$ git clone -n https://src.fedoraproject.org/rpms/golang-github-dennwc-btrfs.git /var/lib/mock/f39-build-1508916-35416/root/chroot_tmpdir/scmroot/golang-github-dennwc-btrfs
Cloning into '/var/lib/mock/f39-build-1508916-35416/root/chroot_tmpdir/scmroot/golang-github-dennwc-btrfs'...
$ git fetch origin 1ba0d7e434c6eeb5a7e29e3676f841298d4931e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-dennwc-btrfs
 * [new ref]         1ba0d7e434c6eeb5a7e29e3676f841298d4931e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ba0d7e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild