Syncing a write protected folder

[TempyOne]

Hi,

I've already asked in IRC, but i somehow can't belive this isn't
possible.

I have the folowing testcase (local, on an ext3 fs, no xattr):

.
├── [dr-xr-xr-x]  dir1
│   └── [-r--r--r--]  text.txt
└── [drwxr-xr-x]  target


and what i want after using 'rsync <some options> dir1 target' is:

.
├── [dr-xr-xr-x]  dir1
│   └── [-r--r--r--]  text.txt
└── [drwxr-xr-x]  target
    └── [dr-xr-xr-x]  dir1
        └── [-r--r--r--]  text.txt


Now i did some tries:

"rsync -rvt dir1 target" throw an error message:
mkstemp "../target/dir1/.text.txt.AQGaMg" failed: Permission denied

And that's what rsync did so far:

.
├── [dr-xr-xr-x]  dir1
│   └── [-r--r--r--]  text.txt
└── [drwxr-xr-x]  target
    └── [dr-xr-xr-x]  dir1


What i'm confused about is, after i did the exatcly same command again:

.
├── [dr-xr-xr-x]  dir1
│   └── [-r--r--r--]  text.txt
└── [drwxr-xr-x]  target
    └── [dr-xr-xr-x]  dir1
        └── [-r--r--r--]  text.txt

And no error message was thrown.

The only possible way to sync such a folder without any error message
was to change the permissions by hand with '--chmod=u+w' and '--perms'.
The disadvantage: All previous file permissions are 'lost' in the copy.
So i tried after the first sync a second sync where only the file
permissions shall be synced. Thus after the latter command i have:

.
├── [dr-xr-xr-x]  dir1
│   └── [-r--r--r--]  text.txt
└── [drwxr-xr-x]  target
    └── [drwxr-xr-x]  dir1
        └── [-rw-r--r--]  text.txt

But after "rsync --perms -r -v dir1 target" i've got an error message
again:
mkstemp "../target/dir1/.text.txt.AP4sMs" failed: Permission denied

And the filetree:

.
├── [dr-xr-xr-x]  dir1
│   └── [-r--r--r--]  text.txt
└── [drwxr-xr-x]  target
    └── [dr-xr-xr-x]  dir1 <-- correct
        └── [-rw-r--r--]  text.txt <-- wrong


Ok. So my final question is: Is it even possible what i want to
do with rsync? The real situation is seriously far more complex (dir1
is in fact much bigger) and i realy want somehow to preserve the file
permissions in the copy.

Meanwhile thanks for any advise.