From fae07463825032970b0cbc8647f13c8bd1feb6ef Mon Sep 17 00:00:00 2001
From: Anna <git@anna.lgbt>
Date: Wed, 30 Aug 2023 03:11:48 -0400
Subject: [PATCH] chore: initial commit

---
 .gitignore  |    1 +
 Cargo.lock  | 2012 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   22 +
 LICENCE     |  287 ++++++++
 README.md   |    9 +
 src/main.rs |  434 +++++++++++
 6 files changed, 2765 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 LICENCE
 create mode 100644 README.md
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..54aa2d5
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+++ b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a0912b4
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "git-vain"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1"
+chrono = "0.4"
+clap = { version = "4", features = ["derive"] }
+data-encoding = "2"
+flate2 = "1"
+git2 = "0.17"
+gpgme = "0.11"
+indicatif = "0.17"
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+itoa = "1"
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+rand = "0.8"
+sequoia-openpgp = { git = "https://gitlab.com/sequoia-pgp/sequoia" }
+sha1 = "0.10"
diff --git a/LICENCE b/LICENCE
new file mode 100644
index 0000000..4153cd3
--- /dev/null
+++ b/LICENCE
@@ -0,0 +1,287 @@
+                      EUROPEAN UNION PUBLIC LICENCE v. 1.2
+                      EUPL © the European Union 2007, 2016
+
+This European Union Public Licence (the ‘EUPL’) applies to the Work (as defined
+below) which is provided under the terms of this Licence. Any use of the Work,
+other than as authorised under this Licence is prohibited (to the extent such
+use is covered by a right of the copyright holder of the Work).
+
+The Work is provided under the terms of this Licence when the Licensor (as
+defined below) has placed the following notice immediately following the
+copyright notice for the Work:
+
+        Licensed under the EUPL
+
+or has expressed by any other means his willingness to license under the EUPL.
+
+1. Definitions
+
+In this Licence, the following terms have the following meaning:
+
+- ‘The Licence’: this Licence.
+
+- ‘The Original Work’: the work or software distributed or communicated by the
+  Licensor under this Licence, available as Source Code and also as Executable
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+- ‘Derivative Works’: the works or software that could be created by the
+  Licensee, based upon the Original Work or modifications thereof. This Licence
+  does not define the extent of modification or dependence on the Original Work
+  required in order to classify a work as a Derivative Work; this extent is
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+- ‘The Work’: the Original Work or its Derivative Works.
+
+- ‘The Source Code’: the human-readable form of the Work which is the most
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+
+- ‘The Executable Code’: any code which has generally been compiled and which is
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+- ‘The Licensor’: the natural or legal person that distributes or communicates
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+  the Work or copies thereof to the public and perform publicly, as the case may
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+4. Limitations on copyright
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+Nothing in this Licence is intended to deprive the Licensee of the benefits from
+any exception or limitation to the exclusive rights of the rights owners in the
+Work, of the exhaustion of those rights or of other applicable limitations
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+5. Obligations of the Licensee
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+The grant of the rights mentioned above is subject to some restrictions and
+obligations imposed on the Licensee. Those obligations are the following:
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+Attribution right: The Licensee shall keep intact all copyright, patent or
+trademarks notices and all notices that refer to the Licence and to the
+disclaimer of warranties. The Licensee must include a copy of such notices and a
+copy of the Licence with every copy of the Work he/she distributes or
+communicates. The Licensee must cause any Derivative Work to carry prominent
+notices stating that the Work has been modified and the date of modification.
+
+Copyleft clause: If the Licensee distributes or communicates copies of the
+Original Works or Derivative Works, this Distribution or Communication will be
+done under the terms of this Licence or of a later version of this Licence
+unless the Original Work is expressly distributed only under this version of the
+Licence — for example by communicating ‘EUPL v. 1.2 only’. The Licensee
+(becoming Licensor) cannot offer or impose any additional terms or conditions on
+the Work or Derivative Work that alter or restrict the terms of the Licence.
+
+Compatibility clause: If the Licensee Distributes or Communicates Derivative
+Works or copies thereof based upon both the Work and another work licensed under
+a Compatible Licence, this Distribution or Communication can be done under the
+terms of this Compatible Licence. For the sake of this clause, ‘Compatible
+Licence’ refers to the licences listed in the appendix attached to this Licence.
+Should the Licensee's obligations under the Compatible Licence conflict with
+his/her obligations under this Licence, the obligations of the Compatible
+Licence shall prevail.
+
+Provision of Source Code: When distributing or communicating copies of the Work,
+the Licensee will provide a machine-readable copy of the Source Code or indicate
+a repository where this Source will be easily and freely available for as long
+as the Licensee continues to distribute or communicate the Work.
+
+Legal Protection: This Licence does not grant permission to use the trade names,
+trademarks, service marks, or names of the Licensor, except as required for
+reasonable and customary use in describing the origin of the Work and
+reproducing the content of the copyright notice.
+
+6. Chain of Authorship
+
+The original Licensor warrants that the copyright in the Original Work granted
+hereunder is owned by him/her or licensed to him/her and that he/she has the
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+
+Each Contributor warrants that the copyright in the modifications he/she brings
+to the Work are owned by him/her or licensed to him/her and that he/she has the
+power and authority to grant the Licence.
+
+Each time You accept the Licence, the original Licensor and subsequent
+Contributors grant You a licence to their contributions to the Work, under the
+terms of this Licence.
+
+7. Disclaimer of Warranty
+
+The Work is a work in progress, which is continuously improved by numerous
+Contributors. It is not a finished work and may therefore contain defects or
+‘bugs’ inherent to this type of development.
+
+For the above reason, the Work is provided under the Licence on an ‘as is’ basis
+and without warranties of any kind concerning the Work, including without
+limitation merchantability, fitness for a particular purpose, absence of defects
+or errors, accuracy, non-infringement of intellectual property rights other than
+copyright as stated in Article 6 of this Licence.
+
+This disclaimer of warranty is an essential part of the Licence and a condition
+for the grant of any rights to the Work.
+
+8. Disclaimer of Liability
+
+Except in the cases of wilful misconduct or damages directly caused to natural
+persons, the Licensor will in no event be liable for any direct or indirect,
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+of the Work, including without limitation, damages for loss of goodwill, work
+stoppage, computer failure or malfunction, loss of data or any commercial
+damage, even if the Licensor has been advised of the possibility of such damage.
+However, the Licensor will be liable under statutory product liability laws as
+far such laws apply to the Work.
+
+9. Additional agreements
+
+While distributing the Work, You may choose to conclude an additional agreement,
+defining obligations or services consistent with this Licence. However, if
+accepting obligations, You may act only on your own behalf and on your sole
+responsibility, not on behalf of the original Licensor or any other Contributor,
+and only if You agree to indemnify, defend, and hold each Contributor harmless
+for any liability incurred by, or claims asserted against such Contributor by
+the fact You have accepted any warranty or additional liability.
+
+10. Acceptance of the Licence
+
+The provisions of this Licence can be accepted by clicking on an icon ‘I agree’
+placed under the bottom of a window displaying the text of this Licence or by
+affirming consent in any other similar way, in accordance with the rules of
+applicable law. Clicking on that icon indicates your clear and irrevocable
+acceptance of this Licence and all of its terms and conditions.
+
+Similarly, you irrevocably accept this Licence and all of its terms and
+conditions by exercising any rights granted to You by Article 2 of this Licence,
+such as the use of the Work, the creation by You of a Derivative Work or the
+Distribution or Communication by You of the Work or copies thereof.
+
+11. Information to the public
+
+In case of any Distribution or Communication of the Work by means of electronic
+communication by You (for example, by offering to download the Work from a
+remote location) the distribution channel or media (for example, a website) must
+at least provide to the public the information requested by the applicable law
+regarding the Licensor, the Licence and the way it may be accessible, concluded,
+stored and reproduced by the Licensee.
+
+12. Termination of the Licence
+
+The Licence and the rights granted hereunder will terminate automatically upon
+any breach by the Licensee of the terms of the Licence.
+
+Such a termination will not terminate the licences of any person who has
+received the Work from the Licensee under the Licence, provided such persons
+remain in full compliance with the Licence.
+
+13. Miscellaneous
+
+Without prejudice of Article 9 above, the Licence represents the complete
+agreement between the Parties as to the Work.
+
+If any provision of the Licence is invalid or unenforceable under applicable
+law, this will not affect the validity or enforceability of the Licence as a
+whole. Such provision will be construed or reformed so as necessary to make it
+valid and enforceable.
+
+The European Commission may publish other linguistic versions or new versions of
+this Licence or updated versions of the Appendix, so far this is required and
+reasonable, without reducing the scope of the rights granted by the Licence. New
+versions of the Licence will be published with a unique version number.
+
+All linguistic versions of this Licence, approved by the European Commission,
+have identical value. Parties can take advantage of the linguistic version of
+their choice.
+
+14. Jurisdiction
+
+Without prejudice to specific agreement between parties,
+
+- any litigation resulting from the interpretation of this License, arising
+  between the European Union institutions, bodies, offices or agencies, as a
+  Licensor, and any Licensee, will be subject to the jurisdiction of the Court
+  of Justice of the European Union, as laid down in article 272 of the Treaty on
+  the Functioning of the European Union,
+
+- any litigation arising between other parties and resulting from the
+  interpretation of this License, will be subject to the exclusive jurisdiction
+  of the competent court where the Licensor resides or conducts its primary
+  business.
+
+15. Applicable Law
+
+Without prejudice to specific agreement between parties,
+
+- this Licence shall be governed by the law of the European Union Member State
+  where the Licensor has his seat, resides or has his registered office,
+
+- this licence shall be governed by Belgian law if the Licensor has no seat,
+  residence or registered office inside a European Union Member State.
+
+Appendix
+
+‘Compatible Licences’ according to Article 5 EUPL are:
+
+- GNU General Public License (GPL) v. 2, v. 3
+- GNU Affero General Public License (AGPL) v. 3
+- Open Software License (OSL) v. 2.1, v. 3.0
+- Eclipse Public License (EPL) v. 1.0
+- CeCILL v. 2.0, v. 2.1
+- Mozilla Public Licence (MPL) v. 2
+- GNU Lesser General Public Licence (LGPL) v. 2.1, v. 3
+- Creative Commons Attribution-ShareAlike v. 3.0 Unported (CC BY-SA 3.0) for
+  works other than software
+- European Union Public Licence (EUPL) v. 1.1, v. 1.2
+- Québec Free and Open-Source Licence — Reciprocity (LiLiQ-R) or Strong
+  Reciprocity (LiLiQ-R+).
+
+The European Commission may update this Appendix to later versions of the above
+licences without producing a new version of the EUPL, as long as they provide
+the rights granted in Article 2 of this Licence and protect the covered Source
+Code from exclusive appropriation.
+
+All other changes or additions to this Appendix require the production of a new
+EUPL version.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..57f497e
--- /dev/null
+++ b/README.md
@@ -0,0 +1,9 @@
+# git-vain
+
+Generate vanity commit hashes quickly.
+
+Supports:
+- pgp signing (via gpg-agent or sequoia)
+- arbitrary commits from history
+- various methods (date increment/decrement, random text, counter text)
+- multithreading
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..2905c5a
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,434 @@
+use std::borrow::Cow;
+use std::fs::File;
+use std::io::Write;
+use std::process::Command;
+use std::sync::Arc;
+use std::sync::atomic::{AtomicBool, AtomicI64, AtomicUsize, Ordering};
+
+use anyhow::{Context as _, Result};
+use clap::{Parser, ValueEnum};
+use flate2::Compression;
+use flate2::write::ZlibEncoder;
+use git2::Repository;
+use gpgme::{Context, Protocol, SignMode};
+use indicatif::ProgressStyle;
+use openpgp::{
+    packet::prelude::*,
+    parse::Parse,
+    serialize::{
+        Serialize,
+        stream::{Armorer, Message},
+    },
+    types::*,
+};
+use rand::Rng;
+use sequoia_openpgp as openpgp;
+use sequoia_openpgp::policy::StandardPolicy;
+use sha1::{Digest, Sha1};
+
+/// A vanity commit hash generator that's fast, works with PGP signing, and can
+/// be used on arbitrary commits (not just HEAD).
+///
+/// This works by decrementing the commit time one second and recalculating the
+/// hash until a hash matching your selected prefix is found.
+///
+/// If using PGP signing, the timestamp remains unchanged. Every PGP signature is different, even on
+/// the same data, so decrementing the timestamp is no longer required.
+/// Providing a key file is orders of magnitude faster than providing a key ID,
+/// since using a key ID goes through gpg-agent, which is very slow.
+#[derive(Parser)]
+struct Cli {
+    /// The commit to replace with a vanity hash. Defaults to HEAD.
+    #[arg(short, long)]
+    commit: Option<String>,
+
+    /// The key ID to use for signing.
+    ///
+    /// This is very slow compared to providing a key file, but this will use
+    /// gpg-agent.
+    #[arg(short = 'k', long)]
+    signing_key: Option<String>,
+
+    /// Path to an export secret key to use for signing. This is orders of
+    /// magnitude faster than providing a key ID, but it will not use gpg-agent
+    /// and requires you to provide your password to git-vain.
+    #[arg(short = 'K', long)]
+    signing_key_file: Option<String>,
+
+    /// The number of threads to use when searching for a matching hash.
+    /// Defaults to 0, and 0 will use the number of logical cores on your
+    /// system.
+    #[arg(short, long)]
+    threads: Option<usize>,
+
+    /// The method of changing the commit to generate a new hash. Defaults to
+    /// decrement.
+    ///
+    /// Note that this has no effect if a signing key is provided.
+    ///
+    /// - decrement will decrease the commit date by one second for each attempt
+    ///
+    /// - increment will increase the commit date by one second for each attempt
+    ///
+    /// - random will append a random string to the commit message for each
+    ///   attempt
+    ///
+    /// - counter will append an increasing number to the commit message for
+    ///   each attempt
+    #[arg(short, long, value_enum, default_value_t = Method::Decrement)]
+    method: Method,
+
+    /// Force generating a new vanity hash for commits that already start with
+    /// the requested prefix.
+    #[arg(short, long)]
+    force: bool,
+
+    /// The vanity commit hash prefix you desire.
+    prefix: String,
+}
+
+#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, ValueEnum)]
+enum Method {
+    Decrement,
+    Increment,
+    Random,
+    Counter,
+}
+
+fn main() -> Result<()> {
+    let args = Cli::parse();
+
+    if args.signing_key.is_some() && args.signing_key_file.is_some() {
+        anyhow::bail!("specify a key id or key file, not both");
+    }
+
+    let prefix = args.prefix.to_lowercase();
+    let commit = args.commit.as_deref().unwrap_or("HEAD");
+    let threads = match args.threads.unwrap_or(0) {
+        0 => num_cpus::get(),
+        x => x,
+    };
+
+    let mut seq_key = None;
+    if let Some(path) = &args.signing_key_file {
+        let key = openpgp::Cert::from_file(path)
+            .context("failed to read key from file")?;
+
+        let mut keys = Vec::new();
+        let p = &StandardPolicy::new();
+        for key in key
+            .keys().with_policy(p, None).alive().revoked(false).for_signing().secret()
+            .map(|ka| ka.key())
+        {
+            let key = if key.has_unencrypted_secret() {
+                key.clone().into_keypair()
+                    .context("failed to convert unencrypted key into keypair")?
+            } else {
+                let mut first = true;
+                loop {
+                    let mut prompt = inquire::Password::new("Key password: ");
+                    if !first {
+                        prompt = prompt.with_help_message("Failed to decrypt the secret key with that password");
+                    }
+
+                    let password = prompt.without_confirmation()
+                        .prompt()?;
+                    let decrypted = key.clone()
+                        .decrypt_secret(&password.trim().into())
+                        .context("failed to decrypt secret key");
+                    first = false;
+
+                    match decrypted {
+                        Ok(d) => break d.into_keypair()
+                            .context("failed to convert decrypted key into keypair")?,
+                        Err(_) => continue,
+                    }
+                }
+            };
+
+            keys.push(key);
+        }
+
+        if keys.is_empty() {
+            anyhow::bail!("no suitable signing keys in key file");
+        }
+
+        seq_key = keys.pop();
+    }
+
+    // first open the repo and find the commit pointed to by HEAD
+    let repo = Repository::open(".")
+        .context("no git repository in this directory")?;
+
+    let obj = repo.revparse_single(commit)
+        .context("could not find reference")?;
+    let commit = repo.find_commit(obj.id())
+        .context("could not resolve reference to a commit")?;
+
+    if !args.force && commit.id().to_string().starts_with(&prefix) {
+        anyhow::bail!("commit already starts with prefix");
+    }
+
+    // grab the header of the commit and the message
+    let raw_header = commit.raw_header()
+        .context("commit had an invalid header")?;
+
+    let mut header_lines = Vec::default();
+    // strip out the signature lines
+    {
+        let mut in_sig = false;
+        for line in raw_header.split('\n') {
+            if line.starts_with("gpgsig ") {
+                in_sig = true;
+                continue;
+            }
+
+            if in_sig {
+                if line.starts_with(' ') {
+                    continue;
+                } else {
+                    in_sig = false;
+                }
+            }
+
+            header_lines.push(line.to_string());
+        }
+    }
+
+    let message = commit.message_raw()
+        .context("commit had an invalid message")?
+        .to_string();
+
+    // find the author and committer
+    let author_idx = header_lines.iter()
+        .position(|line| line.starts_with("author "))
+        .context("missing author")?;
+    let committer_idx = header_lines.iter()
+        .position(|line| line.starts_with("committer "))
+        .context("missing committer")?;
+
+    // split the lines by spaces
+    let author_parts: Vec<_> = header_lines[author_idx].split(' ')
+        .map(ToOwned::to_owned)
+        .collect();
+    let committer_parts: Vec<_> = header_lines[committer_idx].split(' ')
+        .map(ToOwned::to_owned)
+        .collect();
+    // get the timestamp
+    let timestamp = author_parts.get(author_parts.len() - 2)
+        .context("missing timestamp")?
+        .parse::<i64>()
+        .context("invalid timestamp")?;
+    // let original = timestamp;
+
+    let author_len = author_parts.len();
+    let committer_len = committer_parts.len();
+
+    let counter = Arc::new(AtomicUsize::default());
+    let found = Arc::new(AtomicBool::new(false));
+    let timestamp = Arc::new(AtomicI64::new(timestamp));
+    let (commit_tx, commit_rx) = std::sync::mpsc::channel();
+
+    let bar = indicatif::ProgressBar::new_spinner()
+        .with_style(ProgressStyle::with_template("{spinner} {elapsed} - {human_len} hashes ({per_sec})")?);
+
+    for _ in 0..threads {
+        let bar = bar.clone();
+        let mut seq_key = seq_key.clone();
+        let key = args.signing_key.clone();
+        let counter = Arc::clone(&counter);
+        let found = Arc::clone(&found);
+        let timestamp = Arc::clone(&timestamp);
+        let message = message.clone();
+        let prefix = prefix.clone();
+        let mut author_parts = author_parts.clone();
+        let mut committer_parts = committer_parts.clone();
+        let mut header_lines = header_lines.clone();
+        let method = args.method;
+        let commit_tx = commit_tx.clone();
+
+        std::thread::spawn(move || {
+            let mut gpg = match key {
+                Some(key) => {
+                    let mut ctx = Context::from_protocol(Protocol::OpenPgp)
+                        .context("could not create openpgp context")
+                        .unwrap(); // FIXME
+                    ctx.set_armor(true);
+                    let key = ctx.get_secret_key(key)
+                        .context("could not find secret key")
+                        .unwrap(); // FIXME
+                    ctx.add_signer(&key)
+                        .context("could not add signer")
+                        .unwrap(); // FIXME
+                    Some((ctx, key))
+                }
+                None => None,
+            };
+
+            let mut sha1 = Sha1::default();
+            loop {
+                if found.load(Ordering::SeqCst) {
+                    break;
+                }
+
+                let timestamp = if gpg.is_some() || seq_key.is_some() {
+                    timestamp.load(Ordering::SeqCst)
+                } else {
+                    match method {
+                        Method::Decrement => timestamp.fetch_sub(1, Ordering::SeqCst) - 1,
+                        Method::Increment => timestamp.fetch_add(1, Ordering::SeqCst) + 1,
+                        _ => timestamp.load(Ordering::SeqCst),
+                    }
+                };
+
+                let mut buffer = itoa::Buffer::new();
+                let append = if gpg.is_some() || seq_key.is_some() {
+                    None
+                } else {
+                    match method {
+                        Method::Random => {
+                            let mut bytes = [0; 16];
+                            rand::thread_rng().fill(&mut bytes);
+                            Some(data_encoding::HEXLOWER.encode(&bytes))
+                        }
+                        Method::Counter => {
+                            let count = counter.fetch_add(1, Ordering::SeqCst) + 1;
+                            Some(buffer.format(count).to_owned())
+                        }
+                        _ => None,
+                    }
+                };
+
+                author_parts[author_len - 2] = buffer.format(timestamp).to_owned();
+                committer_parts[committer_len - 2] = buffer.format(timestamp).to_owned();
+
+                header_lines[author_idx] = author_parts.join(" ");
+                header_lines[committer_idx] = committer_parts.join(" ");
+
+                let mut header = header_lines.join("\n");
+
+                if let Some((ctx, _)) = &mut gpg {
+                    let to_sign = format!("{header}\n{message}");
+                    let mut output = Vec::new();
+                    ctx.sign(SignMode::Detached, to_sign, &mut output)
+                        .context("could not sign commit")
+                        .unwrap(); // FIXME
+
+                    let sig = String::from_utf8(output)
+                        .context("signature was not utf-8")
+                        .unwrap(); // FIXME
+                    header.push_str("gpgsig");
+                    for line in sig.trim().split('\n') {
+                        header.push(' ');
+                        header.push_str(line);
+                        header.push('\n');
+                    }
+                } else if let Some(key) = &mut seq_key {
+                    let to_sign = format!("{header}\n{message}");
+                    let sig = SignatureBuilder::new(SignatureType::Binary)
+                        .sign_message(key, to_sign)
+                        .context("failed to sign message")
+                        .unwrap(); // FIXME
+
+                    let mut output = Vec::new();
+                    let message = Message::new(&mut output);
+                    let mut message = Armorer::new(message)
+                        .kind(openpgp::armor::Kind::Signature)
+                        .build()
+                        .context("failed to build pgp message")
+                        .unwrap(); // FIXME
+                    Packet::from(sig)
+                        .serialize(&mut message)
+                        .context("failed to serialise packet")
+                        .unwrap(); // FIXME
+                    message.finalize()
+                        .context("could not finalise message")
+                        .unwrap(); // FIXME
+
+                    let sig = String::from_utf8(output)
+                        .context("signature was not utf-8")
+                        .unwrap(); // FIXME
+                    header.push_str("gpgsig");
+                    for line in sig.trim().split('\n') {
+                        header.push(' ');
+                        header.push_str(line);
+                        header.push('\n');
+                    }
+                }
+
+                let message = match append {
+                    Some(append) => Cow::from(format!("{message}\n{append}\n")),
+                    None => Cow::from(&message),
+                };
+
+                let total = format!("{header}\n{message}");
+                let raw_commit = format!("commit {}\0", total.len());
+                sha1.update(&raw_commit);
+                sha1.update(&total);
+                let hash = sha1.finalize_reset();
+                let hash = data_encoding::HEXLOWER.encode(&hash);
+
+                bar.inc(1);
+                if hash.starts_with(&prefix) {
+                    found.store(true, Ordering::SeqCst);
+                    commit_tx.send((hash, format!("{raw_commit}{total}"))).unwrap();
+                    break;
+                }
+            }
+        });
+    }
+
+    let (hash, new_commit_data) = commit_rx.recv().unwrap();
+    bar.finish_and_clear();
+    let path = repo.path();
+    // let old_commit_id = commit.id().to_string();
+
+    // let old_path = path.join("objects")
+    //     .join(&old_commit_id[..2])
+    //     .join(&old_commit_id[2..]);
+    let new_path = path.join("objects")
+        .join(&hash[..2])
+        .join(&hash[2..]);
+
+    {
+        std::fs::create_dir_all(new_path.parent().unwrap())
+            .context("could not create directory")?;
+        let file = File::create(new_path)
+            .context("could not create commit file")?;
+        let mut compressor = ZlibEncoder::new(file, Compression::fast());
+        compressor.write_all(new_commit_data.as_bytes())
+            .context("could not write commit")?;
+    }
+
+    // let new_commit = repo.find_annotated_commit(Oid::from_str(&hash)?)
+    //     .context("cannot get new commit")?;
+    // let new_new_commit = repo.find_commit(Oid::from_str(&hash)?)
+    //     .context("cannot get new commit (2)")?;
+    // let old_commit = repo.revparse_single(&format!("{}~1", commit.id()))
+    //     .context("cannot find old commit")?;
+    // let old_commit = repo.find_annotated_commit(old_commit.id())
+    //     .context("cannot get new commit")?;
+    // let mut rebase = repo.rebase(None, Some(&old_commit), Some(&new_commit), None)?;
+    // while let Some(op) = rebase.next() {
+    //     op?;
+    //     rebase.commit(None, &new_new_commit.committer(), None)?;
+    // }
+    // rebase.finish(None)?;
+    let previous = format!("{}~1", commit.id());
+    let is_root = repo.revparse_single(&previous).is_err();
+    let final_arg = if is_root {
+        "--root"
+    } else {
+        &*previous
+    };
+
+    Command::new("git")
+        .args(["rebase", "--onto", &hash, final_arg])
+        .spawn()
+        .context("could not spawn rebase command")?
+        .wait()
+        .context("rebase command failed")?;
+    eprintln!("{hash}");
+
+    Ok(())
+}