78f81f02e8
If the read-only FAT file attribute is set on /loader/random-seed, don't update the seed file — and hence don't use it either, since a seed we cannot update would be the same on every boot. This gives users an explicit way to turn off random seed handling by marking the file read-only, useful for example in pre-built OS images that are replicated to many systems, where the baked-in seed is shared and hence must not be credited. The check is done upfront in process_random_seed(), before any other work, mirroring the existing check for read-only volumes. This covers both systemd-boot and systemd-stub, which share this code. Inspired-by: #42979
System and Service Manager
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