exosphere: add new ConfigItem which allows the caller to retrieve the git commit hash. (#493)

exosphere/Makefile

@@ -10,6 +10,7 @@ TOPDIR ?= $(CURDIR)
 include $(DEVKITPRO)/devkitA64/base_rules
 
 AMSBRANCH := $(shell git symbolic-ref --short HEAD)
+AMSHASH = $(shell git rev-parse --short=16 HEAD)
 AMSREV := $(AMSBRANCH)-$(shell git rev-parse --short HEAD)
 
 ifneq (, $(strip $(shell git status --porcelain 2>/dev/null)))
@@ -33,7 +34,7 @@ INCLUDES	:=	include ../common/include
 # options for code generation
 #---------------------------------------------------------------------------------
 ARCH	:=	-march=armv8-a -mtune=cortex-a57 -mgeneral-regs-only #<- important
-DEFINES	:=	-D__CCPLEX__ -DATMOSPHERE_GIT_BRANCH=\"$(AMSBRANCH)\" -DATMOSPHERE_GIT_REV=\"$(AMSREV)\"
+DEFINES	:=	-D__CCPLEX__ -DATMOSPHERE_GIT_BRANCH=\"$(AMSBRANCH)\" -DATMOSPHERE_GIT_REV=\"$(AMSREV)\" -DATMOSPHERE_RELEASE_VERSION_HASH="0x$(AMSHASH)"
 CFLAGS	:= \
 	-g \
 	-O2 \

exosphere/src/configitem.c

@@ -260,6 +260,10 @@ uint32_t configitem_get(bool privileged, ConfigItem item, uint64_t *p_outvalue)
             /* UNOFFICIAL: The fact that we are executing means we aren't in the process of shutting down. */
             *p_outvalue = 0;
             break;
+        case CONFIGITEM_EXOSPHERE_VERHASH:
+            /* UNOFFICIAL: Gets information about the current exosphere git commit hash. */
+            *p_outvalue = ATMOSPHERE_RELEASE_VERSION_HASH;
+            break;
         default:
             result = 2;
             break;

exosphere/src/configitem.h

@@ -43,6 +43,7 @@ typedef enum {
     CONFIGITEM_EXOSPHERE_VERSION = 65000,
     CONFIGITEM_NEEDS_REBOOT = 65001,
     CONFIGITEM_NEEDS_SHUTDOWN = 65002,
+    CONFIGITEM_EXOSPHERE_VERHASH = 65003,
 } ConfigItem;
 
 #define REBOOT_KIND_NO_REBOOT     0