$ git clone -n https://src.fedoraproject.org/rpms/dovecot.git /var/lib/mock/f40-build-780034-130658/root/chroot_tmpdir/scmroot/dovecot
Cloning into '/var/lib/mock/f40-build-780034-130658/root/chroot_tmpdir/scmroot/dovecot'...
$ git fetch origin 79a5cb2d9f4b55b50731c9eea2eada66b0dda4fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dovecot
 * [new ref]         79a5cb2d9f4b55b50731c9eea2eada66b0dda4fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79a5cb2 Rebuild for ICU 74