$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Comments.git /var/lib/mock/f45-build-23065-595/root/chroot_tmpdir/scmroot/perl-Devel-Comments
Cloning into '/var/lib/mock/f45-build-23065-595/root/chroot_tmpdir/scmroot/perl-Devel-Comments'...
$ git fetch origin 4c9e9cbcee412c89955ababd0b607a157cca5fa9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Comments
 * [new ref]         4c9e9cbcee412c89955ababd0b607a157cca5fa9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c9e9cb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild