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//! File create/append/prepend/delete/rename for the tx engine.
use super::{TxState, read_file_content};
use crate::plan::Operation;
// op_to_doc_mutation moved to plan.rs as the single source of truth for
// Operation::Doc* -> DocMutation conversion (see #901).
pub(crate) fn execute_file_op(op: &Operation, tx: &mut TxState<'_>) -> anyhow::Result<usize> {
match op {
Operation::FileAppend { path, content } => {
let file_path = tx.cwd.join(path);
if file_path.exists() && !file_path.is_file() {
return Err(crate::exit::InvalidInputError {
msg: format!("target is not a file: {path}"),
}
.into());
}
if tx.deletions.contains(&file_path) {
return Err(std::io::Error::new(
std::io::ErrorKind::NotFound,
format!("file was deleted earlier in this transaction: {path}"),
)
.into());
}
if !file_path.exists() && !tx.pending.contains_key(&file_path) {
return Err(std::io::Error::new(
std::io::ErrorKind::NotFound,
format!("file does not exist: {path}"),
)
.into());
}
// On-disk binary only (in-tx text create then append is fine).
if !tx.pending.contains_key(&file_path) {
crate::ops::file::ensure_not_binary_file(&file_path, path)?;
}
let existing = read_file_content(tx.pending, tx.existed_before, &file_path)?;
let combined = crate::ops::file::append_content(existing, content);
tx.write_file(&file_path, combined);
}
Operation::FilePrepend { path, content } => {
let file_path = tx.cwd.join(path);
if file_path.exists() && !file_path.is_file() {
return Err(crate::exit::InvalidInputError {
msg: format!("target is not a file: {path}"),
}
.into());
}
if tx.deletions.contains(&file_path) {
return Err(std::io::Error::new(
std::io::ErrorKind::NotFound,
format!("file was deleted earlier in this transaction: {path}"),
)
.into());
}
if !file_path.exists() && !tx.pending.contains_key(&file_path) {
return Err(std::io::Error::new(
std::io::ErrorKind::NotFound,
format!("file does not exist: {path}"),
)
.into());
}
if !tx.pending.contains_key(&file_path) {
crate::ops::file::ensure_not_binary_file(&file_path, path)?;
}
let existing = read_file_content(tx.pending, tx.existed_before, &file_path)?;
let combined = crate::ops::file::prepend_content(existing, content);
tx.write_file(&file_path, combined);
}
Operation::FileCreate {
path,
content,
force,
} => {
let file_path = tx.cwd.join(path);
if file_path.exists() && !file_path.is_file() {
return Err(crate::exit::InvalidInputError {
msg: format!("target is not a file: {path}"),
}
.into());
}
// Reject ancestors that exist as files before staging so commit
// does not leave a bare tempfile error or a backup for an unwritten path.
crate::ops::file::ensure_parent_components_are_directories(&file_path)?;
if force.unwrap_or(false) {
if tx.pending.contains_key(&file_path) || file_path.exists() {
let _ = read_file_content(tx.pending, tx.existed_before, &file_path)?;
}
tx.write_file(&file_path, content.clone());
} else {
let exists_in_tx =
tx.pending.contains_key(&file_path) && !tx.deletions.contains(&file_path);
if exists_in_tx || (!tx.deletions.contains(&file_path) && file_path.exists()) {
return Err(crate::exit::AlreadyExistsError {
msg: format!("file already exists: {path}"),
}
.into());
}
tx.write_file(&file_path, content.clone());
}
}
Operation::FileDelete { path } => {
let file_path = tx.cwd.join(path);
if file_path.exists() && !file_path.is_file() {
return Err(crate::exit::InvalidInputError {
msg: format!("target is not a file: {path}"),
}
.into());
}
let created_in_tx = match tx.pending.get(&file_path) {
Some((original, _)) => original.is_empty() && !file_path.exists(),
None => {
if !file_path.exists() {
return Err(std::io::Error::new(
std::io::ErrorKind::NotFound,
format!("file not found: {path}"),
)
.into());
}
tx.existed_before.insert(file_path.clone());
// Try to read as text for strict rollback; fall back to
// empty for binary files that cannot be represented as
// UTF-8 (#1163).
match std::fs::read_to_string(&file_path) {
Ok(content) => {
tx.pending
.insert(file_path.clone(), (content.clone(), content));
}
Err(_) => {
tx.pending
.insert(file_path.clone(), (String::new(), String::new()));
}
}
false
}
};
if created_in_tx {
tx.pending.remove(&file_path);
tx.deletions.remove(&file_path);
} else {
tx.write_file(&file_path, String::new());
tx.deletions.insert(file_path);
}
}
Operation::FileRename { from, to, force } => {
let src_path = tx.cwd.join(from);
let dst_path = tx.cwd.join(to);
if tx.deletions.contains(&src_path) {
return Err(std::io::Error::new(
std::io::ErrorKind::NotFound,
format!("source file was deleted earlier in this transaction: {from}"),
)
.into());
}
if src_path.exists() && !src_path.is_file() {
return Err(crate::exit::InvalidInputError {
msg: format!("source is not a file: {from}"),
}
.into());
}
if dst_path.exists() && !dst_path.is_file() {
return Err(crate::exit::InvalidInputError {
msg: format!("destination is not a file: {to}"),
}
.into());
}
crate::ops::file::ensure_parent_components_are_directories(&dst_path)?;
// If source and destination resolve to the same file, no-op.
// Allow case-only renames on case-insensitive filesystems (#1167).
let case_only = src_path != dst_path
&& src_path.parent() == dst_path.parent()
&& src_path.file_name().map(|n| n.to_ascii_lowercase())
== dst_path.file_name().map(|n| n.to_ascii_lowercase());
if !case_only
&& (src_path == dst_path
|| matches!(
(src_path.canonicalize(), dst_path.canonicalize()),
(Ok(ref s), Ok(ref d)) if s == d
))
{
return Ok(0);
}
// Read source content into pending (validates it exists).
let content = read_file_content(tx.pending, tx.existed_before, &src_path)?.to_string();
// Check destination does not already exist (unless force or
// case-only rename on case-insensitive FS).
if !force && !case_only {
let dst_exists = (tx.pending.contains_key(&dst_path)
&& !tx.deletions.contains(&dst_path))
|| (!tx.deletions.contains(&dst_path) && dst_path.exists());
if dst_exists {
return Err(crate::exit::AlreadyExistsError {
msg: format!("destination already exists: {to}"),
}
.into());
}
}
// If destination exists on disk, load it into pending first so
// existed_before is populated and commit uses atomic_write (not
// atomic_create_new which would fail on existing files).
if (*force || case_only) && !tx.pending.contains_key(&dst_path) && dst_path.exists() {
let _ = read_file_content(tx.pending, tx.existed_before, &dst_path)?;
}
// Record renames so commit can use fs::rename and preserve hardlinks
// even when a later op edits the dest (#1739 follow-up:
// rename-then-replace). Also chain renames where the source is only
// a prior rename dest in this plan (a->c then c->d; c is not on disk
// yet during staging). file.create-then-rename stays content-staged
// (source neither on disk nor a rename dest).
//
// Force overwrite (dest already exists) must also record the pair:
// commit's rename_or_copy replaces the dest entry while keeping the
// source inode (and its hardlink siblings). Skipping the record falls
// back to create-dest + delete-src and splits hardlinks (#1746).
if !case_only {
let src_on_disk = src_path.exists() && src_path.is_file();
let src_is_rename_dest = tx.renames.iter().any(|(_, to)| to == &src_path);
// Non-force with an on-disk dest is rejected earlier. Force may
// overwrite; non-force only records when dest is not on disk.
if (src_on_disk || src_is_rename_dest) && (*force || !dst_path.exists()) {
tx.renames.push((src_path.clone(), dst_path.clone()));
}
}
// Write content to destination.
tx.write_file(&dst_path, content);
// Delete source (same logic as file.delete for tx-created files).
let created_in_tx = match tx.pending.get(&src_path) {
Some((original, _)) => original.is_empty() && !src_path.exists(),
None => false,
};
if created_in_tx {
tx.pending.remove(&src_path);
tx.deletions.remove(&src_path);
} else {
tx.write_file(&src_path, String::new());
tx.deletions.insert(src_path);
}
}
_ => anyhow::bail!("execute_file_op called with non-file operation"),
}
Ok(0)
}