dsync: Add per-mailbox sync lock that is always used. Both importing and exporting gets the lock before they even sync the mailbox. The lock is kept until the import/export finishes. This guarantees that no matter how dsync is run, two dsyncs can't be working on the same mailbox at the same time. This lock is in addition to the optional per-user lock enabled by the -l parameter. If the -l parameter is used, the same lock timeout is used for the per-mailbox lock. Otherwise 30s timeout is used. This should help to avoid email duplication when replication is enabled for public namespaces, and maybe in some other rare situations as well.

#ifndef IMAP_URLAUTH_SETTINGS_H
#define IMAP_URLAUTH_SETTINGS_H

struct mail_user_settings;

struct imap_urlauth_settings {
	const char *base_dir;

	bool mail_debug;

	bool verbose_proctitle;

	/* imap_urlauth: */
	const char *imap_urlauth_logout_format;

	const char *imap_urlauth_submit_user;
	const char *imap_urlauth_stream_user;
};

extern const struct imap_urlauth_settings imap_urlauth_default_settings;

extern const struct setting_parser_info imap_urlauth_setting_parser_info;

#endif