$ git clone -n https://src.fedoraproject.org/rpms/perl-Readonly-XS.git /var/lib/mock/f31-build-44263-25978/root/thebuilddir/tmp/scmroot/perl-Readonly-XS
Cloning into '/var/lib/mock/f31-build-44263-25978/root/thebuilddir/tmp/scmroot/perl-Readonly-XS'...
$ git reset --hard 15a8fe49d77613b5423133e20bddb78683f2421b
HEAD is now at 15a8fe4 Perl 5.30 rebuild