$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-TempDir.git /var/lib/mock/f45-build-26868-619/root/chroot_tmpdir/scmroot/perl-Test-TempDir
Cloning into '/var/lib/mock/f45-build-26868-619/root/chroot_tmpdir/scmroot/perl-Test-TempDir'...
$ git fetch origin 5b939f8d5c3a5c8aa84093a5457de8496f2fbe4f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-TempDir
 * [new ref]         5b939f8d5c3a5c8aa84093a5457de8496f2fbe4f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b939f8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild