cmd: gpt: Add command to set bootable flags

Adds a command that can be used to modify the GPT partition table to
indicate which partitions should have the bootable flag set

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>

cmd/gpt.c

@@ -970,6 +970,81 @@ static int do_rename_gpt_parts(struct blk_desc *dev_desc, char *subcomm,
 	free(partitions_list);
 	return ret;
 }
+
+/**
+ * gpt_set_bootable() - Set bootable flags for partitions
+ *
+ * Sets the bootable flag for any partition names in the comma separated list of
+ * partition names. Any partitions not in the list have their bootable flag
+ * cleared
+ *
+ * @desc: block device descriptor
+ * @name: Comma separated list of partition names
+ *
+ * @Return: '0' on success and -ve error on failure
+ */
+static int gpt_set_bootable(struct blk_desc *blk_dev_desc, char *const part_list)
+{
+	char *name;
+	char disk_guid[UUID_STR_LEN + 1];
+	struct list_head *pos;
+	struct disk_part *curr;
+	struct disk_partition *partitions = NULL;
+	int part_count = 0;
+	int ret = get_disk_guid(blk_dev_desc, disk_guid);
+
+	if (ret < 0)
+		return ret;
+
+	ret = get_gpt_info(blk_dev_desc);
+	if (ret <= 0)
+		goto out;
+
+	part_count = ret;
+	partitions = malloc(sizeof(*partitions) * part_count);
+	if (!partitions) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	/* Copy partitions and clear bootable flag */
+	part_count = 0;
+	list_for_each(pos, &disk_partitions) {
+		curr = list_entry(pos, struct disk_part, list);
+		partitions[part_count] = curr->gpt_part_info;
+		partitions[part_count].bootable &= ~PART_BOOTABLE;
+		part_count++;
+	}
+
+	name = strtok(part_list, ",");
+	while (name) {
+		bool found = false;
+
+		for (int i = 0; i < part_count; i++) {
+			if (strcmp((char *)partitions[i].name, name) == 0) {
+				partitions[i].bootable |= PART_BOOTABLE;
+				found = true;
+			}
+		}
+
+		if (!found) {
+			printf("Warning: No partition matching '%s' found\n",
+			       name);
+		}
+
+		name = strtok(NULL, ",");
+	}
+
+	ret = gpt_restore(blk_dev_desc, disk_guid, partitions, part_count);
+
+out:
+	del_gpt_info();
+
+	if (partitions)
+		free(partitions);
+
+	return ret;
+}
 #endif
 
 /**
@@ -1029,6 +1104,8 @@ static int do_gpt(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 	} else if ((strcmp(argv[1], "swap") == 0) ||
 		   (strcmp(argv[1], "rename") == 0)) {
 		ret = do_rename_gpt_parts(blk_dev_desc, argv[1], argv[4], argv[5]);
+	} else if ((strcmp(argv[1], "set-bootable") == 0)) {
+		ret = gpt_set_bootable(blk_dev_desc, argv[4]);
 #endif
 	} else {
 		return CMD_RET_USAGE;
@@ -1080,8 +1157,11 @@ U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
 	"      and vice-versa\n"
 	" gpt rename <interface> <dev> <part> <name>\n"
 	"    - rename the specified partition\n"
+	" gpt set-bootable <interface> <dev> <list>\n"
+	"    - make partition names in list bootable\n"
 	" Example usage:\n"
 	" gpt swap mmc 0 foo bar\n"
 	" gpt rename mmc 0 3 foo\n"
+	" gpt set-bootable mmc 0 boot_a,boot_b\n"
 #endif
 );

doc/usage/cmd/gpt.rst

@@ -13,6 +13,7 @@ Synopsis
     gpt read <interface> <dev> [<varname>]
     gpt rename <interface> <dev> <part> <name>
     gpt repair <interface> <dev>
+    gpt set-bootable <interface> <dev> <partition list>
     gpt setenv <interface> <dev> <partition name>
     gpt swap <interface> <dev> <name1> <name2>
     gpt verify <interface> <dev> [<partition string>]
@@ -90,6 +91,13 @@ gpt repair
 
 Repairs the GPT partition tables if it they become corrupted.
 
+gpt set-bootable
+~~~~~~~~~~~~~~~~
+
+Sets the bootable flag for all partitions in the table. If the partition name
+is in 'partition list' (separated by ','), the bootable flag is set, otherwise
+it is cleared. CONFIG_CMD_GPT_RENAME=y is required.
+
 gpt setenv
 ~~~~~~~~~~
 
@@ -187,3 +195,7 @@ Get the GUID for a disk::
     => gpt guid mmc gpt_disk_uuid
     => echo ${gpt_disk_uuid}
     bec9fc2a-86c1-483d-8a0e-0109732277d7
+
+Set the bootable flag for the 'boot' partition and clear it for all others::
+
+    => gpt set-bootable mmc 0 boot

test/py/tests/test_gpt.py

@@ -222,6 +222,28 @@ def test_gpt_swap_partitions(state_disk_image, u_boot_console):
     assert '0x00000800	0x00000fff	"part2"' in output
     assert '0x00001000	0x00001bff	"part1"' in output
 
+@pytest.mark.buildconfigspec('cmd_gpt')
+@pytest.mark.buildconfigspec('cmd_gpt_rename')
+@pytest.mark.buildconfigspec('cmd_part')
+@pytest.mark.requiredtool('sgdisk')
+def test_gpt_set_bootable(state_disk_image, u_boot_console):
+    """Test the gpt set-bootable command."""
+
+    u_boot_console.run_command('host bind 0 ' + state_disk_image.path)
+    parts = ('part2', 'part1')
+    for bootable in parts:
+        output = u_boot_console.run_command(f'gpt set-bootable host 0 {bootable}')
+        assert 'success!' in output
+
+        for p in parts:
+            output = u_boot_console.run_command(f'gpt setenv host 0 {p}')
+            assert 'success!' in output
+            output = u_boot_console.run_command('echo ${gpt_partition_bootable}')
+            if p == bootable:
+                assert output.rstrip() == '1'
+            else:
+                assert output.rstrip() == '0'
+
 @pytest.mark.boardspec('sandbox')
 @pytest.mark.buildconfigspec('cmd_gpt')
 @pytest.mark.buildconfigspec('cmd_part')