contrib: macdeploy: make gen-sdk deterministic

1 files changed, 8 insertions, 1 deletions

diff --git a/contrib/macdeploy/gen-sdk b/contrib/macdeploy/gen-sdk
index ebef1d2db0..f1d18fae70 100755
--- a/contrib/macdeploy/gen-sdk
+++ b/contrib/macdeploy/gen-sdk
@@ -75,14 +75,21 @@ def run():
                 tarinfo.name = str(pathlib.Path(alt_base_dir, tarinfo.name))
             if tarinfo.linkname and tarinfo.linkname.startswith("./"):
                 tarinfo.linkname = str(pathlib.Path(alt_base_dir, tarinfo.linkname))
+            # make metadata deterministic
+            tarinfo.mtime = 0
+            tarinfo.uid, tarinfo.uname =  0, ''
+            tarinfo.gid, tarinfo.gname = 0, ''
+            # don't use isdir() as there are also executable files present
+            tarinfo.mode = 0o0755 if tarinfo.mode & 0o0100 else 0x0644
             return tarinfo
         with cd(dir_to_add):
+            # recursion already adds entries in sorted order
             tarfp.add(".", recursive=True, filter=change_tarinfo_base)
 
     print("Creating output .tar.gz file...")
     with out_sdktgz_path.open("wb") as fp:
         with gzip.GzipFile(fileobj=fp, mode='wb', compresslevel=9, mtime=0) as gzf:
-            with tarfile.open(mode="w", fileobj=gzf) as tarfp:
+            with tarfile.open(mode="w", fileobj=gzf, format=tarfile.GNU_FORMAT) as tarfp:
                 print("Adding MacOSX SDK {} files...".format(sdk_version))
                 tarfp_add_with_base_change(tarfp, sdk_dir, out_name)
                 print("Adding libc++ headers...")