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/*-
* redshift-ng - Automatically adjust display colour temperature according the Sun
*
* Copyright (c) 2009-2018 Jon Lund Steffensen <jonlst@gmail.com>
* Copyright (c) 2014-2016, 2025 Mattias Andrée <m@maandree.se>
*
* redshift-ng is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* redshift-ng is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with redshift-ng. If not, see <http://www.gnu.org/licenses/>.
*/
#include "common.h"
/**
* Names of periods supplied to scripts
*/
static const char *period_names[] = {
[PERIOD_NONE] = "none",
[PERIOD_DAYTIME] = "daytime",
[PERIOD_NIGHT] = "night",
[PERIOD_TRANSITION] = "transition"
};
/**
* Path name of the hook directory, `NULL` if not found
*/
static char *dirpath = NULL;
/**
* The allocation size of `dirpath`
*/
static size_t dirpathsize;
/**
* The length of the string in `dirpath`
*/
static size_t dirpathlen;
/**
* Paths, in order of priority, to test when looking for
* the hook directory for redshift
*/
static const struct env_path paths[] = {
{0, "XDG_CONFIG_HOME", "/redshift-ng/hooks"},
{0, "XDG_CONFIG_HOME", "/redshift/hooks"},
#if defined(WINDOWS)
{0, "localappdata", "/redshift-ng/hooks"},
{0, "localappdata", "/redshift/hooks"},
#endif
{0, "HOME", "/.config/redshift-ng/hooks"},
{0, "HOME", "/.config/redshift/hooks"},
{0, NULL, "/.config/redshift-ng/hooks"},
{0, NULL, "/.config/redshift/hooks"},
{1, "XDG_CONFIG_DIRS", "/redshift-ng/hooks"},
{1, "XDG_CONFIG_DIRS", "/redshift/hooks"},
#if !defined(WINDOWS)
{0, "", "/etc/redshift-ng/hooks"},
{0, "", "/etc/redshift/hooks"}
#endif
};
/**
* Deallocates `dirpath`
*/
static void
cleanup(void)
{
free(dirpath);
dirpath = NULL;
}
/**
* Search for and open the hook directory for reading
*
* @param path_out Output parameter for the hook directroy path
* @param pathbuf_out Output parameter for the memory allocation for `*path_out`;
* will be set to `NULL`; shall be free(3)d by the caller
* @return `DIR` object for the reading the directory; `NULL` if not found
*/
static DIR *
open_hooks_dir(const char **path_out, char **pathbuf_out)
{
DIR *dir = NULL;
size_t i;
*path_out = NULL;
*pathbuf_out = NULL;
for (i = 0; !dir && i < ELEMSOF(paths); i++)
dir = try_path_opendir(&paths[i], path_out, pathbuf_out);
if (dir)
weprintf(_("Found hook directory `%s'."), *path_out);
else
weprintf(_("No hook directory found."));
return dir;
}
/**
* Run hook file
*
* @param path The path to the hook file
* @param argv `NULL` terminated list of command line arguments
* for the hooks; must contain an unused initial slot,
* which the function will use to provide the zeroth
* argument
*/
static void
run_hook(const char *path, const char *argv[])
{
#ifdef WINDOWS
/* TODO [Windows] hooks are not support on Windows */
#else
switch (fork()) {
case -1:
weprintf("fork:");
break;
case 0:
if (dup2(STDOUT_FILENO, STDERR_FILENO) != STDERR_FILENO) {
weprintf("dup2 <stdout> <stderr>:");
_exit(1);
}
argv[0] = path;
execv(path, (const void *)argv);
if (errno != EACCES)
weprintf("execv %s:", path);
_exit(1);
default:
/* SIGCHLD is ignored */
break;
}
#endif
}
/**
* Run hooks
*
* @param argv `NULL` terminated list of command line arguments
* for the hooks; must contain an unused initial slot,
* which the function will use to provide the zeroth
* argument
*/
static void
run_hooks(const char *argv[])
{
static int looked_up_dir = 0;
static int hook_file_is_regular = 0;
static int hook_file_checked = 0;
DIR *dir;
struct dirent *f;
size_t required;
const char *dirpath_static;
if (hook_file_is_regular) {
goto run_hook_file;
} else if (hook_file) {
if (!hook_file_checked) {
hook_file_checked = 1;
if (!strcmp(hook_file, "/dev/null") ||
!strcmp(hook_file, "/var/empty") ||
!strcmp(hook_file, "/var/empty/"))
goto no_hooks;
}
dir = opendir(hook_file);
if (!dir) {
if (errno == ENOTDIR) {
hook_file_is_regular = 1;
run_hook_file:
run_hook(hook_file, argv);
return;
}
weprintf("opendir %s:", hook_file);
no_hooks:
free(hook_file);
hook_file = NULL;
looked_up_dir = 1;
dirpath = NULL;
return;
}
} else if (!looked_up_dir) {
looked_up_dir = 1;
dir = open_hooks_dir(&dirpath_static, &dirpath);
if (!dir)
return;
if (!dirpath)
dirpath = estrdup(dirpath_static);
dirpathsize = dirpathlen = strlen(dirpath);
atexit(&cleanup);
} else if (dirpath) {
dir = opendir(dirpath);
if (!dir) {
weprintf("opendir %s:", dirpath);
cleanup();
return;
}
} else {
return;
}
while ((errno = 0, f = readdir(dir))) {
if (f->d_name[0] == '.' || !f->d_name[0] || strchr(f->d_name, '\0')[-1] == '~')
continue;
required = dirpathlen + sizeof("/") + strlen(f->d_name);
if (required > dirpathsize)
dirpath = erealloc(dirpath, dirpathsize = required);
stpcpy(stpcpy(&dirpath[dirpathlen], "/"), f->d_name);
run_hook(dirpath, argv);
dirpath[dirpathlen] = '\0';
}
if (errno)
weprintf("readdir %s:", dirpath);
closedir(dir);
}
void
run_period_change_hooks(enum period prev_period, enum period period)
{
const char *argv[] = {NULL, "period-changed", period_names[prev_period], period_names[period], NULL};
run_hooks(argv);
}
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