$ git clone -n https://src.fedoraproject.org/rpms/rust-grep-regex.git /var/lib/mock/f39-build-1578598-38002/root/chroot_tmpdir/scmroot/rust-grep-regex
Cloning into '/var/lib/mock/f39-build-1578598-38002/root/chroot_tmpdir/scmroot/rust-grep-regex'...
$ git fetch origin 65e8faafd01c4463e7c77ce99675a750bac97280:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-grep-regex
 * [new ref]         65e8faafd01c4463e7c77ce99675a750bac97280 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65e8faa Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild