view rust/hg-core/Cargo.toml @ 45095:8e04607023e5

procutil: ensure that procutil.std{out,err}.write() writes all bytes

Python 3 offers different kind of streams and it’s not guaranteed for all of
them that calling write() writes all bytes.

When Python is started in unbuffered mode, sys.std{out,err}.buffer are
instances of io.FileIO, whose write() can write less bytes for
platform-specific reasons (e.g. Linux has a 0x7ffff000 bytes maximum and could
write less if interrupted by a signal; when writing to Windows consoles, it’s
limited to 32767 bytes to avoid the "not enough space" error). This can lead to
silent loss of data, both when using sys.std{out,err}.buffer (which may in fact
not be a buffered stream) and when using the text streams sys.std{out,err}
(I’ve created a CPython bug report for that:
https://bugs.python.org/issue41221).

Python may fix the problem at some point. For now, we implement our own wrapper
for procutil.std{out,err} that calls the raw stream’s write() method until all
bytes have been written. We don’t use sys.std{out,err} for larger writes, so I
think it’s not worth the effort to patch them.

[package]
name = "hg-core"
version = "0.1.0"
authors = ["Georges Racinet <[e-mail]>"]
description = "Mercurial pure Rust core library, with no assumption on Python bindings (FFI)"
edition = "2018"

[lib]
name = "hg"

[dependencies]
byteorder = "1.3.4"
hex = "0.4.2"
lazy_static = "1.4.0"
memchr = "2.3.3"
rand = "0.7.3"
rand_pcg = "0.2.1"
rand_distr = "0.2.2"
rayon = "1.3.0"
regex = "1.3.9"
twox-hash = "1.5.0"
same-file = "1.0.6"
crossbeam = "0.7.3"
micro-timer = "0.3.0"
log = "0.4.8"

[dev-dependencies]
clap = "*"
memmap = "0.7.0"
pretty_assertions = "0.6.1"
tempfile = "3.1.0"