$ git clone -n https://src.fedoraproject.org/rpms/perl-File-ExtAttr.git /var/lib/mock/f41-build-714901-13069/root/chroot_tmpdir/scmroot/perl-File-ExtAttr
Cloning into '/var/lib/mock/f41-build-714901-13069/root/chroot_tmpdir/scmroot/perl-File-ExtAttr'...
$ git fetch origin cdcfbadb82c25f596ee3f07e912664e1e82dd0ab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-File-ExtAttr
 * [new ref]         cdcfbadb82c25f596ee3f07e912664e1e82dd0ab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cdcfbad Eliminate use of obsolete %patchN syntax (#2283636)