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
|
#pragma once
#include "types.hh"
#include "hash.hh"
#include "path.hh"
#include "attrs.hh"
#include "url.hh"
#include <memory>
namespace nix { class Store; }
namespace nix::fetchers {
struct Tree
{
Path actualPath;
StorePath storePath;
Tree(Path && actualPath, StorePath && storePath) : actualPath(actualPath), storePath(std::move(storePath)) {}
};
struct InputScheme;
// The Input object is generated by a specific fetcher, based on the
// user-supplied input attribute in the flake.nix file, and contains
// the information that the specific fetcher needs to perform the
// actual fetch. The Input object is most commonly created via the
// "fromURL()" or "fromAttrs()" static functions which are provided the
// url or attrset specified in the flake file.
struct Input
{
friend struct InputScheme;
std::shared_ptr<InputScheme> scheme; // note: can be null
Attrs attrs;
bool immutable = false;
bool direct = true;
public:
static Input fromURL(const std::string & url);
static Input fromURL(const ParsedURL & url);
static Input fromAttrs(Attrs && attrs);
ParsedURL toURL() const;
std::string to_string() const;
Attrs toAttrs() const;
/* Check whether this is a "direct" input, that is, not
one that goes through a registry. */
bool isDirect() const { return direct; }
/* Check whether this is an "immutable" input, that is,
one that contains a commit hash or content hash. */
bool isImmutable() const { return immutable; }
bool hasAllInfo() const;
bool operator ==(const Input & other) const;
bool contains(const Input & other) const;
std::pair<Tree, Input> fetch(ref<Store> store) const;
Input applyOverrides(
std::optional<std::string> ref,
std::optional<Hash> rev) const;
void clone(const Path & destDir) const;
std::optional<Path> getSourcePath() const;
void markChangedFile(
std::string_view file,
std::optional<std::string> commitMsg) const;
StorePath computeStorePath(Store & store) const;
// Convience functions for common attributes.
std::string getType() const;
std::optional<Hash> getNarHash() const;
std::optional<std::string> getRef() const;
std::optional<Hash> getRev() const;
std::optional<uint64_t> getRevCount() const;
std::optional<time_t> getLastModified() const;
};
// The InputScheme represents a type of fetcher. Each fetcher
// registers with nix at startup time. When processing an input for a
// flake, each scheme is given an opportunity to "recognize" that
// input from the url or attributes in the flake file's specification
// and return an Input object to represent the input if it is
// recognized. The Input object contains the information the fetcher
// needs to actually perform the "fetch()" when called.
struct InputScheme
{
virtual std::optional<Input> inputFromURL(const ParsedURL & url) = 0;
virtual std::optional<Input> inputFromAttrs(const Attrs & attrs) = 0;
virtual ParsedURL toURL(const Input & input);
virtual bool hasAllInfo(const Input & input) = 0;
virtual Input applyOverrides(
const Input & input,
std::optional<std::string> ref,
std::optional<Hash> rev);
virtual void clone(const Input & input, const Path & destDir);
virtual std::optional<Path> getSourcePath(const Input & input);
virtual void markChangedFile(const Input & input, std::string_view file, std::optional<std::string> commitMsg);
virtual std::pair<Tree, Input> fetch(ref<Store> store, const Input & input) = 0;
};
void registerInputScheme(std::shared_ptr<InputScheme> && fetcher);
struct DownloadFileResult
{
StorePath storePath;
std::string etag;
std::string effectiveUrl;
};
DownloadFileResult downloadFile(
ref<Store> store,
const std::string & url,
const std::string & name,
bool immutable);
std::pair<Tree, time_t> downloadTarball(
ref<Store> store,
const std::string & url,
const std::string & name,
bool immutable);
}
|
