$ git clone -n https://src.fedoraproject.org/rpms/guestfs-tools.git /var/lib/mock/f39-build-2192549-51470/root/chroot_tmpdir/scmroot/guestfs-tools
Cloning into '/var/lib/mock/f39-build-2192549-51470/root/chroot_tmpdir/scmroot/guestfs-tools'...
$ git fetch origin 99c77d2ea15106105f5a5bcc695f54f19b0a6686:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guestfs-tools
 * [new ref]         99c77d2ea15106105f5a5bcc695f54f19b0a6686 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 99c77d2 New stable version 1.52.0