$ git clone -n https://src.fedoraproject.org/rpms/rust-unicode-segmentation.git /var/lib/mock/f42-build-3251799-41222/root/chroot_tmpdir/scmroot/rust-unicode-segmentation
Cloning into '/var/lib/mock/f42-build-3251799-41222/root/chroot_tmpdir/scmroot/rust-unicode-segmentation'...
$ git fetch origin e6139ec2287388f55544ef9cd0095f4604fd93dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-unicode-segmentation
 * [new ref]         e6139ec2287388f55544ef9cd0095f4604fd93dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6139ec Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild