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

[Steffen Sledz <sledz@dresearch-fe.de>]

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

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