Print version information when the program starts

[dxsup]

Is your feature request related to a problem? Please describe.
Whenever an error occurs, we want to know clearly which version of codes the agent is on. But now there is no such information printed by the collector and only an outdated KINDLING_PROBE_VERSION: v0.1-2021-1221 printed by the probe. We can't know the exact versions of them now.

Describe the solution you'd like
The best version information is the combination of the release version and the commit revision number, IMO. We could insert these numbers as environment variables when we build the containers and print them periodically while the agent is running.

Additional context
Any ideas about how we could get this information are appreciated.

[zjuzzb]

I find a solution for adding build numbers from git, take a look at this.

[dxsup]

I find a solution for adding build numbers from git, take a look at this.

Looks great! I think it is what we want. We could insert it as a parameter when building the collector, like go build -ldflags -X main.githash=xxx. Do you have any idea about how we insert it into the probe?

[zjuzzb]

Looks great! I think it is what we want. We could insert it as a parameter when building the collector, like `go build -ldflags -X main.githash=xxx". Do you have any idea about how we insert it into the probe?

add_definitions(-DBUILD_NUMBER)
find_package(Git)
if(GIT_FOUND)
    execute_process(
            COMMAND ${GIT_EXECUTABLE} describe --match build
            OUTPUT_VARIABLE BUILD_NUMBER
            OUTPUT_STRIP_TRAILING_WHITESPACE)
    add_definitions(-DBUILD_NUMBER=\ "${BUILD_NUMBER}\")
endif()

Add this code into CMakeLists.txt of probe, then just use BUILD_NUMBER macro in the source code.

[dxsup]

add_definitions(-DBUILD_NUMBER)
find_package(Git)
if(GIT_FOUND)
    execute_process(
            COMMAND ${GIT_EXECUTABLE} describe --match build
            OUTPUT_VARIABLE BUILD_NUMBER
            OUTPUT_STRIP_TRAILING_WHITESPACE)
    add_definitions(-DBUILD_NUMBER=\ "${BUILD_NUMBER}\")
endif()

Add this code into CMakeLists.txt of probe, then just use BUILD_NUMBER macro in the source code.

But now we are compiling the probe using Bazel, is there any similar method? @jundizhou

[sugary199]

I haven't found a way to inject version information into a program with bazel. Maybe we can generate a header file with a .sh file like this

commit_ts=`git log -1 --format="%ct"`
commit_time=`date -d@$commit_ts +"%Y-%m-%d %H:%M:%S"`
current_time=`date +"%Y-%m-%d %H:%M:%S"`
git_version=`git log -1 --format="%h"`
build_number=`git describe`
sed  s/MYVERSION/"version: $build_number commit: $commit_time build: $current_time"/g version.h.tmp > version.h
make clean
make

There will be a macro in the generated header file

#ifndef _VERSION_
#define _VERSION_ "version: build01-5-g4e4dc12 commit: 2022-03-22 12:57:52 build: 2022-03-22 13:01:26"
#endif

Would it work in our project?

[dxsup]

The version of the probe is not needed after merging #264 because there is only one process now. The collector and the probe share the same codebase and the commit id has been printed by the collector.