$ git clone -n https://src.fedoraproject.org/rpms/rust-grep-searcher.git /var/lib/mock/f45-build-42198-791/root/chroot_tmpdir/scmroot/rust-grep-searcher
Cloning into '/var/lib/mock/f45-build-42198-791/root/chroot_tmpdir/scmroot/rust-grep-searcher'...
$ git fetch origin 290a76c614ec16629a691fd124303cd6303396cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-grep-searcher
 * [new ref]         290a76c614ec16629a691fd124303cd6303396cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 290a76c Update to version 0.1.17; Fixes RHBZ#2501036