perf test: Add header shell test

Add a shell test that sanity checks perf data and pipe mode produce
expected header fields.

Signed-off-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20250619002555.100896-1-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/tests/shell/header.sh

@@ -0,0 +1,74 @@
+#!/bin/bash
+# perf header tests
+# SPDX-License-Identifier: GPL-2.0
+
+set -e
+
+err=0
+perfdata=$(mktemp /tmp/__perf_test_header.perf.data.XXXXX)
+script_output=$(mktemp /tmp/__perf_test_header.perf.data.XXXXX.script)
+
+cleanup() {
+  rm -f "${perfdata}"
+  rm -f "${perfdata}".old
+  rm -f "${script_output}"
+
+  trap - EXIT TERM INT
+}
+
+trap_cleanup() {
+  echo "Unexpected signal in ${FUNCNAME[1]}"
+  cleanup
+  exit 1
+}
+trap trap_cleanup EXIT TERM INT
+
+check_header_output() {
+  declare -a fields=(
+    "captured"
+    "hostname"
+    "os release"
+    "arch"
+    "cpuid"
+    "nrcpus"
+    "event"
+    "cmdline"
+    "perf version"
+    "sibling (cores|dies|threads)"
+    "sibling threads"
+    "total memory"
+  )
+  for i in "${fields[@]}"
+  do
+    if ! grep -q -E "$i" "${script_output}"
+    then
+      echo "Failed to find expect $i in output"
+      err=1
+    fi
+  done
+}
+
+test_file() {
+  echo "Test perf header file"
+
+  perf record -o "${perfdata}" -g -- perf test -w noploop
+  perf report --header-only -I -i "${perfdata}" > "${script_output}"
+  check_header_output
+
+  echo "Test perf header file [Done]"
+}
+
+test_pipe() {
+  echo "Test perf header pipe"
+
+  perf record -o - -g -- perf test -w noploop | perf report --header-only -I -i - > "${script_output}"
+  check_header_output
+
+  echo "Test perf header pipe [Done]"
+}
+
+test_file
+test_pipe
+
+cleanup
+exit $err