When using --partial-dir, an interrupted transfer of a read-only file
fails on retry. When using --partial instead, the retry succeeds.
This is regardless whether the target file is local or remote (ssh).
The attached script reproduces the problem.
OS: Debian 13/Trixie
% rsync --version
rsync version 3.4.1 protocol version 32
Copyright (C) 1996-2025 by Andrew Tridgell, Wayne Davison, and others.
Web site: https://rsync.samba.org/
Capabilities:
64-bit files, 64-bit inums, 64-bit timestamps, 64-bit long ints,
socketpairs, symlinks, symtimes, hardlinks, hardlink-specials,
hardlink-symlinks, IPv6, atimes, batchfiles, inplace, append, ACLs,
xattrs, optional secluded-args, iconv, prealloc, stop-at, no crtimes
Optimizations:
SIMD-roll, no asm-roll, openssl-crypto, no asm-MD5
Checksum list:
xxh128 xxh3 xxh64 (xxhash) md5 md4 sha1 none
Compress list:
zstd lz4 zlibx zlib none
Daemon auth list:
sha512 sha256 sha1 md5 md4
TNX
R'
Script:
---snip------------------------------------------
#!/bin/sh
#
# Summary: using --partial-dir=.rsync to transfer a read-only file
# fails on retry when the initial transfer is interrupted.
#
# Using --partial instead succeeds to transfer the file if the
# transfer is interrupted.
###########################
# files: source
datafile=datafile
# rsync target
outputfile=datafile.out
# staging dir for --partial-dir
stagingdir=.rsync
# show the bug with --partial-dir
partialopt="--partial-dir=$stagingdir"
# using --partial instead does not have the problem,
# although the partial file is readonly, too
# uncomment next line to show
# partialopt=--partial
###########################
# create large file
test -f $datafile || dd if=/dev/random bs=1G count=1 > $datafile
# make the file readonly
chmod 444 $datafile
# remove staging dir and rsync target file
rm -rf $stagingdir $outputfile
# transfer the file via rsync and interrupt the transfer
rsync -av --progress $partialopt $datafile $outputfile &
pid=$!
sleep 0.1
kill $pid
# collect rsync zombie
wait
# check the file(s)
ls -l
# note: file is partially transferred in the staging dir and *read-only*
test -d $stagingdir && ls -la $stagingdir
# if we change the target file in the staging dir to rw here, no problem
# chmod 600 $stagingdir/$outputfile
# restart rsync
echo restarting rsync
rsync -av --progress $partialopt $datafile $outputfile
# show result
ls -l
test -d $stagingdir && ls -la $stagingdir
# EOF
---snip------------------------------------------
--
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