$ git clone -n https://src.fedoraproject.org/rpms/perl-POSIX-AtFork.git /var/lib/mock/f45-build-25623-612/root/chroot_tmpdir/scmroot/perl-POSIX-AtFork
Cloning into '/var/lib/mock/f45-build-25623-612/root/chroot_tmpdir/scmroot/perl-POSIX-AtFork'...
$ git fetch origin 5a06484c32d84f544cdbab88d7e0a545a1191f83:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-POSIX-AtFork
 * [new ref]         5a06484c32d84f544cdbab88d7e0a545a1191f83 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a06484 Perl 5.44 rebuild