^{} what is it good for? (bitbake problem)

^{} what is it good for? (bitbake problem)

[Steffen Sledz]

We're are currently switching to daisy (incl. bitbake 1.22). There we hit the following problem.

We've a bbappend for linux-yocto-3.10 containing

--------------> snip <-----------------
SRC_URI +=  " \
    git://github.com/DFE/darmok.git;destsuffix=darmok;type=not-kmeta;tag=darmok_v0.10 \
"
--------------> snap <-----------------

This results in

--------------> snip <-----------------
NOTE: Error during finalise of /pm/sledz/hipos-dfe/openembedded-core/meta/recipes-kernel/linux/linux-yocto_3.10.bb
ERROR: ExpansionError during parsing /pm/sledz/hipos-dfe/openembedded-core/meta/recipes-kernel/linux/linux-yocto_3.10.bb: Failure expanding variable do_patch: ExpansionError: Failure expanding variable SRCPV, expression was ${@bb.fetch2.get_srcrev(d)} which triggered exception FetchError: Fetcher failure for URL: 'git://github.com/DFE/darmok.git;destsuffix=darmok;type=not-kmeta;tag=darmok_v0.10'. The command git ls-remote git://github.com/DFE/darmok.git refs/heads/darmok_v0.10 refs/tags/darmok_v0.10^{} gave empty output unexpectedly
--------------> snap <-----------------

And here's the output from some tests on the command line.

--------------> snip <-----------------
sledz@fensuse:/pm/sledz/hipos-dfe> git ls-remote git://github.com/DFE/darmok.git refs/heads/darmok_v0.10 refs/tags/darmok_v0.10^{}
sledz@fensuse:/pm/sledz/hipos-dfe> git ls-remote git://github.com/DFE/darmok.git refs/heads/darmok_v0.10 refs/tags/darmok_v0.10
f7f9073ea0c0c9a95808c9f65a29dcee9657226a        refs/tags/darmok_v0.10
--------------> snap <-----------------

They confirm the empty output if the command contains this magic ^{} at the end. The command works well if i remove this.

So what is this ^{} which comes from lib/bb/fetch2/git.py good for?
Or is this a remnant from a typo?

Steffen

-- 
DResearch Fahrzeugelektronik GmbH
Otto-Schmirgal-Str. 3, 10319 Berlin, Germany
Tel: +49 30 515932-237 mailto:sledz@dresearch-fe.de
Fax: +49 30 515932-299
Geschäftsführer: Dr. Michael Weber, Werner Mögle;
Amtsgericht Berlin Charlottenburg; HRB 130120 B;
Ust.-IDNr. DE273952058

Re: ^{} what is it good for? (bitbake problem)

[Olof Johansson]

On 14-06-04 10:06 +0200, Steffen Sledz wrote:
> So what is this ^{} which comes from lib/bb/fetch2/git.py good for?
> Or is this a remnant from a typo?

From git-rev-parse(1):

  <rev>^{}, e.g. v0.99.8^{}
      A suffix ^ followed by an empty brace pair means the object could be a
      tag, and dereference the tag recursively until a non-tag object is
      found.

Without this change, (some?) tag references would end up not
being considered to be on the requested branch by bitbake (by
default, master), as the tag objects themselves are not. The tags
therefore have to be resolved to a reference to a commit.

Given the description in git-rev-parse(1), it surprises me that
it doesn't work for some cases. I think it has to do with the tag
being annotated or not.

-- 
olofjn

Re: ^{} what is it good for? (bitbake problem)

[Steffen Sledz]

On 04.06.2014 10:29, Olof Johansson wrote:
> On 14-06-04 10:06 +0200, Steffen Sledz wrote:
>> So what is this ^{} which comes from lib/bb/fetch2/git.py good for?
>> Or is this a remnant from a typo?
> 
> From git-rev-parse(1):
> 
>   <rev>^{}, e.g. v0.99.8^{}
>       A suffix ^ followed by an empty brace pair means the object could be a
>       tag, and dereference the tag recursively until a non-tag object is
>       found.
> 
> Without this change, (some?) tag references would end up not
> being considered to be on the requested branch by bitbake (by
> default, master), as the tag objects themselves are not. The tags
> therefore have to be resolved to a reference to a commit.
> 
> Given the description in git-rev-parse(1), it surprises me that
> it doesn't work for some cases. I think it has to do with the tag
> being annotated or not.

You were right. The method works with annotated tags only. I've changed the related tags.

Thx,
Steffen

-- 
DResearch Fahrzeugelektronik GmbH
Otto-Schmirgal-Str. 3, 10319 Berlin, Germany
Tel: +49 30 515932-237 mailto:sledz@dresearch-fe.de
Fax: +49 30 515932-299
Geschäftsführer: Dr. Michael Weber, Werner Mögle;
Amtsgericht Berlin Charlottenburg; HRB 130120 B;
Ust.-IDNr. DE273952058