$ git clone -n https://src.fedoraproject.org/rpms/librsvg2.git /var/lib/mock/f39-build-1791568-41744/root/chroot_tmpdir/scmroot/librsvg2
Cloning into '/var/lib/mock/f39-build-1791568-41744/root/chroot_tmpdir/scmroot/librsvg2'...
$ git fetch origin fb8b9d73587b2b9e9081530e41695b3a1f36943f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librsvg2
 * [new ref]         fb8b9d73587b2b9e9081530e41695b3a1f36943f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb8b9d7 Update to 2.57.0