locale-util: two fixlets for supporting musl (#39689)

src/basic/locale-util.c

@@ -5,6 +5,7 @@
 #include <stdlib.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
+#include <unistd.h>
 
 #include "dirent-util.h"
 #include "env-util.h"
@@ -54,6 +55,7 @@ static char* normalize_locale(const char *name) {
         return strdup(name);
 }
 
+#ifdef __GLIBC__
 static int add_locales_from_archive(Set *locales) {
         /* Stolen from glibc... */
 
@@ -182,6 +184,34 @@ static int add_locales_from_libdir(Set *locales) {
         return 0;
 }
 
+#else
+
+static int add_locales_for_musl(Set *locales) {
+        int r;
+
+        assert(locales);
+
+        _cleanup_closedir_ DIR *dir = opendir("/usr/share/i18n/locales/musl/");
+        if (!dir)
+                return errno == ENOENT ? 0 : -errno;
+
+        FOREACH_DIRENT(de, dir, return -errno) {
+                if (de->d_type != DT_REG)
+                        continue;
+
+                char *z = normalize_locale(de->d_name);
+                if (!z)
+                        return -ENOMEM;
+
+                r = set_consume(locales, z);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+#endif
+
 int get_locales(char ***ret) {
         _cleanup_set_free_ Set *locales = NULL;
         int r;
@@ -190,6 +220,7 @@ int get_locales(char ***ret) {
         if (!locales)
                 return -ENOMEM;
 
+#ifdef __GLIBC__
         r = add_locales_from_archive(locales);
         if (r < 0 && r != -ENOENT)
                 return r;
@@ -197,6 +228,11 @@ int get_locales(char ***ret) {
         r = add_locales_from_libdir(locales);
         if (r < 0)
                 return r;
+#else
+        r = add_locales_for_musl(locales);
+        if (r < 0)
+                return r;
+#endif
 
         char *locale;
         SET_FOREACH(locale, locales) {
@@ -264,11 +300,25 @@ int locale_is_installed(const char *name) {
         if (STR_IN_SET(name, "C", "POSIX")) /* These ones are always OK */
                 return true;
 
+#ifdef __GLIBC__
         _cleanup_(freelocalep) locale_t loc = newlocale(LC_ALL_MASK, name, (locale_t) 0);
         if (loc == (locale_t) 0)
                 return errno == ENOMEM ? -ENOMEM : false;
 
         return true;
+#else
+        /* musl also has C.UTF-8 as builtin */
+        if (streq(name, "C.UTF-8"))
+                return true;
+
+        /* musl's newlocale() always succeeds and provides a fake locale object even when the locale does
+         * not exist. Hence, we need to explicitly check if the locale file exists. */
+        _cleanup_free_ char *p = path_join("/usr/share/i18n/locales/musl/", name);
+        if (!p)
+                return -ENOMEM;
+
+        return access(p, F_OK) >= 0;
+#endif
 }
 
 static bool is_locale_utf8_impl(void) {