$ git clone -n https://src.fedoraproject.org/rpms/perl-Authen-Captcha.git /var/lib/mock/f45-build-21831-588/root/chroot_tmpdir/scmroot/perl-Authen-Captcha
Cloning into '/var/lib/mock/f45-build-21831-588/root/chroot_tmpdir/scmroot/perl-Authen-Captcha'...
$ git fetch origin e210c1ccf1108cc67992285c351723dd474236b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Authen-Captcha
 * [new ref]         e210c1ccf1108cc67992285c351723dd474236b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e210c1c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild