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- #!/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
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