114 lines
2.9 KiB
Python
114 lines
2.9 KiB
Python
import os
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import shutil
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import tempfile
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from atomicwrites import AtomicWriter
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def mkdirs_exists_ok(path):
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if path.startswith('http://') or path.startswith('https://'):
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raise ValueError('URL path')
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try:
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os.makedirs(path)
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except OSError:
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if not os.path.isdir(path):
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raise
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def rm_not_exists_ok(path):
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try:
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os.remove(path)
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except OSError:
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if os.path.exists(path):
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raise
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def rm_tree_or_link(path):
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if os.path.islink(path):
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os.unlink(path)
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elif os.path.isdir(path):
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shutil.rmtree(path)
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def get_tmpdir_on_same_filesystem(path):
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normpath = os.path.normpath(path)
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parts = normpath.split("/")
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if len(parts) > 1 and parts[1] == "scratch":
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return "/scratch/tmp"
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elif len(parts) > 2 and parts[2] == "runner":
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return f"/{parts[1]}/runner/tmp"
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return "/tmp"
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class NamedTemporaryDir():
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def __init__(self, temp_dir=None):
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self._path = tempfile.mkdtemp(dir=temp_dir)
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@property
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def name(self):
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return self._path
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def close(self):
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shutil.rmtree(self._path)
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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self.close()
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class CallbackReader:
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"""Wraps a file, but overrides the read method to also
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call a callback function with the number of bytes read so far."""
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def __init__(self, f, callback, *args):
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self.f = f
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self.callback = callback
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self.cb_args = args
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self.total_read = 0
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def __getattr__(self, attr):
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return getattr(self.f, attr)
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def read(self, *args, **kwargs):
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chunk = self.f.read(*args, **kwargs)
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self.total_read += len(chunk)
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self.callback(*self.cb_args, self.total_read)
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return chunk
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def _get_fileobject_func(writer, temp_dir):
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def _get_fileobject():
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return writer.get_fileobject(dir=temp_dir)
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return _get_fileobject
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def monkeypatch_os_link():
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# This is neccesary on EON/C2, where os.link is patched out of python
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if not hasattr(os, 'link'):
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from cffi import FFI
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ffi = FFI()
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ffi.cdef("int link(const char *oldpath, const char *newpath);")
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libc = ffi.dlopen(None)
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def link(src, dest):
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return libc.link(src.encode(), dest.encode())
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os.link = link
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def atomic_write_on_fs_tmp(path, **kwargs):
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"""Creates an atomic writer using a temporary file in a temporary directory
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on the same filesystem as path.
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"""
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# TODO(mgraczyk): This use of AtomicWriter relies on implementation details to set the temp
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# directory.
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monkeypatch_os_link()
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writer = AtomicWriter(path, **kwargs)
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return writer._open(_get_fileobject_func(writer, get_tmpdir_on_same_filesystem(path)))
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def atomic_write_in_dir(path, **kwargs):
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"""Creates an atomic writer using a temporary file in the same directory
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as the destination file.
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"""
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monkeypatch_os_link()
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writer = AtomicWriter(path, **kwargs)
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return writer._open(_get_fileobject_func(writer, os.path.dirname(path)))
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