[Buildroot] [PATCH] support/scripts/apply-patches.sh: do not blindly remove *.orig files

[Yann E. MORIN <yann.morin.1998@free.fr>]

Peter, All,

On 2020-10-06 20:56 +0200, Peter Korsgaard spake thusly:
> apply-patches currently blindly removes *.orig / .*.orig files as GNU patch
> by default writes these as backup files when patches only apply with fuzz.
> 
> This is unfortunate as package sources may contain files ending in .orig as
> well, breaking the build.  Luckily GNU patch can be told to not write these
> backup files using the --no-backup-if-mismatch option, so used that instead
> of the .orig removal step.
> 
> --no-backup-if-mismatch is supported since GNU patch 2.3.8 (1997-06-17) and
> busybox patch if built with CONFIG_DESKTOP, but E.G.  isn't supported by the
> BSD patch, so add logic to detect support for the flag and only use it if
> supported.
> 
> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
> ---
> Do we care about BSD patch / busybox patch w/ DESKTOP?  Should we just
> unconditionally use the flag?
> 
> We have a similar issue with *.rej.  GNU patch can be told to not write
> those with the -r - option (since GNU patch 2.6, Nov 2009), but it should
> normally also exit with a non-zero exit code for such sitations, so I am not
> sure the check is needed?

As discussed on IRC: I think we should require that patch suppot
--no-backup-if-mismatch, and bail out if not:

  - check for that in support/dependencies/check-host-patch.{mk.sh}

  - always use --no-backup-if-mismatch in apply-patch.sh

Regards,
Yann E. MORIN.

>  support/scripts/apply-patches.sh | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/support/scripts/apply-patches.sh b/support/scripts/apply-patches.sh
> index 66fef262ee..be61a94529 100755
> --- a/support/scripts/apply-patches.sh
> +++ b/support/scripts/apply-patches.sh
> @@ -40,6 +40,12 @@ if [ "$1" = "-s" ] ; then
>      shift
>  fi
>  
> +# does patch support --no-backup-if-mismatch (GNU, busybox w/DESKTOP)
> +if patch --no-backup-if-mismatch </dev/null 2>/dev/null; then
> +    # don't write backup files
> +    PATCH_ARGS="--no-backup-if-mismatch"
> +fi
> +
>  # Set directories from arguments, or use defaults.
>  builddir=${1-.}
>  patchdir=${2-../kernel-patches}
> @@ -119,7 +125,7 @@ function apply_patch {
>          exit 1
>      fi
>      echo "${path}/${patch}" >> ${builddir}/.applied_patches_list
> -    ${uncomp} "${path}/$patch" | patch -g0 -p1 -E -d "${builddir}" -t -N $silent
> +    ${uncomp} "${path}/$patch" | patch -g0 -p1 -E $PATCH_ARGS -d "${builddir}" -t -N $silent
>      if [ $? != 0 ] ; then
>          echo "Patch failed!  Please fix ${patch}!"
>          exit 1
> @@ -168,6 +174,3 @@ if [ "`find $builddir/ '(' -name '*.rej' -o -name '.*.rej' ')' -print`" ] ; then
>      echo "Aborting.  Reject files found."
>      exit 1
>  fi
> -
> -# Remove backup files
> -find $builddir/ '(' -name '*.orig' -o -name '.*.orig' ')' -exec rm -f {} \;
> -- 
> 2.20.1
> 
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> buildroot at busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot

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