drpmsync(8) sync a file tree with deltarpms


drpmsync [-c config] [source] dir
drpmsync [-s|-S] serverconfig


Drpmsync keeps a local file system tree in sync with a remote one. Its intended use is to work with rpm trees; the deltarpm technology can only save bandwidth if rpms get transmitted. Please use the rsync program for normal file trees.

Drpmsync can run in two modes: as a client it connects to a server, receives a file list and brings the tree up to date, as a server it answers incoming requests and transmits files and rpms.


In this mode drpmsync updates the tree in dir. It opens the configuration file dir/drpmsync/config to get information about which server to use and other settings. You can specify a different configuration file with the -c option. The following settings are understood (the default for the boolean settings is false):

source: server1 server2...

This is a list of servers to connect to. Drpmsync advances through this list until a working server is found. If a source is specified on the command line it is used instead of the one from the configuration. The syntax for the server entries is "host[:port]/tree".

log: logfile

Specifies the name of a logfile. If the name does not start with a slash, dir/drpmsync/ is prepended to it.

generate_deltas: true|false

Controls whether drpmsync generates a delta if it receives a new version of a rpm and the server doesn't provide a delta. This is only useful if the local tree is also exported to other clients via a local drpmsync server.

generate_delta_compression: comp

This parameter is forwarded to the makedeltarpm program when creating deltas. An example would be gzip,gzip.

keep_deltas: true|false

Tell drpmsync to save received or freshly created deltas to the dir/drpmsync/delta directory. Automatically true if generate_deltas or keep_uncombined is set to true.

keep_uncombined: true|false

This tells drpmsync to request uncombined deltas from the server instead of a precombined single delta. This makes sense if you re-export the tree and want to maximize the number of versions your clients can update from.

always_get_rpm: true|false

Configures whether drpmsync should request that the full rpm is always sent along with the delta. Only makes sense if you have a fast network connection so that applydeltarpm takes longer than transmitting the ful rpm.

deltarpmpath: path

Sets the directory where drpmsync searches for the deltarpm programs. The default is to search the $PATH variable.


Drpmsync can wither work as CGI script or as a standalone server. CGI script mode is automatically selected if the REQUEST_METHOD environment variable is set. In this mode drpmsync expects the DRPMSYNC_CONFIG environment variable to contain the path to a server config file. For apache you can set this with the SetEnv directive.

Standalone mode is selected with the -s or -S option. In this mode the server configuration must be specified as an argument to the drpmsync program. The -s option makes the drpmsync program background itself and exit right away, while -S keeps the server in the foreground.

The server configuration can contain the following settings:

allow: pattern1 pattern2...
deny: pattern1 pattern2...

This provides the access control for the server. pattern can either be a simple glob pattern (only * is supported) or it can be a full regular expression if it is written as /RE/. The regular expression is automatically anchored at the start and the end. Examples are 10.10.* or /10\.10\..*/ If either the numerical ip address or the domain name of the client matches any entry of the deny list, access is forbidden. Otherwise the allow list is searched for a match. If none is found, access is also denied. The default setting for both lists is empty, so you have to provide an allow list to allow access for the clients.

log: logfile

Specifies the path of a logfile.

no_combine: true|false

If this setting is true the server does not combine deltarpms. This increases to amount of data that has to be transferred but reduces the processor load on the server.

tree: external_path internal_path

This statements exports the tree located at internal_path to the clients as directory external_path. All of the above settings are saved as settings of this particular tree, so different trees can use different configurations. This also means that the configuration directives of a tree must be above the tree statement.

The following settings are global and only needed for standalone mode:

serverlog: logfile

Specifies the path of a logfile used for logging server events.

servername: hostname[:port]

The name of the server. If hostname is empty, the fully qualified domain name is used instead. The port defaults to port 80.

serveraddr: addr

This address is used for binding the server's socket. If not specified, connections can come from any interface.

serveruser: user
servergroup: group

Configures the user and group the servers swicthes to after binding the socket to the desired port. Examples are nobody or wwwrun.

maxclients: num

This settings limits the maximum number of concurrent connections to num. The default value is 10 connections.

deltarpmpath: path

Sets the directory where drpmsync searches for the deltarpm programs. The default is to search the $PATH variable.


directory used to store the deltas
lock used to serialize syncrpm calls
temporary storing space for the transmitted objects
md5sum cache to speed up the calculation of the tree state
contains the time of the last finished sync and the last time the remote tree state was requested.


Michael Schroeder <[email protected]>