$ git clone -n https://src.fedoraproject.org/rpms/perl-Ref-Util-XS.git /var/lib/mock/f31-build-44744-26250/root/thebuilddir/tmp/scmroot/perl-Ref-Util-XS
Cloning into '/var/lib/mock/f31-build-44744-26250/root/thebuilddir/tmp/scmroot/perl-Ref-Util-XS'...
$ git reset --hard b94c40945516279f3bc37e4bf7a1c223ace34715
HEAD is now at b94c409 Perl 5.30 rebuild