Now that sd-stub will place the PCR signature and its public key in the initrd's /.extra/ directory, let's copy it from there into /run/ from userspace. This is done because /.extra/ is on the initrd's tmpfs which will be emptied during the initrd → host transition. Since we want these two files to survive we'll copy them – if they exist – into /run/ where they will survive the transition. Thus, with this last change the files will have safely propagated from their PE sections into files in /run/ where userspace can find them The paths in /run/ happen to be the exact ones that systemd-cryptenroll/systemd-cryptsetup/systemd-creds look for them.
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