Move generic specifier functions to shared

No functional change. This makes it possible to use them in install.c.

src/core/unit-printf.c

@@ -211,42 +211,6 @@ static char *specifier_user_shell(char specifier, void *data, void *userdata) {
         return strdup(shell);
 }
 
-static char *specifier_machine_id(char specifier, void *data, void *userdata) {
-        sd_id128_t id;
-        char *buf;
-        int r;
-
-        r = sd_id128_get_machine(&id);
-        if (r < 0)
-                return NULL;
-
-        buf = new(char, 33);
-        if (!buf)
-                return NULL;
-
-        return sd_id128_to_string(id, buf);
-}
-
-static char *specifier_boot_id(char specifier, void *data, void *userdata) {
-        sd_id128_t id;
-        char *buf;
-        int r;
-
-        r = sd_id128_get_boot(&id);
-        if (r < 0)
-                return NULL;
-
-        buf = new(char, 33);
-        if (!buf)
-                return NULL;
-
-        return sd_id128_to_string(id, buf);
-}
-
-static char *specifier_host_name(char specifier, void *data, void *userdata) {
-        return gethostname_malloc();
-}
-
 char *unit_name_printf(Unit *u, const char* format) {
 
         /*

src/shared/specifier.c

@@ -109,3 +109,39 @@ char *specifier_printf(const char *text, const Specifier table[], void *userdata
 char* specifier_string(char specifier, void *data, void *userdata) {
         return strdup(strempty(data));
 }
+
+char *specifier_machine_id(char specifier, void *data, void *userdata) {
+        sd_id128_t id;
+        char *buf;
+        int r;
+
+        r = sd_id128_get_machine(&id);
+        if (r < 0)
+                return NULL;
+
+        buf = new(char, 33);
+        if (!buf)
+                return NULL;
+
+        return sd_id128_to_string(id, buf);
+}
+
+char *specifier_boot_id(char specifier, void *data, void *userdata) {
+        sd_id128_t id;
+        char *buf;
+        int r;
+
+        r = sd_id128_get_boot(&id);
+        if (r < 0)
+                return NULL;
+
+        buf = new(char, 33);
+        if (!buf)
+                return NULL;
+
+        return sd_id128_to_string(id, buf);
+}
+
+char *specifier_host_name(char specifier, void *data, void *userdata) {
+        return gethostname_malloc();
+}

src/shared/specifier.h

@@ -31,4 +31,8 @@ typedef struct Specifier {
 
 char *specifier_printf(const char *text, const Specifier table[], void *userdata);
 
-char* specifier_string(char specifier, void *data, void *userdata);
+char *specifier_string(char specifier, void *data, void *userdata);
+
+char *specifier_machine_id(char specifier, void *data, void *userdata);
+char *specifier_boot_id(char specifier, void *data, void *userdata);
+char *specifier_host_name(char specifier, void *data, void *userdata);