bootspec: rename "filename" field to "id"

This follows the renaming done a few commits earlier too systemd-boot
itself.

Also, let's show the ID, since it's useful.

src/boot/bootctl.c

@@ -1029,6 +1029,8 @@ static int verb_list(int argc, char *argv[], void *userdata) {
                        ansi_highlight_green(),
                        n == (unsigned) config.default_entry ? " (default)" : "",
                        ansi_normal());
+                if (e->id)
+                        printf("           id: %s\n", e->id);
                 if (e->version)
                         printf("      version: %s\n", e->version);
                 if (e->machine_id)

src/shared/bootspec.c

@@ -23,7 +23,7 @@
 void boot_entry_free(BootEntry *entry) {
         assert(entry);
 
-        free(entry->filename);
+        free(entry->id);
         free(entry->title);
         free(entry->show_title);
         free(entry->version);
@@ -53,8 +53,8 @@ int boot_entry_load(const char *path, BootEntry *entry) {
         }
 
         b = basename(path);
-        tmp.filename = strndup(b, c - b);
-        if (!tmp.filename)
+        tmp.id = strndup(b, c - b);
+        if (!tmp.id)
                 return log_oom();
 
         f = fopen(path, "re");
@@ -203,7 +203,7 @@ int boot_loader_read_conf(const char *path, BootConfig *config) {
 }
 
 static int boot_entry_compare(const BootEntry *a, const BootEntry *b) {
-        return str_verscmp(a->filename, b->filename);
+        return str_verscmp(a->id, b->id);
 }
 
 int boot_entries_find(const char *dir, BootEntry **ret_entries, size_t *ret_n_entries) {
@@ -300,7 +300,7 @@ static int boot_entries_uniquify(BootEntry *entries, size_t n_entries) {
         /* Add file name to non-unique titles */
         for (i = 0; i < n_entries; i++)
                 if (arr[i]) {
-                        r = asprintf(&s, "%s (%s)", boot_entry_title(entries + i), entries[i].filename);
+                        r = asprintf(&s, "%s (%s)", boot_entry_title(entries + i), entries[i].id);
                         if (r < 0)
                                 return -ENOMEM;
 
@@ -317,30 +317,30 @@ static int boot_entries_select_default(const BootConfig *config) {
 
         if (config->entry_oneshot)
                 for (i = config->n_entries - 1; i >= 0; i--)
-                        if (streq(config->entry_oneshot, config->entries[i].filename)) {
-                                log_debug("Found default: filename \"%s\" is matched by LoaderEntryOneShot",
-                                          config->entries[i].filename);
+                        if (streq(config->entry_oneshot, config->entries[i].id)) {
+                                log_debug("Found default: id \"%s\" is matched by LoaderEntryOneShot",
+                                          config->entries[i].id);
                                 return i;
                         }
 
         if (config->entry_default)
                 for (i = config->n_entries - 1; i >= 0; i--)
-                        if (streq(config->entry_default, config->entries[i].filename)) {
-                                log_debug("Found default: filename \"%s\" is matched by LoaderEntryDefault",
-                                          config->entries[i].filename);
+                        if (streq(config->entry_default, config->entries[i].id)) {
+                                log_debug("Found default: id \"%s\" is matched by LoaderEntryDefault",
+                                          config->entries[i].id);
                                 return i;
                         }
 
         if (config->default_pattern)
                 for (i = config->n_entries - 1; i >= 0; i--)
-                        if (fnmatch(config->default_pattern, config->entries[i].filename, FNM_CASEFOLD) == 0) {
-                                log_debug("Found default: filename \"%s\" is matched by pattern \"%s\"",
-                                          config->entries[i].filename, config->default_pattern);
+                        if (fnmatch(config->default_pattern, config->entries[i].id, FNM_CASEFOLD) == 0) {
+                                log_debug("Found default: id \"%s\" is matched by pattern \"%s\"",
+                                          config->entries[i].id, config->default_pattern);
                                 return i;
                         }
 
         if (config->n_entries > 0)
-                log_debug("Found default: last entry \"%s\"", config->entries[config->n_entries - 1].filename);
+                log_debug("Found default: last entry \"%s\"", config->entries[config->n_entries - 1].id);
         else
                 log_debug("Found no default boot entry :(");
 

src/shared/bootspec.h

@@ -9,8 +9,7 @@
 #include "sd-id128.h"
 
 typedef struct BootEntry {
-        char *filename;
-
+        char *id;
         char *title;
         char *show_title;
         char *version;
@@ -48,7 +47,7 @@ void boot_config_free(BootConfig *config);
 int boot_entries_load_config(const char *esp_path, BootConfig *config);
 
 static inline const char* boot_entry_title(const BootEntry *entry) {
-        return entry->show_title ?: entry->title ?: entry->filename;
+        return entry->show_title ?: entry->title ?: entry->id;
 }
 
 int find_esp_and_warn(const char *path, bool unprivileged_mode, char **ret_path, uint32_t *ret_part, uint64_t *ret_pstart, uint64_t *ret_psize, sd_id128_t *ret_uuid);