Create reproducible tar file

vendor_rust.py

@@ -2,7 +2,6 @@
 """Vendor PyCA cryptography's Rust crates
 """
 import argparse
-import glob
 import os
 import re
 import tarfile
@@ -28,6 +27,37 @@ def cargo(cmd, manifest):
     )
 
 
+def tar_reset(tarinfo):
+    """Reset user, group, mtime, and mode to create reproducible tar"""
+    tarinfo.uid = 0
+    tarinfo.gid = 0
+    tarinfo.uname = "root"
+    tarinfo.gname = "root"
+    tarinfo.mtime = 0
+    if tarinfo.type == tarfile.DIRTYPE:
+        tarinfo.mode = 0o755
+    else:
+        tarinfo.mode = 0o644
+    if tarinfo.pax_headers:
+        raise ValueError(tarinfo.name, tarinfo.pax_headers)
+    return tarinfo
+
+
+def tar_reproducible(tar, basedir):
+    """Create reproducible tar file"""
+
+    content = [basedir]
+    for root, dirs, files in os.walk(basedir):
+        for directory in dirs:
+            content.append(os.path.join(root, directory))
+        for filename in files:
+            content.append(os.path.join(root, filename))
+    content.sort()
+
+    for fn in content:
+        tar.add(fn, filter=tar_reset, recursive=False, arcname=fn)
+
+
 def main():
     args = parser.parse_args()
     spec = args.spec
@@ -70,7 +100,7 @@ def main():
 
     print("\nCreating tar ball...", file=sys.stderr)
     with tarfile.open(vendor_file, "x:bz2") as tar:
-        tar.add(VENDOR_DIR)
+        tar_reproducible(tar, VENDOR_DIR)
 
     # remove vendor dir
     shutil.rmtree(VENDOR_DIR)