timefs 0.1.0

Mount a Git repository as a read-only filesystem.
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

mod support;

use self::support::{
    assert_revision_tree_matches_git, make_executable, with_mounted_timefs, write_symlink,
    RepositoryFixture,
};
use std::fs;

#[test]
fn differential_revision_matrix_matches_git() {
    let fixture = differential_fixture();
    let parent_sha = fixture.git_rev_parse("HEAD~1");
    let parent_short = fixture.git_rev_parse_short("HEAD~1");

    let (_value, mount) = with_mounted_timefs(fixture.path(), &[], &["-f"], |mounted| {
        let cases = vec![
            (mounted.path().join("now"), "HEAD"),
            (mounted.path().join("at").join("HEAD"), "HEAD"),
            (mounted.path().join("at").join("HEAD~1"), "HEAD~1"),
            (mounted.path().join("at").join("topic"), "topic"),
            (mounted.path().join("at").join("v1.0"), "v1.0"),
            (
                mounted.path().join("at").join(parent_sha.as_str()),
                "HEAD~1",
            ),
            (
                mounted.path().join("commits").join(parent_short.as_str()),
                "HEAD~1",
            ),
            (
                mounted
                    .path()
                    .join("refs")
                    .join("heads")
                    .join("feature")
                    .join("x"),
                "feature/x",
            ),
        ];

        for (mount_root, rev) in cases {
            assert_revision_tree_matches_git(&fixture, &mount_root, rev);
        }

        assert_eq!(
            fs::read(mounted.path().join("now").join("README.md"))
                .expect("HEAD README should be readable"),
            fixture.git_show_path("HEAD", b"README.md")
        );
        assert_eq!(
            fs::read(mounted.path().join("at").join("HEAD~1").join("topic.txt"),)
                .expect("HEAD~1 topic marker should be readable"),
            fixture.git_show_path("HEAD~1", b"topic.txt")
        );
        assert_eq!(
            fs::read_link(
                mounted
                    .path()
                    .join("at")
                    .join("v1.0")
                    .join("link-to-script")
            )
            .expect("tagged symlink should resolve")
            .as_os_str()
            .as_encoded_bytes(),
            fixture.git_show_path("v1.0", b"link-to-script")
        );
        assert_eq!(
            fs::read(
                mounted
                    .path()
                    .join("refs")
                    .join("heads")
                    .join("feature")
                    .join("x")
                    .join("topic.txt"),
            )
            .expect("feature/x topic marker should be readable"),
            fixture.git_show_path("feature/x", b"topic.txt")
        );
    });

    assert!(
        mount.stderr.is_empty(),
        "differential mount emitted unexpected stderr: {}",
        mount.stderr
    );
}

fn differential_fixture() -> RepositoryFixture {
    let fixture = RepositoryFixture::new("timefs-task8-differential");
    fs::create_dir_all(fixture.path().join("nested"))
        .expect("fixture directory creation should succeed");

    fs::write(
        fixture.path().join("README.md"),
        b"timefs differential fixture\n",
    )
    .expect("README write should succeed");
    fs::write(
        fixture.path().join("nested/data.bin"),
        [0_u8, 1, 2, 3, 0, 255],
    )
    .expect("binary write should succeed");
    fs::write(
        fixture.path().join("run.sh"),
        b"#!/bin/sh\necho differential\n",
    )
    .expect("script write should succeed");
    make_executable(&fixture.path().join("run.sh"));
    write_symlink("run.sh", &fixture.path().join("link-to-script"));

    fixture.git(["add", "."]);
    fixture.git(["commit", "-m", "Create differential fixture"]);
    fixture.git(["tag", "v1.0"]);

    fs::write(
        fixture.path().join("README.md"),
        b"timefs differential fixture v2\n",
    )
    .expect("updated README write should succeed");
    fs::write(fixture.path().join("topic.txt"), b"branch point data\n")
        .expect("topic marker write should succeed");
    fixture.git(["add", "."]);
    fixture.git(["commit", "-m", "Prepare differential matrix"]);
    fixture.git(["branch", "topic"]);
    fixture.git(["branch", "feature/x"]);

    fs::write(fixture.path().join("head-only.txt"), b"current HEAD\n")
        .expect("head marker write should succeed");
    fixture.git(["add", "."]);
    fixture.git(["commit", "-m", "Advance HEAD"]);

    fixture
}