|Version Management with CVS - the CVS manual|
by Per Cederqvist et al.
Paperback (6"x9"), 216 pages, 8 figures
RRP £19.95 ($29.95)
D The CVS directory
This chapter describes the internal ‘CVS’ directories created by CVS. Information is stored in these directories in the working directory and the repository.
17.8 The CVS directory in the working directory
Each checked-out working directory contains an additional ‘CVS’ directory, which is internal to CVS. As with the repository,
CVS takes care of this information and one can usually
access it via CVS commands. But in some cases it
may be useful to look at it, and other client programs, such
jCVS(8) graphical user interface or the
VC package for emacs, may need to look at it.
Such programs should follow the recommendations in this
section if they hope to be able to work with other
programs which use those files, including future
versions of the programs just mentioned and the
command-line CVS client.
The ‘CVS’ directory contains several files. Programs which are reading this directory should silently ignore files which are in the directory but which are not documented here, to allow for future expansion.
The files are stored according to the text file convention for the system in question. This means that working directories are not portable between systems with differing conventions for storing text files. This is intentional, on the theory that the files being managed by CVS probably will not be portable between such systems either.
- This file contains the current CVS root, as described in section 2.1 Telling CVS where your repository is.
This file contains the directory within the repository
which the current directory corresponds with. It can
be either an absolute pathname or a relative pathname;
CVS has had the ability to read either format
since at least version 1.3 or so. The relative
pathname is relative to the root, and is the more
sensible approach, but the absolute pathname is quite
common and implementations should accept either. For
example, after the command
$ cvs -d :local:/usr/local/cvsroot checkout yoyodyne/tc‘Root’ will contain
:local:/usr/local/cvsrootand ‘Repository’ will contain either
yoyodyne/tcIf the particular working directory does not correspond to a directory in the repository, then ‘Repository’ should contain ‘CVSROOT/Emptydir’.
This file lists the files and directories in the
The first character of each line indicates what sort of
line it is. If the character is unrecognized, programs
reading the file should silently skip that line, to
allow for future expansion.
If the first character is ‘/’, then the format is:
/name/rev/timestamp[+conflict]/options/tagdatewhere ‘[’ and ‘]’ are not part of the entry, but instead indicate that the ‘+’ and conflict marker are optional. name is the name of the file within the directory. rev is the revision that the file in the working derives from, or ‘0’ for an added file, or ‘-’ followed by a revision for a removed file. timestamp is the timestamp of the file at the time that CVS created it; if the timestamp differs with the actual modification time of the file it means the file has been modified. It is stored in the format used by the ISO C asctime() function (for example, ‘Sun Apr 7 01:29:26 1996’). One may write a string which is not in that format, for example, ‘Result of merge’, to indicate that the file should always be considered to be modified. This is not a special case; to see whether a file is modified a program should take the timestamp of the file and simply do a string compare with timestamp. If there was a conflict, conflict can be set to the modification time of the file after the file has been written with conflict markers (see section 10.3 Conflicts example). Thus if conflict is subsequently the same as the actual modification time of the file it means that the user has obviously not resolved the conflict. options contains sticky options (for example ‘-kb’ for a binary file). tagdate contains ‘T’ followed by a tag name, or ‘D’ for a date, followed by a sticky tag or date. Note that if timestamp contains a pair of timestamps separated by a space, rather than a single timestamp, you are dealing with a version of CVS earlier than CVS 1.5 (not documented here). The timezone on the timestamp in CVS/Entries (local or universal) should be the same as the operating system stores for the timestamp of the file itself. For example, on Unix the timestamp of the file is in universal time (UT), so the timestamp in CVS/Entries should be too. On VMS, the timestamp of the file is in local time, so CVS on VMS should use local time. This rule is so that files do not appear to be modified merely because the timezone changed (for example, to or from summer time). If the first character of a line in ‘Entries’ is ‘D’, then it indicates a subdirectory. ‘D’ on a line all by itself indicates that the program which wrote the ‘Entries’ file does record subdirectories (therefore, if there is such a line and no other lines beginning with ‘D’, one knows there are no subdirectories). Otherwise, the line looks like:
D/name/filler1/filler2/filler3/filler4where name is the name of the subdirectory, and all the filler fields should be silently ignored, for future expansion. Programs which modify
Entriesfiles should preserve these fields. The lines in the ‘Entries’ file can be in any order.
- This file does not record any information beyond that in ‘Entries’, but it does provide a way to update the information without having to rewrite the entire ‘Entries’ file, including the ability to preserve the information even if the program writing ‘Entries’ and ‘Entries.Log’ abruptly aborts. Programs which are reading the ‘Entries’ file should also check for ‘Entries.Log’. If the latter exists, they should read ‘Entries’ and then apply the changes mentioned in ‘Entries.Log’. After applying the changes, the recommended practice is to rewrite ‘Entries’ and then delete ‘Entries.Log’. The format of a line in ‘Entries.Log’ is a single character command followed by a space followed by a line in the format specified for a line in ‘Entries’. The single character command is ‘A’ to indicate that the entry is being added, ‘R’ to indicate that the entry is being removed, or any other character to indicate that the entire line in ‘Entries.Log’ should be silently ignored (for future expansion). If the second character of the line in ‘Entries.Log’ is not a space, then it was written by an older version of CVS (not documented here). Programs which are writing rather than reading can safely ignore ‘Entries.Log’ if they so choose.
- This is a temporary file. Recommended usage is to write a new entries file to ‘Entries.Backup’, and then to rename it (atomically, where possible) to ‘Entries’.
The only relevant thing about this file is whether it
exists or not. If it exists, then it means that only
part of a directory was gotten and CVS will
not create additional files in that directory. To
clear it, use the
updatecommand with the ‘-d’ option, which will get the additional files and remove ‘Entries.Static’.
- This file contains per-directory sticky tags or dates. The first character is ‘T’ for a branch tag, ‘N’ for a non-branch tag, or ‘D’ for a date, or another character to mean the file should be silently ignored, for future expansion. This character is followed by the tag or date. Note that per-directory sticky tags or dates are used for things like applying to files which are newly added; they might not be the same as the sticky tags or dates on individual files. For general information on sticky tags and dates, see section 4.9 Sticky tags.
This file stores notifications (for example, for
unedit) which have not yet been sent to the server. Its format is not yet documented here.
- This file is to ‘Notify’ as ‘Entries.Backup’ is to ‘Entries’. That is, to write ‘Notify’, first write the new contents to ‘Notify.tmp’ and then (atomically where possible), rename it to ‘Notify’.
If watches are in use, then an
editcommand stores the original copy of the file in the ‘Base’ directory. This allows the
uneditcommand to operate even if it is unable to communicate with the server.
The file lists the revision for each of the files in
the ‘Base’ directory. The format is:
Bname/rev/expansionwhere expansion should be ignored, to allow for future expansion.
- This file is to ‘Baserev’ as ‘Entries.Backup’ is to ‘Entries’. That is, to write ‘Baserev’, first write the new contents to ‘Baserev.tmp’ and then (atomically where possible), rename it to ‘Baserev’.
- This file contains the template specified by the ‘rcsinfo’ file (see section B.5 Rcsinfo). It is only used by the client; the non-client/server CVS consults ‘rcsinfo’ directly.
|ISBN 0954161718||Version Management with CVS - the CVS manual||See the print edition|