$ git clone -n https://src.fedoraproject.org/rpms/perl-Regexp-Shellish.git /var/lib/mock/f45-build-26011-614/root/chroot_tmpdir/scmroot/perl-Regexp-Shellish
Cloning into '/var/lib/mock/f45-build-26011-614/root/chroot_tmpdir/scmroot/perl-Regexp-Shellish'...
$ git fetch origin 07dff8acc5551585ede99d8115cb745843061716:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Regexp-Shellish
 * [new ref]         07dff8acc5551585ede99d8115cb745843061716 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 07dff8a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild