├── .gitignore
├── Cargo.lock
├── Cargo.toml
├── LICENSE-APACHE
├── LICENSE-MIT
├── README.md
├── cloud-seed.service
└── src
    ├── execute.rs
    ├── main.rs
    ├── schema.rs
    ├── source.rs
    └── source
        ├── alibaba.rs
        ├── amazon.rs
        ├── exoscale.rs
        ├── google.rs
        ├── helpers.rs
        ├── openstack.rs
        ├── oracle.rs
        └── vultr.rs


/.gitignore:
--------------------------------------------------------------------------------
1 | /target
2 | 


--------------------------------------------------------------------------------
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1596 |  "windows_aarch64_msvc 0.48.0",
1597 |  "windows_i686_gnu 0.48.0",
1598 |  "windows_i686_msvc 0.48.0",
1599 |  "windows_x86_64_gnu 0.48.0",
1600 |  "windows_x86_64_gnullvm 0.48.0",
1601 |  "windows_x86_64_msvc 0.48.0",
1602 | ]
1603 | 
1604 | [[package]]
1605 | name = "windows_aarch64_gnullvm"
1606 | version = "0.42.2"
1607 | source = "registry+https://github.com/rust-lang/crates.io-index"
1608 | checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
1609 | 
1610 | [[package]]
1611 | name = "windows_aarch64_gnullvm"
1612 | version = "0.48.0"
1613 | source = "registry+https://github.com/rust-lang/crates.io-index"
1614 | checksum = "91ae572e1b79dba883e0d315474df7305d12f569b400fcf90581b06062f7e1bc"
1615 | 
1616 | [[package]]
1617 | name = "windows_aarch64_msvc"
1618 | version = "0.42.2"
1619 | source = "registry+https://github.com/rust-lang/crates.io-index"
1620 | checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
1621 | 
1622 | [[package]]
1623 | name = "windows_aarch64_msvc"
1624 | version = "0.48.0"
1625 | source = "registry+https://github.com/rust-lang/crates.io-index"
1626 | checksum = "b2ef27e0d7bdfcfc7b868b317c1d32c641a6fe4629c171b8928c7b08d98d7cf3"
1627 | 
1628 | [[package]]
1629 | name = "windows_i686_gnu"
1630 | version = "0.42.2"
1631 | source = "registry+https://github.com/rust-lang/crates.io-index"
1632 | checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
1633 | 
1634 | [[package]]
1635 | name = "windows_i686_gnu"
1636 | version = "0.48.0"
1637 | source = "registry+https://github.com/rust-lang/crates.io-index"
1638 | checksum = "622a1962a7db830d6fd0a69683c80a18fda201879f0f447f065a3b7467daa241"
1639 | 
1640 | [[package]]
1641 | name = "windows_i686_msvc"
1642 | version = "0.42.2"
1643 | source = "registry+https://github.com/rust-lang/crates.io-index"
1644 | checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
1645 | 
1646 | [[package]]
1647 | name = "windows_i686_msvc"
1648 | version = "0.48.0"
1649 | source = "registry+https://github.com/rust-lang/crates.io-index"
1650 | checksum = "4542c6e364ce21bf45d69fdd2a8e455fa38d316158cfd43b3ac1c5b1b19f8e00"
1651 | 
1652 | [[package]]
1653 | name = "windows_x86_64_gnu"
1654 | version = "0.42.2"
1655 | source = "registry+https://github.com/rust-lang/crates.io-index"
1656 | checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
1657 | 
1658 | [[package]]
1659 | name = "windows_x86_64_gnu"
1660 | version = "0.48.0"
1661 | source = "registry+https://github.com/rust-lang/crates.io-index"
1662 | checksum = "ca2b8a661f7628cbd23440e50b05d705db3686f894fc9580820623656af974b1"
1663 | 
1664 | [[package]]
1665 | name = "windows_x86_64_gnullvm"
1666 | version = "0.42.2"
1667 | source = "registry+https://github.com/rust-lang/crates.io-index"
1668 | checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
1669 | 
1670 | [[package]]
1671 | name = "windows_x86_64_gnullvm"
1672 | version = "0.48.0"
1673 | source = "registry+https://github.com/rust-lang/crates.io-index"
1674 | checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
1675 | 
1676 | [[package]]
1677 | name = "windows_x86_64_msvc"
1678 | version = "0.42.2"
1679 | source = "registry+https://github.com/rust-lang/crates.io-index"
1680 | checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
1681 | 
1682 | [[package]]
1683 | name = "windows_x86_64_msvc"
1684 | version = "0.48.0"
1685 | source = "registry+https://github.com/rust-lang/crates.io-index"
1686 | checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
1687 | 
1688 | [[package]]
1689 | name = "xmlparser"
1690 | version = "0.13.5"
1691 | source = "registry+https://github.com/rust-lang/crates.io-index"
1692 | checksum = "4d25c75bf9ea12c4040a97f829154768bbbce366287e2dc044af160cd79a13fd"
1693 | 
1694 | [[package]]
1695 | name = "zeroize"
1696 | version = "1.6.0"
1697 | source = "registry+https://github.com/rust-lang/crates.io-index"
1698 | checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
1699 | 


--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "cloud-seed"
 3 | version = "0.1.0"
 4 | authors = ["Jasper Hugo <jasper@jasperhugo.com>"]
 5 | edition = "2021"
 6 | description = "Fetch user-data from a cloud provider and write files described within to the filesystem"
 7 | repository = "https://github.com/jbg/cloud-seed"
 8 | license = "MIT OR Apache-2.0"
 9 | 
10 | [dependencies]
11 | anyhow = { version = "1", default-features = false, features = ["std"] }
12 | async-compression = { version = "0.3", default-features = false, features = ["tokio", "gzip"]}
13 | async-trait = { version = "0.1", default-features = false }
14 | aws-config = { optional = true, version = "0.55", default-features = false, features = ["client-hyper", "rustls", "rt-tokio"] }
15 | base64 = { version = "0.21", default-features = false, features = ["std"] }
16 | flate2 = { optional = true, version = "1", default-features = false, features = ["rust_backend"] }
17 | futures-util = { version = "0.3", default-features = false, features = ["std"] }
18 | hostname = { version = "0.3", default-features = false, features = ["set"] }
19 | hyper = { optional = true, version = "0.14", default-features = false, features = ["client", "http1", "tcp", "stream"] }
20 | nix = { version = "0.26", default-features = false, features = ["fs", "user"] }
21 | once_cell = { version = "1", default-features = false, features = ["std"] }
22 | serde = { version = "1", default-features = false, features = ["derive", "std"] }
23 | serde_json = { version = "1", default-features = false, features = ["std"] }
24 | serde_yaml = { version = "0.9", default-features = false }
25 | tokio = { version = "1", default-features = false, features = ["fs", "io-util", "macros", "rt-multi-thread"] }
26 | tokio-util = { version = "0.7", default-features = false, features = ["io"] }
27 | tracing = { version = "0.1", default-features = false, features = ["std", "attributes"] }
28 | tracing-subscriber = { version = "0.3", default-features = false, features = ["std", "env-filter", "fmt", "ansi", "registry", "smallvec", "tracing-log"] }
29 | 
30 | [features]
31 | default = [
32 |   "source-alibaba",
33 |   "source-amazon",
34 |   "source-exoscale",
35 |   "source-google",
36 |   "source-openstack",
37 |   "source-oracle",
38 |   "source-vultr",
39 | ]
40 | helper-http = ["hyper", "flate2"]
41 | source-alibaba = ["helper-http"]
42 | source-amazon = ["aws-config"]
43 | source-exoscale = ["helper-http"]
44 | source-google = ["helper-http"]
45 | source-openstack = ["helper-http"]
46 | source-oracle = ["helper-http"]
47 | source-vultr = ["helper-http"]
48 | 


--------------------------------------------------------------------------------
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23 | DEALINGS IN THE SOFTWARE.


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # cloud-seed
 2 | 
 3 | ![crates.io](https://img.shields.io/crates/v/cloud-seed.svg)
 4 | 
 5 | **cloud-seed** is a very minimal alternative to cloud-init. It can set the hostname and write files based on directives provided in user data.
 6 | 
 7 | ## Motivation
 8 | 
 9 | Launching a server should be deterministic: launching the same image with the same configuration should have the same result. To that end, server images should include all software and base configuration required for the function of the server.
10 | 
11 | Installing software and performing configuration via scripts on startup introduces opportunities for failure or non-determinism. To update software or fundamentally change the configuration of the server, a new image should be built. The image build process should be automated and frictionless to allow for rapid deployment when necessary.
12 | 
13 | cloud-seed exists because it is often necessary to provide some "seed" data to an otherwise-ready-to-run image: some values should not be baked into the image due to them varying from server to server.
14 | 
15 | Existing solutions like cloud-init go far beyond this basic requirement, with the ability to install packages, run scripts, modify network configuration, modify partitioning and more. All of these goals can be achieved in a safer and more repeatable way either during the image build process or through appropriate configuration contained within the image, in combination with values provided via cloud-seed where necessary.
16 | 
17 | ## Building from source
18 | 
19 | ```
20 | cargo build --release
21 | cp target/release/cloud-seed $IMAGE_ROOT/usr/bin/
22 | cp cloud-seed.service $IMAGE_ROOT/usr/lib/systemd/system/
23 | ```
24 | 
25 | Pull requests to add packaging scripts are welcomed.
26 | 
27 | ## User data format
28 | 
29 | The user data consists of `#cloud-seed` followed by a newline and then a JSON object. The entire user data including the `#cloud-seed` header can optionally be compressed with gzip, which is automatically detected.
30 | 
31 | Two keys are currently defined for the JSON object: `files`, which is an array of file objects, and `hostname`, which is a string. Both are optional. All other keys are ignored.
32 | 
33 | For example:
34 | 
35 | ```json
36 | #cloud-seed
37 | {
38 |   "hostname": "myserver",
39 |   "files": [
40 |     {
41 |       "path": "/etc/foobar/foobar.conf",
42 |       "content": "Zm9vYmFyCg==",
43 |       "encoding": "base64",
44 |       "owner": "root:root",
45 |       "permissions": "0644",
46 |       "append": false
47 |     }
48 |   ]
49 | }
50 | ```
51 | 
52 | If `hostname` is set, it will be passed to `sethostname(2)` to set the system hostname when **cloud-seed** runs.
53 | 
54 | If `files` is set, each object in the array describes a file that will be written by **cloud-seed**. The supported fields are:
55 | 
56 | | Field | Description |
57 | | --- | --- |
58 | | `path` | Required. The path to the file to be written. Parent directories are created as needed. Relative paths are interpreted relative to **cloud-seed**'s working directory. |
59 | | `content` | The content to be written, encoded according to the `encoding` key. Defaults to no content. |
60 | | `encoding` | The encoding of the `content` value. Can be `plain` (the default), `base64` or `base64gzip`. Rather than using the `base64gzip` encoding, consider compressing the entire user data with gzip. |
61 | | `owner` | The user and group that should own the file, in the format `user:group`. Defaults to the user that is running **cloud-seed** and their primary group. |
62 | | `permissions` | The mode that files should be created with, specified as an octal string. Defaults to `0644`. If the file already exists, **cloud-seed** will not change its mode. |
63 | | `append` | If `true`, the `content` will be appended to the file if it already exists. If `false` (the default), the file will be truncated before the content is written. |
64 | 
65 | ## Note about sensitive data
66 | 
67 | The user data on cloud systems is not generally appropriate for the storage of sensitive data, and therefore tools like **cloud-seed** (or cloud-init) should not be used to seed credentials or other sensitive data onto servers. Use functionality such as instance roles and temporary credentials to grant permissions to servers.
68 | 
69 | ## Supported data sources
70 | 
71 | **cloud-seed** can currently fetch user data from the metadata servers of:
72 | 
73 | * Alibaba Cloud
74 | * AWS
75 | * Exoscale
76 | * Google Cloud
77 | * OpenStack
78 | * Oracle Cloud
79 | * Vultr
80 | 
81 | Pull requests are welcome to add additional data sources.
82 | 
83 | DMI data is used to automatically detect which cloud **cloud-seed** is running in.
84 | 
85 | ## Compatibility with cloud-init
86 | 
87 | For compatibility with **cloud-init**, YAML is supported, the `#cloud-config` shebang is accepted, `fqdn` is accepted as an alias for `hostname`, and `write_files` is accepted as an alias for `files`. The `encoding` field for each file also supports **cloud-init** values `b64`, `gz+base64`, `gzip+base64`, `gz+b64` and `gzip+b64` as aliases for the corresponding **cloud-seed** values.
88 | 
89 | All other **cloud-init** directives are ignored. If **cloud-init** compatibility is not required, it is recommended to use **cloud-seed**'s JSON format described above.
90 | 
91 | ## Platform support
92 | 
93 | Linux, Windows, macOS, FreeBSD, Android (21+). Other platforms may work.
94 | 
95 | ## License
96 | 
97 | MIT or Apache 2.0, at your option.
98 | 


--------------------------------------------------------------------------------
/cloud-seed.service:
--------------------------------------------------------------------------------
 1 | [Unit]
 2 | Description=cloud-seed
 3 | Requires=network-online.target
 4 | After=network-online.target
 5 | 
 6 | # If cloud-seed fails, try again every 5 seconds for 30 seconds. If it still
 7 | # fails, reboot the system. If your use of cloud-seed is not critical to system
 8 | # operation, you may consider changing the FailureAction setting.
 9 | StartLimitBurst=6
10 | StartLimitIntervalSec=5
11 | FailureAction=reboot
12 | 
13 | [Service]
14 | Type=oneshot
15 | RemainAfterExit=true
16 | Restart=on-failure
17 | 
18 | ExecStart=/usr/bin/cloud-seed
19 | Environment=RUST_LOG=debug
20 | StandardOutput=journal+console
21 | 
22 | # You can set a more restrictive umask here to restrict the permissions that
23 | # cloud-seed can create files with.
24 | UMask=0000
25 | 
26 | # cloud-seed can run as a non-root user. In this case, files can only be
27 | # written at paths that this user has permission to write to.
28 | # User=
29 | 
30 | [Install]
31 | WantedBy=multi-user.target
32 | 


--------------------------------------------------------------------------------
/src/execute.rs:
--------------------------------------------------------------------------------
 1 | use anyhow::Context;
 2 | use async_compression::tokio::write::GzipDecoder;
 3 | use base64::{engine::general_purpose::STANDARD as b64, Engine};
 4 | use futures_util::stream::{self, StreamExt as _};
 5 | use nix::unistd::{chown, Group, User};
 6 | use tokio::{fs, io::AsyncWriteExt as _};
 7 | use tracing::error;
 8 | 
 9 | use crate::schema::{Encoding, UserData};
10 | 
11 | #[tracing::instrument(level = "debug")]
12 | pub async fn execute_user_data(user_data: UserData<'_>) {
13 |   if let Some(hostname) = user_data.hostname {
14 |     if let Err(e) = hostname::set(&*hostname) {
15 |       error!("Failed to set hostname: {:?}", e);
16 |     }
17 |   }
18 | 
19 |   stream::iter(user_data.files)
20 |     .for_each_concurrent(None, |file| async move {
21 |       let path = file.path.as_ref();
22 |       let write_file = async move {
23 |         if let Some(parent) = path.parent() {
24 |           fs::create_dir_all(parent).await?;
25 |         }
26 | 
27 |         let mut writer = fs::OpenOptions::new()
28 |           .create(true)
29 |           .truncate(!file.append)
30 |           .append(file.append)
31 |           .mode(u32::from_str_radix(&file.permissions, 8)?)
32 |           .write(true)
33 |           .read(false)
34 |           .open(&path)
35 |           .await?;
36 | 
37 |         if let Some(owner) = file.owner {
38 |           if let Some((user, group)) = owner.split_once(':') {
39 |             let user = User::from_name(user)?.context("no such user")?;
40 |             let group = Group::from_name(group)?.context("no such group")?;
41 |             chown(path, Some(user.uid), Some(group.gid))?;
42 |           }
43 |         }
44 | 
45 |         match file.encoding {
46 |           Encoding::Plain => writer.write_all(file.content.as_bytes()).await?,
47 |           Encoding::Base64 => {
48 |             let decoded = b64.decode(file.content.as_ref())?;
49 |             writer.write_all(&decoded).await?;
50 |           },
51 |           Encoding::Base64Gzip => {
52 |             let decoded = b64.decode(file.content.as_ref())?;
53 |             let mut decompresser = GzipDecoder::new(writer);
54 |             decompresser.write_all(&decoded).await?;
55 |             decompresser.flush().await?;
56 |             writer = decompresser.into_inner();
57 |           },
58 |         }
59 | 
60 |         writer.flush().await?;
61 | 
62 |         Ok::<_, anyhow::Error>(())
63 |       };
64 | 
65 |       if let Err(e) = write_file.await {
66 |         error!("Failed to write file {:?}: {:?}", path, e);
67 |       }
68 |     })
69 |     .await;
70 | }
71 | 


--------------------------------------------------------------------------------
/src/main.rs:
--------------------------------------------------------------------------------
 1 | mod execute;
 2 | mod schema;
 3 | mod source;
 4 | 
 5 | use anyhow::{bail, Result};
 6 | use source::Source;
 7 | use tracing::{debug, info};
 8 | 
 9 | use crate::execute::execute_user_data;
10 | 
11 | const SOURCES: &[&dyn Source] = &[
12 |   #[cfg(feature = "source-alibaba")]
13 |   &source::alibaba::AlibabaSource,
14 |   #[cfg(feature = "source-amazon")]
15 |   &source::amazon::AmazonSource,
16 |   #[cfg(feature = "source-exoscale")]
17 |   &source::exoscale::ExoscaleSource,
18 |   #[cfg(feature = "source-google")]
19 |   &source::google::GoogleSource,
20 |   #[cfg(feature = "source-openstack")]
21 |   &source::openstack::OpenstackSource,
22 |   #[cfg(feature = "source-oracle")]
23 |   &source::oracle::OracleSource,
24 |   #[cfg(feature = "source-vultr")]
25 |   &source::vultr::VultrSource,
26 | ];
27 | 
28 | const ALLOWED_SHEBANGS: [&str; 2] = [
29 |   "#cloud-seed",
30 |   // Compatibility with cloud-init's write_files
31 |   "#cloud-config",
32 | ];
33 | 
34 | #[tokio::main]
35 | async fn main() -> Result<()> {
36 |   tracing_subscriber::fmt::init();
37 | 
38 |   for source in SOURCES {
39 |     debug!("Trying {:?}", source);
40 |     if let Some(user_data) = source.try_fetch().await? {
41 |       info!("Got user data from {:?}", source);
42 |       if let Some((shebang, content)) = user_data.split_once('\n') {
43 |         if ALLOWED_SHEBANGS.contains(&shebang.trim()) {
44 |           let user_data = serde_yaml::from_str(content)?;
45 |           info!("Executing user data from {:?}", source);
46 |           execute_user_data(user_data).await;
47 |           return Ok(());
48 |         }
49 | 
50 |         bail!("Unhandled shebang in user data");
51 |       }
52 | 
53 |       bail!("Malformed user data");
54 |     }
55 |   }
56 | 
57 |   bail!("No suitable source found");
58 | }
59 | 


--------------------------------------------------------------------------------
/src/schema.rs:
--------------------------------------------------------------------------------
 1 | use std::{borrow::Cow, path::Path};
 2 | 
 3 | use serde::Deserialize;
 4 | 
 5 | #[derive(Deserialize, Debug)]
 6 | pub struct UserData<'a> {
 7 |   #[serde(default, borrow, alias = "fqdn")]
 8 |   pub hostname: Option<Cow<'a, str>>,
 9 |   #[serde(default, borrow, alias = "write_files")]
10 |   pub files: Vec<File<'a>>,
11 | }
12 | 
13 | fn default_permissions() -> Cow<'static, str> {
14 |   "0644".into()
15 | }
16 | 
17 | #[derive(Deserialize, Debug)]
18 | pub struct File<'a> {
19 |   #[serde(borrow)]
20 |   pub path: Cow<'a, Path>,
21 |   #[serde(borrow, default)]
22 |   pub content: Cow<'a, str>,
23 |   #[serde(borrow, default)]
24 |   pub owner: Option<Cow<'a, str>>,
25 |   #[serde(borrow, default = "default_permissions")]
26 |   pub permissions: Cow<'a, str>,
27 |   #[serde(default)]
28 |   pub encoding: Encoding,
29 |   #[serde(default)]
30 |   pub append: bool,
31 | }
32 | 
33 | #[derive(Deserialize, Debug, Clone, Copy, Default)]
34 | #[serde(rename_all = "lowercase")]
35 | pub enum Encoding {
36 |   #[serde(alias = "text/plain")]
37 |   #[default]
38 |   Plain,
39 |   #[serde(alias = "b64")]
40 |   Base64,
41 |   #[serde(alias = "gz+base64")]
42 |   #[serde(alias = "gzip+base64")]
43 |   #[serde(alias = "gz+b64")]
44 |   #[serde(alias = "gzip+b64")]
45 |   Base64Gzip,
46 | }
47 | 


--------------------------------------------------------------------------------
/src/source.rs:
--------------------------------------------------------------------------------
 1 | pub mod helpers;
 2 | 
 3 | #[cfg(feature = "source-alibaba")]
 4 | pub mod alibaba;
 5 | #[cfg(feature = "source-amazon")]
 6 | pub mod amazon;
 7 | #[cfg(feature = "source-exoscale")]
 8 | pub mod exoscale;
 9 | #[cfg(feature = "source-google")]
10 | pub mod google;
11 | #[cfg(feature = "source-openstack")]
12 | pub mod openstack;
13 | #[cfg(feature = "source-oracle")]
14 | pub mod oracle;
15 | #[cfg(feature = "source-vultr")]
16 | pub mod vultr;
17 | 
18 | #[async_trait::async_trait]
19 | pub trait Source: std::fmt::Debug {
20 |   async fn try_fetch(&self) -> anyhow::Result<Option<String>>;
21 | }
22 | 


--------------------------------------------------------------------------------
/src/source/alibaba.rs:
--------------------------------------------------------------------------------
 1 | use anyhow::Context;
 2 | 
 3 | use crate::source::helpers::{get_dmi_id, http_get};
 4 | 
 5 | #[derive(Debug, Clone, Copy)]
 6 | pub struct AlibabaSource;
 7 | 
 8 | #[async_trait::async_trait]
 9 | impl super::Source for AlibabaSource {
10 |   async fn try_fetch(&self) -> anyhow::Result<Option<String>> {
11 |     if get_dmi_id("product_name").await?.as_deref() != Some("Alibaba Cloud ECS") {
12 |       return Ok(None);
13 |     }
14 | 
15 |     Ok(Some(
16 |       http_get("http://100.100.100.200/latest/user-data", None)
17 |         .await?
18 |         .context("no user data")?,
19 |     ))
20 |   }
21 | }
22 | 


--------------------------------------------------------------------------------
/src/source/amazon.rs:
--------------------------------------------------------------------------------
 1 | use crate::source::helpers::get_dmi_id;
 2 | 
 3 | #[derive(Debug, Clone, Copy)]
 4 | pub struct AmazonSource;
 5 | 
 6 | #[async_trait::async_trait]
 7 | impl super::Source for AmazonSource {
 8 |   async fn try_fetch(&self) -> anyhow::Result<Option<String>> {
 9 |     if get_dmi_id("bios_vendor").await?.as_deref() != Some("Amazon EC2") {
10 |       return Ok(None);
11 |     }
12 | 
13 |     let imds_client = aws_config::imds::Client::builder().build().await?;
14 |     let user_data = imds_client.get("/latest/user-data").await?;
15 |     Ok(Some(user_data))
16 |   }
17 | }
18 | 


--------------------------------------------------------------------------------
/src/source/exoscale.rs:
--------------------------------------------------------------------------------
 1 | use anyhow::Context;
 2 | 
 3 | use crate::source::helpers::{get_dmi_id, http_get};
 4 | 
 5 | #[derive(Debug, Clone, Copy)]
 6 | pub struct ExoscaleSource;
 7 | 
 8 | #[async_trait::async_trait]
 9 | impl super::Source for ExoscaleSource {
10 |   async fn try_fetch(&self) -> anyhow::Result<Option<String>> {
11 |     if get_dmi_id("product_name").await?.as_deref() != Some("Exoscale Compute Platform") {
12 |       return Ok(None);
13 |     }
14 | 
15 |     Ok(Some(
16 |       http_get("http://169.254.169.254/latest/user-data", None)
17 |         .await?
18 |         .context("no user data")?,
19 |     ))
20 |   }
21 | }
22 | 


--------------------------------------------------------------------------------
/src/source/google.rs:
--------------------------------------------------------------------------------
 1 | use std::iter;
 2 | 
 3 | use anyhow::Context;
 4 | use base64::{engine::general_purpose::STANDARD as b64, Engine};
 5 | use hyper::header::{HeaderMap, HeaderName, HeaderValue};
 6 | use serde::Deserialize;
 7 | 
 8 | use crate::source::helpers::{get_dmi_id, http_get};
 9 | 
10 | #[derive(Debug, Clone, Copy)]
11 | pub struct GoogleSource;
12 | 
13 | #[derive(Deserialize, Debug, Clone, Copy, PartialEq)]
14 | #[serde(rename_all = "lowercase")]
15 | enum UserDataEncoding {
16 |   Base64,
17 | }
18 | 
19 | #[async_trait::async_trait]
20 | impl super::Source for GoogleSource {
21 |   async fn try_fetch(&self) -> anyhow::Result<Option<String>> {
22 |     if get_dmi_id("product_name").await?.as_deref() != Some("Google Compute Engine") {
23 |       return Ok(None);
24 |     }
25 | 
26 |     let headers: HeaderMap = iter::once((
27 |       HeaderName::from_static("metadata-flavor"),
28 |       HeaderValue::from_static("Google"),
29 |     ))
30 |     .collect();
31 | 
32 |     let encoding = http_get(
33 |       "http://metadata.google.internal/computeMetadata/v1/instance/attributes/user-data-encoding",
34 |       Some(headers.clone()),
35 |     )
36 |     .await?;
37 |     let encoding: Option<UserDataEncoding> = encoding
38 |       .map(|body| serde_json::from_str(&body))
39 |       .transpose()?;
40 | 
41 |     let mut user_data = http_get(
42 |       "http://metadata.google.internal/computeMetadata/v1/instance/attributes/user-data",
43 |       Some(headers),
44 |     )
45 |     .await?
46 |     .context("no user data")?;
47 |     if encoding == Some(UserDataEncoding::Base64) {
48 |       user_data = String::from_utf8(b64.decode(&user_data)?)?;
49 |     }
50 |     Ok(Some(user_data))
51 |   }
52 | }
53 | 


--------------------------------------------------------------------------------
/src/source/helpers.rs:
--------------------------------------------------------------------------------
  1 | use anyhow::Result;
  2 | use tokio::io;
  3 | 
  4 | #[tracing::instrument(level = "debug")]
  5 | pub async fn get_dmi_id(key: &str) -> Result<Option<String>> {
  6 |   match tokio::fs::read_to_string(format!("/sys/devices/virtual/dmi/id/{key}")).await {
  7 |     Ok(value) => Ok(Some(value.trim().into())),
  8 |     Err(e) if e.kind() == io::ErrorKind::NotFound => Ok(None),
  9 |     Err(e) => Err(e.into()),
 10 |   }
 11 | }
 12 | 
 13 | #[cfg(feature = "helper-http")]
 14 | #[tracing::instrument(level = "debug")]
 15 | pub async fn http_get(
 16 |   url: &str,
 17 |   maybe_headers: Option<hyper::HeaderMap<hyper::header::HeaderValue>>,
 18 | ) -> Result<Option<String>> {
 19 |   use std::io::{Cursor, Read as _};
 20 | 
 21 |   use anyhow::{anyhow, Context};
 22 |   use async_compression::tokio::bufread::GzipDecoder;
 23 |   use base64::{engine::general_purpose::STANDARD as b64, Engine};
 24 |   use flate2::read::GzDecoder;
 25 |   use futures_util::{
 26 |     pin_mut,
 27 |     stream::{StreamExt, TryStreamExt},
 28 |   };
 29 |   use hyper::{Client, StatusCode};
 30 |   use once_cell::sync::Lazy;
 31 |   use tokio::io::AsyncReadExt as _;
 32 |   use tokio_util::io::StreamReader;
 33 | 
 34 |   static CLIENT: Lazy<Client<hyper::client::HttpConnector>> = Lazy::new(Client::new);
 35 | 
 36 |   let mut builder = hyper::Request::get(url).header("user-agent", "cloud-seed");
 37 |   if let Some(headers) = maybe_headers {
 38 |     *builder.headers_mut().unwrap() = headers;
 39 |   }
 40 | 
 41 |   let response = CLIENT.request(builder.body(hyper::Body::empty())?).await?;
 42 |   let status = response.status();
 43 | 
 44 |   if status.is_success() {
 45 |     let body_chunks_stream = response
 46 |       .into_body()
 47 |       .map_err(|e| io::Error::new(io::ErrorKind::Other, e))
 48 |       .peekable();
 49 |     pin_mut!(body_chunks_stream);
 50 | 
 51 |     let first_chunk = body_chunks_stream
 52 |       .as_mut()
 53 |       .peek()
 54 |       .await
 55 |       .context("early EOF")?
 56 |       .as_ref()
 57 |       .map_err(|_| anyhow!("failed to read response"))?;
 58 | 
 59 |     #[derive(Clone, Copy)]
 60 |     enum Format {
 61 |       Plain,
 62 |       Gzip,
 63 |       Base64Gzip,
 64 |     }
 65 | 
 66 |     // Check if the first chunk starts with the gzip magic bytes
 67 |     let format = match first_chunk[0..3] {
 68 |       [0x1f, 0x8b, _] => Format::Gzip,
 69 |       [b'H', b'4', b's'] => Format::Base64Gzip,
 70 |       _ => Format::Plain,
 71 |     };
 72 | 
 73 |     let mut body_reader = StreamReader::new(body_chunks_stream);
 74 |     let mut s = String::new();
 75 |     match format {
 76 |       Format::Gzip => {
 77 |         let mut decoder = GzipDecoder::new(body_reader);
 78 |         decoder.read_to_string(&mut s).await?;
 79 |       },
 80 |       Format::Base64Gzip => {
 81 |         body_reader.read_to_string(&mut s).await?;
 82 |         // TODO: consider ways to do this without buffering + blocking
 83 |         let decoded = b64.decode(&s)?;
 84 |         let mut decoder = GzDecoder::new(Cursor::new(decoded));
 85 |         s.clear();
 86 |         decoder.read_to_string(&mut s)?;
 87 |       },
 88 |       Format::Plain => {
 89 |         body_reader.read_to_string(&mut s).await?;
 90 |       },
 91 |     }
 92 |     Ok(Some(s))
 93 |   }
 94 |   else if status == StatusCode::NOT_FOUND {
 95 |     Ok(None)
 96 |   }
 97 |   else {
 98 |     Err(anyhow!("HTTP {}", status))
 99 |   }
100 | }
101 | 


--------------------------------------------------------------------------------
/src/source/openstack.rs:
--------------------------------------------------------------------------------
 1 | use anyhow::Context;
 2 | 
 3 | use crate::source::helpers::{get_dmi_id, http_get};
 4 | 
 5 | #[derive(Debug, Clone, Copy)]
 6 | pub struct OpenstackSource;
 7 | 
 8 | #[async_trait::async_trait]
 9 | impl super::Source for OpenstackSource {
10 |   async fn try_fetch(&self) -> anyhow::Result<Option<String>> {
11 |     if get_dmi_id("sys_vendor").await?.as_deref() != Some("OpenStack Foundation") {
12 |       return Ok(None);
13 |     }
14 | 
15 |     Ok(Some(
16 |       http_get("http://169.254.169.254/latest/user-data", None)
17 |         .await?
18 |         .context("no user data")?,
19 |     ))
20 |   }
21 | }
22 | 


--------------------------------------------------------------------------------
/src/source/oracle.rs:
--------------------------------------------------------------------------------
 1 | use std::iter;
 2 | 
 3 | use anyhow::Context;
 4 | use hyper::header::{HeaderName, HeaderValue};
 5 | 
 6 | use crate::source::helpers::{get_dmi_id, http_get};
 7 | 
 8 | #[derive(Debug, Clone, Copy)]
 9 | pub struct OracleSource;
10 | 
11 | #[async_trait::async_trait]
12 | impl super::Source for OracleSource {
13 |   async fn try_fetch(&self) -> anyhow::Result<Option<String>> {
14 |     if get_dmi_id("chassis_asset_tag").await?.as_deref() != Some("OracleCloud.com") {
15 |       return Ok(None);
16 |     }
17 | 
18 |     let headers = iter::once((
19 |       HeaderName::from_static("authorization"),
20 |       HeaderValue::from_static("Bearer Oracle"),
21 |     ))
22 |     .collect();
23 |     Ok(Some(
24 |       http_get(
25 |         "http://169.254.169.254/opc/v2/instance/metadata/user_data",
26 |         Some(headers),
27 |       )
28 |       .await?
29 |       .context("no user data")?,
30 |     ))
31 |   }
32 | }
33 | 


--------------------------------------------------------------------------------
/src/source/vultr.rs:
--------------------------------------------------------------------------------
 1 | use std::iter;
 2 | 
 3 | use anyhow::Context;
 4 | use hyper::header::{HeaderName, HeaderValue};
 5 | use serde::Deserialize;
 6 | 
 7 | use crate::source::helpers::{get_dmi_id, http_get};
 8 | 
 9 | #[derive(Debug, Clone, Copy)]
10 | pub struct VultrSource;
11 | 
12 | #[derive(Deserialize, Debug)]
13 | #[serde(rename_all = "kebab-case")]
14 | struct Metadata {
15 |   user_data: Option<String>,
16 | }
17 | 
18 | #[async_trait::async_trait]
19 | impl super::Source for VultrSource {
20 |   async fn try_fetch(&self) -> anyhow::Result<Option<String>> {
21 |     if get_dmi_id("bios_vendor").await?.as_deref() != Some("Vultr") {
22 |       return Ok(None);
23 |     }
24 | 
25 |     let headers = iter::once((
26 |       HeaderName::from_static("metadata-token"),
27 |       HeaderValue::from_static("cloudinit"),
28 |     ))
29 |     .collect();
30 |     let body = http_get("http://169.254.169.254/v1.json", Some(headers))
31 |       .await?
32 |       .context("no user data")?;
33 |     let metadata: Metadata = serde_json::from_str(&body)?;
34 |     Ok(metadata.user_data)
35 |   }
36 | }
37 | 


--------------------------------------------------------------------------------