[Buildroot] Repository information during build

[Thomas Ruschival]

In a cmake project I use a git and some cmake-macros to extract the current
commit hash of the source code and generate a C file with the information.
This way the executable can print out with the revision.

Using Buildroot this aproach fails rather obviously. (Buildroot clones the
repository, checks out the requested branch/tag/commit and generates a
tarball without the git information which is used for build)

I extended the CMakeLists of the project, The git-revision can be also
passed as definition (cmake -DGIT_COMMIT_HASH=12345 ....) and cmake only
uses git to get the commit hash if it is not defined.

Is there a canonical way to access the git revision of a package in the
package.mk file to pass it to the build of the package?

I.e. how do I find out the revision of the "master" branch Buildroot used
to create the tarball?

Thanks in advance & Best regards
Thomas
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