bpt 0.1.6

Bedrock Linux package manager
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

use crate::{
    error::*, io::reject_unsafe_path, make_display_color, make_field, marshalling::*, metadata::*,
};
use std::borrow::Cow;

/// List of user-customizable files which should be retained during upgrade or removal of a
/// package if they have been modified.
#[derive(Clone, Debug)]
pub struct Backup(Vec<Filepath>);

make_field!(Backup, PkgKey);

impl Backup {
    #[cfg(test)]
    pub fn new() -> Self {
        Self(Vec::new())
    }

    pub fn as_slice(&self) -> &[Filepath] {
        &self.0
    }

    pub fn iter(&self) -> std::slice::Iter<'_, Filepath> {
        self.0.iter()
    }
}

impl std::fmt::Display for Backup {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let mut first = true;
        for entry in &self.0 {
            if first {
                first = false;
            } else {
                write!(f, " ")?;
            }
            write!(f, "{}", entry)?;
        }
        Ok(())
    }
}

make_display_color!(Backup, |s, f| {
    let mut first = true;
    for entry in &s.0 {
        if first {
            first = false;
        } else {
            write!(f, " ")?;
        }
        write!(f, "{}", entry.color())?;
    }
    Ok(())
});

impl FromFieldStr for Backup {
    fn from_field_str(value: FieldStr) -> Result<Self, AnonLocErr> {
        let mut entries = Vec::new();
        for entry in value.split_whitespace() {
            reject_unsafe_path(entry.as_str(), Self::NAME)?;
            entries.push(Filepath::from_field_str(entry)?);
        }
        Ok(Self(entries))
    }
}

impl AsBytes for Backup {
    fn as_bytes(&self) -> Cow<'_, [u8]> {
        match self.as_slice() {
            [] => Cow::Borrowed(b""),
            [single] => single.as_bytes(),
            [first, rest @ ..] => {
                let mut bytes = Vec::from(first.as_bytes().as_ref());
                for entry in rest {
                    bytes.push(b' ');
                    bytes.extend_from_slice(entry.as_bytes().as_ref());
                }
                Cow::Owned(bytes)
            }
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn parse(s: &str) -> Result<Backup, AnonLocErr> {
        FieldStr::try_from(s)
            .map_err(|e| e.field(Backup::NAME))
            .and_then(Backup::from_field_str)
    }

    #[test]
    fn roundtrip() {
        let backup = parse("etc/fakeblock.conf var/lib/fakeblock/state").unwrap();
        assert_eq!(
            std::str::from_utf8(&backup.as_bytes()).unwrap(),
            "etc/fakeblock.conf var/lib/fakeblock/state"
        );
    }

    #[test]
    fn empty_is_empty_list() {
        let backup = parse("").unwrap();
        assert!(backup.as_slice().is_empty());
    }

    #[test]
    fn absolute_path_rejected() {
        for path in &[
            "/etc/fakeblock.conf",
            "etc/fakeblock.conf /var/lib/fakeblock/state",
        ] {
            let err = parse(path).unwrap_err();
            let msg = format!("{err:?}");
            assert!(
                msg.contains("absolute"),
                "expected absolute path error for `{path}`, got: {msg}"
            );
        }
    }

    #[test]
    fn dotdot_rejected() {
        for path in &["../etc/fakeblock.conf", "etc/../fakeblock.conf"] {
            let err = parse(path).unwrap_err();
            let msg = format!("{err:?}");
            assert!(
                msg.contains(".."),
                "expected `..` path error for `{path}`, got: {msg}"
            );
        }
    }
}