$ git clone -n https://src.fedoraproject.org/rpms/perl-Tk-ToolBar.git /var/lib/mock/f45-build-27248-622/root/chroot_tmpdir/scmroot/perl-Tk-ToolBar
Cloning into '/var/lib/mock/f45-build-27248-622/root/chroot_tmpdir/scmroot/perl-Tk-ToolBar'...
$ git fetch origin f2108f7ae5357e1b9c80adb12b6b8cabd4acd93e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Tk-ToolBar
 * [new ref]         f2108f7ae5357e1b9c80adb12b6b8cabd4acd93e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f2108f7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild