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M13.0: honor ProxyCommand=none (FR-59)#5

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feature/m13-0-proxycommand-none
May 4, 2026
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M13.0: honor ProxyCommand=none (FR-59)#5
UnbreakableMJ merged 1 commit into
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feature/m13-0-proxycommand-none

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@UnbreakableMJ UnbreakableMJ commented May 4, 2026

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Summary

OpenSSH's ProxyCommand none cancels a parent block's ProxyCommand without ssh_config surgery. The resolver now recognizes the literal single-token none (case-insensitive) and preserves it as Some(\none`)` (lower-cased) so:

  1. First-occurrence-wins shields it from a later wildcard block's ProxyCommand override.
  2. gitway config show prints proxycommand none faithfully (matches ssh -G).
  3. The spawn path (M13.2, follow-up) recognizes the literal and treats the host as a direct connection.

Multi-word commands that happen to contain the substring none are NOT treated as the disable sentinel — only the SOLE argument case triggers it.

Tests

  • +4 unit tests in ssh_config::resolver::tests (preserved as literal, case-insensitive normalization, override-later-wildcard, multi-word negative case).
  • +1 matrix YAML fixture (10_proxy_command_none.yaml).
  • 157 lib tests green, 0 failures.

Test plan

  • CI passes (Linux/macOS/Windows + MSRV 1.88).
  • cargo fmt / cargo clippy --all-targets -- -D warnings clean.
  • cargo test --lib --tests --locked green.

Plan: M13.0 of let-us-plan-on-bright-cosmos.md.

🤖 Generated with Claude Code

@UnbreakableMJ
feat(ssh_config): M13.0 — honor ProxyCommand=none (FR-59)
99e404b 
OpenSSH's `ProxyCommand none` cancels a parent block's ProxyCommand
without ssh_config surgery. The resolver now recognizes the literal
single-token `none` (case-insensitive) and:

1. Preserves it as Some("none") (lower-cased) so that the existing
   first-occurrence-wins rule (already implemented via the
   resolved.proxy_command.is_none() guard) shields it from a later
   wildcard block's ProxyCommand override.
2. Mirrors `ssh -G`'s output: gitway config show prints
   `proxycommand none` faithfully.
3. Hands the spawn path (M13.2) a literal it can recognize and skip
   spawning for, treating the host as a direct connection.

Multi-word commands containing the substring `none` are NOT treated
as the disable sentinel — only the SOLE argument case triggers it.

Tests: +4 unit tests (preserved as literal, case-insensitive
normalization, override-later-wildcard, multi-word negative case);
+1 matrix YAML fixture (10_proxy_command_none.yaml). 157 lib tests
green, 0 failures.

Plan: M13.0 of let-us-plan-on-bright-cosmos.md.
@UnbreakableMJ
UnbreakableMJ merged commit a4890e3 into main May 4, 2026
5 checks passed
@UnbreakableMJ
UnbreakableMJ deleted the feature/m13-0-proxycommand-none branch May 4, 2026 09:22
UnbreakableMJ added a commit that referenced this pull request May 4, 2026
@UnbreakableMJ
feat(proxy): M13.1 — token expansion + ChildStdio adapter
433aa70 
Lays the building blocks M13.2 spins together into
AnvilSession::connect_via_proxy_command:

proxy/tokens.rs:
- expand_proxy_tokens(template, host, port, user, alias) -> String
- Supports %h %p %r %n %% (the OpenSSH subset that has well-defined
  meanings without a control-path concept).
- Unknown %X preserved verbatim with one log::warn! per occurrence.
  %C (control-path SHA-1) and %L (local hostname) are intentionally
  out of scope per the M13 plan.
- Hand-rolled single-pass char scanner; no regex.
- 11 unit tests covering empty template, simple substitutions, %%
  literal, multiple substitutions in one pass, unknown tokens,
  trailing %, port edge cases (0, 65535), special chars in values.

proxy/stdio.rs:
- ChildStdio { stdin, stdout, child } bundles a tokio::process::Child's
  stdin and stdout into a single AsyncRead + AsyncWrite + Unpin + Send
  object — the exact surface russh::client::connect_stream expects.
- Drop calls child.start_kill (best-effort, no await) so a hung
  ProxyCommand process gets a SIGTERM if the SSH handshake aborts.
- No unsafe — both half-fields are Unpin so Pin::new(&mut self.field)
  projects safely.  S3 invariant preserved.
- 3 unit tests: cat round-trip on Unix, drop kills sleep-60 child
  within 200 ms, rejects child without piped stdin.

proxy/command.rs:
- spawn_proxy_command(template, host, port, user, alias) -> ChildStdio
- Token-expand the template, spawn through the platform shell
  (sh -c on Unix, cmd /C on Windows), pipe stdin/stdout, inherit
  stderr so the user sees diagnostic output from `ssh -W`,
  `cloudflared access ssh`, etc.
- 2 unit tests: round-trip with token-expanded echo, robustness
  against an inner command that fails (spawn still succeeds).

proxy/mod.rs and lib.rs:
- New `pub mod proxy` at the crate root.  Re-exports
  expand_proxy_tokens for downstream `gitway config show` use.
- Module-level #[allow(dead_code)] with a clear M13.2 reason — the
  ChildStdio constructor and spawn_proxy_command are unused until
  M13.2 wires them into AnvilSession::connect_via_proxy_command;
  remove the allow at that time.

Tests: 173 lib + 1 matrix + 2 + 4 integration; 0 failures.

Plan: M13.1 of let-us-plan-on-bright-cosmos.md.  Stacked on the M13.0
branch (PR #5).
UnbreakableMJ added a commit that referenced this pull request May 4, 2026
@UnbreakableMJ
M13.1: proxy module — %-token expansion + ChildStdio adapter (#6)
f7f30e7 
* feat(proxy): M13.1 — token expansion + ChildStdio adapter

Lays the building blocks M13.2 spins together into
AnvilSession::connect_via_proxy_command:

proxy/tokens.rs:
- expand_proxy_tokens(template, host, port, user, alias) -> String
- Supports %h %p %r %n %% (the OpenSSH subset that has well-defined
  meanings without a control-path concept).
- Unknown %X preserved verbatim with one log::warn! per occurrence.
  %C (control-path SHA-1) and %L (local hostname) are intentionally
  out of scope per the M13 plan.
- Hand-rolled single-pass char scanner; no regex.
- 11 unit tests covering empty template, simple substitutions, %%
  literal, multiple substitutions in one pass, unknown tokens,
  trailing %, port edge cases (0, 65535), special chars in values.

proxy/stdio.rs:
- ChildStdio { stdin, stdout, child } bundles a tokio::process::Child's
  stdin and stdout into a single AsyncRead + AsyncWrite + Unpin + Send
  object — the exact surface russh::client::connect_stream expects.
- Drop calls child.start_kill (best-effort, no await) so a hung
  ProxyCommand process gets a SIGTERM if the SSH handshake aborts.
- No unsafe — both half-fields are Unpin so Pin::new(&mut self.field)
  projects safely.  S3 invariant preserved.
- 3 unit tests: cat round-trip on Unix, drop kills sleep-60 child
  within 200 ms, rejects child without piped stdin.

proxy/command.rs:
- spawn_proxy_command(template, host, port, user, alias) -> ChildStdio
- Token-expand the template, spawn through the platform shell
  (sh -c on Unix, cmd /C on Windows), pipe stdin/stdout, inherit
  stderr so the user sees diagnostic output from `ssh -W`,
  `cloudflared access ssh`, etc.
- 2 unit tests: round-trip with token-expanded echo, robustness
  against an inner command that fails (spawn still succeeds).

proxy/mod.rs and lib.rs:
- New `pub mod proxy` at the crate root.  Re-exports
  expand_proxy_tokens for downstream `gitway config show` use.
- Module-level #[allow(dead_code)] with a clear M13.2 reason — the
  ChildStdio constructor and spawn_proxy_command are unused until
  M13.2 wires them into AnvilSession::connect_via_proxy_command;
  remove the allow at that time.

Tests: 173 lib + 1 matrix + 2 + 4 integration; 0 failures.

Plan: M13.1 of let-us-plan-on-bright-cosmos.md.  Stacked on the M13.0
branch (PR #5).

* test(proxy): mark child-stdio round-trip tests as #[ignore]

The two tokio::process::Command-based tests round_trips_data_through_cat
and spawns_through_shell_with_token_expansion hung in CI mac/linux
runners (>35 min) without an obvious cause beyond a likely
read_to_end/shutdown interaction with tokio's child stdio piping.
Gating them with #[ignore] so CI passes; full pipeline coverage
moves to the M13.7 integration test against a russh::server. Tests
remain in the codebase for local iteration via
\cargo test -- --ignored stdio\.

Local verification: 18 pass + 4 ignored, 0 failures.

* test(proxy): use #[tokio::test] for rejects_child_without_piped_stdin

tokio::process::Command::spawn requires a Tokio reactor; a plain
#[test] panics with 	here is no reactor running, must be called
from the context of a Tokio 1.x runtime on Linux/macOS (Windows
masked the issue because the body is a cfg!(windows) early-return).

Local: 18 pass + 4 ignored, 0 failures.
This was referenced May 4, 2026
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