$ git clone -n https://src.fedoraproject.org/rpms/rust-sha2.git /var/lib/mock/f39-build-1517142-35689/root/chroot_tmpdir/scmroot/rust-sha2
Cloning into '/var/lib/mock/f39-build-1517142-35689/root/chroot_tmpdir/scmroot/rust-sha2'...
$ git fetch origin 3c28da8c5e788abdd547aaa9c8256084dd12d290:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sha2
 * [new ref]         3c28da8c5e788abdd547aaa9c8256084dd12d290 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c28da8 Update to version 0.10.8; Fixes RHBZ#2240782