How to Convert a sizable SVN repository to Git

Seamlessly Transitioning Your Large SVN Repository

Converting an extensive SVN repository with more than 155,000 changes to Git is a difficult but necessary step in updating your version control system. By utilizing svn2git on a Red Hat Linux system, you can guarantee the most effective conversion procedure. To handle new commits during the migration and to periodically sync the SVN repository, a transition strategy must be put in place.

You can reduce downtime and preserve continuity with this method. Managing huge binary files is a major challenge in this procedure, however Git LFS and BFG Repo Cleaner can help. In this section, we'll examine the tactics and fixes for a seamless migration that won't interfere with the daily operations of your team.

Understanding the Migration Process

The process of converting a sizable SVN repository to Git is automated by the supplied scripts. The first script is a bash script meant to run on a Linux computer as a cron job. It uses svnsync sync to synchronize the local SVN repository with the remote on a regular basis. Next, it uses svn-all-fast-export --resume-from to convert the new SVN revisions to Git commits. For consistency between syncs, the script records the most recent SVN revision that was converted. Ultimately, it pushes the modifications to the remote repository and updates the local Git repository.

The transfer of binary files to Git LFS is managed by the second script. It tracks binary files with git lfs track, initializes Git LFS in the repository, and commits these changes. The script migrates existing binaries to LFS using the BFG Repo Cleaner, which is called with java -jar $BFG_JAR --convert-to-git-lfs. After that, it uses git gc --prune=now --aggressive for garbage collection to tidy up the repository and pushes the modified history to the remote. With this script, you can be confident that big binary files are handled effectively in the Git repository without taking up too much space in the history.

#!/bin/bash
# Variables
SVN_REPO_URL="http://your-svn-repo-url"
SVN_LOCAL_DIR="/path/to/local/svn"
GIT_REPO_DIR="/path/to/local/git"
LOG_FILE="/path/to/log/file"

# Sync SVN repo
svnsync sync file://$SVN_LOCAL_DIR

# Convert new revisions to Git
LAST_REV=$(tail -n 1 $LOG_FILE)
svn-all-fast-export --resume-from=$LAST_REV $SVN_LOCAL_DIR --rules rules.txt --add-metadata --identity-map users.txt

# Update Git repo
cd $GIT_REPO_DIR
git pull
git push

# Log last revision
svn info $SVN_LOCAL_DIR | grep "Revision:" | awk '{print $2}' >> $LOG_FILE

#!/bin/bash
# Variables
GIT_REPO_DIR="/path/to/local/git"
BFG_JAR="/path/to/bfg.jar"

# Initialize Git LFS
cd $GIT_REPO_DIR
git lfs install

# Add binary files to Git LFS tracking
git lfs track "*.bin"
git add .gitattributes
git commit -m "Track binary files with LFS"

# Use BFG to migrate binaries to LFS
java -jar $BFG_JAR --convert-to-git-lfs '*.bin' --no-blob-protection

# Cleanup and push changes
git reflog expire --expire=now --all
git gc --prune=now --aggressive
git push origin --force --all
git push origin --force --tags

Efficient Transition Plans for Big SVN to Git Conversions

To prevent interruptions, it is essential to plan for a seamless transition when converting a sizable SVN repository to Git. Temporarily implementing a dual repository system is a successful approach. SVN and Git repositories are synchronized in this system while the migration is happening. Teams are able to work with minimum disruptions as SVN updates are periodically synchronized with Git.

Managing big binary files is another crucial factor to take into account. Maintaining a tidy and effective Git repository is made easier with the use of programs like BFG Repo Cleaner and Git LFS. Early in the process, planning the migration of these files will guarantee that the history is free of big binaries that can impede operations and keep the repository manageable.

How to Execute a Smooth SVN to Git Migration

The process of converting a sizable SVN repository to Git is automated by the supplied scripts. The first script is a bash script meant to run on a Linux computer as a cron job. It uses svnsync sync to synchronize the local SVN repository with the remote on a regular basis. Next, it uses svn-all-fast-export --resume-from to convert the new SVN revisions to Git commits. For consistency between syncs, the script records the most recent SVN revision that was converted. Ultimately, it pushes the modifications to the remote repository and updates the local Git repository.

The transfer of binary files to Git LFS is managed by the second script. It tracks binary files with git lfs track, initializes Git LFS in the repository, and commits these changes. The script migrates existing binaries to LFS using the BFG Repo Cleaner, which is called with java -jar $BFG_JAR --convert-to-git-lfs. After that, it uses git gc --prune=now --aggressive for garbage collection to tidy up the repository and pushes the modified history to the remote. With this script, you can be confident that big binary files are handled effectively in the Git repository without taking up too much space in the history.