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+"checksum wasm-bindgen-macro 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)" = "7c568f4d3cf6d7c1d72b165daf778fb0d6e09a24f96ac14fc8c4f66a96e86b72"
+"checksum wasm-bindgen-macro-support 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)" = "430d12539ae324d16097b399e9d07a6d5ce0173b2a61a2d02346ca7c198daffe"
+"checksum wasm-bindgen-shared 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)" = "8ae7167f0bbffd7fac2b12da0fa1f834c1d84671a1ae3c93ac8bde2e97179c39"
+"checksum wasm-bindgen-webidl 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)" = "3021567c515a746a64ad0b269d120d46e687c0c95702a4750623db935ae6b5e7"
+"checksum web-sys 0.3.31 (registry+https://github.com/rust-lang/crates.io-index)" = "ce8e893e021539beb87de8f06e77bdb390a3ab0db4cfeb569c4e377b55ed20de"
+"checksum webpki 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d7e664e770ac0110e2384769bcc59ed19e329d81f555916a6e072714957b81b4"
+"checksum webpki-roots 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a262ae37dd9d60f60dd473d1158f9fbebf110ba7b6a5051c8160460f6043718b"
+"checksum weedle 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3bb43f70885151e629e2a19ce9e50bd730fd436cfd4b666894c9ce4de9141164"
+"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
+"checksum winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
+"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
+"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+"checksum winreg 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "b2986deb581c4fe11b621998a5e53361efe6b48a151178d0cd9eeffa4dc6acc9"
+"checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
diff --git a/extras/repo-canary/Cargo.toml b/extras/repo-canary/Cargo.toml
new file mode 100644
index 00000000000..da58630543b
--- /dev/null
+++ b/extras/repo-canary/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "repo-canary"
+version = "0.1.0"
+authors = ["Erikson Tung <etung@amazon.com>"]
+edition = "2018"
+publish = false
+
+[dependencies]
+log = "0.4"
+rand = "0.7.0"
+reqwest = { version = "0.9.17", default-features = false, features = ["rustls-tls"] }
+simplelog = "0.7"
+snafu = "0.5.0"
+tough = { version = "0.1.0", features = ["http"] }
diff --git a/extras/repo-canary/Dockerfile b/extras/repo-canary/Dockerfile
new file mode 100644
index 00000000000..50705b428ec
--- /dev/null
+++ b/extras/repo-canary/Dockerfile
@@ -0,0 +1,17 @@
+FROM rust:1.38.0 as builder
+WORKDIR /opt/build
+COPY . .
+RUN cargo install --path . --force -q
+
+FROM amazonlinux:2
+ARG METADATA_BASE_URL
+ENV METADATA_BASE_URL $METADATA_BASE_URL
+ARG TARGET_BASE_URL
+ENV TARGET_BASE_URL $TARGET_BASE_URL
+RUN yum -y update && yum clean all
+RUN mkdir -p /usr/share/repo-canary
+
+COPY root.json /usr/share/repo-canary/
+COPY --from=builder /opt/build/target/release/repo-canary /usr/bin/
+
+CMD /usr/bin/repo-canary --metadata-base-url $METADATA_BASE_URL --target-base-url $TARGET_BASE_URL --percentage-of-targets-to-retrieve 50
diff --git a/extras/repo-canary/root.json b/extras/repo-canary/root.json
new file mode 100644
index 00000000000..ae6349a39a0
--- /dev/null
+++ b/extras/repo-canary/root.json
@@ -0,0 +1,117 @@
+{
+  "signed": {
+    "_type": "root",
+    "consistent_snapshot": true,
+    "expires": "2020-09-22T00:00:00Z",
+    "version": 1,
+    "keys": {
+      "2214c7b9f777b47022c31144a1aa2e6e7ee875413632b9b1b660aff49dba934d": {
+        "keytype": "rsa",
+        "keyval": {
+          "public": "-----BEGIN PUBLIC KEY-----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\nPT7G9OWLRQqNxuxppdS7j3tRfJu8r2uQXoYjeEzSV43lAgMBAAE=\n-----END PUBLIC KEY-----"
+        },
+        "scheme": "rsassa-pss-sha256"
+      },
+      "4b63b9585fee20065e2f8e5ff5d17e95f6afdef716dcf96d92ec10df4069817c": {
+        "keytype": "rsa",
+        "keyval": {
+          "public": "-----BEGIN PUBLIC KEY-----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\nv7JBQSvgcov3gEg5wCZBv5AwKK+DP2nTqDBsqFd4592zAgMBAAE=\n-----END PUBLIC KEY-----"
+        },
+        "scheme": "rsassa-pss-sha256"
+      },
+      "4d6464f48c11e74cf1b87e3da3bac1ce884e003cedc83e054d0f5371769d3028": {
+        "keytype": "rsa",
+        "keyval": {
+          "public": "-----BEGIN PUBLIC KEY-----\nMIIBojANBgkqhkiG9w0BAQEFAAOCAY8AMIIBigKCAYEAoxNqMjup9f/E7CkCqXz8\nXkolCUVNiZV/J7iAQE8ckMNWuycxBuMInJIbGMVaUMQbn0lhsv0zG5Rgaw9Ea3MV\nvsgIALiN/XB05e1TLLiK52E18U1v/59ATgtWg/4mtbdtVK216hzcFauwaaAcckv4\nTZqnm2PLeoVfvULXZQ1VrmCNYsFrNCxccMH7vYAThj5EU9G+AULtecDIOWRUhvzQ\nlJRX9Srsq/cZcriNy2voybg73B+gib/JvbfXlesxpJrcLDezPsooBoND9OCL6+Cu\npkQ4r88aezas+DPbLVKtiKmVILS6zC72CEtMaFBM7rhjijjYNmkQoN7oQ/R+8kQG\nfZ9kxhIu1/4eArHNIpWSvCY/+HxuyTKLG8KjiwgV+dSfQKTTBbZlWiRepibLXaX8\nktUiavo5hGKpnkKdL3VCwbrE5yjKuC9FrKN+KMx6Q/y52VfwLX1PdG31i+kDEDer\n//37POVM+O6crFQzSTHTJLHcBFoAYzNMs9HVi7zIrUAZAgMBAAE=\n-----END PUBLIC KEY-----"
+        },
+        "scheme": "rsassa-pss-sha256"
+      },
+      "6f3533d821dc7b99494fdf381f9cd9e666460130efb68339fbfd542c6a7f924b": {
+        "keytype": "rsa",
+        "keyval": {
+          "public": "-----BEGIN PUBLIC KEY-----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\nsn8maHl2xITesGIliTi8Ip/9xxgVI8yJNCr7aX706EPLAgMBAAE=\n-----END PUBLIC KEY-----"
+        },
+        "scheme": "rsassa-pss-sha256"
+      },
+      "86d34b552075e5df7133d45332b52fada2ae3708d9b7e5818fca0342586750ee": {
+        "keytype": "rsa",
+        "keyval": {
+          "public": "-----BEGIN PUBLIC KEY-----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\nZgdtkhNLMizWesWdCRgEI9yfhVpQQzzbwlLoEYbT7mfDAgMBAAE=\n-----END PUBLIC KEY-----"
+        },
+        "scheme": "rsassa-pss-sha256"
+      },
+      "97d2f07c71784a05581492448d02da97a5864b00a505649f3f16f761abc8a9dd": {
+        "keytype": "rsa",
+        "keyval": {
+          "public": "-----BEGIN PUBLIC KEY-----\nMIIBojANBgkqhkiG9w0BAQEFAAOCAY8AMIIBigKCAYEAsU3fjawqA3oPt+O2oAGY\nNihYpLSkoI3FG6SipC0XeaDFb6E1LogIcrelqWbVakhR6Xp5Z377PAZLZlPXFn0L\nRYuN4M7cf423id2nCKcjdgPg/YlAEt6l8TZdUL/JqrKF34jmrE4x3qtciDPHu2OS\n187v48OvBz26LVwRJo93KgK8agPrK/EptpmxSSTjT3T/dtiaEezAk42SpSkhGzCl\nbb13/5LDRa17dxsW/820fZq5XAWI/VG+d769jCwmgDDAXb8g/gDUJqyZONMHHjI7\nADJTLKxozX4eI3s2Hv+UiFica7ZkQXxEKNjGaUDqN+V1gD+iurJaDhFJTmmmtUT/\n2S5m3FK9BGsF0PcKOew7Mys+vMeiIznd+y7xwZcWtgW0X4qfBHMCfV4eNGbSVfDT\nxWlpOLWBXwkun4iqlSEz4tEOQHt/7fYo5z8PCP48iYIgMrCG5UyoTFe+clIUjXrr\nmfD147WViO5SgzFepHIxJKf96gMWb1b/yZQXXUzZ3bWDAgMBAAE=\n-----END PUBLIC KEY-----"
+        },
+        "scheme": "rsassa-pss-sha256"
+      },
+      "aea8d37e5c679dd9577ae799322b881a958cb57a05593cd850b0af70ed7c8483": {
+        "keytype": "rsa",
+        "keyval": {
+          "public": "-----BEGIN PUBLIC KEY-----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\nN1E2xefnoXFbO7v7/+/HaW06DLuyFJP70H6U0V9qSXZXAgMBAAE=\n-----END PUBLIC KEY-----"
+        },
+        "scheme": "rsassa-pss-sha256"
+      },
+      "f6dad0e00970870a3642717a068a2e84059f0d76913f87f5940766e9567fcfb5": {
+        "keytype": "rsa",
+        "keyval": {
+          "public": "-----BEGIN PUBLIC KEY-----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\nsJI+JRsZ4DbeNhq7nCV94Fy2WLUA7fDOGm8lT4VBVLYxAgMBAAE=\n-----END PUBLIC KEY-----"
+        },
+        "scheme": "rsassa-pss-sha256"
+      }
+    },
+    "spec_version": "1.0",
+    "roles": {
+      "root": {
+        "keyids": [
+          "97d2f07c71784a05581492448d02da97a5864b00a505649f3f16f761abc8a9dd",
+          "6f3533d821dc7b99494fdf381f9cd9e666460130efb68339fbfd542c6a7f924b",
+          "4d6464f48c11e74cf1b87e3da3bac1ce884e003cedc83e054d0f5371769d3028"
+        ],
+        "threshold": 2
+      },
+      "snapshot": {
+        "keyids": [
+          "4b63b9585fee20065e2f8e5ff5d17e95f6afdef716dcf96d92ec10df4069817c",
+          "aea8d37e5c679dd9577ae799322b881a958cb57a05593cd850b0af70ed7c8483",
+          "f6dad0e00970870a3642717a068a2e84059f0d76913f87f5940766e9567fcfb5"
+        ],
+        "threshold": 1
+      },
+      "targets": {
+        "keyids": [
+          "4b63b9585fee20065e2f8e5ff5d17e95f6afdef716dcf96d92ec10df4069817c",
+          "aea8d37e5c679dd9577ae799322b881a958cb57a05593cd850b0af70ed7c8483",
+          "f6dad0e00970870a3642717a068a2e84059f0d76913f87f5940766e9567fcfb5"
+        ],
+        "threshold": 1
+      },
+      "timestamp": {
+        "keyids": [
+          "4b63b9585fee20065e2f8e5ff5d17e95f6afdef716dcf96d92ec10df4069817c",
+          "aea8d37e5c679dd9577ae799322b881a958cb57a05593cd850b0af70ed7c8483",
+          "f6dad0e00970870a3642717a068a2e84059f0d76913f87f5940766e9567fcfb5",
+          "86d34b552075e5df7133d45332b52fada2ae3708d9b7e5818fca0342586750ee",
+          "2214c7b9f777b47022c31144a1aa2e6e7ee875413632b9b1b660aff49dba934d"
+        ],
+        "threshold": 1
+      }
+    }
+  },
+  "signatures": [
+    {
+      "keyid": "4d6464f48c11e74cf1b87e3da3bac1ce884e003cedc83e054d0f5371769d3028",
+      "sig": "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"
+    },
+    {
+      "keyid": "6f3533d821dc7b99494fdf381f9cd9e666460130efb68339fbfd542c6a7f924b",
+      "sig": "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"
+    },
+    {
+      "keyid": "97d2f07c71784a05581492448d02da97a5864b00a505649f3f16f761abc8a9dd",
+      "sig": "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"
+    }
+  ]
+}
diff --git a/extras/repo-canary/src/main.rs b/extras/repo-canary/src/main.rs
new file mode 100644
index 00000000000..0a670cfe434
--- /dev/null
+++ b/extras/repo-canary/src/main.rs
@@ -0,0 +1,257 @@
+#![deny(rust_2018_idioms)]
+#![warn(clippy::pedantic)]
+
+#[macro_use]
+extern crate log;
+use rand::seq::SliceRandom;
+use simplelog::{Config as LogConfig, LevelFilter, SimpleLogger};
+use snafu::ResultExt;
+use std::fs::{self, File, OpenOptions};
+use std::path::{Path, PathBuf};
+use std::process;
+use std::str::FromStr;
+use std::string::ToString;
+use std::{env, io};
+use tough::{error as tough_error, Limits, Repository, Settings, HttpTransport};
+
+type HttpRepo<'a> = Repository<'a, HttpTransport>;
+
+const DATASTORE_PATH: &str = "/var/lib/repo-canary";
+const TRUSTED_ROOT_PATH: &str = "/usr/share/repo-canary/root.json";
+
+// Custom exit codes
+const TRUSTED_ROOT_VALIDATION_FAILURE: i32 = 64;
+const METADATA_VALIDATION_FAILURE: i32 = 65;
+const VERSION_MISMATCH: i32 = 66;
+const FETCH_FAILURE: i32 = 67;
+const EXPIRED_METADATA: i32 = 68;
+const MISSING_METADATA: i32 = 69;
+const ROLLBACK_DETECTED: i32 = 70;
+const MISSING_TARGET: i32 = 71;
+const TARGET_DOWNLOAD_FAILURE: i32 = 72;
+const OTHER_ERROR: i32 = 1;
+
+mod error {
+    use snafu::{Backtrace, Snafu};
+    use std::path::PathBuf;
+
+    /// Potential errors during pre-init process.
+    #[derive(Debug, Snafu)]
+    #[snafu(visibility = "pub(super)")]
+    pub(crate) enum RepoCanaryError {
+        #[snafu(display("Failed to open trusted root metadata file {}: {}", path.display(), source))]
+        OpenRoot {
+            path: PathBuf,
+            source: std::io::Error,
+            backtrace: Backtrace,
+        },
+
+        #[snafu(display("Failed to open file {} for writing: {}", path.display(), source))]
+        OpenFile {
+            path: PathBuf,
+            source: std::io::Error,
+            backtrace: Backtrace,
+        },
+
+        #[snafu(display("Failed to create directory {}: {}", directory, source))]
+        CreateDatastoreFailed {
+            directory: &'static str,
+            source: std::io::Error,
+        },
+
+        #[snafu(display("Logger setup error: {}", source))]
+        Logger { source: log::SetLoggerError },
+    }
+}
+
+type Result<T> = std::result::Result<T, error::RepoCanaryError>;
+
+#[derive(Debug)]
+struct Args {
+    log_level: LevelFilter,
+    metadata_base_url: String,
+    target_base_url: String,
+    percent_target_files: u8,
+}
+
+/// Print a usage message in the event a bad arg is passed
+fn usage() -> ! {
+    let program_name = env::args().next().unwrap_or_else(|| "program".to_string());
+    eprintln!(
+        r"Usage: {}
+            --metadata-base-url URL
+            --target-base-url URL
+            [ --percentage-of-targets-to-retrieve 0-100 ] 'Randomly samples specified percentage of targets'
+            [ --log-level trace|debug|info|warn|error ]
+
+            If --percentage-of-targets-to-retrieve is not specified, {} will attempt to retrieve all
+            targets listed in the TUF repository.
+        ",
+        program_name,
+        program_name
+    );
+    process::exit(2);
+}
+
+/// Prints a more specific message before exiting through usage().
+fn usage_msg<S: AsRef<str>>(msg: S) -> ! {
+    eprintln!("{}\n", msg.as_ref());
+    usage();
+}
+
+/// Parse the args to the program and return an Args struct
+fn parse_args(args: env::Args) -> Args {
+    let mut metadata_base_url = None;
+    let mut target_base_url = None;
+    let mut log_level = None;
+    let mut percent_target_files: Option<u8> = None;
+
+    let mut iter = args.skip(1);
+    while let Some(arg) = iter.next() {
+        match arg.as_ref() {
+            "--metadata-base-url" => {
+                metadata_base_url =
+                    Some(iter.next().unwrap_or_else(|| {
+                        usage_msg("Did not give argument to --metadata_base_url")
+                    }))
+            }
+
+            "--target-base-url" => {
+                target_base_url = Some(
+                    iter.next()
+                        .unwrap_or_else(|| usage_msg("Did not give argument to --target_base_url")),
+                )
+            }
+
+            "--percentage-of-targets-to-retrieve" => {
+                let percentage = iter
+                    .next()
+                    .unwrap_or_else(|| {
+                        usage_msg("Did not give argument to --percentage-of-targets-to-retrieve")
+                    })
+                    .parse::<u8>()
+                    .unwrap_or_else(|_| {
+                        usage_msg("Invalid argument: expecting percentage from 0 to 100")
+                    });
+                if percentage > 100 {
+                    usage_msg("Invalid argument: expecting percentage from 0 to 100")
+                }
+                percent_target_files = Some(percentage);
+            }
+
+            "--log-level" => {
+                let log_level_str = iter
+                    .next()
+                    .unwrap_or_else(|| usage_msg("Did not give argument to --log-level"));
+                log_level = Some(LevelFilter::from_str(&log_level_str).unwrap_or_else(|_| {
+                    usage_msg(format!("Invalid log level '{}'", log_level_str))
+                }));
+            }
+
+            _ => usage(),
+        }
+    }
+
+    Args {
+        log_level: log_level.unwrap_or_else(|| LevelFilter::Info),
+        metadata_base_url: metadata_base_url.unwrap_or_else(|| usage()),
+        target_base_url: target_base_url.unwrap_or_else(|| usage()),
+        percent_target_files: percent_target_files.unwrap_or_else(|| 100),
+    }
+}
+
+/// Report errors through custom exit codes to be picked up by Cloudwatch event rules
+// Potentially add other processing/reporting through rusoto?
+fn match_report_tough_error(err: &tough::error::Error) -> i32 {
+    eprintln!("Error: {}", err);
+    match err {
+        tough_error::Error::ExpiredMetadata { .. } => EXPIRED_METADATA,
+        tough_error::Error::MetaMissing { .. } => MISSING_METADATA,
+        tough_error::Error::OlderMetadata { .. } => ROLLBACK_DETECTED,
+        tough_error::Error::VerifyTrustedMetadata { .. } => TRUSTED_ROOT_VALIDATION_FAILURE,
+        tough_error::Error::VerifyMetadata { .. } => METADATA_VALIDATION_FAILURE,
+        tough_error::Error::VersionMismatch { .. } => VERSION_MISMATCH,
+        tough_error::Error::Transport { .. } => FETCH_FAILURE,
+        _ => OTHER_ERROR,
+    }
+}
+
+/// Randomly samples specified percentage of listed targets in the TUF repo and tries to retrieve them
+fn retrieve_percentage_of_targets(repo: &HttpRepo<'_>, percentage: u8) -> Result<i32> {
+    let targets = repo.targets();
+    let percentage = percentage as f32 / 100.0;
+    let num_to_retrieve = (targets.len() as f32 * percentage).ceil();
+    let mut rng = &mut rand::thread_rng();
+    let mut sampled_targets: Vec<String> = targets.keys().map(|key| key.to_string()).collect();
+    sampled_targets = sampled_targets
+        .choose_multiple(&mut rng, num_to_retrieve as usize)
+        .cloned()
+        .collect();
+    for target in sampled_targets {
+        let target_reader = repo.read_target(&target);
+        match target_reader {
+            Err(ref err) => return Ok(match_report_tough_error(err)),
+            Ok(target_reader) => match target_reader {
+                None => {
+                    eprintln!("Missing target: {}", target);
+                    return Ok(MISSING_TARGET);
+                }
+                Some(mut reader) => {
+                    info!("Downloading target: {}", target);
+                    let path = PathBuf::from(DATASTORE_PATH).join(target);
+                    let mut f = OpenOptions::new()
+                        .write(true)
+                        .create(true)
+                        .open(&path)
+                        .context(error::OpenFile { path: &path })?;
+                    if let Err(ref err) = io::copy(&mut reader, &mut f) {
+                        eprintln!("Error: {}", err);
+                        return Ok(TARGET_DOWNLOAD_FAILURE);
+                    }
+                }
+            },
+        };
+    }
+    Ok(0)
+}
+
+fn main() -> Result<()> {
+    // Parse and store the args passed to the program
+    let args = parse_args(env::args());
+
+    SimpleLogger::init(args.log_level, LogConfig::default()).context(error::Logger)?;
+
+    // Create the datastore path for storing the metadata files
+    fs::create_dir_all(DATASTORE_PATH).context(error::CreateDatastoreFailed {
+        directory: DATASTORE_PATH,
+    })?;
+    info!("Loading TUF repo");
+    let transport = HttpTransport::new();
+    let repo = Repository::load(&transport,Settings {
+        root: File::open(TRUSTED_ROOT_PATH).context(error::OpenRoot {
+            path: TRUSTED_ROOT_PATH,
+        })?,
+        datastore: Path::new("/var/lib/repo-canary"),
+        metadata_base_url: &args.metadata_base_url,
+        target_base_url: &args.target_base_url,
+        limits: Limits {
+            max_root_size: 1024 * 1024,         // 1 MiB
+            max_targets_size: 1024 * 1024 * 10, // 10 MiB
+            max_timestamp_size: 1024 * 1024,    // 1 MiB
+            max_root_updates: 1024,
+        },
+    });
+    // Check for errors from loading the TUF repository
+    std::process::exit(match &repo {
+        Err(err) => match_report_tough_error(err),
+        Ok(repo) => {
+            info!("Loaded TUF repo");
+            // Try retrieving listed targets
+            info!(
+                "Downloading {}% of listed targets",
+                args.percent_target_files
+            );
+            retrieve_percentage_of_targets(repo, args.percent_target_files)?
+        }
+    });
+}
diff --git a/tools/infra/tuf-repo-canary/RepoCanary.template.yaml b/tools/infra/tuf-repo-canary/RepoCanary.template.yaml
new file mode 100644
index 00000000000..9287e9426b6
--- /dev/null
+++ b/tools/infra/tuf-repo-canary/RepoCanary.template.yaml
@@ -0,0 +1,257 @@
+Parameters:
+  TaskName:
+    Type: String
+    Default: tuf-repo-canary
+Resources:
+  VPC:
+    Type: 'AWS::EC2::VPC'
+    Properties:
+      CidrBlock: 10.0.0.0/16
+  VPCSubnet:
+    Type: 'AWS::EC2::Subnet'
+    Properties:
+      CidrBlock: 10.0.0.0/24
+      VpcId: !Ref VPC
+  VPCInternetGateway:
+    Type: 'AWS::EC2::InternetGateway'
+  AttachGateway:
+    Type: 'AWS::EC2::VPCGatewayAttachment'
+    Properties:
+      VpcId: !Ref VPC
+      InternetGatewayId: !Ref VPCInternetGateway
+  VPCRouteTable:
+    Type: 'AWS::EC2::RouteTable'
+    Properties:
+      VpcId: !Ref VPC
+  ExternalRoute:
+    Type: 'AWS::EC2::Route'
+    Properties:
+      DestinationCidrBlock: 0.0.0.0/0
+      GatewayId: !Ref VPCInternetGateway
+      RouteTableId: !Ref VPCRouteTable
+  SubnetRouteAssociation:
+    Type: 'AWS::EC2::SubnetRouteTableAssociation'
+    Properties:
+      RouteTableId: !Ref VPCRouteTable
+      SubnetId: !Ref VPCSubnet
+  VPCSecurityGroup:
+    Type: 'AWS::EC2::SecurityGroup'
+    Properties:
+      GroupDescription: !Sub 'Allow traffic to ${TaskName}'
+      VpcId: !Ref VPC
+  LogGroup:
+    Type: 'AWS::Logs::LogGroup'
+    Properties:
+      LogGroupName: !Sub '/ecs/${TaskName}'
+      RetentionInDays: 30
+  FailedStartLogGroup:
+    Type: 'AWS::Logs::LogGroup'
+    Properties:
+      LogGroupName: !Sub '/aws/events/${TaskName}-start-failures'
+  RepoValidationFailureLogGroup:
+    Type: 'AWS::Logs::LogGroup'
+    Properties:
+      LogGroupName: '/aws/events/tuf-repo-validation-failures'
+  TUFRepoCanarySNSNotificationTopic:
+    Type: 'AWS::SNS::Topic'
+    Properties:
+      DisplayName: TUF Repo Canary Notifications
+  TUFRepoCanarySNSSubscription:
+    Type: 'AWS::SNS::Subscription'
+    Properties:
+      Endpoint: etung@amazon.com
+      Protocol: email
+      TopicArn: !Ref TUFRepoCanarySNSNotificationTopic
+  TUFRepoCanaryImgRepo:
+    Type: 'AWS::ECR::Repository'
+    Properties:
+      RepositoryName: !Sub '${TaskName}'
+  ECSCluster:
+    Type: 'AWS::ECS::Cluster'
+    Properties: {}
+  TUFRepoCanaryTask:
+    Type: 'AWS::ECS::TaskDefinition'
+    Properties:
+      TaskRoleArn: !GetAtt TUFRepoCanaryTaskExecutionRole.Arn
+      ExecutionRoleArn: !GetAtt TUFRepoCanaryTaskExecutionRole.Arn
+      Family: !Sub '${TaskName}'
+      NetworkMode: awsvpc
+      Cpu: '256'
+      Memory: '512'
+      RequiresCompatibilities:
+        - FARGATE
+      ContainerDefinitions:
+        - Memory: 512
+          Cpu: 256
+          Image: !Join
+            - /
+            - - !Join
+                - .
+                - - !Ref 'AWS::AccountId'
+                  - dkr.ecr
+                  - !Ref 'AWS::Region'
+                  - amazonaws.com
+              - !Sub '${TaskName}:latest'
+          Name: !Sub '${TaskName}'
+          LogConfiguration:
+            LogDriver: awslogs
+            Options:
+              awslogs-group: !Ref LogGroup
+              awslogs-region: us-west-2
+              awslogs-stream-prefix: 'ecs'
+  TUFRepoCanaryTaskExecutionRole:
+    Type: 'AWS::IAM::Role'
+    Properties:
+      RoleName: TUFRepoCanaryTaskExecutionRole
+      AssumeRolePolicyDocument:
+        Statement:
+          - Effect: Allow
+            Principal:
+              Service: ecs-tasks.amazonaws.com
+            Action:
+              - 'sts:AssumeRole'
+      Policies:
+        - PolicyName: AmazonECSTaskExecutionPolicy
+          PolicyDocument:
+            Statement:
+              - Effect: Allow
+                Action:
+                  - 'ecr:GetAuthorizationToken'
+                  - 'ecr:BatchCheckLayerAvailability'
+                  - 'ecr:GetDownloadUrlForLayer'
+                  - 'ecr:BatchGetImage'
+                  - 'logs:CreateLogStream'
+                  - 'logs:PutLogEvents'
+                  - 'logs:DescribeLogStreams'
+                  - 'logs:GetLogEvents'
+                  - 'cloudwatch:PutMetricData'
+                Resource: '*'
+  TUFRepoCanaryTaskEventRole:
+    Type: 'AWS::IAM::Role'
+    Properties:
+      RoleName: TUFRepoCanaryTaskEventRole
+      AssumeRolePolicyDocument:
+        Statement:
+          - Effect: Allow
+            Principal:
+              Service: events.amazonaws.com
+            Action:
+              - 'sts:AssumeRole'
+      Policies:
+        - PolicyName: AmazonEC2ContainerServiceEventsRole
+          PolicyDocument:
+            Statement:
+              - Effect: Allow
+                Action:
+                  - 'ecs:RunTask'
+                  - 'iam:PassRole'
+                Resource: '*'
+  TUFRepoCanaryFailedInvocationAlarm:
+    Type: 'AWS::CloudWatch::Alarm'
+    Properties:
+      AlarmName: TUF Repo Canary Invocation Failure
+      AlarmDescription: 'TUF Repo Canary task could not be invoked'
+      Namespace: AWS/Events
+      MetricName: FailedInvocations
+      Dimensions:
+        - Name: RuleName
+          Value: !Ref TUFRepoCanaryScheduledTask
+      Period: 600
+      Statistic: Average
+      Threshold: 0
+      TreatMissingData: notBreaching
+      ComparisonOperator: GreaterThanThreshold
+      EvaluationPeriods: 1
+      ActionsEnabled: true
+      AlarmActions:
+        - !Ref TUFRepoCanarySNSNotificationTopic
+  TUFRepoCanaryScheduledTask:
+    Type: 'AWS::Events::Rule'
+    Properties:
+      Description: !Sub 'Schedules ${TaskName} task to run every hour at 00 minutes'
+      ScheduleExpression: cron(0/10 * * * ? *)
+      State: ENABLED
+      Targets:
+        - Id: !Sub '${TaskName}-Fargate-Task'
+          RoleArn: !GetAtt TUFRepoCanaryTaskEventRole.Arn
+          EcsParameters:
+            TaskDefinitionArn: !Ref TUFRepoCanaryTask
+            TaskCount: 1
+            LaunchType: FARGATE
+            PlatformVersion: LATEST
+            NetworkConfiguration:
+              AwsVpcConfiguration:
+                AssignPublicIp: ENABLED
+                SecurityGroups:
+                  - !Ref VPCSecurityGroup
+                Subnets:
+                  - !Ref VPCSubnet
+          Arn: !GetAtt ECSCluster.Arn
+  TUFRepoCanaryFailedAlarm:
+    Type: 'AWS::CloudWatch::Alarm'
+    Properties:
+      AlarmName: TUF Repo Validation Failure
+      AlarmDescription: 'TUF Repo Canary task exited non-zero (indicating TUF Repo validation failure)'
+      Namespace: AWS/Events
+      MetricName: TriggeredRules
+      Dimensions:
+        - Name: RuleName
+          Value: !Ref TUFRepoCanaryFailedRule
+      Period: 600
+      Statistic: Average
+      Threshold: 0
+      TreatMissingData: notBreaching
+      ComparisonOperator: GreaterThanThreshold
+      EvaluationPeriods: 1
+      ActionsEnabled: true
+      AlarmActions:
+        - !Ref TUFRepoCanarySNSNotificationTopic
+  TUFRepoCanaryFailedRule:
+    Type: 'AWS::Events::Rule'
+    Properties:
+      Description: 'TUF repository validation failure'
+      Name: 'repo-canary-nonzero-exit-code'
+      EventPattern: !Sub '{"source": ["aws.ecs"],"detail-type": ["ECS Task State Change"],"detail": {"containers": {"name": ["${TaskName}"],"exitCode":[1,64,65,66,67,68,69,70,71,72,73],"lastStatus": ["STOPPED"]}}}'
+      Targets:
+        - Arn: !Join
+            - ":"
+            - - "arn:aws:logs"
+              - !Ref 'AWS::Region'
+              - !Ref 'AWS::AccountId'
+              - 'log-group'
+              - !Ref RepoValidationFailureLogGroup
+          Id: 'tuf-repo-validation-failure'
+  TUFRepoCanaryFailedStartAlarm:
+    Type: 'AWS::CloudWatch::Alarm'
+    Properties:
+      AlarmName: TUF Repo Canary Task Start Failure
+      AlarmDescription: 'TUF Repo Canary task failed to start'
+      Namespace: AWS/Events
+      MetricName: TriggeredRules
+      Dimensions:
+        - Name: RuleName
+          Value: !Ref TUFRepoCanaryFailedStartRule
+      Period: 600
+      Statistic: Average
+      Threshold: 0
+      TreatMissingData: notBreaching
+      ComparisonOperator: GreaterThanThreshold
+      EvaluationPeriods: 1
+      ActionsEnabled: true
+      AlarmActions:
+        - !Ref TUFRepoCanarySNSNotificationTopic
+  TUFRepoCanaryFailedStartRule:
+    Type: 'AWS::Events::Rule'
+    Properties:
+      Description: 'TUF Repo Canary fail to start'
+      Name: 'repo-canary-failed-to-start'
+      EventPattern: !Sub '{"source": ["aws.ecs"],"detail-type": ["ECS Task State Change"],"detail": {"containers": {"name": ["${TaskName}"],"lastStatus": ["STOPPED"]},"stoppedReason":["Task failed to start"]}}'
+      Targets:
+        - Arn: !Join
+            - ":"
+            - - "arn:aws:logs"
+              - !Ref 'AWS::Region'
+              - !Ref 'AWS::AccountId'
+              - 'log-group'
+              - !Ref FailedStartLogGroup
+          Id: !Sub '${TaskName}-failed-start'