$ git clone -n https://src.fedoraproject.org/rpms/rust-const-cstr.git /var/lib/mock/f39-build-1455250-32915/root/chroot_tmpdir/scmroot/rust-const-cstr
Cloning into '/var/lib/mock/f39-build-1455250-32915/root/chroot_tmpdir/scmroot/rust-const-cstr'...
$ git fetch origin 3ad111ac6dbcc9851f717d12e9b4252deb57adf2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-const-cstr
 * [new ref]         3ad111ac6dbcc9851f717d12e9b4252deb57adf2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ad111a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild