$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Mojibake.git /var/lib/mock/f45-build-26761-619/root/chroot_tmpdir/scmroot/perl-Test-Mojibake
Cloning into '/var/lib/mock/f45-build-26761-619/root/chroot_tmpdir/scmroot/perl-Test-Mojibake'...
$ git fetch origin 7c64ba4d474e07998863bd0d51e1f7a0a34ee84f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Mojibake
 * [new ref]         7c64ba4d474e07998863bd0d51e1f7a0a34ee84f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c64ba4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild