$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-IMAP-Client.git /var/lib/mock/f45-build-25295-610/root/chroot_tmpdir/scmroot/perl-Net-IMAP-Client
Cloning into '/var/lib/mock/f45-build-25295-610/root/chroot_tmpdir/scmroot/perl-Net-IMAP-Client'...
$ git fetch origin 747704a2d6e9c4a123cd65d0bd0d4c3ea2c150f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-IMAP-Client
 * [new ref]         747704a2d6e9c4a123cd65d0bd0d4c3ea2c150f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 747704a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild