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No ng_backup code changes needed: files_external's generic backend/auth adapter (the same
ExternalStorageFactory/StorageBackend already used for S3/SFTP) already covers FTP and SMB, and
NFS was never a files_external backend to begin with (PLAN.md 3.5) -- the "local" backend plus an
admin-managed OS-level mount already does the job. This commit is test coverage and documentation.
tests/integration/targets-matrix.sh now also runs the full round trip against:
- FTP (stilliard/pure-ftpd). A first attempt with delfer/alpine-ftp-server (vsftpd) failed with a
generic "create directory operation failed": files_external's FTP backend always builds
absolute paths, which that server's chroot rejects even via plain php ftp_mkdir() with an
absolute path (a relative path on the same server works fine) -- not a files_external or
ng_backup bug, just a server-specific quirk, confirmed by switching test servers.
- SMB (dperson/samba), via a small Nextcloud image built on the fly with the smbclient PECL
extension (libsmbclient-dev + pecl install), in its own temp directory as the build context
(never /tmp directly). The backend *lists* as available with just the smbclient CLI binary too
(files_external's shell-wrapped fallback), but that fallback's stream cannot seek, and ng_backup
reads blobs back by byte range while backing up -- confirmed live, it fails the very first
(small) backup with "Seek failed in packs/...". The native extension is genuinely required here,
not just preferred.
README: new "Storage backend experiences" entries for both findings (and a pointer from the
"no extra PHP extensions" intro line, since SMB is the one real exception), plus NFS guidance
(mount it yourself, point the local backend at the mount point).
PLAN.md: FTP/SMB marked done; SMB/NFS testing on the user's own OMV instance stays open (internal,
not something CI can cover).
Local review (Codex + CodeRabbit) found three issues, all fixed: the README's first-pass SMB claim
("CLI tool is not enough") was imprecise about *why* -- it lists fine without the extension, it
just doesn't work for ng_backup's read pattern; the cleanup trap could abort before removing the
network if an earlier docker rm failed, and didn't remove the built image/Dockerfile; and the
Docker build used all of /tmp as its context instead of a dedicated directory.