configure: Improve the check for the rsync --contimeout option

mstorsjo · mstorsjo · commit 31f0084cbbaa · 2025-02-06T23:47:41.000+02:00
Traditionally, macOS has shipped an old version of rsync that lacked support for this option, hence this check (added in a8b3f0c). However, in macOS 15.x, Apple have switched to providing rsync as a different tool, openrsync. The version of openrsync in at least macOS 15.2 does include "[--contimeout]" (note the lack of "=" after the option), in the output of "rsync --help", but when used, the tool errors out with "rsync: --contimeout=60: unknown option". So apparently the tool erroenously lists the option as supported, while it really isn't. The original rsync tool (with a new enough version) prints "--contimeout=SECONDS" in the output of "rsync --help". It is unclear which version of openrsync Apple are shipping; the latest upstream openrsync from OpenBSD does support the option and includes "[--contimeout=seconds]" in the output of "--help", and older versions don't seem to include the option as listed at all. Therefore, check for "--conntimeout=" with the "=", this should properly detect both new enough rsync and openrsync. This fixes running "fate-rsync" on macOS 15.x. Signed-off-by: Martin Storsjö <martin@martin.st> (cherry picked from commit 3cd4e84)
diff --git a/configure b/configure
@@ -7175,7 +7175,7 @@ enabled makeinfo \
 disabled makeinfo_html && texi2html --help 2> /dev/null | grep -q 'init-file' && enable texi2html || disable texi2html
 perl -v            > /dev/null 2>&1 && enable perl      || disable perl
 pod2man --help     > /dev/null 2>&1 && enable pod2man   || disable pod2man
-rsync --help 2> /dev/null | grep -q 'contimeout' && enable rsync_contimeout || disable rsync_contimeout
+rsync --help 2> /dev/null | grep -q 'contimeout=' && enable rsync_contimeout || disable rsync_contimeout
 xmllint --version  > /dev/null 2>&1 && enable xmllint   || disable xmllint
 
 check_headers linux/fb.h
