$ git clone -n https://src.fedoraproject.org/rpms/file.git /var/lib/mock/f42-build-side-1-3534464-46551/root/chroot_tmpdir/scmroot/file
Cloning into '/var/lib/mock/f42-build-side-1-3534464-46551/root/chroot_tmpdir/scmroot/file'...
$ git fetch origin fa9295c2f7849fe0aa7c7b2b14ee67b429215b05:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/file
 * [new ref]         fa9295c2f7849fe0aa7c7b2b14ee67b429215b05 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
Updating files:  47% (456/951)
Updating files:  48% (457/951)
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Updating files: 100% (951/951)
Updating files: 100% (951/951), done.
HEAD is now at fa9295c Fix stack overrun