$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-StackTrace-Extract.git /var/lib/mock/f45-build-23137-596/root/chroot_tmpdir/scmroot/perl-Devel-StackTrace-Extract
Cloning into '/var/lib/mock/f45-build-23137-596/root/chroot_tmpdir/scmroot/perl-Devel-StackTrace-Extract'...
$ git fetch origin a52d584e9e7d370dc6f043c68a7fef90444c2c8f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-StackTrace-Extract
 * [new ref]         a52d584e9e7d370dc6f043c68a7fef90444c2c8f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a52d584 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild