[Buildroot] [PATCH v3 3/3] merge_config.sh: Avoid false positive matches from comment lines

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

Nasser, All,

On 2018-11-14 10:41 +0330, Nasser Afshin spake thusly:
> From: Nasser Afshin <Afshin.Nasser@gmail.com>
> 
> We are using empty CONFIG_PREFIX_. This results in false positive match
> for comment lines when merging config fragments.
> 
> To avoid false positive reports, we use separate sed expressions and
> address comment lines explicitly.
> 
> This is actually is in the Linux kernel mainline (v4.20-rc2):
> 6bbe4385d035c6fac56f840a59861a0310ce137b
> ("kconfig: merge_config: avoid false positive matches from comment lines")
> 
> Signed-off-by: Nasser Afshin <Afshin.Nasser@gmail.com>
> Reviewed-by: Petr Vorel <petr.vorel@gmail.com>

Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

Regards,
Yann E. MORIN.

> ---
>  support/kconfig/merge_config.sh                    |  7 +++--
>  ...false-positive-matches-from-comment-lines.patch | 32 ++++++++++++++++++++++
>  support/kconfig/patches/series                     |  1 +
>  3 files changed, 37 insertions(+), 3 deletions(-)
>  create mode 100644 support/kconfig/patches/21-Avoid-false-positive-matches-from-comment-lines.patch
> 
> diff --git a/support/kconfig/merge_config.sh b/support/kconfig/merge_config.sh
> index 404ca3864f..14917806a3 100755
> --- a/support/kconfig/merge_config.sh
> +++ b/support/kconfig/merge_config.sh
> @@ -109,7 +109,8 @@ if [ ! -r "$INITFILE" ]; then
>  fi
>  
>  MERGE_LIST=$*
> -SED_CONFIG_EXP="s/^\(# \)\{0,1\}\(${CONFIG_PREFIX}[a-zA-Z0-9_]*\)[= ].*/\2/p"
> +SED_CONFIG_EXP1="s/^\(${CONFIG_PREFIX}[a-zA-Z0-9_]*\)=.*/\1/p"
> +SED_CONFIG_EXP2="s/^# \(${CONFIG_PREFIX}[a-zA-Z0-9_]*\) is not set$/\1/p"
>  
>  TMP_FILE=$(mktemp -t .tmp.config.XXXXXXXXXX)
>  
> @@ -123,7 +124,7 @@ for MERGE_FILE in $MERGE_LIST ; do
>  		echo "The merge file '$MERGE_FILE' does not exist.  Exit." >&2
>  		exit 1
>  	fi
> -	CFG_LIST=$(sed -n "$SED_CONFIG_EXP" $MERGE_FILE)
> +	CFG_LIST=$(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $MERGE_FILE)
>  
>  	for CFG in $CFG_LIST ; do
>  		grep -q -w $CFG $TMP_FILE || continue
> @@ -166,7 +167,7 @@ make KCONFIG_ALLCONFIG=$TMP_FILE $EXTERNAL_ARG $OUTPUT_ARG $ALLTARGET
>  
>  
>  # Check all specified config values took (might have missed-dependency issues)
> -for CFG in $(sed -n "$SED_CONFIG_EXP" $TMP_FILE); do
> +for CFG in $(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $TMP_FILE); do
>  
>  	REQUESTED_VAL=$(grep -w -e "$CFG" $TMP_FILE)
>  	ACTUAL_VAL=$(grep -w -e "$CFG" "$KCONFIG_CONFIG")
> diff --git a/support/kconfig/patches/21-Avoid-false-positive-matches-from-comment-lines.patch b/support/kconfig/patches/21-Avoid-false-positive-matches-from-comment-lines.patch
> new file mode 100644
> index 0000000000..c11144e47e
> --- /dev/null
> +++ b/support/kconfig/patches/21-Avoid-false-positive-matches-from-comment-lines.patch
> @@ -0,0 +1,32 @@
> +Index: kconfig/merge_config.sh
> +===================================================================
> +--- kconfig.orig/merge_config.sh
> ++++ kconfig/merge_config.sh
> +@@ -109,7 +109,8 @@ if [ ! -r "$INITFILE" ]; then
> + fi
> + 
> + MERGE_LIST=$*
> +-SED_CONFIG_EXP="s/^\(# \)\{0,1\}\(${CONFIG_PREFIX}[a-zA-Z0-9_]*\)[= ].*/\2/p"
> ++SED_CONFIG_EXP1="s/^\(${CONFIG_PREFIX}[a-zA-Z0-9_]*\)=.*/\1/p"
> ++SED_CONFIG_EXP2="s/^# \(${CONFIG_PREFIX}[a-zA-Z0-9_]*\) is not set$/\1/p"
> + 
> + TMP_FILE=$(mktemp -t .tmp.config.XXXXXXXXXX)
> + 
> +@@ -123,7 +124,7 @@ for MERGE_FILE in $MERGE_LIST ; do
> + 		echo "The merge file '$MERGE_FILE' does not exist.  Exit." >&2
> + 		exit 1
> + 	fi
> +-	CFG_LIST=$(sed -n "$SED_CONFIG_EXP" $MERGE_FILE)
> ++	CFG_LIST=$(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $MERGE_FILE)
> + 
> + 	for CFG in $CFG_LIST ; do
> + 		grep -q -w $CFG $TMP_FILE || continue
> +@@ -166,7 +167,7 @@ make KCONFIG_ALLCONFIG=$TMP_FILE $EXTERN
> + 
> + 
> + # Check all specified config values took (might have missed-dependency issues)
> +-for CFG in $(sed -n "$SED_CONFIG_EXP" $TMP_FILE); do
> ++for CFG in $(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $TMP_FILE); do
> + 
> + 	REQUESTED_VAL=$(grep -w -e "$CFG" $TMP_FILE)
> + 	ACTUAL_VAL=$(grep -w -e "$CFG" "$KCONFIG_CONFIG")
> diff --git a/support/kconfig/patches/series b/support/kconfig/patches/series
> index be8627db13..e5a6f69d8f 100644
> --- a/support/kconfig/patches/series
> +++ b/support/kconfig/patches/series
> @@ -9,3 +9,4 @@
>  18-merge-config.sh-create-temporary-files-in-tmp.patch
>  19-merge_config.sh-add-br2-external-support.patch
>  20-merge_config.sh-Allow-to-define-config-prefix.patch
> +21-Avoid-false-positive-matches-from-comment-lines.patch
> -- 
> 2.15.0
> 
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