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--- /dev/null
+++ b/COPYING
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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "777182bc735b6424e1a57516d35ed72cb8019d85c8c9bf536dccb3445c1a2f7d"
+dependencies = [
+ "same-file",
+ "winapi",
+ "winapi-util",
+]
+
+[[package]]
+name = "wasi"
+version = "0.9.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..4b8e285
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "cargo-dump-git-sources"
+version = "0.1.0"
+authors = ["Alyssa Ross <hi@alyssa.is>"]
+edition = "2018"
+
+[dependencies]
+cargo = "0.49.0"
+toml = "0.5.7"
+serde = "1.0.117"
+serde_json = "1.0.60"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..dd4a56c
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,89 @@
+use std::collections::BTreeSet;
+use std::env::args_os;
+use std::fs::File;
+use std::io::Read;
+use std::os::unix::prelude::*;
+use std::process::{Command, Stdio};
+
+use cargo::core::SourceId;
+use serde::{Deserialize, Serialize};
+use serde_json;
+use toml::value::Table as TomlTable;
+
+#[derive(Debug, Serialize)]
+struct Output {
+    git: BTreeSet<PrefetchGit>,
+}
+
+#[derive(Debug, Serialize, Deserialize, Ord, PartialOrd, Eq, PartialEq)]
+struct PrefetchGit {
+    url: String,
+    rev: String,
+    sha256: String,
+    #[serde(rename = "fetchSubmodules")]
+    fetch_submodules: bool,
+    #[serde(rename = "deepClone")]
+    deep_clone: bool,
+    #[serde(rename = "leaveDotGit")]
+    leave_dot_git: bool,
+}
+
+fn main() {
+    let lockfile_path = args_os().skip(1).next().expect("missing lockfile path");
+
+    let mut lockfile_bytes = vec![];
+    let mut lockfile_fd = File::open(lockfile_path).expect("lockfile does not exist");
+    lockfile_fd
+        .read_to_end(&mut lockfile_bytes)
+        .expect("failed to read lockfile");
+
+    let lockfile: TomlTable = toml::from_slice(&lockfile_bytes).expect("can't parse lockfile");
+    let packages = lockfile
+        .get("package")
+        .expect("missing 'package' key")
+        .as_array()
+        .expect("package is not array");
+
+    let sources: BTreeSet<_> = packages
+        .into_iter()
+        .flat_map(|package| package.get("source"))
+        .map(|source| {
+            SourceId::from_url(source.as_str().expect("source not string"))
+                .expect("source not string")
+        })
+        .filter(|source| source.is_git())
+        .collect();
+
+    let output: BTreeSet<PrefetchGit> = sources
+        .into_iter()
+        .map(|source| {
+            let output = Command::new("nix-prefetch-git")
+                .arg("--fetch-submodules")
+                .arg(source.url().as_str())
+                .arg(source.precise().expect("missing precise in source URL"))
+                .stderr(Stdio::inherit())
+                .output()
+                .expect("failed to spawn nix-prefetch-git");
+            if !output.status.success() {
+                if let Some(code) = output.status.code() {
+                    panic!("nix-prefetch-git exited with status {}", code);
+                } else {
+                    panic!(
+                        "nix-prefetch-git exited with signal {}",
+                        output.status.signal().unwrap()
+                    );
+                }
+            }
+
+            // FIXME: no need to read stdout into a buffer.
+
+            serde_json::from_slice(&output.stdout).expect("failed to parse nix-prefetch-git output")
+        })
+        .collect();
+
+    println!(
+        "{}",
+        toml::ser::to_string_pretty(&Output { git: output })
+            .expect("failed to serialize nix-prefetch-git output as TOML")
+    );
+}