Problem with absolute symbolic links
Dave Dykstra
dwd at drdykstra.us
Mon Dec 16 16:05:59 EST 2002
First question: must you use an rsync daemon on the Unix side? Rsh or
Ssh is a lot easier. If you do need to use it, you need to know that the
original intention of rsync modules was to only permit files under that
module to be accessible. With the default "use chroot = yes" option,
rsync chroot's to the directory so no files outside of the top path can
be reached. Long ago I added the "use chroot = no" option so an rsync
daemon could be run under a non-root user id (because only root can run
chroot()), but even then it goes through pains to filter out paths that
attempt to go outside of the top module. However, I believe, but am not
sure, that if --copy-links is used with "use chroot = no" it should pull
in files pointed to by symlinks from outside the top. Try it out.
- Dave Dykstra
On Fri, Dec 13, 2002 at 01:44:30PM -0500, Kevin Minder wrote:
> I'm trying to synchronize a particularly troublesome directory structure on a SunOS box to a PC. I really want all symbolic links resolved to real files on the PC when everything is done. I can't seem to find any combination of parameters that will accomplish this.
>
> It boils down to two problems.
> 1. It seems like that even if I exclude a symbolic link that is a directory it is not excluded.
> 2. It seems like copy-links and copy-unsafe-links don't work for symbolic links to directories outside the source tree.
>
> Is this the correct behavior or am I doing something wrong.
> Any input is greatly appreciated.
>
> Here is my rsyncd.conf file...
> -----------------------------------
> motd file = /etc/rsyncd.motd
> log file = /var/log/rsyncd.log
> pid file = /var/run/rsyncd.pid
> uid = kminder
> gid = svrtech
>
> [test]
> path = /home/kminder/rsync/test
> comment = test
> read only = yes
> list = yes
> -----------------------------------
>
> Below is a simplified source structure on the unix side (source).
> Note the .rel symlink and the .abs symlink.
>
> -----------------------------------
> /home/kminder/rsync> ls -al outside test
> outside:
> total 16
> drwxr-xr-x 2 kminder g904 4096 Dec 13 11:37 .
> drwxr-xr-x 5 kminder g904 4096 Dec 13 11:29 ..
> -rw-r--r-- 1 kminder g904 15 Dec 13 11:37 file
>
> test:
> total 24
> drwxr-xr-x 3 kminder g904 4096 Dec 13 11:36 .
> drwxr-xr-x 5 kminder g904 4096 Dec 13 11:29 ..
> lrwxrwxrwx 1 kminder g904 27 Dec 13 11:36 .abs -> /home/kminder/rsync/outside
> lrwxrwxrwx 1 kminder g904 3 Dec 13 11:34 .rel -> dir
> lrwxrwxrwx 1 kminder g904 9 Dec 13 11:36 absfile -> .abs/file
> drwxr-xr-x 2 kminder g904 4096 Dec 13 11:34 dir
> -rw-r--r-- 1 kminder g904 10 Dec 13 11:32 file
> lrwxrwxrwx 1 kminder g904 4 Dec 13 11:33 link -> file
> lrwxrwxrwx 1 kminder g904 4 Dec 13 11:33 linklink -> link
> lrwxrwxrwx 1 kminder g904 9 Dec 13 11:35 relfile -> .rel/file
> -----------------------------------
>
> I'm trying for the following structure on the pc (cygwin ls -al).
> Note that all links should be resolved.
> I want the duplicate files.
>
> -----------------------------------
> drwxr-xr-x+ 4 kminder None 4096 Dec 13 11:36 .
> drwxrwxrwx+ 14 Administ Administ 8192 Dec 13 11:20 ..
> drwxr-xr-x+ 2 kminder None 0 Dec 13 11:34 dir
> -rw-r--r-- 1 kminder None 10 Dec 13 11:32 file
> -rw-r--r-- 1 kminder None 10 Dec 13 11:32 link
> -rw-r--r-- 1 kminder None 10 Dec 13 11:32 linklink
> -rw-r--r-- 1 kminder None 14 Dec 13 11:34 relfile
> -rw-r--r-- 1 kminder None 14 Dec 13 11:34 absfile
> -----------------------------------
>
> When I execute the command that I think should accomplish this...
> D:\sync>rsync -rptgDvP --port=34343 --copy-links --copy-unsafe-links --exclude .rel --exclude .abs kminder at usunnbd25::test d:\sync
> The resulting output follows...
>
> -----------------------------------
> receiving file list ...
> readlink absfile: No such file or directory
> 7 files to consider
> ../
> dir/
> dir/file
> 14 100% 0.00kB/s 0:00:00
> file
> 10 100% 9.77kB/s 0:00:00
> link
> 10 100% 9.77kB/s 0:00:00
> linklink
> 10 100% 9.77kB/s 0:00:00
> relfile
> 14 100% 13.67kB/s 0:00:00
> wrote 190 bytes read 465 bytes 187.14 bytes/sec
> total size is 58 speedup is 0.09
> rsync error: partial transfer (code D:\sync>dir23) at /tmp/rsync-2.5.5/main.c(926)
> -----------------------------------
>
> My disk ends up looking as follows. Again using cygwin ls -al.
>
> -----------------------------------
> drwxr-xr-x+ 4 kminder None 4096 Dec 13 11:36 .
> drwxrwxrwx+ 14 Administ Administ 8192 Dec 13 11:20 ..
> drwxr-xr-x+ 2 kminder None 0 Dec 13 11:34 .rel
> drwxr-xr-x+ 2 kminder None 0 Dec 13 11:34 dir
> -rw-r--r-- 1 kminder None 10 Dec 13 11:32 file
> -rw-r--r-- 1 kminder None 10 Dec 13 11:32 link
> -rw-r--r-- 1 kminder None 10 Dec 13 11:32 linklink
> -rw-r--r-- 1 kminder None 14 Dec 13 11:34 relfile
> -----------------------------------
>
> If I do it without the excludes like this...
> rsync -rptgDvP --port=34343 --copy-links --copy-unsafe-links kminder at usunnbd25::test d:/sync
> The output is this...
>
> -----------------------------------
> receiving file list ...
> readlink .abs: No such file or directory
> readlink absfile: No such file or directory
> 9 files to consider
> ../
> dir/
> dir/file
> 14 100% 0.00kB/s 0:00:00
> file
> 10 100% 9.77kB/s 0:00:00
> link
> 10 100% 9.77kB/s 0:00:00
> linklink
> 10 100% 9.77kB/s 0:00:00
> relfile
> 14 100% 13.67kB/s 0:00:00
> wrote 174 bytes read 540 bytes 204.00 bytes/sec
> total size is 72 speedup is 0.10
> rsync error: partial transfer (code 23) at /tmp/rsync-2.5.5/main.c(926)
> -----------------------------------
>
> My PC filesystem looks the same as it did above.
>
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