Mike Yuan
cfbf7538d8
fresh otherwise Currently, exec_setup_credential() always rewrite all credentials upon exec_invoke(), i.e. invocation of each ExecCommand, and within a single tmpfs instance. This is problematic though: * When writing each tmp cred file, we essentially double the size of the credential. Therefore, if one cred is bigger than half of CREDENTIALS_TOTAL_SIZE_MAX, confusing ENOSPC occurs (see also https://github.com/systemd/systemd/pull/24734#issuecomment-1925440546) * Credential is a unit-wide thing and thus should not change during the whole lifetime of main process. However, if e.g. a on-disk credential or SetCredential= in unit file changes between ExecStart= and ExecStartPost=, the credentials are overwritten when the latter gets to run, and the already-running main process is suddenly seeing completely different creds. So, let's try to reuse final cred dir if the main process has started and the tmpfs has been populated, so that the creds used is stable across all ExecStart= and ExecStartPost=-s. We still want to retain the ability of updating creds through ExecStartPre= though, therefore we forcibly use a fresh cred dir for those. 'Fresh' means to actually unmount the old tmpfs first, so the first problem goes away, too.
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