Ivan Kruglov
c925e405f3
So far --graceful only short-circuited when no TPM was present at all (the !tpm2_is_mostly_supported() check). If a TPM is present but can't actually be used for the measurement we want, the measurement still failed hard. For systemd-pcrextend instances ordered before sysinit.target this pushes the system to degraded and blocks boot, which defeats the purpose of --graceful. Make the two extend helpers report every "TPM is present-or-absent but cannot be used for this measurement" condition with a single errno, -EOPNOTSUPP: no usable PCR bank, no TPM device, missing crypto (e.g. AES-128-CFB), no NvPCR support, and OpenSSL-less builds. tpm2_context_new_or_warn() reports a missing device as -ENOENT, so each helper translates that to -EOPNOTSUPP at the call site, keeping every errno single-meaning. Co-developed-by: Claude Opus 4.8 <noreply@anthropic.com>
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