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

use crate::core::{Dependency, Package, PackageId, SourceId, Summary};
use crate::sources::source::MaybePackage;
use crate::sources::source::QueryKind;
use crate::sources::source::Source;
use crate::util::errors::CargoResult;
use std::task::Poll;

use anyhow::Context as _;

/// A source that replaces one source with the other. This manages the [source
/// replacement] feature.
///
/// The implementation is merely redirecting from the original to the replacement.
///
/// [source replacement]: https://doc.rust-lang.org/nightly/cargo/reference/source-replacement.html
pub struct ReplacedSource<'cfg> {
    /// The identifier of the original source.
    to_replace: SourceId,
    /// The identifier of the new replacement source.
    replace_with: SourceId,
    inner: Box<dyn Source + 'cfg>,
}

impl<'cfg> ReplacedSource<'cfg> {
    /// Creates a replaced source.
    ///
    /// The `src` argument is the new replacement source.
    pub fn new(
        to_replace: SourceId,
        replace_with: SourceId,
        src: Box<dyn Source + 'cfg>,
    ) -> ReplacedSource<'cfg> {
        ReplacedSource {
            to_replace,
            replace_with,
            inner: src,
        }
    }
}

impl<'cfg> Source for ReplacedSource<'cfg> {
    fn source_id(&self) -> SourceId {
        self.to_replace
    }

    fn replaced_source_id(&self) -> SourceId {
        self.replace_with
    }

    fn supports_checksums(&self) -> bool {
        self.inner.supports_checksums()
    }

    fn requires_precise(&self) -> bool {
        self.inner.requires_precise()
    }

    fn query(
        &mut self,
        dep: &Dependency,
        kind: QueryKind,
        f: &mut dyn FnMut(Summary),
    ) -> Poll<CargoResult<()>> {
        let (replace_with, to_replace) = (self.replace_with, self.to_replace);
        let dep = dep.clone().map_source(to_replace, replace_with);

        self.inner
            .query(&dep, kind, &mut |summary| {
                f(summary.map_source(replace_with, to_replace))
            })
            .map_err(|e| {
                e.context(format!(
                    "failed to query replaced source {}",
                    self.to_replace
                ))
            })
    }

    fn invalidate_cache(&mut self) {
        self.inner.invalidate_cache()
    }

    fn set_quiet(&mut self, quiet: bool) {
        self.inner.set_quiet(quiet);
    }

    fn download(&mut self, id: PackageId) -> CargoResult<MaybePackage> {
        let id = id.with_source_id(self.replace_with);
        let pkg = self
            .inner
            .download(id)
            .with_context(|| format!("failed to download replaced source {}", self.to_replace))?;
        Ok(match pkg {
            MaybePackage::Ready(pkg) => {
                MaybePackage::Ready(pkg.map_source(self.replace_with, self.to_replace))
            }
            other @ MaybePackage::Download { .. } => other,
        })
    }

    fn finish_download(&mut self, id: PackageId, data: Vec<u8>) -> CargoResult<Package> {
        let id = id.with_source_id(self.replace_with);
        let pkg = self
            .inner
            .finish_download(id, data)
            .with_context(|| format!("failed to download replaced source {}", self.to_replace))?;
        Ok(pkg.map_source(self.replace_with, self.to_replace))
    }

    fn fingerprint(&self, id: &Package) -> CargoResult<String> {
        self.inner.fingerprint(id)
    }

    fn verify(&self, id: PackageId) -> CargoResult<()> {
        let id = id.with_source_id(self.replace_with);
        self.inner.verify(id)
    }

    fn describe(&self) -> String {
        if self.replace_with.is_crates_io() && self.to_replace.is_crates_io() {
            // Built-in source replacement of crates.io for sparse registry or tests
            // doesn't need duplicate description (crates.io replacing crates.io).
            self.inner.describe()
        } else {
            format!(
                "{} (which is replacing {})",
                self.inner.describe(),
                self.to_replace
            )
        }
    }

    fn is_replaced(&self) -> bool {
        true
    }

    fn add_to_yanked_whitelist(&mut self, pkgs: &[PackageId]) {
        let pkgs = pkgs
            .iter()
            .map(|id| id.with_source_id(self.replace_with))
            .collect::<Vec<_>>();
        self.inner.add_to_yanked_whitelist(&pkgs);
    }

    fn is_yanked(&mut self, pkg: PackageId) -> Poll<CargoResult<bool>> {
        self.inner.is_yanked(pkg)
    }

    fn block_until_ready(&mut self) -> CargoResult<()> {
        self.inner
            .block_until_ready()
            .with_context(|| format!("failed to update replaced source {}", self.to_replace))
    }
}