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Systemd/src/locale/keymap-util.c
Alan Jenkins 0675e94ab5 "Don't fear the fsync()" 
For files which are vital to boot

1. Avoid opening any window where power loss will zero them out or worse.
   I know app developers all coded to the ext3 implementation, but
   the only formal documentation we have says we're broken if we actually
   rely on it.  E.g.

   * `man mount`, search for `auto_da_alloc`.
   * http://www.linux-mtd.infradead.org/faq/ubifs.html#L_atomic_change
   * https://thunk.org/tytso/blog/2009/03/15/dont-fear-the-fsync/

2. If we tell the kernel we're interested in writing them to disk, it will
   tell us if that fails.  So at minimum, this means we play our part in
   notifying the user about errors.

I refactored error-handling in `udevadm-hwdb` a little.  It turns out I did
exactly the same as had already been done in the `systemd-hwdb` version,
i.e. commit d702dcd.
2017-08-17 20:26:36 +01:00

724 lines
23 KiB
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/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
Copyright 2013 Kay Sievers
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "def.h"
#include "env-util.h"
#include "fd-util.h"
#include "fileio-label.h"
#include "fileio.h"
#include "keymap-util.h"
#include "locale-util.h"
#include "macro.h"
#include "mkdir.h"
#include "string-util.h"
#include "strv.h"
static bool startswith_comma(const char *s, const char *prefix) {
s = startswith(s, prefix);
if (!s)
return false;
return *s == ',' || *s == '\0';
}
static const char* strnulldash(const char *s) {
return isempty(s) || streq(s, "-") ? NULL : s;
}
static const char* systemd_kbd_model_map(void) {
const char* s;
s = getenv("SYSTEMD_KBD_MODEL_MAP");
if (s)
return s;
return SYSTEMD_KBD_MODEL_MAP;
}
static const char* systemd_language_fallback_map(void) {
const char* s;
s = getenv("SYSTEMD_LANGUAGE_FALLBACK_MAP");
if (s)
return s;
return SYSTEMD_LANGUAGE_FALLBACK_MAP;
}
static void context_free_x11(Context *c) {
c->x11_layout = mfree(c->x11_layout);
c->x11_options = mfree(c->x11_options);
c->x11_model = mfree(c->x11_model);
c->x11_variant = mfree(c->x11_variant);
}
static void context_free_vconsole(Context *c) {
c->vc_keymap = mfree(c->vc_keymap);
c->vc_keymap_toggle = mfree(c->vc_keymap_toggle);
}
static void context_free_locale(Context *c) {
int p;
for (p = 0; p < _VARIABLE_LC_MAX; p++)
c->locale[p] = mfree(c->locale[p]);
}
void context_free(Context *c) {
context_free_locale(c);
context_free_x11(c);
context_free_vconsole(c);
};
void locale_simplify(Context *c) {
int p;
for (p = VARIABLE_LANG+1; p < _VARIABLE_LC_MAX; p++)
if (isempty(c->locale[p]) || streq_ptr(c->locale[VARIABLE_LANG], c->locale[p]))
c->locale[p] = mfree(c->locale[p]);
}
static int locale_read_data(Context *c) {
int r;
context_free_locale(c);
r = parse_env_file("/etc/locale.conf", NEWLINE,
"LANG", &c->locale[VARIABLE_LANG],
"LANGUAGE", &c->locale[VARIABLE_LANGUAGE],
"LC_CTYPE", &c->locale[VARIABLE_LC_CTYPE],
"LC_NUMERIC", &c->locale[VARIABLE_LC_NUMERIC],
"LC_TIME", &c->locale[VARIABLE_LC_TIME],
"LC_COLLATE", &c->locale[VARIABLE_LC_COLLATE],
"LC_MONETARY", &c->locale[VARIABLE_LC_MONETARY],
"LC_MESSAGES", &c->locale[VARIABLE_LC_MESSAGES],
"LC_PAPER", &c->locale[VARIABLE_LC_PAPER],
"LC_NAME", &c->locale[VARIABLE_LC_NAME],
"LC_ADDRESS", &c->locale[VARIABLE_LC_ADDRESS],
"LC_TELEPHONE", &c->locale[VARIABLE_LC_TELEPHONE],
"LC_MEASUREMENT", &c->locale[VARIABLE_LC_MEASUREMENT],
"LC_IDENTIFICATION", &c->locale[VARIABLE_LC_IDENTIFICATION],
NULL);
if (r == -ENOENT) {
int p;
/* Fill in what we got passed from systemd. */
for (p = 0; p < _VARIABLE_LC_MAX; p++) {
const char *name;
name = locale_variable_to_string(p);
assert(name);
r = free_and_strdup(&c->locale[p], empty_to_null(getenv(name)));
if (r < 0)
return r;
}
r = 0;
}
locale_simplify(c);
return r;
}
static int vconsole_read_data(Context *c) {
int r;
context_free_vconsole(c);
r = parse_env_file("/etc/vconsole.conf", NEWLINE,
"KEYMAP", &c->vc_keymap,
"KEYMAP_TOGGLE", &c->vc_keymap_toggle,
NULL);
if (r < 0 && r != -ENOENT)
return r;
return 0;
}
static int x11_read_data(Context *c) {
_cleanup_fclose_ FILE *f;
char line[LINE_MAX];
bool in_section = false;
int r;
context_free_x11(c);
f = fopen("/etc/X11/xorg.conf.d/00-keyboard.conf", "re");
if (!f)
return errno == ENOENT ? 0 : -errno;
while (fgets(line, sizeof(line), f)) {
char *l;
char_array_0(line);
l = strstrip(line);
if (l[0] == 0 || l[0] == '#')
continue;
if (in_section && first_word(l, "Option")) {
_cleanup_strv_free_ char **a = NULL;
r = strv_split_extract(&a, l, WHITESPACE, EXTRACT_QUOTES);
if (r < 0)
return r;
if (strv_length(a) == 3) {
char **p = NULL;
if (streq(a[1], "XkbLayout"))
p = &c->x11_layout;
else if (streq(a[1], "XkbModel"))
p = &c->x11_model;
else if (streq(a[1], "XkbVariant"))
p = &c->x11_variant;
else if (streq(a[1], "XkbOptions"))
p = &c->x11_options;
if (p) {
free(*p);
*p = a[2];
a[2] = NULL;
}
}
} else if (!in_section && first_word(l, "Section")) {
_cleanup_strv_free_ char **a = NULL;
r = strv_split_extract(&a, l, WHITESPACE, EXTRACT_QUOTES);
if (r < 0)
return -ENOMEM;
if (strv_length(a) == 2 && streq(a[1], "InputClass"))
in_section = true;
} else if (in_section && first_word(l, "EndSection"))
in_section = false;
}
return 0;
}
int context_read_data(Context *c) {
int r, q, p;
r = locale_read_data(c);
q = vconsole_read_data(c);
p = x11_read_data(c);
return r < 0 ? r : q < 0 ? q : p;
}
int locale_write_data(Context *c, char ***settings) {
int r, p;
_cleanup_strv_free_ char **l = NULL;
/* Set values will be returned as strv in *settings on success. */
r = load_env_file(NULL, "/etc/locale.conf", NULL, &l);
if (r < 0 && r != -ENOENT)
return r;
for (p = 0; p < _VARIABLE_LC_MAX; p++) {
_cleanup_free_ char *t = NULL;
char **u;
const char *name;
name = locale_variable_to_string(p);
assert(name);
if (isempty(c->locale[p])) {
l = strv_env_unset(l, name);
continue;
}
if (asprintf(&t, "%s=%s", name, c->locale[p]) < 0)
return -ENOMEM;
u = strv_env_set(l, t);
if (!u)
return -ENOMEM;
strv_free(l);
l = u;
}
if (strv_isempty(l)) {
if (unlink("/etc/locale.conf") < 0)
return errno == ENOENT ? 0 : -errno;
return 0;
}
r = write_env_file_label("/etc/locale.conf", l);
if (r < 0)
return r;
*settings = l;
l = NULL;
return 0;
}
int vconsole_write_data(Context *c) {
int r;
_cleanup_strv_free_ char **l = NULL;
r = load_env_file(NULL, "/etc/vconsole.conf", NULL, &l);
if (r < 0 && r != -ENOENT)
return r;
if (isempty(c->vc_keymap))
l = strv_env_unset(l, "KEYMAP");
else {
_cleanup_free_ char *s = NULL;
char **u;
s = strappend("KEYMAP=", c->vc_keymap);
if (!s)
return -ENOMEM;
u = strv_env_set(l, s);
if (!u)
return -ENOMEM;
strv_free(l);
l = u;
}
if (isempty(c->vc_keymap_toggle))
l = strv_env_unset(l, "KEYMAP_TOGGLE");
else {
_cleanup_free_ char *s = NULL;
char **u;
s = strappend("KEYMAP_TOGGLE=", c->vc_keymap_toggle);
if (!s)
return -ENOMEM;
u = strv_env_set(l, s);
if (!u)
return -ENOMEM;
strv_free(l);
l = u;
}
if (strv_isempty(l)) {
if (unlink("/etc/vconsole.conf") < 0)
return errno == ENOENT ? 0 : -errno;
return 0;
}
return write_env_file_label("/etc/vconsole.conf", l);
}
int x11_write_data(Context *c) {
_cleanup_fclose_ FILE *f = NULL;
_cleanup_free_ char *temp_path = NULL;
int r;
if (isempty(c->x11_layout) &&
isempty(c->x11_model) &&
isempty(c->x11_variant) &&
isempty(c->x11_options)) {
if (unlink("/etc/X11/xorg.conf.d/00-keyboard.conf") < 0)
return errno == ENOENT ? 0 : -errno;
return 0;
}
mkdir_p_label("/etc/X11/xorg.conf.d", 0755);
r = fopen_temporary("/etc/X11/xorg.conf.d/00-keyboard.conf", &f, &temp_path);
if (r < 0)
return r;
fchmod(fileno(f), 0644);
fputs_unlocked("# Written by systemd-localed(8), read by systemd-localed and Xorg. It's\n"
"# probably wise not to edit this file manually. Use localectl(1) to\n"
"# instruct systemd-localed to update it.\n"
"Section \"InputClass\"\n"
" Identifier \"system-keyboard\"\n"
" MatchIsKeyboard \"on\"\n", f);
if (!isempty(c->x11_layout))
fprintf(f, " Option \"XkbLayout\" \"%s\"\n", c->x11_layout);
if (!isempty(c->x11_model))
fprintf(f, " Option \"XkbModel\" \"%s\"\n", c->x11_model);
if (!isempty(c->x11_variant))
fprintf(f, " Option \"XkbVariant\" \"%s\"\n", c->x11_variant);
if (!isempty(c->x11_options))
fprintf(f, " Option \"XkbOptions\" \"%s\"\n", c->x11_options);
fputs_unlocked("EndSection\n", f);
r = fflush_sync_and_check(f);
if (r < 0)
goto fail;
if (rename(temp_path, "/etc/X11/xorg.conf.d/00-keyboard.conf") < 0) {
r = -errno;
goto fail;
}
return 0;
fail:
if (temp_path)
(void) unlink(temp_path);
return r;
}
static int read_next_mapping(const char* filename,
unsigned min_fields, unsigned max_fields,
FILE *f, unsigned *n, char ***a) {
assert(f);
assert(n);
assert(a);
for (;;) {
char line[LINE_MAX];
char *l, **b;
int r;
size_t length;
errno = 0;
if (!fgets(line, sizeof(line), f)) {
if (ferror(f))
return errno > 0 ? -errno : -EIO;
return 0;
}
(*n)++;
l = strstrip(line);
if (l[0] == 0 || l[0] == '#')
continue;
r = strv_split_extract(&b, l, WHITESPACE, EXTRACT_QUOTES);
if (r < 0)
return r;
length = strv_length(b);
if (length < min_fields || length > max_fields) {
log_error("Invalid line %s:%u, ignoring.", filename, *n);
strv_free(b);
continue;
}
*a = b;
return 1;
}
}
int vconsole_convert_to_x11(Context *c) {
const char *map;
int modified = -1;
map = systemd_kbd_model_map();
if (isempty(c->vc_keymap)) {
modified =
!isempty(c->x11_layout) ||
!isempty(c->x11_model) ||
!isempty(c->x11_variant) ||
!isempty(c->x11_options);
context_free_x11(c);
} else {
_cleanup_fclose_ FILE *f = NULL;
unsigned n = 0;
f = fopen(map, "re");
if (!f)
return -errno;
for (;;) {
_cleanup_strv_free_ char **a = NULL;
int r;
r = read_next_mapping(map, 5, UINT_MAX, f, &n, &a);
if (r < 0)
return r;
if (r == 0)
break;
if (!streq(c->vc_keymap, a[0]))
continue;
if (!streq_ptr(c->x11_layout, strnulldash(a[1])) ||
!streq_ptr(c->x11_model, strnulldash(a[2])) ||
!streq_ptr(c->x11_variant, strnulldash(a[3])) ||
!streq_ptr(c->x11_options, strnulldash(a[4]))) {
if (free_and_strdup(&c->x11_layout, strnulldash(a[1])) < 0 ||
free_and_strdup(&c->x11_model, strnulldash(a[2])) < 0 ||
free_and_strdup(&c->x11_variant, strnulldash(a[3])) < 0 ||
free_and_strdup(&c->x11_options, strnulldash(a[4])) < 0)
return -ENOMEM;
modified = true;
}
break;
}
}
if (modified > 0)
log_info("Changing X11 keyboard layout to '%s' model '%s' variant '%s' options '%s'",
strempty(c->x11_layout),
strempty(c->x11_model),
strempty(c->x11_variant),
strempty(c->x11_options));
else if (modified < 0)
log_notice("X11 keyboard layout was not modified: no conversion found for \"%s\".",
c->vc_keymap);
else
log_debug("X11 keyboard layout did not need to be modified.");
return modified > 0;
}
int find_converted_keymap(const char *x11_layout, const char *x11_variant, char **new_keymap) {
const char *dir;
_cleanup_free_ char *n;
if (x11_variant)
n = strjoin(x11_layout, "-", x11_variant);
else
n = strdup(x11_layout);
if (!n)
return -ENOMEM;
NULSTR_FOREACH(dir, KBD_KEYMAP_DIRS) {
_cleanup_free_ char *p = NULL, *pz = NULL;
bool uncompressed;
p = strjoin(dir, "xkb/", n, ".map");
pz = strjoin(dir, "xkb/", n, ".map.gz");
if (!p || !pz)
return -ENOMEM;
uncompressed = access(p, F_OK) == 0;
if (uncompressed || access(pz, F_OK) == 0) {
log_debug("Found converted keymap %s at %s",
n, uncompressed ? p : pz);
*new_keymap = n;
n = NULL;
return 1;
}
}
return 0;
}
int find_legacy_keymap(Context *c, char **new_keymap) {
const char *map;
_cleanup_fclose_ FILE *f = NULL;
unsigned n = 0;
unsigned best_matching = 0;
int r;
assert(!isempty(c->x11_layout));
map = systemd_kbd_model_map();
f = fopen(map, "re");
if (!f)
return -errno;
for (;;) {
_cleanup_strv_free_ char **a = NULL;
unsigned matching = 0;
r = read_next_mapping(map, 5, UINT_MAX, f, &n, &a);
if (r < 0)
return r;
if (r == 0)
break;
/* Determine how well matching this entry is */
if (streq(c->x11_layout, a[1]))
/* If we got an exact match, this is best */
matching = 10;
else {
/* We have multiple X layouts, look for an
* entry that matches our key with everything
* but the first layout stripped off. */
if (startswith_comma(c->x11_layout, a[1]))
matching = 5;
else {
char *x;
/* If that didn't work, strip off the
* other layouts from the entry, too */
x = strndupa(a[1], strcspn(a[1], ","));
if (startswith_comma(c->x11_layout, x))
matching = 1;
}
}
if (matching > 0) {
if (isempty(c->x11_model) || streq_ptr(c->x11_model, a[2])) {
matching++;
if (streq_ptr(c->x11_variant, a[3])) {
matching++;
if (streq_ptr(c->x11_options, a[4]))
matching++;
}
}
}
/* The best matching entry so far, then let's save that */
if (matching >= MAX(best_matching, 1u)) {
log_debug("Found legacy keymap %s with score %u",
a[0], matching);
if (matching > best_matching) {
best_matching = matching;
r = free_and_strdup(new_keymap, a[0]);
if (r < 0)
return r;
}
}
}
if (best_matching < 10 && c->x11_layout) {
/* The best match is only the first part of the X11
* keymap. Check if we have a converted map which
* matches just the first layout.
*/
char *l, *v = NULL, *converted;
l = strndupa(c->x11_layout, strcspn(c->x11_layout, ","));
if (c->x11_variant)
v = strndupa(c->x11_variant, strcspn(c->x11_variant, ","));
r = find_converted_keymap(l, v, &converted);
if (r < 0)
return r;
if (r > 0) {
free(*new_keymap);
*new_keymap = converted;
}
}
return (bool) *new_keymap;
}
int find_language_fallback(const char *lang, char **language) {
const char *map;
_cleanup_fclose_ FILE *f = NULL;
unsigned n = 0;
assert(lang);
assert(language);
map = systemd_language_fallback_map();
f = fopen(map, "re");
if (!f)
return -errno;
for (;;) {
_cleanup_strv_free_ char **a = NULL;
int r;
r = read_next_mapping(map, 2, 2, f, &n, &a);
if (r <= 0)
return r;
if (streq(lang, a[0])) {
assert(strv_length(a) == 2);
*language = a[1];
a[1] = NULL;
return 1;
}
}
assert_not_reached("should not be here");
}
int x11_convert_to_vconsole(Context *c) {
bool modified = false;
if (isempty(c->x11_layout)) {
modified =
!isempty(c->vc_keymap) ||
!isempty(c->vc_keymap_toggle);
context_free_vconsole(c);
} else {
char *new_keymap = NULL;
int r;
r = find_converted_keymap(c->x11_layout, c->x11_variant, &new_keymap);
if (r < 0)
return r;
else if (r == 0) {
r = find_legacy_keymap(c, &new_keymap);
if (r < 0)
return r;
}
if (r == 0)
/* We search for layout-variant match first, but then we also look
* for anything which matches just the layout. So it's accurate to say
* that we couldn't find anything which matches the layout. */
log_notice("No conversion to virtual console map found for \"%s\".",
c->x11_layout);
if (!streq_ptr(c->vc_keymap, new_keymap)) {
free(c->vc_keymap);
c->vc_keymap = new_keymap;
c->vc_keymap_toggle = mfree(c->vc_keymap_toggle);
modified = true;
} else
free(new_keymap);
}
if (modified)
log_info("Changing virtual console keymap to '%s' toggle '%s'",
strempty(c->vc_keymap), strempty(c->vc_keymap_toggle));
else
log_debug("Virtual console keymap was not modified.");
return modified;
}
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