The "/tarball" page:

URL: /tarball/NAME.tar.gz or: /tarball/VERSION/NAME.tar.gz or: /tarball/TAG/VERSION/NAME.tar.gz

Generate a compressed tarball for the check-in specified by VERSION. The tarball is called NAME.tar.gz and has a top-level directory called NAME. If TAG is provided, then VERSION must hold TAG or else an error is returned.

The optional VERSION element defaults to the name of the main branch (usually "trunk") per the r= rules below. All of the following URLs are equivalent:

/tarball/release/xyz.tar.gz
/tarball?r=release&name=xyz.tar.gz
/tarball/xyz.tar.gz?r=release
/tarball?name=release/xyz.tar.gz

Query parameters:

name=[CKIN/]NAME
The optional CKIN component of the name= parameter identifies the check-in from which the tarball is constructed. If CKIN is omitted and there is no r= query parameter, then use the name of the main branch (usually "trunk"). NAME is the name of the download file. The top-level directory in the generated tarball is called by NAME with the file extension removed.

r=TAG
TAG identifies the check-in that is turned into a compressed tarball. The default value is the name of the main branch (usually "trunk"). If r= is omitted and if the name= query parameter contains one "/" character then the of part the name= value before the / becomes the TAG and the part of the name= value after the / is the download filename. If no check-in is specified by either name= or r=, then the name of the main branch (usually "trunk") is used.

in=PATTERN
Only include files that match the comma-separate list of GLOB patterns in PATTERN, as with ex=

ex=PATTERN
Omit any file that match PATTERN. PATTERN is a comma-separated list of GLOB patterns, where each pattern can optionally be quoted using ".." or '..'. Any file matching both ex= and in= is excluded.

Robot Defenses:

If "zip" appears in the robot-restrict setting, then robots are not allowed to access this page. Suspected robots will be presented with a captcha.
If "zipX" appears in the robot-restrict setting, then robots are restricted in the same way as with "zip", but with exceptions. If the check-in for which an archive is requested is a leaf check-in and if the robot-zip-leaf setting is true, then the request is allowed. Or if the check-in has a tag that matches any of the GLOB patterns on the list in the robot-zip-tag setting, then the request is allowed. Otherwise, the usual robot defenses are activated.