$ git clone -n https://src.fedoraproject.org/rpms/jakarta-mail1.git /var/lib/mock/f40-build-2241252-53661/root/chroot_tmpdir/scmroot/jakarta-mail1
Cloning into '/var/lib/mock/f40-build-2241252-53661/root/chroot_tmpdir/scmroot/jakarta-mail1'...
$ git fetch origin f49783923931b43139c976421d006336a58a0c1b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jakarta-mail1
 * [new ref]         f49783923931b43139c976421d006336a58a0c1b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f497839 Convert to compat package