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
|
package nix2
import (
"bytes"
"encoding/json"
"fmt"
"os"
"os/exec"
"path/filepath"
"github.com/hashicorp/nomad/helper/pluginutils/hclutils"
)
const (
closureNix = `
{ path }:
let
nixpkgs = builtins.getFlake "%s";
inherit (nixpkgs.legacyPackages.x86_64-linux) buildPackages;
in buildPackages.closureInfo { rootPaths = builtins.storePath path; }
`
)
func prepareNixPackages(taskDir string, packages []string, nixpkgs string) (hclutils.MapStrStr, error) {
mounts := make(hclutils.MapStrStr)
profileLink := filepath.Join(taskDir, "current-profile")
profile, err := nixBuildProfile(packages, profileLink)
if err != nil {
return nil, fmt.Errorf("Build of the flakes failed: %v", err)
}
closureLink := filepath.Join(taskDir, "current-closure")
closure, err := nixBuildClosure(profileLink, closureLink, nixpkgs)
if err != nil {
return nil, fmt.Errorf("Build of the flakes failed: %v", err)
}
mounts[profile] = profile
if entries, err := os.ReadDir(profile); err != nil {
return nil, fmt.Errorf("Couldn't read profile directory: %w", err)
} else {
for _, entry := range entries {
if name := entry.Name(); name != "etc" {
mounts[filepath.Join(profile, name)] = "/" + name
continue
}
etcEntries, err := os.ReadDir(filepath.Join(profile, "etc"))
if err != nil {
return nil, fmt.Errorf("Couldn't read profile's /etc directory: %w", err)
}
for _, etcEntry := range etcEntries {
etcName := etcEntry.Name()
mounts[filepath.Join(profile, "etc", etcName)] = "/etc/" + etcName
}
}
}
requisites, err := nixRequisites(closure)
if err != nil {
return nil, fmt.Errorf("Couldn't determine flake requisites: %v", err)
}
for _, requisite := range requisites {
mounts[requisite] = requisite
}
return mounts, nil
}
func nixBuildProfile(flakes []string, link string) (string, error) {
cmd := exec.Command("nix", append(
[]string{
"--extra-experimental-features", "nix-command",
"--extra-experimental-features", "flakes",
"profile",
"install",
"--no-write-lock-file",
"--profile",
link},
flakes...)...)
stderr := &bytes.Buffer{}
cmd.Stderr = stderr
if err := cmd.Run(); err != nil {
return "", fmt.Errorf("%v failed: %s. Err: %v", cmd.Args, stderr.String(), err)
}
if target, err := os.Readlink(link); err == nil {
return os.Readlink(filepath.Join(filepath.Dir(link), target))
} else {
return "", err
}
}
func nixBuildClosure(profile string, link string, nixpkgs string) (string, error) {
cmd := exec.Command(
"nix",
"--extra-experimental-features", "nix-command",
"--extra-experimental-features", "flakes",
"build",
"--out-link", link,
"--expr", fmt.Sprintf(closureNix, nixpkgs),
"--impure",
"--no-write-lock-file",
"--argstr", "path", profile)
stderr := &bytes.Buffer{}
cmd.Stderr = stderr
if err := cmd.Run(); err != nil {
return "", fmt.Errorf("%v failed: %s. Err: %v", cmd.Args, stderr.String(), err)
}
return os.Readlink(link)
}
type nixPathInfo struct {
Path string `json:"path"`
NarHash string `json:"narHash"`
NarSize uint64 `json:"narSize"`
References []string `json:"references"`
Deriver string `json:"deriver"`
RegistrationTime uint64 `json:"registrationTime"`
Signatures []string `json:"signatures"`
}
func nixRequisites(path string) ([]string, error) {
cmd := exec.Command(
"nix",
"--extra-experimental-features", "nix-command",
"--extra-experimental-features", "flakes",
"path-info",
"--json",
"--recursive",
path)
stdout := &bytes.Buffer{}
cmd.Stdout = stdout
stderr := &bytes.Buffer{}
cmd.Stderr = stderr
if err := cmd.Run(); err != nil {
return nil, fmt.Errorf("%v failed: %s. Err: %v", cmd.Args, stderr.String(), err)
}
result := []*nixPathInfo{}
if err := json.Unmarshal(stdout.Bytes(), &result); err != nil {
return nil, err
}
requisites := []string{}
for _, result := range result {
requisites = append(requisites, result.Path)
}
return requisites, nil
}
|
