$ git clone -n https://src.fedoraproject.org/rpms/rust-num-rational.git /var/lib/mock/f39-build-1522127-35887/root/chroot_tmpdir/scmroot/rust-num-rational
Cloning into '/var/lib/mock/f39-build-1522127-35887/root/chroot_tmpdir/scmroot/rust-num-rational'...
$ git fetch origin d2d51ff745eb65b706cf6bb3c1696937bfefad60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-num-rational
 * [new ref]         d2d51ff745eb65b706cf6bb3c1696937bfefad60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d2d51ff Regenerate with rust2rpm v24