3519d230c8
Currently we have no way how to specify dependencies between fstab entries (or another units) in the /etc/fstab. It means that users are forced to bypass fstab and write .mount units manually. The patch introduces new systemd fstab options: x-systemd.requires=<PATH> - to specify dependence an another mount (PATH is translated to unit name) x-systemd.requires=<UNIT> - to specify dependence on arbitrary UNIT x-systemd.requires-mounts-for=<PATH ...> - to specify dependence on another paths, implemented by RequiresMountsFor=. The option may be specified more than once. For example two bind mounts where B depends on A: /mnt/test/A /mnt/test/A none bind,defaults /mnt/test/A /mnt/test/B none bind,x-systemd.requires=/mnt/test/A More complex example with overlay FS where one mount point depends on "low" and "upper" directories: /dev/sdc1 /mnt/low ext4 defaults /dev/sdc2 /mnt/high ext4 defaults overlay /mnt/merged overlay lowerdir=/mnt/low,upperdir=/mnt/high/data,workdir=/mnt/high/work,x-systemd.requires-mounts-for=/mnt/low,x-systemd.requires-mounts-for=mnt/high https://bugzilla.redhat.com/show_bug.cgi?id=812826 https://bugzilla.redhat.com/show_bug.cgi?id=1164334
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2015 Zbigniew Jędrzejewski-Szmek
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdbool.h>
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#include <stddef.h>
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#include "macro.h"
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int fstab_filter_options(const char *opts, const char *names,
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const char **namefound, char **value, char **filtered);
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int fstab_extract_values(const char *opts, const char *name, char ***values);
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static inline bool fstab_test_option(const char *opts, const char *names) {
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return !!fstab_filter_options(opts, names, NULL, NULL, NULL);
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}
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int fstab_find_pri(const char *options, int *ret);
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static inline bool fstab_test_yes_no_option(const char *opts, const char *yes_no) {
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int r;
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const char *opt;
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/* If first name given is last, return 1.
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* If second name given is last or neither is found, return 0. */
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r = fstab_filter_options(opts, yes_no, &opt, NULL, NULL);
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assert(r >= 0);
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return opt == yes_no;
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}
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