default)
Show the list of files that differ.
+@item @code{diffoscope}
+@itemx @var{command}
+Invoke @uref{https://diffoscope.org/, Diffoscope}, passing it
+two directories whose contents do not match.
+
+When @var{command} is an absolute file name, run @var{command} instead
+of Diffoscope.
+
@item @code{none}
Do not show further details about the differences.
@end table