boot: Improve EFISTUB name and version detection.

Make two minor cosmetic changes to how config_entry_add_linux() extracts
OS information from the embedded /etc/os-release in EFISTUB binaries.
This increases the detail of information available to the user for
EFISTUB entries.

* entry->version, which was previously always null, is now set to the
value of VERSION, or VERSION_ID, or BUILD_ID (preferred in that order).
* entry->title, which was previously set to the value of PRETTY_NAME, can
now fall back to NAME or ID if PRETTY_NAME is not present. In that case,
NAME is preferred over ID.

1 files changed, 28 insertions, 8 deletions

diff --git a/src/boot/efi/boot.c b/src/boot/efi/boot.c
index f6989ddb9b..e86824ad31 100644
--- a/src/boot/efi/boot.c
+++ b/src/boot/efi/boot.c
@@ -1770,7 +1770,8 @@ static ConfigEntry *config_entry_add_loader(
                 CHAR16 *id,
                 CHAR16 key,
                 CHAR16 *title,
-                CHAR16 *loader) {
+                CHAR16 *loader,
+                CHAR16 *version) {
 
         ConfigEntry *entry;
 
@@ -1778,6 +1779,7 @@ static ConfigEntry *config_entry_add_loader(
         *entry = (ConfigEntry) {
                 .type = type,
                 .title = StrDuplicate(title),
+                .version = StrDuplicate(version),
                 .device = device,
                 .loader = StrDuplicate(loader),
                 .id = StrDuplicate(id),
@@ -1835,7 +1837,7 @@ static BOOLEAN config_entry_add_loader_auto(
                 return FALSE;
         uefi_call_wrapper(handle->Close, 1, handle);
 
-        entry = config_entry_add_loader(config, device, LOADER_UNDEFINED, id, key, title, loader);
+        entry = config_entry_add_loader(config, device, LOADER_UNDEFINED, id, key, title, loader, NULL);
         if (!entry)
                 return FALSE;
 
@@ -1903,10 +1905,12 @@ static VOID config_entry_add_linux(
                 CHAR8 *line;
                 UINTN pos = 0;
                 CHAR8 *key, *value;
+                CHAR16 *os_name_pretty = NULL;
                 CHAR16 *os_name = NULL;
                 CHAR16 *os_id = NULL;
                 CHAR16 *os_version = NULL;
-                CHAR16 *os_build = NULL;
+                CHAR16 *os_version_id = NULL;
+                CHAR16 *os_build_id = NULL;
 
                 err = uefi_call_wrapper(linux_dir->Read, 3, linux_dir, &bufsize, buf);
                 if (bufsize == 0 || EFI_ERROR(err))
@@ -1937,6 +1941,12 @@ static VOID config_entry_add_linux(
                 /* read properties from the embedded os-release file */
                 while ((line = line_get_key_value(content, (CHAR8 *)"=", &pos, &key, &value))) {
                         if (strcmpa((CHAR8 *)"PRETTY_NAME", key) == 0) {
+                                FreePool(os_name_pretty);
+                                os_name_pretty = stra_to_str(value);
+                                continue;
+                        }
+
+                        if (strcmpa((CHAR8 *)"NAME", key) == 0) {
                                 FreePool(os_name);
                                 os_name = stra_to_str(value);
                                 continue;
@@ -1954,19 +1964,27 @@ static VOID config_entry_add_linux(
                                 continue;
                         }
 
+                        if (strcmpa((CHAR8 *)"VERSION_ID", key) == 0) {
+                                FreePool(os_version_id);
+                                os_version_id = stra_to_str(value);
+                                continue;
+                        }
+
                         if (strcmpa((CHAR8 *)"BUILD_ID", key) == 0) {
-                                FreePool(os_build);
-                                os_build = stra_to_str(value);
+                                FreePool(os_build_id);
+                                os_build_id = stra_to_str(value);
                                 continue;
                         }
                 }
 
-                if (os_name && os_id && (os_version || os_build)) {
+                if ((os_name_pretty || os_name) && os_id && (os_version || os_version_id || os_build_id)) {
                         _cleanup_freepool_ CHAR16 *path = NULL;
 
                         path = PoolPrint(L"\\EFI\\Linux\\%s", f->FileName);
 
-                        entry = config_entry_add_loader(config, device, LOADER_LINUX, f->FileName, 'l', os_name, path);
+                        entry = config_entry_add_loader(config, device, LOADER_LINUX, f->FileName, 'l',
+                                                        os_name_pretty ? : (os_name ? : os_id), path,
+                                                        os_version ? : (os_version_id ? : os_build_id));
 
                         FreePool(content);
                         content = NULL;
@@ -1985,10 +2003,12 @@ static VOID config_entry_add_linux(
                         config_entry_parse_tries(entry, L"\\EFI\\Linux", f->FileName, L".efi");
                 }
 
+                FreePool(os_name_pretty);
                 FreePool(os_name);
                 FreePool(os_id);
                 FreePool(os_version);
-                FreePool(os_build);
+                FreePool(os_version_id);
+                FreePool(os_build_id);
                 FreePool(content);
         }