scripts: kconfig: merge_config.sh: pass output file as awk variable

The refactoring commit 5fa9b82cbcfc5 ("scripts: kconfig:
merge_config.sh: refactor from shell/sed/grep to awk") passes
$TMP_FILE.new as ARGV[3] to awk, using it as both an output destination
and an input file argument. When the base file is empty, nothing is
written to ARGV[3] during processing, so awk fails trying to open it
for reading:

    awk: cmd. line:52: fatal: cannot open file
    `./.tmp.config.grcQin34jb.new' for reading: No such file or directory
    mv: cannot stat './.tmp.config.grcQin34jb.new': No such file or directory

Pass the output path via -v outfile instead and drop the FILENAME ==
ARGV[3] { nextfile }.

Fixes: 5fa9b82cbcfc5 ("scripts: kconfig: merge_config.sh: refactor from shell/sed/grep to awk")
Signed-off-by: Daniel Gomez <da.gomez@samsung.com>
Link: https://patch.msgid.link/20260310-fixes-merge-config-v1-1-beaeeaded6bd@samsung.com
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

diff --git a/scripts/kconfig/merge_config.sh b/scripts/kconfig/merge_config.sh
index 073c6bec5245e9b85ae1bc3d2663ae99092fc2ba..45e6400c68b6bdbcd255b532ee03edda35477cec 100755 (executable)
--- a/scripts/kconfig/merge_config.sh
+++ b/scripts/kconfig/merge_config.sh
@@ -151,6 +151,7 @@ for ORIG_MERGE_FILE in $MERGE_LIST ; do
        if ! "$AWK" -v prefix="$CONFIG_PREFIX" \
                -v warnoverride="$WARNOVERRIDE" \
                -v strict="$STRICT" \
+               -v outfile="$TMP_FILE.new" \
                -v builtin="$BUILTIN" \
                -v warnredun="$WARNREDUN" '
        BEGIN {
@@ -212,7 +213,7 @@ for ORIG_MERGE_FILE in $MERGE_LIST ; do
 
                # Not a config or not in merge file - keep it
                if (cfg == "" || !(cfg in merge_cfg)) {
-                       print $0 >> ARGV[3]
+                       print $0 >> outfile
                        next
                }
 
@@ -222,7 +223,7 @@ for ORIG_MERGE_FILE in $MERGE_LIST ; do
                # BUILTIN: do not demote y to m
                if (builtin == "true" && new_val ~ /=m$/ && prev_val ~ /=y$/) {
                        warn_builtin(cfg, prev_val, new_val)
-                       print $0 >> ARGV[3]
+                       print $0 >> outfile
                        skip_merge[merge_cfg_line[cfg]] = 1
                        next
                }
@@ -235,7 +236,7 @@ for ORIG_MERGE_FILE in $MERGE_LIST ; do
 
                # "=n" is the same as "is not set"
                if (prev_val ~ /=n$/ && new_val ~ / is not set$/) {
-                       print $0 >> ARGV[3]
+                       print $0 >> outfile
                        next
                }
 
@@ -246,25 +247,20 @@ for ORIG_MERGE_FILE in $MERGE_LIST ; do
                }
        }
 
-       # output file, skip all lines
-       FILENAME == ARGV[3] {
-               nextfile
-       }
-
        END {
                # Newline in case base file lacks trailing newline
-               print "" >> ARGV[3]
+               print "" >> outfile
                # Append merge file, skipping lines marked for builtin preservation
                for (i = 1; i <= merge_total; i++) {
                        if (!(i in skip_merge)) {
-                               print merge_lines[i] >> ARGV[3]
+                               print merge_lines[i] >> outfile
                        }
                }
                if (strict_violated) {
                        exit 1
                }
        }' \
-       "$ORIG_MERGE_FILE" "$TMP_FILE" "$TMP_FILE.new"; then
+       "$ORIG_MERGE_FILE" "$TMP_FILE"; then
                # awk exited non-zero, strict mode was violated
                STRICT_MODE_VIOLATED=true
        fi