$ git clone -n https://src.fedoraproject.org/rpms/perl-re-engine-PCRE.git /var/lib/mock/f41-build-815805-149783/root/chroot_tmpdir/scmroot/perl-re-engine-PCRE
Cloning into '/var/lib/mock/f41-build-815805-149783/root/chroot_tmpdir/scmroot/perl-re-engine-PCRE'...
$ git fetch origin 1aa9ce3b9cfa15a59de89fed66991b2e0dbaf921:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-re-engine-PCRE
 * [new ref]         1aa9ce3b9cfa15a59de89fed66991b2e0dbaf921 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1aa9ce3 Perl 5.40 rebuild