$ git clone -n https://src.fedoraproject.org/rpms/harfbuzz.git /var/lib/mock/f40-build-780044-130662/root/chroot_tmpdir/scmroot/harfbuzz
Cloning into '/var/lib/mock/f40-build-780044-130662/root/chroot_tmpdir/scmroot/harfbuzz'...
$ git fetch origin e4980ca9e883919501fa35e0bf85ff19e815b48a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/harfbuzz
 * [new ref]         e4980ca9e883919501fa35e0bf85ff19e815b48a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4980ca Rebuild for ICU 74