109 lines
3.7 KiB
C
109 lines
3.7 KiB
C
/*
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* Copyright (c) 2016, 2017, 2018, 2020, 2021 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* hooks.c
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* Upgrade hooks.
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*/
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#include <sys/types.h>
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#include <err.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "fileops.h"
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#include "hooks.h"
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#include "release.h"
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// Files in the /share/sysinstall/hooks directory are added whenever an
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// incompatible operating system change is made that needs additional actions.
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// These files are part of the system manifest and their lack can be tested
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// in upgrade_prepare, but not in upgrade_finalize (as they would have been
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// installed by then). If a file is lacking, then a hook should be run taking
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// the needed action. For instance, if /etc/foo becomes the different /etc/bar,
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// then /share/sysinstall/hooks/osname-x.y-bar would be made, and if it is
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// absent then upgrade_prepare converts /etc/foo to /etc/bar. The file is then
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// made when the system manifest is upgraded.
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//
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// Hooks are meant to run once. However, they must handle if the upgrade fails
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// between the hook running and the hook file being installed when the system
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// manifest is installed. I.e. they need to be reentrant and idempotent.
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//
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// If this system is used, follow the instructions in following-development(7)
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// and add an entry in that manual page about the change.
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__attribute__((used))
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static bool hook_needs_to_be_run(const char* source_prefix,
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const char* target_prefix,
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const char* hook)
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{
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char* source_path;
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char* target_path;
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if ( asprintf(&source_path, "%s/share/sysinstall/hooks/%s",
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source_prefix, hook) < 0 ||
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asprintf(&target_path, "%s/share/sysinstall/hooks/%s",
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target_prefix, hook) < 0 )
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{
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warn("malloc");
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_exit(2);
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}
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bool result = access_or_die(source_path, F_OK) == 0 &&
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access_or_die(target_path, F_OK) < 0;
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free(source_path);
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free(target_path);
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return result;
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}
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void upgrade_prepare(const struct release* old_release,
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const struct release* new_release,
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const char* source_prefix,
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const char* target_prefix)
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{
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(void) old_release;
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(void) new_release;
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(void) source_prefix;
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(void) target_prefix;
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// TODO: After releasing Sortix 1.1, remove this compatibility.
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if ( hook_needs_to_be_run(source_prefix, target_prefix,
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"sortix-1.1-random-seed") )
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{
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char* random_seed_path = join_paths(target_prefix, "/boot/random.seed");
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if ( !random_seed_path )
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{
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warn("malloc");
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_exit(2);
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}
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if ( access_or_die(random_seed_path, F_OK) < 0 )
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{
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printf(" - Creating random seed...\n");
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write_random_seed(random_seed_path);
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}
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free(random_seed_path);
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}
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}
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void upgrade_finalize(const struct release* old_release,
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const struct release* new_release,
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const char* source_prefix,
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const char* target_prefix)
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{
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(void) old_release;
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(void) new_release;
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(void) source_prefix;
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(void) target_prefix;
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}
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