Re: [HTCondor-devel] New ld option --build-id stores a hash in the elf header

[Carl Edquist <edquist@xxxxxxxxxxx>]

The rpm has a %git_rev macro that makesrpm.sh populates - i don't know if 
that path is taken these days for the official builds.
Also a couple of tricky bits that come to mind - what do you do if there 
are local changes to the git repo; and, the build configure parameters can 
still vary even given a single commit.
Carl

On Tue, 1 Jun 2021, Tim Theisen via HTCondor-devel wrote:

> It doesn't get passed all the way in. However, I think that the git hash
> could be included in a file in the official source tarball. That way
> even downstream distributions would have the git sha in their builds.
>
> ...Tim
>
> On 6/1/21 9:14 AM, Greg Thain via HTCondor-devel wrote:
> > All:
> >
> > Spending a relaxing weekend reading through linker documentation, I
> > see that the gnu ld linker now has an option --build-id, which can
> > take a hex string which represents a hash, and store it in the
> > .gnu.notes.property section of the elf header.  Newer versions of the
> > "file" command display this hash.  I would suggest that all of our
> > builds try to set this to the git source sha, so we can have better
> > tracking of our binaries.  The nice thing about this is it isn't in
> > the binary at all, not even in the text segment, so there are fewer
> > "accidentally create a dependency that rebuilds the world" issues.
> >
> > Do we have the git hash handy when we do the rpm builds?
> >
> > -greg
> >
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> --
> Tim Theisen
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> HTCondor & Open Science Grid
> Center for High Throughput Computing
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