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The Changelog

3.1

The Container Release

The premise of this release was to focus on adding better support for Docker container instances of Pi-hole. This release also changes a lot of things about the requirements that Gravity Sync has always had, which were not running as the root user, and requiring that the script be run from the user's home directory. Those two restrictions are gone.

You can now use a standard Pi-hole install as your primary, or your secondary. You can use a Docker install of Pi-hole as your primary, or your secondary. You can mix and match between the two however you choose. You can have Pi-hole installed in different directories at each side, either as standard installs or with container configuration files in different locations. Overall it's much more flexible.

Docker Support

  • Only the official Pi-hole managed Docker image is supported. Other builds may work, but they have not been tested.
  • If you are using a name for your container other than the default pihole in your Docker configuration, you must specify this in your gravity-sync.conf file.
  • Smart Sync, and the associated push/pull operations, now will send exec commands to run Pi-hole restart commands within the Docker container.
  • Your container configuration must expose access to the virtual /etc/pihole location to the host's file system, and be configured in your gravity-sync.conf file.

Example: if your container configuration looked something like like -v /home/vmstan/etc-pihole/:/etc/pihole then the location /home/vmstan/etc-pihole would need to be accessible by the user running Gravity Sync, and be configured as the PIHOLE_DIR (or RIHOLE_DIR) in your gravity-sync.conf file.

Installation Script

  • Detects the running instance of default Pi-hole Docker container image, if standard Pi-hole lookup fails. Pi-hole must still be installed prior to Gravity Sync.
  • Changes detection of root vs sudo users, and adapts commands to match. You no longer need to avoid running the script as root.
  • Only deploys passwordless SUDO components if deemed necessary. (i.e. Not running as root.)
  • Now automatically runs the local configuration function on the secondary Pi-hole after execution.
  • Deploys script via git to whatever directory the installer runs in, instead of defaulting to the user's $HOME directory.
  • Gravity Sync no longer requires that it be run from the user's $HOME directory.

Configuration Workflow

  • Overall, a simpler configuration function, as the online installer now checks for the dependencies prior to execution.
  • New users with basic Pi-hole installs will only be prompted for the address of the primary (remote) Pi-hole, an SSH user and then the SSH password to establish a trusted relationship and share the keyfiles.
  • Automatically prompts on during setup to configure advanced variables if a Docker installation is detected on the secondary (local) Pi-hole.
  • Advanced users can set more options for non-standard deployments at installation. If you are using a Docker deployment of Pi-hole on your primary (remote) Pi-hole, but not the system running Gravity Sync, you will need to enter this advanced mode when prompted.
  • Existing users with default setups should not need to run the config utility again after upgrading, but those with custom installs (especially existing container users) should consider it to adopt new variable names and options in your config files.
  • Creates a BASH environment alias to run the command gravity-sync from anywhere on the system. If you use a different shell (such as zsh or fish) as your default this may need to be added manually.

New Variables

  • REMOTE_FILE_OWNER variable renamed RILE_OWNER for consistency.
  • RIHOLE_DIR variable added to set different Pi-hole directory for remote host than local.
  • DOCKER_CON and ROCKER_CON variables added to specify different names for local and remote Pi-hole Docker containers.
  • PH_IN_TYPE and RH_IN_TYPE variables allow you to to either standard or Docker deployments of Pi-hole, per side.
  • DOCKER_BIN and ROCKER_BIN variables allow you to set non-standard locations for Docker binary files, per side.
  • Adds all variables to gravity-sync.conf.example for easy customization.

Removals

  • Support for sshpass has been removed, the only valid authentication method going forward will be ssh-key based.
  • If you've previously configured Gravity Sync using sshpass you will need to run ./gravity-sync.sh config again to create a new configuration file.

Bug Killer

  • Lots of long standing little buggles have been squashed.

Branding

  • I made a logo.

Gravity Sync

3.0

The Breakout Release

This release focuses on breaking out elements of the script from the main file into a collection of a dozen or so files located under the includes/gs-*.sh hirearchy. Seperating out allows new contributors to work on different parts of the script individually, provides an oppertunity to clean up and reorganize parts of the code, and hopefully provides less risk of breaking the entire script.

This release also features a brand new installation script, including a host check for both the primary and secondary Pi-hole system. This should reduce frustration of users who are missing parts of the system requirements. This will also place a file in the sudoers.d file on both systems to make sure passwordless sudo is configured as part of the installation.

Lastly, we adopts Pi-hole style iconography such as ✓ ✗ e ! ? instead of [ GOOD ] in command output.

Enjoy!

3.0.1

  • dev function now automatically updates Gravity Sync after application.
  • dev function pulls new branches down before prompting to select which one to update against.
  • Minor shuffle of gravity-sync.sh contents.
  • Clarify installation requirements in README.md.
  • Fixes issues with permissions on gravity.db after push operations.
  • Fixes missing script startup output during dev operation.

3.0.2

  • Realigned EPS conduits, they overheat if you leave them pointed the same way for too long.
  • Corrected error when running via crontab where includes directory was not properly sourced.

2.2

The Purged Release

This release removes support for Dropbear SSH client/server. If you are using this instead of OpenSSH (common with DietPi) please reconfigure your installation to use OpenSSH. You will want to delete your existing ~/.ssh/id_rsa and ~/.ssh/id_rsa.pub files and run ./gravity-sync.sh configure again to generate a new key and copy it to the primary Pi-hole.

This release also adds the ./gravity-sync.sh purge function that will totally wipe out your existing Gravity Sync installation and reset it to the default state for the version you are running. If all troubleshooting of a bad installation fails, this is the command of last resort.

  • Updates the remote backup timeout from 15 to 60, preventing the gravity.db backup on the remote Pi-hole from failing. (PR #76)
  • Adds uninstall instructions to the README.md file. (Basically, run the new purge function and then delete the gravity-sync folder.)
  • I found a markdown spellcheck utility for Visual Studio Code, and ran it against all my markdown files. I'm sorry, I don't spell good. 🤷‍♂️
  • New Star Trek references.

2.2.1

  • Corrects issue with Smart Sync where it would fail if there was no custom.list already present on the local Pi-hole.
  • Adds Pi-hole default directories to gravity-sync.conf.example file.
  • Adds RIHOLE_BIN variable to specify different Pi-hole binary location on remote server.

2.2.2

  • Corrects another logical problem that prevented custom.list from being backed up and replicated, if it didn't already exist on the local Pi-hole.

2.2.3

  • Adds variable to easily override database/binary file owners, useful for container deployments. (Thanks @dpraul)
  • Adds variable to easily override Pi-hole binary directory for remote host, seperate from local host. (Thanks @dpraul)
  • Rewritten dev option now lets you select the branch to pull code against, allowing for more flexibility in updating against test versions of the code. The beta function introduced in 2.1.5 has now been removed.
  • Validates existance of SQLite installation on local Pi-hole.
  • Adds Gravity Sync permissions for running user to local /etc/sudoer.d file during config operation.
  • Adds ./gravity-sync.sh sudo function to create above file for existing setups, or to configure the remote Pi-hole by placing the installer files on that system. This is not required for existing functional installs, but this should also negate the need to give the Gravity Sync user NOPASSWD permissions to the entire system.

2.1

The Backup Release

A new function ./gravity-sync.sh backup will now perform a SQLITE3 operated backup of the gravity.db on the local Pi-hole. This can be run at any time you wish, but can also be automated by the ./gravity-sync.sh automate function to run once a day. New and existing users will be prompted to configure both during this task. If can also disable both using the automate function, or just automate one or the other, by setting the value to 0 during setup.

New users will automatically have their local settings backed up after completion of the initial setup, before the first run of any sync tasks.

By default, 7 days worth of backups will be retained in the backup folder. You can adjust the retention length by changing the BACKUP_RETAIN function in your gravity-sync.conf file. See the ADVANCED.md file for more information on setting these custom configuration options.

There are also enhancements to the ./gravity-sync.sh restore function, where as previously this task would only restore the previous copy of the database that is made during sync operations, now this will ask you to select a previous backup copy (by date) and will use that file to restore. This will stop the Pi-hole services on the local server while the task is completed. After a successful restoration, you will now also be prompted to perform a push operation of the restored database to the primary Pi-hole server.

It's suggested to make sure your local restore was successful before completing the restore operation with the push job.

Dropbear Notice

Support for the the Dropbear SSH client/server (which was added in 1.7.6) will be removed in an upcoming version of Gravity Sync. If you are using this instead of OpenSSH (common with DietPi) please reconfigure your installation to use OpenSSH. You will want to delete your existing ~/.ssh/id_rsa and ~/.ssh/id_rsa.pub files and run ./gravity-sync.sh configure again to generate a new key and copy it to the primary Pi-hole.

The ./gravity-sync.sh update and version functions will look for the dbclient binary on the local system and warn users about the upcoming changes.

2.1.1

  • Last release was incorrectly published without logic to ignore custom.list if request or not used.

2.1.2

  • Corrects a bug in backup automation that causes the backup to run every minute during the hour selected.

2.1.5

Skipping a few digits because what does it really matter?

  • Implements a new beta branch, and with it a new ./gravity-sync.sh beta function to enable it. This will hopefully allow new features and such to be added for test users who can adopt them and provide feedback before rolling out to the main update branch.
  • Uses new SQLITE3 backup methodology introduced in 2.1, for all push/pull sync operations.
  • ./gravity-sync.sh restore lets you select a different gravity.db and custom.list for restoration.
  • One new Star Trek reference.
  • ./gravity-sync.sh restore now shows recent complete Backup executions.

2.1.6

  • Adds prompts during ./gravity-sync.sh configure to allow custom SSH port and enable PING avoidance.
  • Adds ROOT_CHECK_AVOID variable to advanced configuration options, to help facilitate running Gravity Sync with container installations of Pi-hole. (PR #64)
  • Adds the ability to automate automation. :mind_blown_emoji: Please see the ADVANCED.md document for more information. (PR #64)

(Thanks to @fbourqui for this contributions to this release.)

2.1.7

  • Adjusts placement of configuration import to fully implement ROOT_CHECK_AVOID variable.
  • Someday I'll understand all these git error messages.

2.0

The Smart Release

In this release, Gravity Sync will now detect not only if each component (gravity.db and custom.list) has changed since the last sync, but also what direction they need to go. It will then initiate a push and/or pull specific to each piece.

Example: If the gravity.db has been modified on the primary Pi-hole, but the custom.list file has been changed on the secondary, Gravity Sync will now do a pull of the gravity.db then push custom.list and finally restart the correct components on each server. It will also now only perform a sync of each component if there are changes within each type to replicate. So if you only make a small change to your Local DNS settings, it doesn't kickoff the larger gravity.db replication.

The default command for Gravity Sync is now just ./gravity-sync.sh -- but you can also run ./gravity-sync.sh smart if you feel like it, and it'll do the same thing.

This allows you to be more flexible in where you make your configuration changes to block/allow lists and local DNS settings being made on either the primary or secondary, but it's best practice to continue making changes on one side where possible. In the event there are configuration changes to the same element (example, custom.list changes at both sides) then Gravity Sync will attempt to determine based on timestamps on what side the last changed happened, in which case the latest changes will be considered authoritative and overwrite the other side. Gravity Sync does not merge the contents of the files when changes happen, it simply overwrites the entire content.

New installs will use the smart function by default. Existing users who want to use this new method as their standard should run ./gravity-sync.sh automate function to replace the existing automated pull with the new Smart Sync. This is not required. The previous ./gravity-sync.sh pull and ./gravity-sync.sh push commands continue to function as they did previously, with no intention to break this functionality.

2.0.1

  • Fixes bug that caused existing crontab entry not to be removed when switching from pull to Smart Sync. #50

2.0.2

  • Correct output of smart function when script is run without proper function requested.
  • Decided marketing team was correct about display of versions in CHANGELOG.md -- sorry Chris.
  • Adds reference architectures to the ADVANCED.md file.
  • Checks for RSYNC functionality to remote host during ./gravity-sync.sh configure and prompts to install. #53
  • Move much of the previous README.md to ADVANCED.md file.

1.8

The Logical Release

There is nothing really sexy here, but a lot of changes under the covers to improve reliability between different SSH client types. A lot of the logic and functions are more consistent and cleaner. In some cultures, fewer bugs and more reliability are considered features. Much of this will continue through the 1.8.x line.

  • SSH/RSYNC connection logic rewritten to be specific to client options between OpenSSH, OpenSSH w/ SSHPASS, and Dropbear.
  • Key-pair generation functions rewritten to be specific to client options, also now works with no (or at least fewer) user prompts.
  • SSHPASS options should be more reliable if used, but removes messages that SSHPASS is not installed during setup, if it's not needed and Redirects user to documentation.
  • Adds custom port specification to ssh-copy-id and dropbearkey commands during configuration generation.
  • Generally better error handling of configuration options.

1.8.1

  • Detects if script is running as the root user or via sudo ./gravity-sync.sh and exits on error. #34

1.8.2

  • Corrects issue where custom.list file would not replicate if the file didn't exist locally, and there were no other changes to replicate. #39

1.8.3

  • Simplified method for input of automation frequency when running ./gravity-sync.sh automate function.
  • Now removes existing automation task from crontab, if it exists, when re-running automate function.
  • Automation can be disabled by setting frequency to 0 when prompted.
  • Adds dev tag to ./gravity-sync.sh version output for users running off the development branch.

1.7

The Andrew Release

Features

  • Gravity Sync will now manage the custom.list file that contains the "Local DNS Records" function within the Pi-hole interface.
  • If you do not want this feature enabled it can be bypassed by adding a SKIP_CUSTOM='1' to your .conf file.
  • Sync will be trigged during a pull operation if there are changes to either file.

Known Issues

  • No new Star Trek references.

1.7.1

  • There is a changelog file now. I'm mentioning it in the changelog file. So meta.
  • ./gravity-sync.sh version will check for and alert you for new versions.

1.7.2

This update changes the way that beta/development updates are applied. To continue receiving the development branch, create an empty file in the gravity-sync folder called dev and afterwards the standard ./gravity-sync.sh update function will apply the correct updates.

cd gravity-sync
touch dev
./gravity-sync.sh update

Delete the dev file and update again to revert back to the stable/master branch.

1.7.3

  • Cleaning up output of argument listing
  • Removes beta function for applying development branch updates.

1.7.4

  • ./gravity-sync.sh dev will now toggle dev flag on/off. No touch required, although it still works that way under the covers. Improvement of methods added in 1.7.2.
  • ./gravity-sync.sh update performs better error handling.
  • Slightly less verbose in some places to make up for being more verbose in others.
  • [DONE] has become [ OK ] in output.
  • [INFO] header is now yellow all the way across.
  • Tightens up verbiage of status messages.
  • Fixes custom.list not being processed by ./gravity-sync.sh restore function.
  • Detects absence of ssh client command on host OS (DietPi)
  • Detects absence of rsync client command on host OS (DietPi)
  • Detects absence of ssh-keygen utility on host OS and will use dropbearkey as an alternative (DietPi)
  • Changelog polarity reversed after heated discussions with marketing team.

1.7.5

  • No code changes!
  • Primary README now only reflect "The Easy Way" to install and configure Gravity Sync
  • "The Less Easy Way" are now part of ADVANCED.md
  • All advanced configuration options are outlined in ADVANCED.md

1.7.6

  • Detects dbclient install as alternative to OpenSSH Client.
  • Attempts to install OpenSSH Client if not found, and Dropbear is not alternative.
  • Fix bug with dropbearkey not finding .ssh folder.
  • Numerous fixes to accommodate DietPi in general.
  • Fixes issue where compare function would show changes where actually none existed.
  • [WARN] header is now purple all the way across, consistent with [INFO] as of 1.7.4.
  • Fixes issue where custom.list would only pull if the file already existed on the secondary Pi-hole.
  • One new Star Trek reference.

1.7.7

  • config function will attempt to ping remote host to validate network connection, can by bypassed by adding PING_AVOID='1' to your gravity-sync.conf file.
  • Changes some [INFO] messages to [WARN] where appropriate.
  • Adds aliases for more Gravity Sync functions.
  • Shows current version on each script execution.
  • Adds time output to Aborting message (exit without change.)
  • Includes parsing of functions in time calculation.
  • Checks for existence of Pi-hole binaries during validation.
  • Less chatty about each step of configuration validation if it completes.
  • Less chatty about replication validation if it's not necessary.
  • Less chatty about file validation if no changes are required.
  • When applying update in DEV mode, the Git branch used will be shown.
  • Validates log export operation.

1.6

The Restorative Release

  • New ./gravity-sync.sh restore function will bring a previous version of the gravity.db back from the dead.
  • Changes the way that Gravity Sync prompts for data input and how confirmation prompts are handled.
  • Adds ability to override verification of 'push', 'restore' or 'config' reset, see .example file for details.
  • Five new Star Trek references.
  • New functions add consistency in status output.

1.5

The Automated Release

  • You can now easily deploy the task automation via crontab by running ./gravity-sync.sh automate which will simply ask how often you'd like to run the script per hour, and then create the entry for you.
  • If you've already configured an entry for this manually with a prior version, the script should detect this and ask that you manually remove it or edit it via crontab -e. I'm hesitant to delete existing entries here, as it could potentially remove something unrelated to Gravity Sync.
  • Changes the method for pulling development branch updates via the 'beta' function.
  • Cleanup of various exit commands.

1.4

The Configuration Release

  • Adds new ./gravity-sync config feature to simplify deployment!
  • Adds variables for SSH settings.
  • Rearranges functions, which impacts nothing.
  • All new and exciting code comments.
  • No new Star Trek references.

1.4.1

  • Adds variables for custom log locations to gravity-sync.conf, see .example file for listing.

1.4.2

  • Will prompt to create new gravity-sync.conf file when run without an existing configuration.

1.4.3

  • Bug fixes around not properly utilizing custom SSH key-file.

1.3

The Comparison Release

1.3 should be called 2.0, but I'll resist that temptation -- but there are so many new enhancements!

  • Gravity Sync will now compare remote and local databases and only replicate if it detects a difference.
  • Verifies most commands complete before continuing each step to fail more gracefully.
  • Additional debugging options such as checking last cronjob output via ./gravity-sync.sh cron if configured.
  • Much more consistency in how running commands are processed in interactive mode.

1.3.1

  • Changes [GOOD] to [DONE] in execution output.
  • Better validation of initial SSH connection.
  • Support for password based authentication using SSHPASS.

1.3.2

  • MUCH cleaner output, same great features.

1.3.3

  • Corrected Pi-hole bin path issue that cause automated sync not to reload services.

1.3.4

  • Moves backup of local database before initiating remote pull.
  • Validates file ownership and permissions before attempting to rewrite.
  • Added two Star Trek references.

1.2

The Functional Release

  • Refactored process to use functions and cleanup process of execution.
  • Does not look for permission to update when run.
  • Cleanup and expand comments.

1.2.1

  • Improved logging functions.

1.2.2

  • Different style for status updates.

1.2.3

  • Uses a dedicated backup folder for .backup and .last files.
  • Copies db instead of moving to rename and then replacing to be more reliable.
  • Even cleaner label status.

1.2.4

  • Changes ~ to $HOME.
  • Fixes bug that prevented sync from working when run via crontab.

1.2.5

  • Push function now does a backup, on the secondary PH, of the primary database, before pushing.

1.1

The Pushy Release

  • Separated main purpose of script into pull argument.
  • Allow process to reverse back using push argument.

1.1.2

  • First release since move from being just a Gist.
  • Just relearning how to use GitHub, minor bug fixes.

1.1.3

  • Now includes example an configuration file.

1.1.4

  • Added update script.
  • Added version check.

1.1.5

  • Added ability to view logs with ./gravity-sync.sh logs.

1.1.6

  • Code easier to read with proper tabs.

1.0

The Initial Release

No version control, variables or anything fancy. It only worked if everything was exactly perfect.

echo 'Copying gravity.db from HA primary'
rsync -e 'ssh -p 22' ubuntu@192.168.7.5:/etc/pihole/gravity.db /home/pi/gravity-sync
echo 'Replacing gravity.db on HA secondary'
sudo cp /home/pi/gravity-sync/gravity.db /etc/pihole/
echo 'Reloading configuration of HA secondary FTLDNS from new gravity.db'
pihole restartdns reload-lists

For real, that's it. 6 lines, and could probably have be done with less.