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"""
(c) 2006-2013, Armin Rigo, Holger Krekel, Maciej Fijalkowski
"""
from __future__ import annotations
from typing import TYPE_CHECKING
from typing import Literal
from typing import cast
if TYPE_CHECKING:
from execnet.gateway_base import Channel
def serve_rsync(channel: Channel) -> None:
import os
import shutil
import stat
from hashlib import md5
destdir, options = cast("tuple[str, dict[str, object]]", channel.receive())
modifiedfiles = []
def remove(path: str) -> None:
assert path.startswith(destdir)
try:
os.unlink(path)
except OSError:
# assume it's a dir
shutil.rmtree(path, True)
def receive_directory_structure(path: str, relcomponents: list[str]) -> None:
try:
st = os.lstat(path)
except OSError:
st = None
msg = channel.receive()
if isinstance(msg, list):
if st and not stat.S_ISDIR(st.st_mode):
os.unlink(path)
st = None
if not st:
os.makedirs(path)
mode = msg.pop(0)
if mode:
# Ensure directories are writable, otherwise a
# permission denied error (EACCES) would be raised
# when attempting to receive read-only directory
# structures.
os.chmod(path, mode | 0o700)
entrynames = {}
for entryname in msg:
destpath = os.path.join(path, entryname)
receive_directory_structure(destpath, [*relcomponents, entryname])
entrynames[entryname] = True
if options.get("delete"):
for othername in os.listdir(path):
if othername not in entrynames:
otherpath = os.path.join(path, othername)
remove(otherpath)
elif msg is not None:
assert isinstance(msg, tuple)
checksum = None
if st:
if stat.S_ISREG(st.st_mode):
msg_mode, msg_mtime, msg_size = msg
if msg_size != st.st_size:
pass
elif msg_mtime != st.st_mtime:
f = open(path, "rb")
checksum = md5(f.read()).digest()
f.close()
elif msg_mode and msg_mode != st.st_mode:
os.chmod(path, msg_mode | 0o700)
return
else:
return # already fine
else:
remove(path)
channel.send(("send", (relcomponents, checksum)))
modifiedfiles.append((path, msg))
receive_directory_structure(destdir, [])
STRICT_CHECK = False # seems most useful this way for py.test
channel.send(("list_done", None))
for path, (mode, time, size) in modifiedfiles:
data = cast(bytes, channel.receive())
channel.send(("ack", path[len(destdir) + 1 :]))
if data is not None:
if STRICT_CHECK and len(data) != size:
raise OSError(f"file modified during rsync: {path!r}")
f = open(path, "wb")
f.write(data)
f.close()
try:
if mode:
os.chmod(path, mode)
os.utime(path, (time, time))
except OSError:
pass
del data
channel.send(("links", None))
msg = channel.receive()
while msg != 42:
# we get symlink
_type, relpath, linkpoint = cast(
"tuple[Literal['linkbase', 'link'], str, str]", msg
)
path = os.path.join(destdir, relpath)
try:
remove(path)
except OSError:
pass
if _type == "linkbase":
src = os.path.join(destdir, linkpoint)
else:
assert _type == "link", _type
src = linkpoint
os.symlink(src, path)
msg = channel.receive()
channel.send(("done", None))
if __name__ == "__channelexec__":
serve_rsync(channel) # type: ignore[name-defined] # noqa:F821
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