add workaround for amending & rewording signed commits

asyncgit/src/error.rs

@@ -92,6 +92,18 @@ pub enum Error {
 	///
 	#[error("sign error: {0}")]
 	Sign(#[from] crate::sync::sign::SignError),
+
+	///
+	#[error("amend error: config commit.gpgsign=true detected.\ngpg signing is not supported for amending non-last commits")]
+	SignAmendNonLastCommit,
+
+	///
+	#[error("reword error: config commit.gpgsign=true detected.\ngpg signing is not supported for rewording non-last commits")]
+	SignRewordNonLastCommit,
+
+	///
+	#[error("reword error: config commit.gpgsign=true detected.\ngpg signing is not supported for rewording commits with staged changes\ntry unstaging or stashing your changes")]
+	SignRewordLastCommitStaged,
 }
 
 ///

asyncgit/src/sync/commit.rs

@@ -1,7 +1,7 @@
 use super::{CommitId, RepoPath};
 use crate::sync::sign::{SignBuilder, SignError};
 use crate::{
-	error::Result,
+	error::{Error, Result},
 	sync::{repository::repo, utils::get_head_repo},
 };
 use git2::{ErrorCode, ObjectType, Repository, Signature};
@@ -16,12 +16,27 @@ pub fn amend(
 	scope_time!("amend");
 
 	let repo = repo(repo_path)?;
+	let config = repo.config()?;
+
 	let commit = repo.find_commit(id.into())?;
 
 	let mut index = repo.index()?;
 	let tree_id = index.write_tree()?;
 	let tree = repo.find_tree(tree_id)?;
 
+	if config.get_bool("commit.gpgsign").unwrap_or(false) {
+		// HACK: we undo the last commit and create a new one
+		use crate::sync::utils::undo_last_commit;
+
+		let head = get_head_repo(&repo)?;
+		if head == commit.id().into() {
+			undo_last_commit(repo_path)?;
+			return self::commit(repo_path, msg);
+		}
+
+		return Err(Error::SignAmendNonLastCommit);
+	}
+
 	let new_id = commit.amend(
 		Some("HEAD"),
 		None,

asyncgit/src/sync/reword.rs

@@ -3,7 +3,7 @@ use git2::{Oid, RebaseOptions, Repository};
 use super::{
 	commit::signature_allow_undefined_name,
 	repo,
-	utils::{bytes2string, get_head_refname},
+	utils::{bytes2string, get_head_refname, get_head_repo},
 	CommitId, RepoPath,
 };
 use crate::error::{Error, Result};
@@ -15,6 +15,32 @@ pub fn reword(
 	message: &str,
 ) -> Result<CommitId> {
 	let repo = repo(repo_path)?;
+	let config = repo.config()?;
+
+	if config.get_bool("commit.gpgsign").unwrap_or(false) {
+		// HACK: we undo the last commit and create a new one
+		use crate::sync::utils::undo_last_commit;
+
+		let head = get_head_repo(&repo)?;
+		if head == commit {
+			// Check if there are any staged changes
+			let parent = repo.find_commit(head.into())?;
+			let tree = parent.tree()?;
+			if repo
+				.diff_tree_to_index(Some(&tree), None, None)?
+				.deltas()
+				.len() == 0
+			{
+				undo_last_commit(repo_path)?;
+				return super::commit(repo_path, message);
+			}
+
+			return Err(Error::SignRewordLastCommitStaged);
+		}
+
+		return Err(Error::SignRewordNonLastCommit);
+	}
+
 	let cur_branch_ref = get_head_refname(&repo)?;
 
 	match reword_internal(&repo, commit.get_oid(), message) {