fix: let :w! chmod unwritable files like upstream bufwrite - #44
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Upstream buf_write (bufwrite.c:1184-1190) gives a forced write u+w on files missing the user-write bit, restores the mode after a successful close, and clears 'readonly' for own-file writes unless cpoptions has 'Z' (bufwrite.c:1191). oxvim returned E212 outright and left the 'readonly' option set, so a 444 file stayed unwritable forever. force_writable mirrors the pre-open chmod through the FileIO seam (skip when cpoptions 'W' blocks forced writes), the mode restore runs after a successful write, and the 'readonly' reset keys on write_overwrites_buffer so :w! other-file keeps the option. Both :w/:x-adjacent sites (command_write, command_wqall) share the helper.
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📝 SummarySummary by CodeRabbit
WalkthroughForced writes can temporarily add user-write permission and restore the original mode after a successful write. The write paths also clear the buffer’s ChangesForced write behavior
Priority: ⬇️ Low Change: Bug fix Merge Risk: 🔵 Low · up to A failed forced write can leave a previously write-protected file writable. Restore permissions on failure before merging, or explicitly accept this bounded, manually recoverable behavior. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Failed writes can leave files writable, and permission-restoration failures are silently ignored. Permission changes also use independently resolved paths, creating a conditional risk of modifying the wrong file during concurrent replacement. Exposure remains bounded by the editor’s operating-system privileges; no privilege escalation is established. Retained concerns
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @crates/ox-editor/src/excmd_exec.rs:
- Around line 9625-9631: In the write-failure paths of command_write and
command_wqall, restore the original permissions from restore_perm with
set_permissions before returning E212. Leave the existing successful-write
permission restoration unchanged.
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crates/ox-editor/src/excmd_exec.rs
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Github Grep
- Upstream Vim checks both the buffer’s
readonlystate and filesystem permissions before non-forced writes;forceitbypasses this guard. (Source: Github Grep · searchGitHub) - Upstream autowrite logic likewise skips readonly buffers only when
forceitis false. (Source: Github Grep · searchGitHub) - Searches of
gosuda/oxvimfound no indexed matches forwrite_overwrites_bufferorcommand_wqall, so the PR implementation itself could not be independently retrieved. (Source: Github Grep · searchGitHub)
Context7
- Vim documentation lookup was rate-limited; no additional documentation was retrieved. (Source: Context7 · resolve-library-id)
| if let Err(error) = runtime.scripts.io().write_string(&path, &contents) { | ||
| return error_flow( | ||
| runtime, | ||
| "E212", | ||
| format!("Can't open file for writing: {error}"), | ||
| ); | ||
| } |
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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
Restore the mode when the write fails.
force_writable adds u+w to the file. If write_string then fails, the code returns E212 and never restores the original mode. The file stays user-writable, and the later if let Some(mode) = restore_perm block is skipped.
The failure paths need the same restore. Upstream buf_write also restores the mode on error. The pattern is the same in command_write and command_wqall.
Proposed fix for command_write
- if let Err(error) = runtime.scripts.io().write_string(&path, &contents) {
- return error_flow(
+ if let Err(error) = runtime.scripts.io().write_string(&path, &contents) {
+ if let Some(mode) = restore_perm {
+ let _ = runtime.scripts.io().set_permissions(&path, mode);
+ }
+ return error_flow(Apply the same change in command_wqall before its return error_flow(... "E212" ...).
Also applies to: 11961-11971
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Review comment at @crates/ox-editor/src/excmd_exec.rs around lines 9625 - 9631:
In the write-failure paths of command_write and command_wqall, restore the
original permissions from restore_perm with set_permissions before returning
E212. Leave the existing successful-write permission restoration unchanged.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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Verified against the reference bufwrite.c: this divergence is upstream's actual behavior, so the suggested change would create drift in the other direction.
made_writable is set at bufwrite.c:1187-1189 before the open, but the restore (perm &= ~0200; os_setperm(wfname, perm)) only runs at bufwrite.c:1607-1612 inside the write-success block. The fail:/nofail: tail (bufwrite.c:1812-1848) frees backup/buffer/iconv state and emits the error — it never calls os_setperm. So when a forced write chmods a file writable and the write then fails, upstream Vim/Neovim leaves the file user-writable too.
Current behavior is faithful: on E212 the file keeps +w, matching upstream exactly. Keeping it as-is.
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Summary
:w!on a file the user can't write (e.g.chmod 444) returnedE212: Can't open file for writingand left the buffer'sreadonlyoption set, so the file stayed unwritable forever. Upstreambuf_writetemporarily chmods the file writable for forced writes and restores it after, so the write succeeds and the file ends back at 444.force_writablehelper (excmd_exec.rs) mirrorsbufwrite.c:1184-1190:forceit && mode & 0o200 == 0→FileIO::set_permissions(mode | 0o200)beforewrite_string, and the original mode is restored after a successful write.cpoptions'W'(kCpoFwrite) skips the retry entirely, and a failed chmod just falls through to honest E212 like upstream's non-owned-file path.command_writeclears thereadonlyoption after a forced write that targets the buffer's own file (write_overwrites_buffer), unlesscpoptionscontains'Z'(kCpoKeepro) —bufwrite.c:1191.:w! otherfilekeeps the option.command_wqallgets the same treatment so:wqall!handles readonly files identically.Verified E2E via
--embed: 444 file +:w!writes, file ends back at mode 444,readonlyreportsfalse, and a follow-up plain:whits E212 exactly like upstream.:wqall!on a 444 file writes and exits clean. Wave-3 adversarial suite 39/39,cargo nextest -p ox-editor1708/1708, no new clippy/fmt issues.Link to Devin session: https://app.devin.ai/sessions/5f07717a060d44ddafade088e73fe4fc
Open in Devin Desktop: https://app.devin.ai/desktop/session/5f07717a060d44ddafade088e73fe4fc?variant=devin
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