linux-kernel - [for-next][PATCH 1/2] ktest.pl: Process variables within variables

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Date: Fri, 15 Mar 2024 12:46:02 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org
Cc: "John Warthog9 Hawley" <warthog9@...nel.org>
Subject: [for-next][PATCH 1/2] ktest.pl: Process variables within variables

From: Steven Rostedt <rostedt@...dmis.org>

Allow a variable to contain another variable. This will allow the
${shell <command>} to have its command include variables.

Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 tools/testing/ktest/ktest.pl | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index 829f5bdfd2e4..4383729e0fc2 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -792,13 +792,13 @@ sub process_variables {
     my $retval = "";
 
     # We want to check for '\', and it is just easier
-    # to check the previous characet of '$' and not need
+    # to check the previous character of '$' and not need
     # to worry if '$' is the first character. By adding
     # a space to $value, we can just check [^\\]\$ and
     # it will still work.
     $value = " $value";
 
-    while ($value =~ /(.*?[^\\])\$\{(.*?)\}(.*)/) {
+    while ($value =~ /(.*?[^\\])\$\{([^\{]*?)\}(.*)/) {
 	my $begin = $1;
 	my $var = $2;
 	my $end = $3;
@@ -818,16 +818,20 @@ sub process_variables {
 	    # we simple convert to 0
 	    $retval = "${retval}0";
 	} else {
-	    # put back the origin piece.
-	    $retval = "$retval\$\{$var\}";
+	    # put back the origin piece, but with $#### to not reprocess it
+	    $retval = "$retval\$####\{$var\}";
 	    # This could be an option that is used later, save
 	    # it so we don't warn if this option is not one of
 	    # ktests options.
 	    $used_options{$var} = 1;
 	}
-	$value = $end;
+	$value = "$retval$end";
+	$retval = "";
     }
-    $retval = "$retval$value";
+    $retval = $value;
+
+    # Convert the saved variables with $####{var} back to ${var}
+    $retval =~ s/\$####/\$/g;
 
     # remove the space added in the beginning
     $retval =~ s/ //;
-- 
2.43.0