add version applet

.gitignore

@@ -13,6 +13,9 @@ build
 .vscode*
 .DS_Store
 
+# version
+/src/version.h
+
 # for package files
 lpac-*.deb
 lpac-*.zip

cmake/git-version.cmake

@@ -0,0 +1,25 @@
+# from https://github.com/nocnokneo/cmake-git-versioning-example
+
+if(GIT_EXECUTABLE)
+  get_filename_component(SRC_DIR ${SRC} DIRECTORY)
+  # Generate a git-describe version string from Git repository tags
+  execute_process(
+    COMMAND ${GIT_EXECUTABLE} describe --tags --dirty --match "v*"
+    WORKING_DIRECTORY ${SRC_DIR}
+    OUTPUT_VARIABLE GIT_DESCRIBE_VERSION
+    RESULT_VARIABLE GIT_DESCRIBE_ERROR_CODE
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+  )
+  if(NOT GIT_DESCRIBE_ERROR_CODE)
+    set(LPAC_VERSION ${GIT_DESCRIBE_VERSION})
+  endif()
+endif()
+
+# Final fallback: Just use a bogus version string that is semantically older
+# than anything else and spit out a warning to the developer.
+if(NOT DEFINED LPAC_VERSION)
+  set(LPAC_VERSION v0.0.0-unknown)
+  message(WARNING "Failed to determine LPAC_VERSION from Git tags. Using default version \"${LPAC_VERSION}\".")
+endif()
+
+configure_file(${SRC} ${DST} @ONLY)

src/CMakeLists.txt

@@ -17,6 +17,16 @@ set_target_properties(lpac PROPERTIES
 target_link_libraries(lpac euicc ${DL_LIBRARY})
 target_include_directories(lpac PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
 
+find_package(Git)
+add_custom_target(version
+    ${CMAKE_COMMAND}
+    -D SRC=${CMAKE_CURRENT_SOURCE_DIR}/version.h.in
+    -D DST=${CMAKE_CURRENT_SOURCE_DIR}/version.h
+    -D GIT_EXECUTABLE=${GIT_EXECUTABLE}
+    -P ${CMAKE_MODULE_PATH}/git-version.cmake
+)
+add_dependencies(lpac version)
+
 if(UNIX)
     install(TARGETS lpac RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
 endif()

src/applet/version.c

@@ -0,0 +1,14 @@
+#include "version.h"
+
+#include <main.h>
+
+static int applet_main(int argc, char **argv)
+{
+    jprint_success(cJSON_CreateString(LPAC_VERSION));
+    return 0;
+}
+
+struct applet_entry applet_version = {
+        .name = "version",
+        .main = applet_main,
+};

src/applet/version.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#include "../version.h"
+#include <applet.h>
+
+extern struct applet_entry applet_version;

src/main.c

@@ -14,12 +14,14 @@
 #include "applet/chip.h"
 #include "applet/profile.h"
 #include "applet/notification.h"
+#include "applet/version.h"
 
 static const struct applet_entry *applets[] = {
     &applet_dlsym_interface,
     &applet_chip,
     &applet_profile,
     &applet_notification,
+    &applet_version,
     NULL,
 };
 

src/version.h.in

@@ -0,0 +1,4 @@
+#ifndef LPAC_VERSION_H_
+#define LPAC_VERSION_H_
+#define LPAC_VERSION "@LPAC_VERSION@"
+#endif  /* LPAC_VERSION_H_ */