$ git clone -n https://src.fedoraproject.org/rpms/rust-indexmap1.git /var/lib/mock/f38-build-side-43-rust-devel-1414769-31450/root/chroot_tmpdir/scmroot/rust-indexmap1
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1414769-31450/root/chroot_tmpdir/scmroot/rust-indexmap1'...
$ git fetch origin cf637525848efc08874dc8b0c6146236ce18a824:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-indexmap1
 * [new ref]         cf637525848efc08874dc8b0c6146236ce18a824 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf63752 Initial import (indexmap 1 compat package)