https://bugs.kde.org/show_bug.cgi?id=524944
Bug ID: 524944
Summary: kio_ftp appends absolute path to current working
directory during RETR, causing doubled path 550 errors
on Apache FtpServer
Classification: Frameworks and Libraries
Product: kio-extras
Version First unspecified
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: SFTP
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
ENVIRONMENT
- OS: CachyOS
- Desktop Environment: KDE Plasma
- Component: kio-extras (kio_ftp worker)
- Target FTP Server: Android FTP Server (identifies as "215 UNIX Type: Apache
FtpServer")
STEPS TO REPRODUCE
1. Host an FTP server on an Android device running Apache Mina FtpServer.
2. Enable KIO FTP debug logging and attempt a file copy using kioclient5:
QT_LOGGING_RULES="kf.kio.workers.ftp.debug=true" kioclient5 copy
"ftp://<SERVER_IP>:<PORT>/DCIM/Camera/<FILE>.jpg" ~/test.jpg
3. Inspect the command-by-command trace output.
OBSERVED RESULTS
1. kio_ftp authenticates and issues `CWD /DCIM/Camera` to inspect/stat the
target file.
2. When transitioning to fetch the file contents (RETR), kio_ftp sends the full
absolute path while remaining inside `/DCIM/Camera/`.
3. The server attempts to resolve `/DCIM/Camera//DCIM/Camera/<FILE>.jpg` and
responds with:
`550 /DCIM/Camera//DCIM/Camera/<FILE>.jpg: No such file or directory`
4. kio_ftp retries three times on new PASV ports, repeats the doubled path
request, and ultimately fails with "Can't open for reading."
EXPECTED RESULTS
kio_ftp should either:
1. Issue `RETR <FILE>.jpg` relative to the current working directory
(`/DCIM/Camera/`), OR
2. Reset the working directory to root (`CWD /`) before issuing `RETR
/DCIM/Camera/<FILE>.jpg`.
ADDITIONAL CONTEXT & PROOF
- Curl test: Fetching the exact same file using `curl` over the same network
and credentials works without issues, proving the server, firewall, and network
stack are operating correctly.
- Headless test: Thumbnails were completely disabled, and the issue reproduces
identically in `kioclient5`, confirming the bug resides in kio_ftp's internal
path/state management rather than Dolphin's UI.
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