version: add git top info

Generate PX4_GIT_VERSION_TOP define in build time to get
count of commits on top of last tag.
This info is used for FC-OTA update mechanism.

Tools/generate_basic_build_info.sh

@@ -16,7 +16,11 @@ if [ -z "${1:-}" ]; then
 fi
 
 repo=$(basename `git rev-parse --show-toplevel`)
+# short sha for compatibility
 sha=$(git rev-parse --short HEAD)
+# separate px4_sha for long sha
+px4_sha=$(git rev-parse HEAD)
+
 # github variables are set only in github
 if [ -z "${GITHUB_SERVER_URL:-}" ] || [ -z "${GITHUB_REPOSITORY:-}" ] || [ -z "${GITHUB_RUN_ID:-}" ]; then
 	build_url="undefined"
@@ -28,6 +32,7 @@ fi
 declare -A build_info
 build_info["reponame"]=${repo}
 build_info["sha"]=${sha}
+build_info["px4_firmware_sha"]=${px4_sha}
 build_info["build_url"]=${build_url}
 
 # loop thru associative array and print key value pairs

src/lib/version/px_update_git_header.py

@@ -107,6 +107,16 @@
     if not tag_or_branch.startswith('release-'):
         tag_or_branch = 'master'
 
+# count commits since last tag
+# git log --oneline $(git describe --tags --abbrev=0)..HEAD | wc -l
+# this has to be ran with shell=True because if uses $() subshell
+try:
+    git_tag_top = subprocess.check_output('git log --oneline $(git describe --tags --abbrev=0)..HEAD | wc -l',
+                                           shell=True,
+                                           stderr=subprocess.STDOUT).decode('utf-8').strip()
+except:
+    git_tag_top = 0
+
 # build timestamp in epoch format
 build_timestamp = subprocess.check_output('date -u +%s'.split(),
                                           stderr=subprocess.STDOUT).decode('utf-8').strip()
@@ -119,6 +129,7 @@
 #define PX4_GIT_OEM_VERSION_STR  "{oem_tag}"
 
 #define PX4_GIT_TAG_OR_BRANCH_NAME "{tag_or_branch}" // special variable: git tag, release or master branch
+#define PX4_GIT_VERSION_TOP {git_tag_top}
 #define PX4_BUILD_TIME {build_timestamp}
 """
 

src/lib/version/version.c

@@ -242,6 +242,11 @@ uint32_t px4_firmware_vendor_version(void)
 	return version_tag_to_vendor_version_number(PX4_GIT_TAG_STR);
 }
 
+uint32_t px4_firmware_git_top_number(void)
+{
+	return PX4_GIT_VERSION_TOP;
+}
+
 const char *px4_firmware_git_branch(void)
 {
 	return PX4_GIT_BRANCH_NAME;

src/lib/version/version.h

@@ -141,6 +141,12 @@ __EXPORT uint32_t version_tag_to_vendor_version_number(const char *tag);
  */
 __EXPORT uint32_t px4_firmware_vendor_version(void);
 
+/**
+ * get the PX4 Firmware vendor version git tag top number
+ * @return number of git commits after git tag
+ */
+__EXPORT uint32_t px4_firmware_git_top_number(void);
+
 /**
  * get the board version (last 8 bytes should be silicon ID, if any)
  */