$ git clone -n https://src.fedoraproject.org/rpms/rust-is-terminal.git /var/lib/mock/f39-build-1660892-40652/root/chroot_tmpdir/scmroot/rust-is-terminal
Cloning into '/var/lib/mock/f39-build-1660892-40652/root/chroot_tmpdir/scmroot/rust-is-terminal'...
$ git fetch origin b013ac1fc525292f6a28501a0006671dc26dd6ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-is-terminal
 * [new ref]         b013ac1fc525292f6a28501a0006671dc26dd6ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b013ac1 Update to version 0.4.9; Fixes RHBZ#2218702