$ git clone -n https://src.fedoraproject.org/rpms/rust-regex-syntax0.7.git /var/lib/mock/f38-build-side-43-rust-devel-1421980-31465/root/chroot_tmpdir/scmroot/rust-regex-syntax0.7
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1421980-31465/root/chroot_tmpdir/scmroot/rust-regex-syntax0.7'...
$ git fetch origin 1de3f0f5d80f7c795dcc00e725e46749c8be624b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-regex-syntax0.7
 * [new ref]         1de3f0f5d80f7c795dcc00e725e46749c8be624b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1de3f0f Initial import (regex-syntax 0.7 compat package)