$ git clone -n https://src.fedoraproject.org/rpms/re2.git /var/lib/mock/f42-build-862663-170997/root/chroot_tmpdir/scmroot/re2
Cloning into '/var/lib/mock/f42-build-862663-170997/root/chroot_tmpdir/scmroot/re2'...
$ git fetch origin ab144e1762f05d5d2e29c240670c951223031581:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/re2
 * [new ref]         ab144e1762f05d5d2e29c240670c951223031581 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ab144e1 Rebuild for ICU 76