Rational ClearCase Commands Referenceannotate
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DESCRIPTION
The clearexport_cvs command processes Concurrent Versions Systems (CVS) files so they can be imported into ClearCase or ClearCase LT elements and versions. The source data can range from a single file to an entire directory tree.
During the export stage, you invoke clearexport_cvs in the area where the CVS files reside. clearexport_cvs creates a datafile (by default, named cvt_data) and places in it descriptions of elements, branches, and versions. clearexport_cvs follows symbolic links it encounters during the export stage.
In the import stage, you invoke clearimport on the datafile to import information into the new VOB.
clearexport_cvs ignores most information in CVS files that is not related to version-tree structure. clearexport_cvs converts each CVS symbol, which names a revision or branch, into the appropriate construct: version label or branch. You can specify a translation file to control naming, enforcing consistency over multiple invocations of clearexport_cvs. You can use the –S and –V options to preserve CVS state attributes and CVS revision numbers as attributes of the corresponding ClearCase or ClearCase LT versions. The –A option enables you to export CVS Attic subdirectories if you choose to recursively descend source_name arguments that specify directories.
clearexport_cvs and clearimport use magic files to determine which element type to use for each element clearimport creates. For more information about magic files and file typing, see the cc.magic reference page.
Note: You cannot run clearexport_cvs on UNIX and then run clearimport on Windows to import the data, or vice versa. However, you can transfer data in either direction between UNIX and Windows by mounting the UNIX VOB or file system on the Windows machine and running both clearexport_cvs and clearimport on the Windows machine.
CVS Files, Working Files, and Locks
clearexport_cvs works directly with the structured CVS files. It does not process the working files created with co and co –l commands. Be sure to check in working files with the ci command before running the exporter. clearexport_cvs issues warning messages when it encounters checked-out files, but it still processes them.
clearexport_cvs ignores all CVS locks.
CVSROOT Environment Variable
You must set the environment variable CVSROOT for the cvs command to work. If, for example, CVSROOT is set to /usr/src/cvs and an element archive is found in the CVS repository as /usr/src/cvs/gui/windows/main.cxxx,v, then an extraction command for a version of the element would look like this:
cvs get –Q –p –r1.1 gui/windows/main.cxx
Special Characters in File Names
During import, clearimport invokes a shell to extract data from the datafile. clearimport can handle some, but not all, characters that are special to shells. Import fails for any file name that includes any of these characters:
For example:
Before running clearexport_cvs, rename any file whose name contains these characters.
Note: If you specify datafile-pname or source-name and any of the names include spaces, you must escape the space characters (UNIX) or enclose the name in double quotes (Windows). For example, on UNIX systems:
% clearexport_cvs src\files
On Windows systems:
Handling of CVS Symbols
A CVS symbol is a mnemonic name for a particular revision or branch of a CVS file. clearexport_cvs translates the symbols to version labels and branch names (more precisely, to names of label types and branch types).
- Translation to version labels. Suppose a CVS symbol, RLS_1.3, names a revision, 3.5. clearexport_cvs places a description of label type RLS_1.3 in the datafile, and clearimport imports that label type and assigns a label of that type to the version created from the CVS revision.
- Handling of magic branches. When clearexport_cvs encounters a magic branch with a symbolic name in a CVS archive, it determines whether any versions have been checked in on that branch. If there are any, the magic branch's symbolic name is used as the name of the ClearCase or ClearCase LT branch; otherwise, the branch is ignored.
- Translation to branch names. Suppose a CVS symbol, rls_1.3_fixes, names a branch 3.5.1. clearexport_cvs outputs a description of branch type rls_1.3_fixes, and clearimport creates a branch of that type at the ClearCase or ClearCase LT version created from CVS revision 3.5.
Because there is no concept of a subbranch of the main branch, clearexport_cvs does not process single-digit symbols that name CVS branches. If a CVS symbol includes characters that are not valid in names of label types or branch types, clearexport_cvs replaces the offending name. For example, the CVS symbol C++ can be renamed to “C..”.
A label type cannot have the same name as a branch type within the same VOB. If the same CVS symbol names both a revision and a branch—not necessarily in the same CVS file—clearexport_cvs renames one of them. For example, after exporting a symbol FX354, which names a branch, it may encounter the same symbol as the name of a revision in another CVS file. In this case, it creates label type FX354_1.
Translation File
This renaming of CVS symbols can introduce inconsistencies over multiple runs of clearexport_cvs. The same symbol may be renamed during processing of some CVS files, but not change during processing of other files. You can enforce consistency by using the same translation file in multiple invocations of clearexport_cvs. If you name such a file, using the –T option, clearexport_cvs uses it as follows:
- To look up each CVS symbol to see how to translate it to a label type or branch type. If a match is found, the symbol is translated the same way.
- To record each translation of a new CVS symbol for use in future lookups.
The first time you use clearexport_cvs, use –T to create a new translation file. On subsequent invocations of clearexport_cvs, use –T again, specifying the same translation file for consistent name translation.
The translation file consists of one or more lines in the following form:
For example, to rename the branch type pre_import_work to post_import_work and the label BL1.7 to IMPORT_BASE, the translation file contains the lines:
No blank lines are allowed in the file.
Handling of Objects That Cannot Be Exported
When clearexport_cvs encounters a file or directory that cannot be exported (for example, a file with format problems or a broken symbolic link), it prints an error and continues. After creating the data file, the command prints a summary of the files and directories that could not be exported.
OPTIONS AND ARGUMENTS
Handling of Directory Arguments
- Default
- If you specify a directory as a source-name argument:
(1) clearexport_cvs processes the files in that directory
but ignores the contents of the subdirectories; (2) clearimport creates
a directory element for source-name and for each
of its subdirectories.
- –r
- clearexport_cvs descends
recursively into all source-name arguments that
are directories.
Selective Conversion of Files
- Default
- clearexport_cvs processes
all CVS revisions it finds.
- –s date-time
- clearexport_cvs processes
only CVS revisions that have been modified since the time specified. Use this
option for regular, incremental updating of an element from a CVS file that
is still under development. Be sure to specify a date-time that
covers the entire period since the preceding update. In other situations,
it is probably better to use –I instead of –s.
clearexport_cvs determines whether to process a CVS archive by using the last-modified date/time of the archive. If this date/time is before the date-time you specify with –s, clearexport_cvs does not process any of the revisions in the archive. If the archive's date/time is after the date-time you specify, clearexport_cvs processes the following revisions in the archive:
- All revisions created since the specified date-time
- All revisions that have labels
- All revisions from which branches sprout
Note: In an incremental updating situation, if you remove a label or branch from a CVS revision, clearimport does not remove the label or branch from the element.
- All revisions created since the specified date-time
- –p date-time
- Like -s, but processes
only versions modified with new metadata (labels, branches, attributes, and
so on) or created prior to the specified time.
- –I { now | date-time }
- Processes important revisions only,
but includes all revisions created since the specified time. A revision is
important if any of these conditions is true:
- It is the most recent version on its branch.
- It has a label.
- A subbranch is sprouted from it.
Specify the time in one of the following formats:
date.time | date | time | now where:
Specify time in 24-hour format, relative to the local time zone. If you omit the time, the default value is 00:00:00. If you omit date, the default is today. If you omit the century, year, or a specific date, the most recent one is used. Specify UTC if you want to resolve the time to the same moment in time regardless of time zone. Use the plus (+) or minus (-) operator to specify a positive or negative offset to the UTC time. If you specify UTC without hour or minute offsets, Greenwich Mean Time (GMT) is used. (Dates before January 1, 1970 Universal Coordinated Time (UTC) are invalid.)
- It is the most recent version on its branch.
Preservation of CVS Information as Attributes
- Default
- clearexport_cvs does
not attach attributes to versions exported from CVS revisions.
- –V
- Attaches an attribute of type CVS_REVISION to
each newly created version. The string value of the attribute is the CVS revision
number of the exported revision. (clearimport creates
attribute type CVS_REVISION, if necessary.)
If you use the –s option with this option, clearimport attaches CVS_REVISION attributes only to revisions created after the date-time you specified.
Each attribute requires about 1 KB of storage in the VOB database.
- –S
- If a CVS revision's state is not
the default (Exp), attaches an attribute of type CVS_STATE to
the newly created version. The string value of the attribute is the CVS state
attribute of the exported revision.
- –A
- Specifies that files found in CVS Attic subdirectories
are to be exported as if they were part of the main repository directory.
For example, the CVS file, ./proj/Attic/main.c,v is exported
as the element ./proj/main.c.
Directory for Temporary Files
- Default
- On UNIX systems, the value of P_tmpdir (set
in the stdio.h system include file; you can override
this value by setting the TMPDIR environment
variable).
On Windows systems, the value of the TMP environment variable.
- –t temp-dir-pname
- Specifies an alternate directory
for temporary files. This directory must already exist.
Handling of Branches and Labels.
- Default
- As described in the section “Handling
of CVS Symbols” clearexport_cvs may
rename a branch or label type to avoid naming conflicts.
- –T translation-file
- Uses the specified translation file
to control and record the conversion of CVS symbols to version labels and
branch names.
Storage Location of Datafile
Specifying Files to Be Exported
- Default
- clearexport_cvs processes
the current working directory (equivalent to specifying a dot ( . ) as the source-name argument).
If you specify a directory as a source-name argument:
(1) clearexport_cvs processes the files in that directory
but ignores the contents of the subdirectories; (2) clearimport creates
a directory element for source-name and for each
of its subdirectories (except one named CVS or cvs).
- source-name ...
- One or more pathnames, specifying
CVS files and/or directories:
- For each specified CVS file, clearexport_cvs places
a description in the datafile.
- For each specified directory, clearexport_cvs places
descriptions in the datafile for each of the CVS
files it contains. clearimport creates
a directory element for the specified directory itself, and for its subdirectories
(except one named CVS).
Each source-name can be a simple file or directory name or a wildcard as described in wildcards_ccase. Specifying a parent directory (..) causes an error, as does any UNIX pathname that includes a slash or any Windows pathname that includes a slash or backslash. Run this command in a directory under which the elements to be exported reside. If the CVS files reside in CVS subdirectories, use the –r option to enable clearexport_cvs to find them.
- For each specified CVS file, clearexport_cvs places
a description in the datafile.
SEE ALSO
cc.magic, clearexport_*, clearimport, cvs(1), events_ccase, relocate, rsh(1) or remsh(1), sccs(1), wildcards_ccase