view rust/hgcli/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 = "hgcli"
version = "0.1.0"
build = "build.rs"
authors = ["Gregory Szorc <[e-mail]>"]
edition = "2018"
license = "GPL-2.0"
readme = "README.md"

[[bin]]
name = "hg"
path = "src/main.rs"

[dependencies]
jemallocator-global = { version = "0.3", optional = true }
pyembed = { git = "https://github.com/indygreg/PyOxidizer.git", rev = "c772a1379c3026314eda1c8ea244b86c0658951d", default-features=false }

[features]
default = ["build-mode-pyoxidizer-exe"]
jemalloc = ["jemallocator-global", "pyembed/jemalloc"]
build-mode-pyoxidizer-exe = ["pyembed/build-mode-pyoxidizer-exe"]
build-mode-prebuilt-artifacts = ["pyembed/build-mode-prebuilt-artifacts"]
cpython-link-unresolved-static = ["pyembed/cpython-link-unresolved-static"]
cpython-link-default = ["pyembed/cpython-link-default"]