feature: no partial transfer resume or --partial support #37

New Issue

2026-07-20T14:58:20+02:00

TapTap commented

2026-07-20 14:58:20 +02:00

FastSync has no mechanism to resume partially transferred files if a connection drops mid-transfer:

src/shared/file.c: to_disk() writes to a temp location, but if the transfer is interrupted, the partial file remains at the final path with no recovery.
src/client/client_send.c: There is no --partial or --partial-dir option (unlike rsync).
No temp file naming: Files are written directly to their final path — there is no .part suffix or atomic rename pattern.
No recovery on reconnect: If the client reconnects after a failure, it starts from scratch with no knowledge of what was already transferred.

Rsync provides --partial and --partial-dir to keep partially transferred files and resume them on retry. Without this, large file transfers over unreliable connections are fragile.

Suggested Fix:

Write files to a .part temp name first, then atomically rename on completion
Store transfer state to allow resuming
Add --partial and --partial-dir CLI options

Severity: medium

FastSync has no mechanism to resume partially transferred files if a connection drops mid-transfer: 1. **`src/shared/file.c`**: `to_disk()` writes to a temp location, but if the transfer is interrupted, the partial file remains at the final path with no recovery. 2. **`src/client/client_send.c`**: There is no `--partial` or `--partial-dir` option (unlike rsync). 3. **No temp file naming**: Files are written directly to their final path — there is no `.part` suffix or atomic rename pattern. 4. **No recovery on reconnect**: If the client reconnects after a failure, it starts from scratch with no knowledge of what was already transferred. Rsync provides `--partial` and `--partial-dir` to keep partially transferred files and resume them on retry. Without this, large file transfers over unreliable connections are fragile. **Suggested Fix:** 1. Write files to a `.part` temp name first, then atomically rename on completion 2. Store transfer state to allow resuming 3. Add `--partial` and `--partial-dir` CLI options **Severity:** medium

TapTap referenced this issue from a commit

2026-07-20 18:25:17 +02:00

fix: features and enhancements — issues #70, #36, #34, #33, #32, #57, #40, #37

TapTap referenced this issue

2026-07-20 18:25:20 +02:00

Features and enhancements (#70, #36, #34, #33, #32, #57, #40, #37) #77

TapTap referenced this issue from a commit

2026-07-20 18:30:12 +02:00

fix: features and enhancements — issues #70, #36, #34, #33, #32, #57, #40, #37

TapTap referenced this issue from a commit

2026-07-20 18:37:01 +02:00

fix: features and enhancements — issues #70, #36, #34, #33, #32, #57, #40, #37