$ git clone -n https://src.fedoraproject.org/rpms/gdb.git /var/lib/mock/f41-build-side-1-2805237-32863/root/chroot_tmpdir/scmroot/gdb
Cloning into '/var/lib/mock/f41-build-side-1-2805237-32863/root/chroot_tmpdir/scmroot/gdb'...
$ git fetch origin 391403edfe05d8e5cf064039a98a07fce0734b79:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gdb
 * [new ref]         391403edfe05d8e5cf064039a98a07fce0734b79 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 391403e Remove patch gdb-rhbz1007614-memleak-infpy_read_memory-test.patch