svn to git/github migration with svdump/svnrdump and svndumpfilter

svn2github_migration_with_taking_dump.sh

# PROBLEM:
#
# bash-3.2$ git remote add origin git@github.com:AtlasOfLivingAustralia/ecodata.git
# bash-3.2$ git push origin --all
# Counting objects: 6216, done.
# Delta compression using up to 4 threads.
# Compressing objects: 100% (3094/3094), done.
# Writing objects: 100% (6216/6216), 5.01 MiB | 1.24 MiB/s, done.
# Total 6216 (delta 3011), reused 2195 (delta 907)
# remote: error: GH001: Large files detected.
# remote: error: Trace: f783125ec9eea68ed1cf360875aa0590
# remote: error: See http://git.io/iEPt8g for more information.
# remote: error: File target/stacktrace.log is 353.79 MB; this exceeds GitHub's file size limit of 100 MB
# remote: error: File target/stacktrace.log is 353.29 MB; this exceeds GitHub's file size limit of 100 MB
# To git@github.com:AtlasOfLivingAustralia/ecodata.git
# ! [remote rejected] master -> master (pre-receive hook declined)
# ! [remote rejected] trunk -> trunk (pre-receive hook declined)
# error: failed to push some refs to 'git@github.com:AtlasOfLivingAustralia/ecodata.git'
# bash-3.2$
#

# first take a dump
mbohun@firewolf:~/src> svnrdump dump http://ala-fieldcapture.googlecode.com/svn > svn_ala-fieldcapture.dump
#
# [...]
#
# * Dumped revision 1696.
# * Dumped revision 1697.
# * Dumped revision 1698.
# * Dumped revision 1699.
# mbohun@firewolf:~/src> cp svn_ala-fieldcapture.dump svn_ala-fieldcapture.dump.bak
# mbohun@firewolf:~/src> ls -lah svn_ala-fieldcapture.dump
# -rw-r--r-- 1 mbohun users 369M Jul 10 21:20 svn_ala-fieldcapture.dump

# use svndumpfilter to remove the 353.79mb stacktrace.log from the dump
mbohun@firewolf:~/src> svndumpfilter exclude --pattern "*/stacktrace.log" < svn_ala-fieldcapture.dump > svn_ala-fieldcapture-without-stacktrace_log.dump
# Excluding prefix patterns:
#    '/*/stacktrace.log'
# 
# Revision 0 committed as 0.
# Revision 1 committed as 1.
# Revision 2 committed as 2.
# Revision 3 committed as 3.
# Revision 4 committed as 4.
# Revision 5 committed as 5.
# Revision 6 committed as 6.
# [...]
#
# Revision 1696 committed as 1696.
# Revision 1697 committed as 1697.
# Revision 1698 committed as 1698.
# Revision 1699 committed as 1699.
# 
# Dropped 1 node:
#    '/trunk/ecodata/target/stacktrace.log'
# 
# mbohun@firewolf:~/src>

# a simplistic verification
mbohun@firewolf:~/src> ls -lah *.dump
# -rw-r--r-- 1 mbohun users 369M Jul 10 21:20 svn_ala-fieldcapture.dump
# -rw-r--r-- 1 mbohun users  15M Jul 11 10:29 svn_ala-fieldcapture-without-stacktrace_log.dump

# create a (tmp) svn repo to import/load our filtered version of our dump
mbohun@firewolf:~/src> svnadmin create svn_ala-fieldcapture-local

# load the filtered dump
mbohun@firewolf:~/src> svnadmin load ./svn_ala-fieldcapture-local < svn_ala-fieldcapture-without-stacktrace_log.dump

# svnserve the new repo
mbohun@firewolf:~/src> svnserve -d -r ./svn_ala-fieldcapture-local

# ...and we are ready to migrate to git/github
mbohun@firewolf:~/src> git svn clone svn://localhost --tags=tags --authors-file=./authors-file.out --trunk=trunk/ecodata -s ecodata.git

# ...resuming our interrupted migration:
mbohun@firewolf:~/src> cd ecodata.git
mbohun@firewolf:~/src/ecodata.git> git for-each-ref refs/remotes/tags | cut -d / -f 4- | grep -v @ | while read tagname; do git tag "$tagname" "tags/$tagname"; git branch -r -d "tags/$tagname"; done
mbohun@firewolf:~/src/ecodata.git> git for-each-ref refs/remotes | cut -d / -f 3- | grep -v @ | while read branchname; do git branch "$branchname" "refs/remotes/$branchname"; git branch -r -d "$branchname"; done
mbohun@firewolf:~/src/ecodata.git> git remote add origin git@github.com:AtlasOfLivingAustralia/ecodata.git
mbohun@firewolf:~/src/ecodata.git> git push origin --all
mbohun@firewolf:~/src/ecodata.git> git push origin --tags

# done :-)