d9f4dad986
In mkosi, we want an easy way to set the keyring timeout for every tool we invoke that might use systemd-ask-password to query for a password which is then stored in the kernel keyring. Let's make this possible via a new $SYSTEMD_ASK_PASSWORD_KEYRING_TIMEOUT_SEC environment variable. Using an environment variable means we don't have to modify every separate tool to add a CLI option allowing to specify the timeout. In mkosi specifically, we'll set up a new session keyring for the mkosi process linked to the user keyring so that any pins in the user keyring are used if available, and otherwise we'll query for and store password in mkosi's session keyring with a zero timeout so that they stay in the keyring until the mkosi process exits at which point they're removed from the keyring.
System and Service Manager
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