commit 45fcec44287881aff273c9a5eb366e7ceb2a97f8 Author: David Fifield <david@bamsoftware.com> Date: Mon Dec 2 04:00:10 2013 +0000 Add pyc-timestamp.sh to stomp .pyc timestamps. --- gitian/build-helpers/pyc-timestamp.sh | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/gitian/build-helpers/pyc-timestamp.sh b/gitian/build-helpers/pyc-timestamp.sh new file mode 100755 index 0000000..e092268 --- /dev/null +++ b/gitian/build-helpers/pyc-timestamp.sh @@ -0,0 +1,18 @@ +#!/bin/bash +# Usage: pyc-timestamp.sh "2001-01-01" FILENAMES... +# Overwrite (in place) the timestamp in .pyc Python bytecode files. +# +# http://hg.python.org/cpython/file/2.7/Lib/py_compile.py#l123 +# http://nedbatchelder.com/blog/200804/the_structure_of_pyc_files.html +# http://benno.id.au/blog/2013/01/15/python-determinism + +TIMESPEC="$1" +shift + +hex=$(printf 0x%08x $(date +%s --date="$TIMESPEC")) +# Write little-endian. +esc=$(printf "\\\\x%02x\\\\x%02x\\\\x%02x\\\\x%02x" $(($hex&0xff)) $((($hex>>8)&0xff)) $((($hex>>16)&0xff)) $((($hex>>24)&0xff))) +for filename in "$@"; do + echo $filename + echo -n -e "$esc" | dd of="$filename" bs=1 seek=4 conv=notrunc +done