$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-Build.git /var/lib/mock/f39-build-1678737-40969/root/chroot_tmpdir/scmroot/perl-Alien-Build
Cloning into '/var/lib/mock/f39-build-1678737-40969/root/chroot_tmpdir/scmroot/perl-Alien-Build'...
$ git fetch origin dfc1c03736ff097491ef193851d7d9c8f9a601af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Alien-Build
 * [new ref]         dfc1c03736ff097491ef193851d7d9c8f9a601af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dfc1c03 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild