Version Control with Subversion - Login

Advanced Topicsnumber:$ svn log -r {2006-11-28}------------------------------------------------------------------------r12 | ira | 2006-11-27 12:31:51 -0600 (Mon, 27 Nov 2006) | 6 lines…Is Subversion a Day Early?If you specify a single date as a revision without specifying a time of day (for example2006-11-27), you may think that Subversion should give you the last revision thattook place on the 27th of November. Instead, you'll get back a revision from the 26th,or even earlier. Remember that Subversion will find the most recent revision of the repositoryas of the date you give. If you give a date without a timestamp, such as2006-11-27, Subversion assumes a time of 00:00:00, so looking for the most recentrevision won't return anything on the 27th.If you want to include the 27th in your search, you can either specify the 27th with thetime ({"2006-11-27 23:59"}), or just specify the next day ({2006-11-28}).You can also use a range of dates. Subversion will find all revisions between both dates,inclusive:$ svn log -r {2006-11-20}:{2006-11-29}…PropertiesSince the timestamp of a revision is stored as an unversioned, modifiableproperty of the revision (see the section called “Properties”), revisiontimestamps can be changed to represent complete falsifications of true chronology,or even removed altogether. Subversion's ability to correctly convertrevision dates into real revision numbers depends on revision datestampsmaintaining a sequential ordering—the younger the revision, the younger itstimestamp. If this ordering isn't maintained, you will likely find that trying to usedates to specify revision ranges in your repository doesn't always return thedata you might have expected.We've already covered in detail how Subversion stores and retrieves various versions offiles and directories in its repository. Whole chapters have been devoted to this most fundamentalpiece of functionality provided by the tool. And if the versioning support stoppedthere, Subversion would still be complete from a version control perspective.But it doesn't stop there.In addition to versioning your directories and files, Subversion provides interfaces foradding, modifying, and removing versioned metadata on each of your versioned directoriesand files. We refer to this metadata as properties, and they can be thought of as twocolumntables that map property names to arbitrary values attached to each item in yourworking copy. Generally speaking, the names and values of the properties can bewhatever you want them to be, with the constraint that the names must contain only ASCIIcharacters. And the best part about these properties is that they, too, are versioned, justlike the textual contents of your files. You can modify, commit, and revert property changesas easily as you can file content changes. And the sending and receiving of property42