$ git clone -n https://src.fedoraproject.org/rpms/baresip.git /var/lib/mock/f39-build-2181857-51220/root/chroot_tmpdir/scmroot/baresip
Cloning into '/var/lib/mock/f39-build-2181857-51220/root/chroot_tmpdir/scmroot/baresip'...
$ git fetch origin d4e900835f49a28e757b63b256e41d2591c0de21:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/baresip
 * [new ref]         d4e900835f49a28e757b63b256e41d2591c0de21 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4e9008 Upgrade to 3.8.0 (#2256050)