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
|
//! Module to create an OCI runtime bundle for a given [BuildRequest].
use std::{
fs,
path::{Path, PathBuf},
};
use super::scratch_name;
use crate::buildservice::BuildRequest;
use anyhow::{bail, Context};
use tracing::{debug, instrument};
/// Produce an OCI bundle in a given path.
/// Check [make_spec] for a description about the paths produced.
#[instrument(err)]
pub(crate) fn make_bundle<'a>(
request: &BuildRequest,
runtime_spec: &oci_spec::runtime::Spec,
path: &Path,
) -> anyhow::Result<()> {
fs::create_dir_all(path).context("failed to create bundle path")?;
let spec_json = serde_json::to_string(runtime_spec).context("failed to render spec to json")?;
fs::write(path.join("config.json"), spec_json).context("failed to write config.json")?;
fs::create_dir_all(path.join("inputs")).context("failed to create inputs dir")?;
let root_path = path.join("root");
fs::create_dir_all(&root_path).context("failed to create root path dir")?;
fs::create_dir_all(root_path.join("etc")).context("failed to create root/etc dir")?;
// TODO: populate /etc/{group,passwd}. It's a mess?
let scratch_root = path.join("scratch");
fs::create_dir_all(&scratch_root).context("failed to create scratch/ dir")?;
// for each scratch path, calculate its name inside scratch, and ensure the
// directory exists.
for p in request.scratch_paths.iter() {
let scratch_path = scratch_root.join(scratch_name(p));
debug!(scratch_path=?scratch_path, path=?p, "about to create scratch dir");
fs::create_dir_all(scratch_path).context("Unable to create scratch dir")?;
}
Ok(())
}
/// Determine the path of all outputs specified in a [BuildRequest]
/// as seen from the host, for post-build ingestion.
/// This lookup needs to take scratch paths into consideration, as the build
/// root is not writable on its own.
/// If a path can't be determined, an error is returned.
pub(crate) fn get_host_output_paths(
request: &BuildRequest,
bundle_path: &Path,
) -> anyhow::Result<Vec<PathBuf>> {
let scratch_root = bundle_path.join("scratch");
let mut host_output_paths: Vec<PathBuf> = Vec::with_capacity(request.outputs.len());
for output_path in request.outputs.iter() {
// calculate the location of the path.
if let Some((mp, relpath)) = find_path_in_scratchs(output_path, &request.scratch_paths) {
host_output_paths.push(scratch_root.join(scratch_name(mp)).join(relpath));
} else {
bail!("unable to find path {output_path:?}");
}
}
Ok(host_output_paths)
}
/// For a given list of mountpoints (sorted) and a search_path, find the
/// specific mountpoint parenting that search_path and return it, as well as the
/// relative path from there to the search_path.
/// mountpoints must be sorted, so we can iterate over the list from the back
/// and match on the prefix.
fn find_path_in_scratchs<'a, 'b, I>(
search_path: &'a Path,
mountpoints: I,
) -> Option<(&'b Path, &'a Path)>
where
I: IntoIterator<Item = &'b PathBuf>,
I::IntoIter: DoubleEndedIterator,
{
mountpoints
.into_iter()
.rev()
.find_map(|mp| Some((mp.as_path(), search_path.strip_prefix(mp).ok()?)))
}
#[cfg(test)]
mod tests {
use std::path::{Path, PathBuf};
use rstest::rstest;
use crate::{buildservice::BuildRequest, oci::scratch_name};
use super::{find_path_in_scratchs, get_host_output_paths};
#[rstest]
#[case::simple("nix/store/aaaa", &["nix/store".into()], Some(("nix/store", "aaaa")))]
#[case::prefix_no_sep("nix/store/aaaa", &["nix/sto".into()], None)]
#[case::not_found("nix/store/aaaa", &["build".into()], None)]
fn test_test_find_path_in_scratchs(
#[case] search_path: &str,
#[case] mountpoints: &[String],
#[case] expected: Option<(&str, &str)>,
) {
let expected = expected.map(|e| (Path::new(e.0), Path::new(e.1)));
assert_eq!(
find_path_in_scratchs(
Path::new(search_path),
mountpoints
.iter()
.map(PathBuf::from)
.collect::<Vec<_>>()
.as_slice()
),
expected
);
}
#[test]
fn test_get_host_output_paths_simple() {
let request = BuildRequest {
outputs: vec!["nix/store/fhaj6gmwns62s6ypkcldbaj2ybvkhx3p-foo".into()],
scratch_paths: vec!["build".into(), "nix/store".into()],
..Default::default()
};
let paths =
get_host_output_paths(&request, Path::new("bundle-root")).expect("must succeed");
let mut expected_path = PathBuf::new();
expected_path.push("bundle-root");
expected_path.push("scratch");
expected_path.push(scratch_name(Path::new("nix/store")));
expected_path.push("fhaj6gmwns62s6ypkcldbaj2ybvkhx3p-foo");
assert_eq!(vec![expected_path], paths)
}
}
|
