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https://issues.apache.org/jira/browse/SIS-422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16529821#comment-16529821
 ] 

Martin Desruisseaux commented on SIS-422:
-----------------------------------------

Last steps [proposed on the mailing 
list|https://lists.apache.org/thread.html/6adfb76225b195ff05474c786a3286217b5f2e1a7a10a0f372a07a6f@%3Cdev.sis.apache.org%3E]:

* [Tags|https://svn.apache.org/repos/asf/sis/tags/] cleanup:
** Rename {{0.2-incubating-rc4}} as {{0.2-incubating}}.
** Delete the other {{0.2-incubation-foo}} tags.
* [Branches|https://svn.apache.org/repos/asf/sis/branches/] cleanup:
** Delete branches 0.1 to 0.8 (development should use the tags if needed).
** Delete {{JDK9}} (work on this branch never really started).
** Delete the content of {{JDK8}} directory. Replace by a single {{README}} 
file giving the last revision number (so people can easily browse in the 
history) and a note saying that development moved to the {{geoapi-4.0}} branch 
on Git.
* [Trunk|https://svn.apache.org/repos/asf/sis/trunk/] termination:
** Delete the content of trunk directory. Replace by a single {{README}} file 
giving the last revision number (so people can easily browse in the history) 
and a note saying that development moved to the {{master}} branch on Git.


{panel:title=Proposed README content on trunk}
As of June 2018, Apache Spatial Information System (SIS) source code repository 
migrated from Subversion to Git. The new repository for SIS development is now 
https://gitbox.apache.org/repos/asf/sis - see http://sis.apache.org/source.html 
for more information.

Revision 1833333 contains the last commit on trunk. To see the last source code 
before migration to Git, use any of the following links:

* https://svn.apache.org/repos/asf/sis/trunk/?p=1833333
* http://svn.apache.org/viewvc/sis/trunk/?pathrev=1833333
{panel}


> Migrate from SVN to Git as the main SIS code repository
> -------------------------------------------------------
>
>                 Key: SIS-422
>                 URL: https://issues.apache.org/jira/browse/SIS-422
>             Project: Spatial Information Systems
>          Issue Type: Improvement
>            Reporter: Martin Desruisseaux
>            Assignee: Martin Desruisseaux
>            Priority: Major
>             Fix For: 1.0
>
>
> Migrate to git as the main source code repository. After this work:
> * The source code repository will become 
> https://gitbox.apache.org/repos/asf/sis.
> * The https://svn.apache.org/repos/asf/sis/trunk/ repository will become 
> read-only.
> We will continue to use Subversion for the {{site}}, {{sis-data}} and 
> {{non-free}}. Before to make the new git repository ready for use, we will 
> try to cleanup its history by removing large files, especially:
> * {{California_Restaurants.csv}} (19 Mb)
> * {{DEPARTEMENT.SHP}} (3 Mb)
> * {{ANC90Ply_4326.shp}} (0.7 Mb)
> Those large files were identified as below (source: 
> [stackoverflow|https://stackoverflow.com/questions/10622179/how-to-find-identify-large-files-commits-in-git-history]):
> {code:Bash}
> git rev-list --objects --all | sort -k 2 > allfileshas.txt
> git gc && git verify-pack -v .git/objects/pack/pack-*.idx | egrep "^\w+ 
> blob\W+[0-9]+ [0-9]+ [0-9]+$" | sort -k 3 -n -r > bigobjects.txt
> for SHA in `cut -f 1 -d\  < bigobjects.txt`; do
> echo $(grep $SHA bigobjects.txt) $(grep $SHA allfileshas.txt) | awk '{print 
> $1,$3,$7}' >> bigtosmall.txt
> done;
> {code}
> Commands executed for removing them:
> {code:Bash}
> git filter-branch --tree-filter 'find . -name "California_Restaurants.csv" 
> -delete' -- --all
> git filter-branch --tree-filter 'find . -name "DEPARTEMENT.*" -delete' -- 
> --all
> git filter-branch --tree-filter 'find . -name "ANC90Ply_4326*" -delete' -- 
> --all
> git filter-branch --tree-filter 'find . -name "*~" -delete' -- --all
> git filter-branch --tree-filter 'rm -rf "sis-data"' -- --all
> git update-ref -d refs/original/refs/heads/master
> git reflog expire --expire=now --all
> git gc --prune=now
> {code}



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