balls 0.5.13

Git-native task tracker for parallel agent workflows
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211

//! Unit tests for [`crate::speculate_run`] — the whole pass against fixture
//! repos with a stub gate, proving the chain rules the design states: strict
//! head-first order, stop on conflict/fail/spent, no-verdict (exit 75) records
//! nothing, sweep of the unsealed, and the no-leftover invariants.

use std::fs;
use std::os::unix::fs::PermissionsExt;
use std::path::{Path, PathBuf};
use std::process::Command;

use tempfile::TempDir;

use super::run;
use crate::speculate_queue::{enqueue, queue};

fn git(repo: &Path, args: &[&str]) -> String {
    let out = Command::new("git")
        .arg("-C")
        .arg(repo)
        .args(["-c", "user.name=t", "-c", "user.email=t@t"])
        .args(args)
        .output()
        .unwrap();
    assert!(out.status.success(), "git {args:?}: {}", String::from_utf8_lossy(&out.stderr));
    String::from_utf8_lossy(&out.stdout).trim().to_string()
}

/// A repo with two cleanly-stacking work branches and one that conflicts
/// with main; the gate is a stub outside the repo.
struct Fx {
    _tmp: TempDir,
    root: PathBuf,
    scratch: PathBuf,
    territory: PathBuf,
    gate: PathBuf,
    log: PathBuf,
}

fn fx(gate_exit: &str) -> Fx {
    let tmp = TempDir::new().unwrap();
    let root = tmp.path().join("repo");
    fs::create_dir_all(&root).unwrap();
    git(&root, &["init", "-q", "-b", "main"]);
    fs::write(root.join("shared"), "line\n").unwrap();
    git(&root, &["add", "-A"]);
    git(&root, &["commit", "-q", "-m", "base"]);
    let base = git(&root, &["rev-parse", "HEAD"]);
    for (branch, file) in [("work/a", "fa"), ("work/b", "fb")] {
        git(&root, &["checkout", "-q", "-b", branch, &base]);
        fs::write(root.join(file), branch).unwrap();
        git(&root, &["add", "-A"]);
        git(&root, &["commit", "-q", "-m", branch]);
    }
    git(&root, &["checkout", "-q", "-b", "work/hostile", &base]);
    fs::write(root.join("shared"), "hostile\n").unwrap();
    git(&root, &["add", "-A"]);
    git(&root, &["commit", "-q", "-m", "hostile"]);
    git(&root, &["checkout", "-q", "main"]);
    fs::write(root.join("shared"), "moved\n").unwrap();
    git(&root, &["add", "-A"]);
    git(&root, &["commit", "-q", "-m", "moved"]);
    let f = Fx {
        scratch: tmp.path().join("scratch"),
        territory: tmp.path().join("territory"),
        gate: tmp.path().join("gate.sh"),
        log: tmp.path().join("gate.log"),
        _tmp: tmp,
        root,
    };
    set_gate(&f, gate_exit);
    f
}

/// (Re)write the stub gate: log the build dir it ran in, then exit `code`.
fn set_gate(f: &Fx, code: &str) {
    fs::write(&f.gate, format!("#!/bin/sh\npwd >> {}\nexit {code}\n", f.log.display())).unwrap();
    fs::set_permissions(&f.gate, fs::Permissions::from_mode(0o755)).unwrap();
}

fn verdicts(f: &Fx) -> usize {
    fs::read_dir(f.territory.join("verdicts")).map_or(0, Iterator::count)
}

fn pass(f: &Fx, builds: usize) -> Vec<String> {
    run(
        &f.root,
        &f.scratch,
        &f.territory,
        "rustc test",
        "main",
        f.gate.to_str().unwrap(),
        builds,
    )
    .unwrap()
}

fn gate_runs(f: &Fx) -> usize {
    fs::read_to_string(&f.log).map_or(0, |s| s.lines().count())
}

#[test]
fn builds_head_first_then_hits_and_the_second_pass_spends_nothing() {
    let f = fx("0");
    enqueue(&f.root, "a", Some("2026-01-01T10:00:00Z")).unwrap();
    enqueue(&f.root, "b", Some("2026-01-01T11:00:00Z")).unwrap();
    let report = pass(&f, 10);
    assert_eq!(report.len(), 3, "{report:?}");
    assert!(report[0].starts_with("built a ") && report[0].ends_with(" pass"), "{report:?}");
    assert!(report[1].starts_with("built b "), "{report:?}");
    assert!(report[2].starts_with("adopted hostile "), "the stray tip is adopted: {report:?}");
    assert_eq!(gate_runs(&f), 2);
    let again = pass(&f, 10);
    assert!(again[0].starts_with("hit a ") && again[1].starts_with("hit b "), "{again:?}");
    assert_eq!(gate_runs(&f), 2, "hits spend no gates");
    let listing = git(&f.root, &["worktree", "list", "--porcelain"]);
    assert_eq!(listing.matches("worktree ").count(), 1, "no build worktrees survive");
}

#[test]
fn budget_defers_and_a_failing_gate_stops_the_chain() {
    let f = fx("1");
    enqueue(&f.root, "a", Some("2026-01-01T10:00:00Z")).unwrap();
    enqueue(&f.root, "b", Some("2026-01-01T11:00:00Z")).unwrap();
    let report = pass(&f, 0);
    assert_eq!(report[0], "deferred a (builds spent)", "builds=0 is plan-only: {report:?}");
    assert!(report[1].starts_with("adopted hostile "), "{report:?}");
    let report = pass(&f, 10);
    assert!(report[0].starts_with("built a ") && report[0].contains("FAIL"), "{report:?}");
    assert_eq!(report.len(), 1, "a failing prefix ends the pass, nothing left to adopt: {report:?}");
    let report = pass(&f, 10);
    assert!(report[0].starts_with("fail a "), "the recorded FAIL stops later passes too");
    assert_eq!(gate_runs(&f), 1, "the fail was built once, never again");
}

#[test]
fn a_tempfail_gate_records_nothing_and_the_next_pass_rebuilds() {
    let f = fx("75");
    enqueue(&f.root, "a", Some("2026-01-01T10:00:00Z")).unwrap();
    enqueue(&f.root, "b", Some("2026-01-01T11:00:00Z")).unwrap();
    let report = pass(&f, 10);
    assert!(report[0].starts_with("no verdict a "), "{report:?}");
    assert!(report[0].ends_with("(gate exit 75) — unbuilt, pass ends"), "{report:?}");
    assert!(report[1].starts_with("adopted hostile "), "nothing builds past the unbuilt: {report:?}");
    assert_eq!(report.len(), 2, "{report:?}");
    assert_eq!(gate_runs(&f), 1);
    assert_eq!(verdicts(&f), 0, "a no-verdict writes no verdict file");
    set_gate(&f, "0");
    let report = pass(&f, 10);
    assert!(report[0].starts_with("built a ") && report[0].ends_with(" pass"), "{report:?}");
    assert!(report[1].starts_with("built b "), "the chain resumes past the rebuilt head: {report:?}");
    assert_eq!(gate_runs(&f), 3, "the unbuilt head was rebuilt, not remembered");
    assert_eq!(verdicts(&f), 2);
}

#[test]
fn conflicts_stop_the_chain_and_the_unsealed_are_swept() {
    let f = fx("0");
    enqueue(&f.root, "hostile", Some("2026-01-01T10:00:00Z")).unwrap();
    enqueue(&f.root, "a", Some("2026-01-01T11:00:00Z")).unwrap();
    let report = pass(&f, 10);
    assert!(report[0].starts_with("conflict hostile"), "{report:?}");
    assert!(report[1].starts_with("adopted b "), "nothing BUILDS past a conflict: {report:?}");
    assert_eq!(report.len(), 2, "{report:?}");
    git(&f.root, &["branch", "-D", "work/hostile"]);
    let report = pass(&f, 10);
    assert_eq!(report[0], "swept hostile (unsealed)", "{report:?}");
    assert!(report[1].starts_with("built a "), "the queue heals past the swept: {report:?}");
    assert!(report[2].starts_with("built b "), "the adopted entry builds in turn: {report:?}");
    assert_eq!(queue(&f.root).unwrap().len(), 2, "the stale tag is gone");
}

#[test]
fn adoption_is_the_paved_path_and_is_idempotent() {
    let f = fx("0");
    let report = pass(&f, 10);
    assert_eq!(report.len(), 3, "every stray tip is adopted, none built yet: {report:?}");
    for (line, id) in report.iter().zip(["a", "b", "hostile"]) {
        let tip = git(&f.root, &["rev-parse", &format!("refs/heads/work/{id}")]);
        assert_eq!(line, &format!("adopted {id} {tip}"), "{report:?}");
    }
    assert_eq!(gate_runs(&f), 0, "a fresh seal must survive one full pass before it builds");
    let report = pass(&f, 10);
    assert!(report[0].starts_with("built a ") && report[1].starts_with("built b "), "{report:?}");
    assert!(report[2].starts_with("conflict hostile"), "{report:?}");
    assert_eq!(report.len(), 3, "standing seals are not re-adopted: {report:?}");
}

#[test]
fn a_moved_tip_requeues_at_the_bottom_via_sweep_plus_adopt() {
    let f = fx("0");
    enqueue(&f.root, "a", Some("2026-01-01T10:00:00Z")).unwrap();
    enqueue(&f.root, "b", Some("2026-01-01T11:00:00Z")).unwrap();
    git(&f.root, &["checkout", "-q", "work/a"]);
    fs::write(f.root.join("fa"), "moved").unwrap();
    git(&f.root, &["add", "-A"]);
    git(&f.root, &["commit", "-q", "-m", "moved"]);
    git(&f.root, &["checkout", "-q", "main"]);
    let report = pass(&f, 10);
    assert_eq!(report[0], "swept a (unsealed)", "{report:?}");
    assert!(report[1].starts_with("built b "), "{report:?}");
    assert!(report[2].starts_with("adopted a "), "the moved tip re-seals at the bottom: {report:?}");
    let report = pass(&f, 10);
    assert!(report[0].starts_with("hit b ") && report[1].starts_with("built a "), "{report:?}");
}

#[test]
fn a_missing_landing_branch_is_loud() {
    let f = fx("0");
    let err = run(&f.root, &f.scratch, &f.territory, "rustc test", "ghost", "true", 1).unwrap_err();
    assert!(err.to_string().contains("rev-parse ghost"), "{err}");
}