mirror of
https://github.com/morgan9e/systemd
synced 2026-04-15 00:47:10 +09:00
0dc39dffbd
Some configuration files that need updates are directly under in /etc. To update them atomically, we need write access to /etc. For Ubuntu Core this is an issue as /etc is not writable. Only a selection of subdirectories can be writable. The general solution is symlinks or bind mounts to writable places. But for atomic writes in /etc, that does not work. So Ubuntu has had a patch for that that did not age well. Instead we would like to introduce some environment variables for alternate paths. * SYSTEMD_ETC_HOSTNAME: /etc/hostname * SYSTEMD_ETC_MACHINE_INFO: /etc/machine-info * SYSTEMD_ETC_LOCALTIME: /etc/localtime * SYSTEMD_ETC_LOCALE_CONF: /etc/locale.conf * SYSTEMD_ETC_VCONSOLE_CONF: /etc/vconsole.conf * SYSTEMD_ETC_ADJTIME: /etc/adjtime While it is for now expected that there is a symlink from the standard, we still try to read them from that alternate path. This is important for `/etc/localtime`, which is a symlink, so we cannot have an indirect symlink or bind mount for it. Since machine-id is typically written only once and not updated. This commit does not cover it. An initrd can properly create it and bind mount it.
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include "forward.h"
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#include "strv.h"
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char* get_default_hostname_raw(void);
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bool valid_ldh_char(char c) _const_;
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typedef enum ValidHostnameFlags {
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VALID_HOSTNAME_TRAILING_DOT = 1 << 0, /* Accept trailing dot on multi-label names */
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VALID_HOSTNAME_DOT_HOST = 1 << 1, /* Accept ".host" as valid hostname */
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VALID_HOSTNAME_QUESTION_MARK = 1 << 2, /* Accept "?" as place holder for hashed machine ID value */
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} ValidHostnameFlags;
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bool hostname_is_valid(const char *s, ValidHostnameFlags flags) _pure_;
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char* hostname_cleanup(char *s);
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bool is_localhost(const char *hostname);
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static inline bool is_gateway_hostname(const char *hostname) {
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/* This tries to identify the valid syntaxes for the our synthetic "gateway" host. */
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return STRCASE_IN_SET(hostname, "_gateway", "_gateway.");
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}
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static inline bool is_outbound_hostname(const char *hostname) {
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/* This tries to identify the valid syntaxes for the our synthetic "outbound" host. */
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return STRCASE_IN_SET(hostname, "_outbound", "_outbound.");
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}
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static inline bool is_dns_stub_hostname(const char *hostname) {
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return STRCASE_IN_SET(hostname, "_localdnsstub", "_localdnsstub.");
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}
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static inline bool is_dns_proxy_stub_hostname(const char *hostname) {
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return STRCASE_IN_SET(hostname, "_localdnsproxy", "_localdnsproxy.");
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}
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const char* etc_hostname(void);
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const char* etc_machine_info(void);
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int get_pretty_hostname(char **ret);
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int machine_spec_valid(const char *s);
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int split_user_at_host(const char *s, char **ret_user, char **ret_host);
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