$ git clone -n https://src.fedoraproject.org/rpms/python-matplotlib.git /var/lib/mock/f39-build-1601492-38562/root/chroot_tmpdir/scmroot/python-matplotlib
Cloning into '/var/lib/mock/f39-build-1601492-38562/root/chroot_tmpdir/scmroot/python-matplotlib'...
$ git fetch origin 1b16bcd2b06308384beeaa121668488e6aa2d037:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-matplotlib
 * [new ref]         1b16bcd2b06308384beeaa121668488e6aa2d037 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b16bcd Update to latest version (#2247356)