[OE-core] does a normal OE kernel build negate the ability to generate a local version string?

[Martin Jansa]

On Fri, Apr 08, 2016 at 09:57:02AM -0400, Robert P. J. Day wrote:
> 
>   i was just playing with wind river linux 8 and trying to figure out
> why i couldn't generate a local version string that contained the git
> commit ID, so i zipped over to oe-core to see how it was done there,
> and it seems to be the same way, so can someone clarify that my
> understanding here is correct?
> 
>   normally, if i want to add the git commit ID ("-gxxxxxxxx") to the
> kernel version string so it's available via "uname", i'm used to
> selecting the kernel config option CONFIG_LOCALVERSION_AUTO, which
> uses:
> 
>  $ git rev-parse --verify HEAD
> 
> to extract the first 8 characters of the commit ID. so i selected that
> option, but wasn't getting that string.
> 
>   poking around further, i saw this in scripts/setlocalversion:
> 
> scm_version()
> {
>         local short
>         short=false
> 
>         cd "$srctree"
>         if test -e .scmversion; then
>                 cat .scmversion
>                 return
>         fi
>         ... snip ...
> 
> so if the file ".scmversion" exists, its contents are used instead.
> now *i* never set that file, but lo and behold, in the kernel source
> tree, there it was, empty, which explains why i wasn't getting any
> local version string.
> 
>   and where did that empty .scmversion file come from? i see this in
> kernel.bbclass:
> 
> kernel_do_configure() {
>         # fixes extra + in /lib/modules/2.6.37+
>         # $ scripts/setlocalversion . => +
>         # $ make kernelversion => 2.6.37
>         # $ make kernelrelease => 2.6.37+
>         touch ${B}/.scmversion ${S}/.scmversion    <---- there
>         ... snip ...
> 
> which clearly appears to touch that empty file. is that deliberate? is
> this an explicit decision by this bbclass file to prevent people from
> generating that local version string? am i reading all this correctly?

Yes, see
http://lists.openembedded.org/pipermail/openembedded-core/2011-December/053263.html
for more details

-- 
Martin 'JaMa' Jansa     jabber: Martin.Jansa at gmail.com
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