1 files changed, 108 insertions, 0 deletions
diff --git a/scripts/tst-ld-trace.py b/scripts/tst-ld-trace.py
new file mode 100755
index 0000000000..f5a4028003
--- /dev/null
+++ b/scripts/tst-ld-trace.py
@@ -0,0 +1,108 @@
+#!/usr/bin/python3
+# Dump the output of LD_TRACE_LOADED_OBJECTS in architecture neutral format.
+# Copyright (C) 2022 Free Software Foundation, Inc.
+# Copyright The GNU Toolchain Authors.
+# This file is part of the GNU C Library.
+#
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+import argparse
+import os
+import subprocess
+import sys
+
+try:
+    subprocess.run
+except:
+    class _CompletedProcess:
+        def __init__(self, args, returncode, stdout=None, stderr=None):
+            self.args = args
+            self.returncode = returncode
+            self.stdout = stdout
+            self.stderr = stderr
+
+    def _run(*popenargs, input=None, timeout=None, check=False, **kwargs):
+        assert(timeout is None)
+        with subprocess.Popen(*popenargs, **kwargs) as process:
+            try:
+                stdout, stderr = process.communicate(input)
+            except:
+                process.kill()
+                process.wait()
+                raise
+            returncode = process.poll()
+            if check and returncode:
+                raise subprocess.CalledProcessError(returncode, popenargs)
+        return _CompletedProcess(popenargs, returncode, stdout, stderr)
+
+    subprocess.run = _run
+
+def is_vdso(lib):
+    return lib.startswith('linux-gate') or lib.startswith('linux-vdso')
+
+
+def parse_trace(cmd, fref):
+    new_env = os.environ.copy()
+    new_env['LD_TRACE_LOADED_OBJECTS'] = '1'
+    trace_out = subprocess.run(cmd, stdout=subprocess.PIPE, check=True,
+                               universal_newlines=True, env=new_env).stdout
+    trace = []
+    for line in trace_out.splitlines():
+        line = line.strip()
+        if is_vdso(line):
+            continue
+        fields = line.split('=>' if '=>' in line else ' ')
+        lib = os.path.basename(fields[0].strip())
+        if lib.startswith('ld'):
+            lib = 'ld'
+        elif lib.startswith('libc'):
+            lib = 'libc'
+        found = 1 if fields[1].strip() != 'not found' else 0
+        trace += ['{} {}'.format(lib, found)]
+    trace = sorted(trace)
+
+    reference = sorted(line.replace('\n','') for line in fref.readlines())
+
+    ret = 0 if trace == reference else 1
+    if ret != 0:
+        for i in reference:
+            if i not in trace:
+                print("Only in {}: {}".format(fref.name, i))
+        for i in trace:
+            if i not in reference:
+                print("Only in trace: {}".format(i))
+
+    sys.exit(ret)
+
+
+def get_parser():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument('command',
+                        help='comand to run')
+    parser.add_argument('reference',
+                        help='reference file to compare')
+    return parser
+
+
+def main(argv):
+    parser = get_parser()
+    opts = parser.parse_args(argv)
+    with open(opts.reference, 'r') as fref:
+        # Remove the initial 'env' command.
+        parse_trace(opts.command.split()[1:], fref)
+
+
+if __name__ == '__main__':
+    main(sys.argv[1:])