Clearcase to Git

A tool to extract relevant meta-data from clearcase, (and save this representation), then build change set, and output this to git-fast-import.

There are samples of actual use in the scripts directory

General principle :

• export as much as possible using clearexport_ccase (in several parts due to memory constraints of clearexport_ccase)
• get all elements (files and directories)
• optionally edit these lists to exclude uninteresting ones
• use GitImporter (which calls cleartool) to create (and save) a representation of the Vob
• import with GitImporter and git fast-import, cleartool is then used only to get the content of files

FOR /D %D in (*) DO clearexport_ccase -r -o %D.export %D

cleartool find -all -type d -print >directories.lst
cleartool find -all -type f -print >files.lst

GitImporter -S:vobDB.bin -E:files.lst -D:directories.lst -G -C:M:\MyView\MyVob *.export

GitImporter -L:vobDB.bin -C:M:\MyView\MyVob | git fast-import

Thirdparties

There is support for thirdparties to be handled as git submodules, using a specific configuration file.

It assumes that there is a special file that stores the clearcase config-spec, with label rules for some directories. Then for each new version of this file, if a match is found for a directory and a label, the corresponding commit of the submodule will be referenced.

As far as thirdparties are concerned, I went to a NuGet-based solution instead, but old commits still refer the submodules.