$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-Build-MB.git /var/lib/mock/f39-build-1928324-43067/root/chroot_tmpdir/scmroot/perl-Alien-Build-MB
Cloning into '/var/lib/mock/f39-build-1928324-43067/root/chroot_tmpdir/scmroot/perl-Alien-Build-MB'...
$ git fetch origin 780e6cf47d590f93a2faec78e80325768e249d45:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Alien-Build-MB
 * [new ref]         780e6cf47d590f93a2faec78e80325768e249d45 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 780e6cf Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild