$ git clone -n https://src.fedoraproject.org/rpms/perl-Image-PNG-Libpng.git /var/lib/mock/f40-build-779061-130178/root/chroot_tmpdir/scmroot/perl-Image-PNG-Libpng
Cloning into '/var/lib/mock/f40-build-779061-130178/root/chroot_tmpdir/scmroot/perl-Image-PNG-Libpng'...
$ git reset --hard 794c8607fda5d7fc17be240a82b35c883c944ddf
HEAD is now at 794c860 Use a macro instead of RPM_BUILD_ROOT variable