PID1: detect battery level in initrd and if low refuse continuing to boot, print message and shut down.

src/basic/glyph-util.c

@@ -23,7 +23,7 @@ bool emoji_enabled(void) {
         return cached_emoji_enabled;
 }
 
-const char *special_glyph(SpecialGlyph code) {
+const char *special_glyph_full(SpecialGlyph code, bool force_utf) {
 
         /* A list of a number of interesting unicode glyphs we can use to decorate our output. It's probably wise to be
          * conservative here, and primarily stick to the glyphs defined in the eurlatgr font, so that display still
@@ -71,6 +71,7 @@ const char *special_glyph(SpecialGlyph code) {
                         [SPECIAL_GLYPH_RECYCLING]               = "~",
                         [SPECIAL_GLYPH_DOWNLOAD]                = "\\",
                         [SPECIAL_GLYPH_SPARKLES]                = "*",
+                        [SPECIAL_GLYPH_LOW_BATTERY]             = "!",
                         [SPECIAL_GLYPH_WARNING_SIGN]            = "!",
                 },
 
@@ -129,6 +130,7 @@ const char *special_glyph(SpecialGlyph code) {
                         [SPECIAL_GLYPH_RECYCLING]               = u8"♻️",        /* actually called: UNIVERSAL RECYCLNG SYMBOL */
                         [SPECIAL_GLYPH_DOWNLOAD]                = u8"⤵️",        /* actually called: RIGHT ARROW CURVING DOWN */
                         [SPECIAL_GLYPH_SPARKLES]                = u8"✨",
+                        [SPECIAL_GLYPH_LOW_BATTERY]             = u8"🪫",
                         [SPECIAL_GLYPH_WARNING_SIGN]            = u8"⚠️",
                 },
         };
@@ -137,5 +139,5 @@ const char *special_glyph(SpecialGlyph code) {
                 return NULL;
 
         assert(code < _SPECIAL_GLYPH_MAX);
-        return draw_table[code >= _SPECIAL_GLYPH_FIRST_EMOJI ? emoji_enabled() : is_locale_utf8()][code];
+        return draw_table[force_utf || (code >= _SPECIAL_GLYPH_FIRST_EMOJI ? emoji_enabled() : is_locale_utf8())][code];
 }

src/basic/glyph-util.h

@@ -44,15 +44,24 @@ typedef enum SpecialGlyph {
         SPECIAL_GLYPH_RECYCLING,
         SPECIAL_GLYPH_DOWNLOAD,
         SPECIAL_GLYPH_SPARKLES,
+        SPECIAL_GLYPH_LOW_BATTERY,
         SPECIAL_GLYPH_WARNING_SIGN,
         _SPECIAL_GLYPH_MAX,
         _SPECIAL_GLYPH_INVALID = -EINVAL,
 } SpecialGlyph;
 
-const char *special_glyph(SpecialGlyph code) _const_;
+const char *special_glyph_full(SpecialGlyph code, bool force_utf) _const_;
 
 bool emoji_enabled(void);
 
+static inline const char *special_glyph(SpecialGlyph code) {
+        return special_glyph_full(code, false);
+}
+
+static inline const char *special_glyph_force_utf(SpecialGlyph code) {
+        return special_glyph_full(code, true);
+}
+
 static inline const char *special_glyph_check_mark(bool b) {
         return b ? special_glyph(SPECIAL_GLYPH_CHECK_MARK) : special_glyph(SPECIAL_GLYPH_CROSS_MARK);
 }