Skrync

(This is a project in progress)

My file synchronization tool.

Goals

1. Save the state of all files recursively from a root directory: size and MD5 or SHA1, date, attributes
   • As a file ✔️
   • Automatically generating a descriptive, dated filename ✔️
   • Showing progress ✔️
   • Interruptable and resumable.
2. Print some statistics on the files that were discovered.
   • Number of files.
   • Largest files that have duplicates.
   • Largest directories that have duplicates.
3. Compare two states to find the differences.
   • Equals only. ✔️
   • Info.
   • New files. ✔️
   • Deleted files. ✔️
   • Moved and/or renamed.
   • Copied...?
4. Rectify the differences. ❌ (not started)
   • Progress
   • Copy new files from source to destination.
   • Move files in the destination.
   • Delete files.
   • Log and/or stash all changes that would lose data in the destination.

# Create with default name (media_username_MYDISK__20210101120000).
# Unlikely that it exists already due to the timestamp.
skrync digest --srcDir /media/username/MYDISK/backup \
    --dstDigest /media/username/MYDISK/.skrync/
skrync digest --srcDir /media/username/MYDISK2/backup \
    --dstDigest /media/username/MYDISK2/.skrync/

# Dry run it (produces a plan)
skrync compare \
    --srcDigest \
    /media/username/MYDISK/backup/.skrync/media_username_MYDISK__20210101120000 \
    --dstDigest \
    /media/username/MYDISK2/backup/.skrync/media_username_MYDISK2__20210101120010

# Do it.
skrync execute --srcDigest \
    /media/username/MYDISK/backup/.skrync/media_username_MYDISK__20210101120000 \
    --dstDigest \
    /media/username/MYDISK2/backup/.skrync/media_username_MYDISK2__20210101120010 \
    --backup /tmp/skrync_changed/
skrync execute --plan /tmp/todo/plan.json --backup /tmp/changed/

Running the launcher

mvn package
# Using the fat jar
alias skrync='java -jar '$(pwd)'/target/skrync*-SNAPSHOT.jar'
skrync --help