[PATCH v1] Add bootchooser command option for active boot target

[Markus Burri <markus.burri@mt.com>]

Add bootchooser command option to extract and save the active target.
The information about active target are stored into two variables
(bootchooser.active_target and bootchooser.active_boot)
This information may be used into scripts to do actions related to the active
target before starting it.

Signed-off-by: Markus Burri <markus.burri@mt.com>

Gbp-Pq: Name 0058-Add-command-for-next-boot-target.patch
---
 Documentation/user/bootchooser.rst |  6 ++++++
 commands/bootchooser.c             | 12 +++++++++++-
 common/bootchooser.c               | 21 +++++++++++++++++++++
 include/bootchooser.h              |  1 +
 4 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/Documentation/user/bootchooser.rst b/Documentation/user/bootchooser.rst
index 8456e11..68ec1b6 100644
--- a/Documentation/user/bootchooser.rst
+++ b/Documentation/user/bootchooser.rst
@@ -168,6 +168,12 @@ options not specific to any boot target.
   set of ``global.bootchooser.<targetname>.<variablename>`` variables must exist.
 ``global.bootchooser.last_chosen``
   *bootchooser* sets this to the boot target that was chosen on last boot (index).
+``global.bootchooser.active_target``
+  Set to the active boot target that will boot next.
+  Call *bootchooser -n* to update the value.
+``global.bootchooser.active_boot``
+  Set to the boot device of the active target that will boot next. 
+  Call *bootchooser -n* to update the value.
 
 .. _bootchooser,setup_example:
 
diff --git a/commands/bootchooser.c b/commands/bootchooser.c
index ac763a6..20bd2d6 100644
--- a/commands/bootchooser.c
+++ b/commands/bootchooser.c
@@ -59,8 +59,9 @@ static int do_bootchooser(int argc, char *argv[])
 	int info = 0;
 	bool done_something = false;
 	bool last_boot_successful = false;
+	bool active_boot_target = false;
 
-	while ((opt = getopt(argc, argv, "a:p:is")) > 0) {
+	while ((opt = getopt(argc, argv, "a:p:ins")) > 0) {
 		switch (opt) {
 		case 'a':
 			if (!strcmp(optarg, "default"))
@@ -77,6 +78,9 @@ static int do_bootchooser(int argc, char *argv[])
 		case 'i':
 			info = 1;
 			break;
+		case 'n':
+			active_boot_target = true;
+			break;
 		case 's':
 			last_boot_successful = true;
 			break;
@@ -120,6 +124,11 @@ static int do_bootchooser(int argc, char *argv[])
 		done_something = true;
 	}
 
+	if (active_boot_target) {
+		bootchooser_active_target(bootchooser);
+		done_something = true;
+	}
+
 	if (!done_something) {
 		printf("Nothing to do\n");
 		ret = COMMAND_ERROR_USAGE;
@@ -137,6 +146,7 @@ BAREBOX_CMD_HELP_TEXT("Options:")
 BAREBOX_CMD_HELP_OPT ("-a <n|default> [TARGETS]",  "set remaining attempts of given targets to 'n' or the default attempts")
 BAREBOX_CMD_HELP_OPT ("-p <n|default> [TARGETS]",  "set priority of given targets to 'n' or the default priority")
 BAREBOX_CMD_HELP_OPT ("-i",  "Show information about the bootchooser")
+BAREBOX_CMD_HELP_OPT ("-n",  "Save active boot target to bootchooser.active_target and active boot device to bootchooser.active_boot")
 BAREBOX_CMD_HELP_OPT ("-s",  "Mark the last boot successful")
 BAREBOX_CMD_HELP_END
 
diff --git a/common/bootchooser.c b/common/bootchooser.c
index c08db03..1ec29e6 100644
--- a/common/bootchooser.c
+++ b/common/bootchooser.c
@@ -619,6 +619,27 @@ void bootchooser_info(struct bootchooser *bc)
 	       bc->last_chosen->name : "unknown");
 }
 
+/**
+ * bootchooser_active_target - Save information about active boot target
+ * @bc: The bootchooser
+ */
+void bootchooser_active_target(struct bootchooser *bc)
+{
+	struct bootchooser_target *target;
+
+	list_for_each_entry(target, &bc->targets, list) {
+		if (bootchooser_target_ok(target, NULL)) {
+			if (bc->verbose) {
+				pr_info("bootchooser.active_target=%s\n", target->name);
+				pr_info("bootchooser.active_boot=%s\n", target->boot);
+			}
+			nvvar_add("bootchooser.active_target", target->name);
+			nvvar_add("bootchooser.active_boot", target->boot);
+			return;
+		}
+	}
+}
+
 /**
  * bootchooser_get_target - get the target that shall be booted next
  * @bc:		The bootchooser
diff --git a/include/bootchooser.h b/include/bootchooser.h
index 7822c01..9825593 100644
--- a/include/bootchooser.h
+++ b/include/bootchooser.h
@@ -12,6 +12,7 @@ int bootchooser_save(struct bootchooser *bootchooser);
 int bootchooser_put(struct bootchooser *bootchooser);
 
 void bootchooser_info(struct bootchooser *bootchooser);
+void bootchooser_active_target(struct bootchooser *bc);
 
 int bootchooser_boot(struct bootchooser *bc);
 
-- 
2.39.2