$ git clone -n https://src.fedoraproject.org/rpms/rust-prometheus-client.git /var/lib/mock/f39-build-1509395-35434/root/chroot_tmpdir/scmroot/rust-prometheus-client
Cloning into '/var/lib/mock/f39-build-1509395-35434/root/chroot_tmpdir/scmroot/rust-prometheus-client'...
$ git fetch origin 39dfe875a34dc948ecfceb001c30e6ccd4ba2080:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-prometheus-client
 * [new ref]         39dfe875a34dc948ecfceb001c30e6ccd4ba2080 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39dfe87 Initial import (#2214431)