$ git clone -n https://src.fedoraproject.org/rpms/libirecovery.git /var/lib/mock/f39-build-1591906-38303/root/chroot_tmpdir/scmroot/libirecovery
Cloning into '/var/lib/mock/f39-build-1591906-38303/root/chroot_tmpdir/scmroot/libirecovery'...
$ git fetch origin 427678d538654ce8f8df4d86091a2f77dd806ecd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libirecovery
 * [new ref]         427678d538654ce8f8df4d86091a2f77dd806ecd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 427678d Use release tarball