$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Callsite.git /var/lib/mock/f45-build-23067-595/root/chroot_tmpdir/scmroot/perl-Devel-Callsite
Cloning into '/var/lib/mock/f45-build-23067-595/root/chroot_tmpdir/scmroot/perl-Devel-Callsite'...
$ git fetch origin 39c31400973a88566328005205d5aa433bc1c56b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Callsite
 * [new ref]         39c31400973a88566328005205d5aa433bc1c56b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39c3140 Perl 5.44 rebuild