[yocto] Syntax for zero-padding a number in a recipe?

[Aaron Biver]

 [Sending again because I initially replied to Claudius only, and not
mailing list]

I found using back-ticks with printf also works in a recipe:

NUMBER = "1"
NUMBER_PADDED="FOO_`printf "02d" ${NUMBER}`_MOARFOO"

On Fri, Jun 28, 2019 at 4:48 PM Claudius Heine <ch at denx.de> wrote:

> Hi,
>
> Quoting Aaron Biver (2019-06-28 18:44:40)
> > Is there such a thing as zero padding a number in a recipe (or vice
> versa?
> > I'd be just as happy starting with a zero-padded number, and converting
> it
> > to non-zero-padded.
>
> In bitbake you could do this with inline python:
>
>         NUMBER = "1"
>         NUMBER_PADDED = "${@"{:02d}".format(d.getVar("NUMBER", True))}"
>         NUMBER_PADDED2 = "0012"
>         NUMBER2 = "${@str(int(d.getVar("NUMBER_PADDED2", True)))}"
>
> I have not tested this and it could possible be done more elegant, but
> it should work.
>
> regards,
> Claudius
>
> > The crux of the dilemma is that I must have zero-padding for file-naming,
> > but I CAN'T have zero padding in these numbers when I pass them to the C
> > code (or the C code treats them as octal).
> >
> > I'd like to start with:
> > VERSION_MAJOR="1"
> > VERSION_MINOR="19"
> >
> > And turn this into "01" and "19" for purposes of naming the output file
> > from the recipe.
> >
> > I've tried the bash-style printf -v, but the recipe kicks the printf
> lines
> > out with a parse error.
> >
> > VERSION_MAJOR="01"
> > VERSION_MINOR="19"
> >
> > VERSION_MAJOR_STR=""
> > VERSION_MINOR_STR=""
> >
> > printf -v VERSION_MAJOR_STR "%02d" VERSION_MAJOR
> > printf -v VERSION_MINOR_STR "%02d" VERSION_MINOR
> >
> >
> > --
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>
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