$ git clone -n https://src.fedoraproject.org/rpms/rust-rand_chacha0.2 /var/lib/mock/f42-build-3453400-45488/root/chroot_tmpdir/scmroot/rust-rand_chacha0.2
Cloning into '/var/lib/mock/f42-build-3453400-45488/root/chroot_tmpdir/scmroot/rust-rand_chacha0.2'...
$ git fetch origin 42ce5b7cb5b94df22186bc52404c32a29c10adb7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rand_chacha0.2
 * [new ref]         42ce5b7cb5b94df22186bc52404c32a29c10adb7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 42ce5b7 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild