$ git clone -n https://src.fedoraproject.org/rpms/libgit2-glib.git /var/lib/mock/f39-build-1549129-36887/root/chroot_tmpdir/scmroot/libgit2-glib
Cloning into '/var/lib/mock/f39-build-1549129-36887/root/chroot_tmpdir/scmroot/libgit2-glib'...
$ git fetch origin a622dfa8b16835682fa58ee1ca15ce24790b33e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgit2-glib
 * [new ref]         a622dfa8b16835682fa58ee1ca15ce24790b33e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a622dfa Update to 1.2.0