Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1161 insertions, 0 deletions

diff --git a/src/locale/localed-util.c b/src/locale/localed-util.c
new file mode 100644
index 0000000..e4e57a0
--- /dev/null
+++ b/src/locale/localed-util.c
@@ -0,0 +1,1161 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "bus-polkit.h"
+#include "copy.h"
+#include "env-file-label.h"
+#include "env-file.h"
+#include "env-util.h"
+#include "fd-util.h"
+#include "fileio-label.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "kbd-util.h"
+#include "localed-util.h"
+#include "macro.h"
+#include "mkdir-label.h"
+#include "nulstr-util.h"
+#include "process-util.h"
+#include "stat-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "tmpfile-util.h"
+#include "xkbcommon-util.h"
+
+static bool startswith_comma(const char *s, const char *prefix) {
+        assert(s);
+        assert(prefix);
+
+        s = startswith(s, prefix);
+        if (!s)
+                return false;
+
+        return IN_SET(*s, ',', '\0');
+}
+
+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;
+}
+
+void x11_context_clear(X11Context *xc) {
+        assert(xc);
+
+        xc->layout  = mfree(xc->layout);
+        xc->options = mfree(xc->options);
+        xc->model   = mfree(xc->model);
+        xc->variant = mfree(xc->variant);
+}
+
+void x11_context_replace(X11Context *dest, X11Context *src) {
+        assert(dest);
+        assert(src);
+
+        x11_context_clear(dest);
+        *dest = TAKE_STRUCT(*src);
+}
+
+bool x11_context_isempty(const X11Context *xc) {
+        assert(xc);
+
+        return
+                isempty(xc->layout)  &&
+                isempty(xc->model)   &&
+                isempty(xc->variant) &&
+                isempty(xc->options);
+}
+
+void x11_context_empty_to_null(X11Context *xc) {
+        assert(xc);
+
+        /* Do not call x11_context_clear() for the passed object. */
+
+        xc->layout  = empty_to_null(xc->layout);
+        xc->model   = empty_to_null(xc->model);
+        xc->variant = empty_to_null(xc->variant);
+        xc->options = empty_to_null(xc->options);
+}
+
+bool x11_context_is_safe(const X11Context *xc) {
+        assert(xc);
+
+        return
+                (!xc->layout  || string_is_safe(xc->layout))  &&
+                (!xc->model   || string_is_safe(xc->model))   &&
+                (!xc->variant || string_is_safe(xc->variant)) &&
+                (!xc->options || string_is_safe(xc->options));
+}
+
+bool x11_context_equal(const X11Context *a, const X11Context *b) {
+        assert(a);
+        assert(b);
+
+        return
+                streq_ptr(a->layout,  b->layout)  &&
+                streq_ptr(a->model,   b->model)   &&
+                streq_ptr(a->variant, b->variant) &&
+                streq_ptr(a->options, b->options);
+}
+
+int x11_context_copy(X11Context *dest, const X11Context *src) {
+        bool modified;
+        int r;
+
+        assert(dest);
+
+        if (dest == src)
+                return 0;
+
+        if (!src) {
+                modified = !x11_context_isempty(dest);
+                x11_context_clear(dest);
+                return modified;
+        }
+
+        r = free_and_strdup(&dest->layout, src->layout);
+        if (r < 0)
+                return r;
+        modified = r > 0;
+
+        r = free_and_strdup(&dest->model, src->model);
+        if (r < 0)
+                return r;
+        modified = modified || r > 0;
+
+        r = free_and_strdup(&dest->variant, src->variant);
+        if (r < 0)
+                return r;
+        modified = modified || r > 0;
+
+        r = free_and_strdup(&dest->options, src->options);
+        if (r < 0)
+                return r;
+        modified = modified || r > 0;
+
+        return modified;
+}
+
+int x11_context_verify_and_warn(const X11Context *xc, int log_level, sd_bus_error *error) {
+        int r;
+
+        assert(xc);
+
+        if (!x11_context_is_safe(xc)) {
+                if (error)
+                        sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid X11 keyboard layout.");
+                return log_full_errno(log_level, SYNTHETIC_ERRNO(EINVAL), "Invalid X11 keyboard layout.");
+        }
+
+        r = verify_xkb_rmlvo(xc->model, xc->layout, xc->variant, xc->options);
+        if (r == -EOPNOTSUPP) {
+                log_full_errno(MAX(log_level, LOG_NOTICE), r,
+                               "Cannot verify if new keymap is correct, libxkbcommon.so unavailable.");
+                return 0;
+        }
+        if (r < 0) {
+                if (error)
+                        sd_bus_error_set_errnof(error, r, "Specified keymap cannot be compiled, refusing as invalid.");
+                return log_full_errno(log_level, r,
+                                      "Cannot compile XKB keymap for x11 keyboard layout "
+                                      "(model='%s' / layout='%s' / variant='%s' / options='%s'): %m",
+                                      strempty(xc->model), strempty(xc->layout), strempty(xc->variant), strempty(xc->options));
+        }
+
+        return 0;
+}
+
+void vc_context_clear(VCContext *vc) {
+        assert(vc);
+
+        vc->keymap = mfree(vc->keymap);
+        vc->toggle = mfree(vc->toggle);
+}
+
+void vc_context_replace(VCContext *dest, VCContext *src) {
+        assert(dest);
+        assert(src);
+
+        vc_context_clear(dest);
+        *dest = TAKE_STRUCT(*src);
+}
+
+bool vc_context_isempty(const VCContext *vc) {
+        assert(vc);
+
+        return
+                isempty(vc->keymap) &&
+                isempty(vc->toggle);
+}
+
+void vc_context_empty_to_null(VCContext *vc) {
+        assert(vc);
+
+        /* Do not call vc_context_clear() for the passed object. */
+
+        vc->keymap = empty_to_null(vc->keymap);
+        vc->toggle = empty_to_null(vc->toggle);
+}
+
+bool vc_context_equal(const VCContext *a, const VCContext *b) {
+        assert(a);
+        assert(b);
+
+        return
+                streq_ptr(a->keymap, b->keymap) &&
+                streq_ptr(a->toggle, b->toggle);
+}
+
+int vc_context_copy(VCContext *dest, const VCContext *src) {
+        bool modified;
+        int r;
+
+        assert(dest);
+
+        if (dest == src)
+                return 0;
+
+        if (!src) {
+                modified = !vc_context_isempty(dest);
+                vc_context_clear(dest);
+                return modified;
+        }
+
+        r = free_and_strdup(&dest->keymap, src->keymap);
+        if (r < 0)
+                return r;
+        modified = r > 0;
+
+        r = free_and_strdup(&dest->toggle, src->toggle);
+        if (r < 0)
+                return r;
+        modified = modified || r > 0;
+
+        return modified;
+}
+
+static int verify_keymap(const char *keymap, int log_level, sd_bus_error *error) {
+        int r;
+
+        assert(keymap);
+
+        r = keymap_exists(keymap); /* This also verifies that the keymap name is kosher. */
+        if (r < 0) {
+                if (error)
+                        sd_bus_error_set_errnof(error, r, "Failed to check keymap %s: %m", keymap);
+                return log_full_errno(log_level, r, "Failed to check keymap %s: %m", keymap);
+        }
+        if (r == 0) {
+                if (error)
+                        sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Keymap %s is not installed.", keymap);
+                return log_full_errno(log_level, SYNTHETIC_ERRNO(ENOENT), "Keymap %s is not installed.", keymap);
+        }
+
+        return 0;
+}
+
+int vc_context_verify_and_warn(const VCContext *vc, int log_level, sd_bus_error *error) {
+        int r;
+
+        assert(vc);
+
+        if (vc->keymap) {
+                r = verify_keymap(vc->keymap, log_level, error);
+                if (r < 0)
+                        return r;
+        }
+
+        if (vc->toggle) {
+                r = verify_keymap(vc->toggle, log_level, error);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
+void context_clear(Context *c) {
+        assert(c);
+
+        locale_context_clear(&c->locale_context);
+        x11_context_clear(&c->x11_from_xorg);
+        x11_context_clear(&c->x11_from_vc);
+        vc_context_clear(&c->vc);
+
+        c->locale_cache = sd_bus_message_unref(c->locale_cache);
+        c->x11_cache = sd_bus_message_unref(c->x11_cache);
+        c->vc_cache = sd_bus_message_unref(c->vc_cache);
+
+        c->polkit_registry = bus_verify_polkit_async_registry_free(c->polkit_registry);
+};
+
+X11Context *context_get_x11_context(Context *c) {
+        assert(c);
+
+        if (!x11_context_isempty(&c->x11_from_vc))
+                return &c->x11_from_vc;
+
+        if (!x11_context_isempty(&c->x11_from_xorg))
+                return &c->x11_from_xorg;
+
+        return &c->x11_from_vc;
+}
+
+int locale_read_data(Context *c, sd_bus_message *m) {
+        assert(c);
+
+        /* Do not try to re-read the file within single bus operation. */
+        if (m) {
+                if (m == c->locale_cache)
+                        return 0;
+
+                sd_bus_message_unref(c->locale_cache);
+                c->locale_cache = sd_bus_message_ref(m);
+        }
+
+        return locale_context_load(&c->locale_context, LOCALE_LOAD_LOCALE_CONF | LOCALE_LOAD_ENVIRONMENT | LOCALE_LOAD_SIMPLIFY);
+}
+
+int vconsole_read_data(Context *c, sd_bus_message *m) {
+        _cleanup_close_ int fd = -EBADF;
+        struct stat st;
+        int r;
+
+        assert(c);
+
+        /* Do not try to re-read the file within single bus operation. */
+        if (m) {
+                if (m == c->vc_cache)
+                        return 0;
+
+                sd_bus_message_unref(c->vc_cache);
+                c->vc_cache = sd_bus_message_ref(m);
+        }
+
+        fd = RET_NERRNO(open("/etc/vconsole.conf", O_CLOEXEC | O_PATH));
+        if (fd == -ENOENT) {
+                c->vc_stat = (struct stat) {};
+                vc_context_clear(&c->vc);
+                x11_context_clear(&c->x11_from_vc);
+                return 0;
+        }
+        if (fd < 0)
+                return fd;
+
+        if (fstat(fd, &st) < 0)
+                return -errno;
+
+        /* If the file is not changed, then we do not need to re-read */
+        if (stat_inode_unmodified(&c->vc_stat, &st))
+                return 0;
+
+        c->vc_stat = st;
+        vc_context_clear(&c->vc);
+        x11_context_clear(&c->x11_from_vc);
+
+        r = parse_env_file_fd(
+                        fd, "/etc/vconsole.conf",
+                        "KEYMAP",        &c->vc.keymap,
+                        "KEYMAP_TOGGLE", &c->vc.toggle,
+                        "XKBLAYOUT",     &c->x11_from_vc.layout,
+                        "XKBMODEL",      &c->x11_from_vc.model,
+                        "XKBVARIANT",    &c->x11_from_vc.variant,
+                        "XKBOPTIONS",    &c->x11_from_vc.options);
+        if (r < 0)
+                return r;
+
+        if (vc_context_verify(&c->vc) < 0)
+                vc_context_clear(&c->vc);
+
+        if (x11_context_verify(&c->x11_from_vc) < 0)
+                x11_context_clear(&c->x11_from_vc);
+
+        return 0;
+}
+
+int x11_read_data(Context *c, sd_bus_message *m) {
+        _cleanup_close_ int fd = -EBADF;
+        _cleanup_fclose_ FILE *f = NULL;
+        bool in_section = false;
+        struct stat st;
+        int r;
+
+        assert(c);
+
+        /* Do not try to re-read the file within single bus operation. */
+        if (m) {
+                if (m == c->x11_cache)
+                        return 0;
+
+                sd_bus_message_unref(c->x11_cache);
+                c->x11_cache = sd_bus_message_ref(m);
+        }
+
+        fd = RET_NERRNO(open("/etc/X11/xorg.conf.d/00-keyboard.conf", O_CLOEXEC | O_PATH));
+        if (fd == -ENOENT) {
+                c->x11_stat = (struct stat) {};
+                x11_context_clear(&c->x11_from_xorg);
+                return 0;
+        }
+        if (fd < 0)
+                return fd;
+
+        if (fstat(fd, &st) < 0)
+                return -errno;
+
+        /* If the file is not changed, then we do not need to re-read */
+        if (stat_inode_unmodified(&c->x11_stat, &st))
+                return 0;
+
+        c->x11_stat = st;
+        x11_context_clear(&c->x11_from_xorg);
+
+        r = fdopen_independent(fd, "re", &f);
+        if (r < 0)
+                return r;
+
+        for (;;) {
+                _cleanup_free_ char *line = NULL;
+
+                r = read_stripped_line(f, LONG_LINE_MAX, &line);
+                if (r < 0)
+                        return r;
+                if (r == 0)
+                        break;
+
+                if (IN_SET(line[0], 0, '#'))
+                        continue;
+
+                if (in_section && first_word(line, "Option")) {
+                        _cleanup_strv_free_ char **a = NULL;
+
+                        r = strv_split_full(&a, line, WHITESPACE, EXTRACT_UNQUOTE);
+                        if (r < 0)
+                                return r;
+
+                        if (strv_length(a) == 3) {
+                                char **p = NULL;
+
+                                if (streq(a[1], "XkbLayout"))
+                                        p = &c->x11_from_xorg.layout;
+                                else if (streq(a[1], "XkbModel"))
+                                        p = &c->x11_from_xorg.model;
+                                else if (streq(a[1], "XkbVariant"))
+                                        p = &c->x11_from_xorg.variant;
+                                else if (streq(a[1], "XkbOptions"))
+                                        p = &c->x11_from_xorg.options;
+
+                                if (p)
+                                        free_and_replace(*p, a[2]);
+                        }
+
+                } else if (!in_section && first_word(line, "Section")) {
+                        _cleanup_strv_free_ char **a = NULL;
+
+                        r = strv_split_full(&a, line, WHITESPACE, EXTRACT_UNQUOTE);
+                        if (r < 0)
+                                return -ENOMEM;
+
+                        if (strv_length(a) == 2 && streq(a[1], "InputClass"))
+                                in_section = true;
+
+                } else if (in_section && first_word(line, "EndSection"))
+                        in_section = false;
+        }
+
+        if (x11_context_verify(&c->x11_from_xorg) < 0)
+                x11_context_clear(&c->x11_from_xorg);
+
+        return 0;
+}
+
+int vconsole_write_data(Context *c) {
+        _cleanup_strv_free_ char **l = NULL;
+        const X11Context *xc;
+        int r;
+
+        assert(c);
+
+        xc = context_get_x11_context(c);
+
+        r = load_env_file(NULL, "/etc/vconsole.conf", &l);
+        if (r < 0 && r != -ENOENT)
+                return r;
+
+        r = strv_env_assign(&l, "KEYMAP", empty_to_null(c->vc.keymap));
+        if (r < 0)
+                return r;
+
+        r = strv_env_assign(&l, "KEYMAP_TOGGLE", empty_to_null(c->vc.toggle));
+        if (r < 0)
+                return r;
+
+        r = strv_env_assign(&l, "XKBLAYOUT", empty_to_null(xc->layout));
+        if (r < 0)
+                return r;
+
+        r = strv_env_assign(&l, "XKBMODEL", empty_to_null(xc->model));
+        if (r < 0)
+                return r;
+
+        r = strv_env_assign(&l, "XKBVARIANT", empty_to_null(xc->variant));
+        if (r < 0)
+                return r;
+
+        r = strv_env_assign(&l, "XKBOPTIONS", empty_to_null(xc->options));
+        if (r < 0)
+                return r;
+
+        if (strv_isempty(l)) {
+                if (unlink("/etc/vconsole.conf") < 0)
+                        return errno == ENOENT ? 0 : -errno;
+
+                c->vc_stat = (struct stat) {};
+                return 0;
+        }
+
+        r = write_vconsole_conf_label(l);
+        if (r < 0)
+                return r;
+
+        if (stat("/etc/vconsole.conf", &c->vc_stat) < 0)
+                return -errno;
+
+        return 0;
+}
+
+int x11_write_data(Context *c) {
+        _cleanup_fclose_ FILE *f = NULL;
+        _cleanup_(unlink_and_freep) char *temp_path = NULL;
+        const X11Context *xc;
+        int r;
+
+        assert(c);
+
+        xc = context_get_x11_context(c);
+        if (x11_context_isempty(xc)) {
+                if (unlink("/etc/X11/xorg.conf.d/00-keyboard.conf") < 0)
+                        return errno == ENOENT ? 0 : -errno;
+
+                c->x11_stat = (struct stat) {};
+                return 0;
+        }
+
+        (void) 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;
+
+        (void) fchmod(fileno(f), 0644);
+
+        fputs("# 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"
+              "# update this file.\n"
+              "Section \"InputClass\"\n"
+              "        Identifier \"system-keyboard\"\n"
+              "        MatchIsKeyboard \"on\"\n", f);
+
+        if (!isempty(xc->layout))
+                fprintf(f, "        Option \"XkbLayout\" \"%s\"\n", xc->layout);
+
+        if (!isempty(xc->model))
+                fprintf(f, "        Option \"XkbModel\" \"%s\"\n", xc->model);
+
+        if (!isempty(xc->variant))
+                fprintf(f, "        Option \"XkbVariant\" \"%s\"\n", xc->variant);
+
+        if (!isempty(xc->options))
+                fprintf(f, "        Option \"XkbOptions\" \"%s\"\n", xc->options);
+
+        fputs("EndSection\n", f);
+
+        r = fflush_sync_and_check(f);
+        if (r < 0)
+                return r;
+
+        if (rename(temp_path, "/etc/X11/xorg.conf.d/00-keyboard.conf") < 0)
+                return -errno;
+
+        if (stat("/etc/X11/xorg.conf.d/00-keyboard.conf", &c->x11_stat) < 0)
+                return -errno;
+
+        return 0;
+}
+
+static int read_next_mapping(
+                const char *filename,
+                unsigned min_fields,
+                unsigned max_fields,
+                FILE *f,
+                unsigned *n,
+                char ***ret) {
+
+        assert(f);
+        assert(n);
+        assert(ret);
+
+        for (;;) {
+                _cleanup_strv_free_ char **b = NULL;
+                _cleanup_free_ char *line = NULL;
+                size_t length;
+                int r;
+
+                r = read_stripped_line(f, LONG_LINE_MAX, &line);
+                if (r < 0)
+                        return r;
+                if (r == 0)
+                        break;
+
+                (*n)++;
+
+                if (IN_SET(line[0], 0, '#'))
+                        continue;
+
+                r = strv_split_full(&b, line, WHITESPACE, EXTRACT_UNQUOTE);
+                if (r < 0)
+                        return r;
+
+                length = strv_length(b);
+                if (length < min_fields || length > max_fields) {
+                        log_debug("Invalid line %s:%u, ignoring.", strna(filename), *n);
+                        continue;
+
+                }
+
+                *ret = TAKE_PTR(b);
+                return 1;
+        }
+
+        *ret = NULL;
+        return 0;
+}
+
+int vconsole_convert_to_x11(const VCContext *vc, X11Context *ret) {
+        _cleanup_fclose_ FILE *f = NULL;
+        const char *map;
+        X11Context xc;
+        int r;
+
+        assert(vc);
+        assert(ret);
+
+        if (isempty(vc->keymap)) {
+                *ret = (X11Context) {};
+                return 0;
+        }
+
+        map = systemd_kbd_model_map();
+        f = fopen(map, "re");
+        if (!f)
+                return -errno;
+
+        for (unsigned n = 0;;) {
+                _cleanup_strv_free_ char **a = NULL;
+
+                r = read_next_mapping(map, 5, UINT_MAX, f, &n, &a);
+                if (r < 0)
+                        return r;
+                if (r == 0)
+                        break;
+
+                if (!streq(vc->keymap, a[0]))
+                        continue;
+
+                xc = (X11Context) {
+                        .layout  = empty_or_dash_to_null(a[1]),
+                        .model   = empty_or_dash_to_null(a[2]),
+                        .variant = empty_or_dash_to_null(a[3]),
+                        .options = empty_or_dash_to_null(a[4]),
+                };
+
+                if (x11_context_verify(&xc) < 0)
+                        continue;
+
+                return x11_context_copy(ret, &xc);
+        }
+
+        /* No custom mapping has been found, see if the keymap is a converted one. In such case deducing the
+         * corresponding x11 layout is easy. */
+        _cleanup_free_ char *xlayout = NULL, *converted = NULL;
+        char *xvariant;
+
+        xlayout = strdup(vc->keymap);
+        if (!xlayout)
+                return -ENOMEM;
+        xvariant = strchr(xlayout, '-');
+        if (xvariant) {
+                xvariant[0] = '\0';
+                xvariant++;
+        }
+
+        /* Note: by default we use keyboard model "microsoftpro" which should be equivalent to "pc105" but
+         * with the internet/media key mapping added. */
+        xc = (X11Context) {
+                .layout  = xlayout,
+                .model   = (char*) "microsoftpro",
+                .variant = xvariant,
+                .options = (char*) "terminate:ctrl_alt_bksp",
+        };
+
+        /* This sanity check seems redundant with the verification of the X11 layout done on the next
+         * step. However xkbcommon is an optional dependency hence the verification might be a NOP.  */
+        r = find_converted_keymap(&xc, &converted);
+        if (r == 0 && xc.variant) {
+                /* If we still haven't find a match, try with no variant, it's still better than nothing.  */
+                xc.variant = NULL;
+                r = find_converted_keymap(&xc, &converted);
+        }
+        if (r < 0)
+                return r;
+
+        if (r == 0 || x11_context_verify(&xc) < 0) {
+                *ret = (X11Context) {};
+                return 0;
+        }
+
+        return x11_context_copy(ret, &xc);
+}
+
+int find_converted_keymap(const X11Context *xc, char **ret) {
+        _cleanup_free_ char *n = NULL;
+
+        assert(xc);
+        assert(!isempty(xc->layout));
+        assert(ret);
+
+        if (xc->variant)
+                n = strjoin(xc->layout, "-", xc->variant);
+        else
+                n = strdup(xc->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);
+                        *ret = TAKE_PTR(n);
+                        return 1;
+                }
+        }
+
+        *ret = NULL;
+        return 0;
+}
+
+int find_legacy_keymap(const X11Context *xc, char **ret) {
+        const char *map;
+        _cleanup_fclose_ FILE *f = NULL;
+        _cleanup_free_ char *new_keymap = NULL;
+        unsigned best_matching = 0;
+        int r;
+
+        assert(xc);
+        assert(!isempty(xc->layout));
+
+        map = systemd_kbd_model_map();
+        f = fopen(map, "re");
+        if (!f)
+                return -errno;
+
+        for (unsigned n = 0;;) {
+                _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(xc->layout, a[1]))
+                        /* If we got an exact match, this is the best */
+                        matching = 10;
+                else {
+                        /* see if we get an exact match with the order reversed */
+                        _cleanup_strv_free_ char **b = NULL;
+                        _cleanup_free_ char *c = NULL;
+                        r = strv_split_full(&b, a[1], ",", 0);
+                        if (r < 0)
+                                return r;
+                        strv_reverse(b);
+                        c = strv_join(b, ",");
+                        if (!c)
+                                return log_oom();
+                        if (streq(xc->layout, c))
+                                matching = 9;
+                        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(xc->layout, a[1]))
+                                        matching = 5;
+                                else {
+                                        _cleanup_free_ char *x = NULL;
+
+                                        /* If that didn't work, strip off the
+                                         * other layouts from the entry, too */
+                                        x = strdupcspn(a[1], ",");
+                                        if (!x)
+                                                return -ENOMEM;
+                                        if (startswith_comma(xc->layout, x))
+                                                matching = 1;
+                                }
+                        }
+                }
+
+                if (matching > 0) {
+                        if (isempty(xc->model) || streq_ptr(xc->model, a[2])) {
+                                matching++;
+
+                                if (streq_ptr(xc->variant, a[3]) || ((isempty(xc->variant) || streq_skip_trailing_chars(xc->variant, "", ",")) && streq(a[3], "-"))) {
+                                        matching++;
+
+                                        if (streq_ptr(xc->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 < 9 && !isempty(xc->layout)) {
+                _cleanup_free_ char *l = NULL, *v = NULL, *converted = NULL;
+
+                /* 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.
+                 */
+
+                l = strdupcspn(xc->layout, ",");
+                if (!l)
+                        return -ENOMEM;
+
+                if (!isempty(xc->variant)) {
+                        v = strdupcspn(xc->variant, ",");
+                        if (!v)
+                                return -ENOMEM;
+                }
+
+                r = find_converted_keymap(
+                                &(X11Context) {
+                                        .layout = l,
+                                        .variant = v,
+                                },
+                                &converted);
+                if (r < 0)
+                        return r;
+                if (r > 0)
+                        free_and_replace(new_keymap, converted);
+        }
+
+        *ret = TAKE_PTR(new_keymap);
+        return !!*ret;
+}
+
+int x11_convert_to_vconsole(const X11Context *xc, VCContext *ret) {
+        _cleanup_free_ char *keymap = NULL;
+        int r;
+
+        assert(xc);
+        assert(ret);
+
+        if (isempty(xc->layout)) {
+                *ret = (VCContext) {};
+                return 0;
+        }
+
+        r = find_converted_keymap(xc, &keymap);
+        if (r == 0) {
+                r = find_legacy_keymap(xc, &keymap);
+                if (r == 0 && xc->variant)
+                        /* If we still haven't find a match, try with no variant, it's still better than
+                         * nothing.  */
+                        r = find_converted_keymap(
+                                        &(X11Context) {
+                                                .layout = xc->layout,
+                                        },
+                                        &keymap);
+        }
+        if (r < 0)
+                return r;
+
+        *ret = (VCContext) {
+                .keymap = TAKE_PTR(keymap),
+        };
+        return 0;
+}
+
+int find_language_fallback(const char *lang, char **ret) {
+        const char *map;
+        _cleanup_fclose_ FILE *f = NULL;
+        unsigned n = 0;
+        int r;
+
+        assert(lang);
+        assert(ret);
+
+        map = systemd_language_fallback_map();
+        f = fopen(map, "re");
+        if (!f)
+                return -errno;
+
+        for (;;) {
+                _cleanup_strv_free_ char **a = NULL;
+
+                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);
+                        *ret = TAKE_PTR(a[1]);
+                        return 1;
+                }
+        }
+}
+
+bool locale_gen_check_available(void) {
+#if HAVE_LOCALEGEN
+        if (access(LOCALEGEN_PATH, X_OK) < 0) {
+                if (errno != ENOENT)
+                        log_warning_errno(errno, "Unable to determine whether " LOCALEGEN_PATH " exists and is executable, assuming it is not: %m");
+                return false;
+        }
+        if (access("/etc/locale.gen", F_OK) < 0) {
+                if (errno != ENOENT)
+                        log_warning_errno(errno, "Unable to determine whether /etc/locale.gen exists, assuming it does not: %m");
+                return false;
+        }
+        return true;
+#else
+        return false;
+#endif
+}
+
+#if HAVE_LOCALEGEN
+static bool locale_encoding_is_utf8_or_unspecified(const char *locale) {
+        const char *c = strchr(locale, '.');
+        return !c || strcaseeq(c, ".UTF-8") || strcasestr(locale, ".UTF-8@");
+}
+
+static int locale_gen_locale_supported(const char *locale_entry) {
+        /* Returns an error valus <= 0 if the locale-gen entry is invalid or unsupported,
+         * 1 in case the locale entry is valid, and -EOPNOTSUPP specifically in case
+         * the distributor has not provided us with a SUPPORTED file to check
+         * locale for validity. */
+
+        _cleanup_fclose_ FILE *f = NULL;
+        int r;
+
+        assert(locale_entry);
+
+        /* Locale templates without country code are never supported */
+        if (!strstr(locale_entry, "_"))
+                return -EINVAL;
+
+        f = fopen("/usr/share/i18n/SUPPORTED", "re");
+        if (!f) {
+                if (errno == ENOENT)
+                        return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+                                               "Unable to check validity of locale entry %s: /usr/share/i18n/SUPPORTED does not exist",
+                                               locale_entry);
+                return -errno;
+        }
+
+        for (;;) {
+                _cleanup_free_ char *line = NULL;
+
+                r = read_stripped_line(f, LONG_LINE_MAX, &line);
+                if (r < 0)
+                        return log_debug_errno(r, "Failed to read /usr/share/i18n/SUPPORTED: %m");
+                if (r == 0)
+                        return 0;
+
+                if (strcaseeq_ptr(line, locale_entry))
+                        return 1;
+        }
+}
+#endif
+
+int locale_gen_enable_locale(const char *locale) {
+#if HAVE_LOCALEGEN
+        _cleanup_fclose_ FILE *fr = NULL, *fw = NULL;
+        _cleanup_(unlink_and_freep) char *temp_path = NULL;
+        _cleanup_free_ char *locale_entry = NULL;
+        bool locale_enabled = false, first_line = false;
+        bool write_new = false;
+        int r;
+
+        if (isempty(locale))
+                return 0;
+
+        if (locale_encoding_is_utf8_or_unspecified(locale)) {
+                locale_entry = strjoin(locale, " UTF-8");
+                if (!locale_entry)
+                        return -ENOMEM;
+        } else
+                return -ENOEXEC; /* We do not process non-UTF-8 locale */
+
+        r = locale_gen_locale_supported(locale_entry);
+        if (r == 0)
+                return -EINVAL;
+        if (r < 0 && r != -EOPNOTSUPP)
+                return r;
+
+        fr = fopen("/etc/locale.gen", "re");
+        if (!fr) {
+                if (errno != ENOENT)
+                        return -errno;
+                write_new = true;
+        }
+
+        r = fopen_temporary("/etc/locale.gen", &fw, &temp_path);
+        if (r < 0)
+                return r;
+
+        if (write_new)
+                (void) fchmod(fileno(fw), 0644);
+        else {
+                /* apply mode & xattrs of the original file to new file */
+                r = copy_access(fileno(fr), fileno(fw));
+                if (r < 0)
+                        return r;
+                r = copy_xattr(fileno(fr), NULL, fileno(fw), NULL, COPY_ALL_XATTRS);
+                if (r < 0)
+                        log_debug_errno(r, "Failed to copy all xattrs from old to new /etc/locale.gen file, ignoring: %m");
+        }
+
+        if (!write_new) {
+                /* The config file ends with a line break, which we do not want to include before potentially appending a new locale
+                * instead of uncommenting an existing line. By prepending linebreaks, we can avoid buffering this file but can still write
+                * a nice config file without empty lines */
+                first_line = true;
+                for (;;) {
+                        _cleanup_free_ char *line = NULL;
+                        char *line_locale;
+
+                        r = read_line(fr, LONG_LINE_MAX, &line);
+                        if (r < 0)
+                                return r;
+                        if (r == 0)
+                                break;
+
+                        if (locale_enabled) {
+                                /* Just complete writing the file if the new locale was already enabled */
+                                if (!first_line)
+                                        fputc('\n', fw);
+                                fputs(line, fw);
+                                first_line = false;
+                                continue;
+                        }
+
+                        line_locale = strstrip(line);
+                        if (isempty(line_locale)) {
+                                fputc('\n', fw);
+                                first_line = false;
+                                continue;
+                        }
+
+                        if (line_locale[0] == '#')
+                                line_locale = strstrip(line_locale + 1);
+                        else if (strcaseeq_ptr(line_locale, locale_entry))
+                                return 0; /* the file already had our locale activated, so skip updating it */
+
+                        if (strcaseeq_ptr(line_locale, locale_entry)) {
+                                /* Uncomment existing line for new locale */
+                                if (!first_line)
+                                        fputc('\n', fw);
+                                fputs(locale_entry, fw);
+                                locale_enabled = true;
+                                first_line = false;
+                                continue;
+                        }
+
+                        /* The line was not for the locale we want to enable, just copy it */
+                        if (!first_line)
+                                fputc('\n', fw);
+                        fputs(line, fw);
+                        first_line = false;
+                }
+        }
+
+        /* Add locale to enable to the end of the file if it was not found as commented line */
+        if (!locale_enabled) {
+                if (!write_new)
+                        fputc('\n', fw);
+                fputs(locale_entry, fw);
+        }
+        fputc('\n', fw);
+
+        r = fflush_sync_and_check(fw);
+        if (r < 0)
+                return r;
+
+        if (rename(temp_path, "/etc/locale.gen") < 0)
+                return -errno;
+        temp_path = mfree(temp_path);
+
+        return 0;
+#else
+        return -EOPNOTSUPP;
+#endif
+}
+
+int locale_gen_run(void) {
+#if HAVE_LOCALEGEN
+        pid_t pid;
+        int r;
+
+        r = safe_fork("(sd-localegen)", FORK_RESET_SIGNALS|FORK_RLIMIT_NOFILE_SAFE|FORK_CLOSE_ALL_FDS|FORK_LOG|FORK_WAIT, &pid);
+        if (r < 0)
+                return r;
+        if (r == 0) {
+                execl(LOCALEGEN_PATH, LOCALEGEN_PATH, NULL);
+                _exit(EXIT_FAILURE);
+        }
+
+        return 0;
+#else
+        return -EOPNOTSUPP;
+#endif
+}