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revlog: add a mechanism to verify expected file position before appending...
revlog: add a mechanism to verify expected file position before appending If someone uses `hg debuglocks`, or some non-hg process writes to the .hg directory without respecting the locks, or if the repo's on a networked filesystem, it's possible for the revlog code to write out corrupted data. The form of this corruption can vary depending on what data was written and how that happened. We are in the "networked filesystem" case (though I've had users also do this to themselves with the "`hg debuglocks`" scenario), and most often see this with the changelog. What ends up happening is we produce two items (let's call them rev1 and rev2) in the .i file that have the same linkrev, baserev, and offset into the .d file, while the data in the .d file is appended properly. rev2's compressed_size is accurate for rev2, but when we go to decompress the data in the .d file, we use the offset that's recorded in the index file, which is the same as rev1, and attempt to decompress rev2.compressed_size bytes of rev1's data. This usually does not succeed. :) When using inline data, this also fails, though I haven't investigated why too closely. This shows up as a "patch decode" error. I believe what's happening there is that we're basically ignoring the offset field, getting the data properly, but since baserev != rev, it thinks this is a delta based on rev (instead of a full text) and can't actually apply it as such. For now, I'm going to make this an optional component and default it to entirely off. I may increase the default severity of this in the future, once I've enabled it for my users and we gain more experience with it. Luckily, most of my users have a versioned filesystem and can roll back to before the corruption has been written, it's just a hassle to do so and not everyone knows how (so it's a support burden). Users on other filesystems will not have that luxury, and this can cause them to have a corrupted repository that they are unlikely to know how to resolve, and they'll see this as a data-loss event. Refusing to create the corruption is a much better user experience. This mechanism is not perfect. There may be false-negatives (racy writes that are not detected). There should not be any false-positives (non-racy writes that are detected as such). This is not a mechanism that makes putting a repo on a networked filesystem "safe" or "supported", just *less* likely to cause corruption. Differential Revision: https://phab.mercurial-scm.org/D9952
Simon Sapin - - Load All Authors

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Cargo.toml
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Georges Racinet
rust-cpython: start cpython crate bindings...
 r41001 [package]
name = "hg-cpython"
version = "0.1.0"
authors = ["Georges Racinet <gracinet@anybox.fr>"]
Raphaël Gomès
rust: switch hg-core and hg-cpython to rust 2018 edition...
 r42828 edition = "2018"
Georges Racinet
rust-cpython: start cpython crate bindings...
 r41001
[lib]
name='rusthg'
crate-type = ["cdylib"]
[features]
Georges Racinet
rust-cpython: build and support for Python3...
 r41021 default = ["python27"]
Raphaël Gomès
rust: introduce `dirstate-tree` cargo feature...
 r46184 dirstate-tree = ["hg-core/dirstate-tree"]
Georges Racinet
rust-cpython: start cpython crate bindings...
 r41001
Yuya Nishihara
rust-cpython: prepare for writing tests that require libpython...
 r43583 # Features to build an extension module:
Yuya Nishihara
rust-cpython: drop direct dependency on python(27|3)_sys...
 r43485 python27 = ["cpython/python27-sys", "cpython/extension-module-2-7"]
Yuya Nishihara
rust-cpython: prepare for writing tests that require libpython...
 r43583 python3 = ["cpython/python3-sys", "cpython/extension-module"]
Georges Racinet
rust-cpython: build and support for Python3...
 r41021
Yuya Nishihara
rust-cpython: prepare for writing tests that require libpython...
 r43583 # Enable one of these features to build a test executable linked to libpython:
# e.g. cargo test --no-default-features --features python27-bin
python27-bin = ["cpython/python27-sys"]
python3-bin = ["cpython/python3-sys"]
Georges Racinet
rust-cpython: start cpython crate bindings...
 r41001
[dependencies]
Simon Sapin
copies-rust: move CPU-heavy Rust processing into a child thread...
 r47330 crossbeam-channel = "0.4"
Raphaël Gomès
rust-re2: add wrapper for calling Re2 from Rust...
 r44786 hg-core = { path = "../hg-core"}
Georges Racinet
rust-cpython: start cpython crate bindings...
 r41001 libc = '*'
Raphaël Gomès
rust-status: add trace-level logging for Rust status fallback for debugging...
 r45062 log = "0.4.8"
Raphaël Gomès
rust-cpython: switch logging facade from `simple_logger` to `env_logger`...
 r46090 env_logger = "0.7.1"
Georges Racinet
rust-cpython: start cpython crate bindings...
 r41001
[dependencies.cpython]
Raphaël Gomès
rust: update all dependencies...
 r45090 version = "0.4.1"
Georges Racinet
rust-cpython: start cpython crate bindings...
 r41001 default-features = false