[OE-core] How to patch a local file in a simple elegant way?

[Richard Purdie]

On Tue, 2020-02-04 at 18:26 +1100, JH wrote:
> Hello,
> 
> Is anyway to patch a local file without committing to the git source?
> I did not realize a local patch is that hard or if it is impossible.
> 
> In my OE build, I want to make a patch file for mx6ullevk.h in
> meta-freescale/recipes-bsp/u-boot/u-boot-imx_2017.03.bb, to customize
> mtdparts and bootargs as I could not find a simple way to do it using
> bbapaend, I did not and I don't want to submit the patch to the git
> source. So I got a bunch of errors:
> 
> ERROR: u-boot-imx-2017.03-r0 do_fetch: Fetcher failure: Unable to
> find
> revision 8be98e9322040c655b9e5c9fb2c494e002e3fad9 in branch
> imx_v2017.03_4.9.123_imx8mm_gafile://mx6ullevk.patch even from
> upstream
> ERROR: u-boot-imx-2017.03-r0 do_fetch: Fetcher failure for URL:
> 'git://source.codeaurora.org/external/imx/uboot-
> imx.git;protocol=https;branch=imx_v2017.03_4.9.123_imx8mm_ga
> file://mx6ullevk.patch'.
> Unable to fetch URL from any source.
> ERROR: u-boot-imx-2017.03-r0 do_fetch: Function failed: base_do_fetch
> ERROR: Logfile of failure stored in:
> /build/Installation/sa_platform_build/Source/Yocto/build/tmp-
> glibc/work/solar-oe-linux-gnueabi/u-boot-imx/2017.03-
> r0/temp/log.do_fetch.25780
> ERROR: Task (/build/Installation/sa_platform_build/Source/Yocto/oe-
> core/../meta-freescale/recipes-bsp/u-boot/u-boot-
> imx_2017.03.bb:do_fetch)
> failed with exit code '1'

I think your approach was right, you just need to fix the whitespace
issue. Note how the above error says:

123_imx8mm_gafile://mx6u

You need a space before the "file://"

so probably

_append = " file://xxx"

instead of what I'd guess you had:

_append = "file://xxx"

Cheers,

Richard