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# Profile-sync-daemon

From ArchWiki

Summary
Profile-sync-daemon (psd) is a diminutive pseudo-daemon designed to manage your browser's profile in tmpfs and to periodically sync it back to your physical disc (HDD/SSD). This is accomplished via a symlinking step and an innovative use of rsync to maintain back-up and synchronization between the two. One of the major design goals of psd is a completely transparent user experience.
Related
Anything-sync-daemon
Firefox
Chromium
Opera
SSD

## Benefits of Psd

Running this daemon is beneficial for two reasons:

1. Reduced wear to physical discs
2. Speed

Since the profile(s), browser cache*, etc. are relocated into tmpfs (RAM disk), the corresponding onslaught of I/O associated with using the browser is also redirected from the physical disc to RAM, thus reducing wear to the physical disc and also greatly improving browser speed and responsiveness. For example, the access time of RAM is on the order of nanoseconds while the access time of physical discs is on the order of milliseconds. This is a difference of six orders of magnitude or 1,000,000 times faster.

Note: Chromium actually keeps its cache directory separately from its browser profile directory. It is not within the scope of profile-sync-daemon to modify this behavior; users are encouraged to refer to the Chromium_Tips_and_Tweaks#Cache_in_tmpfs section of the main Chromium_Tips_and_Tweaks article for several work-arounds.

## Supported Browsers

Currently, the following browsers are auto-detected and managed:

- chromium
- conkeror
- firefox (all flavors including stable, beta, and aurora)
- firefox-trunk: An Ubuntu-only browser
- google-chrome
- google-chrome-beta
- heftig's version of aurora: An Arch Linux only browser
- midori
- opera
- opera-next
- Qupzilla

## Setup and Installation

profile-sync-daemon is available for download from the AUR. Build it and install like any other package.

### Edit /etc/psd.conf

Edit the included `/etc/psd.conf` defining which user(s) will have their profiles managed by psd.

Example:

    # List users separated by spaces whose browser(s) profile(s) will get symlinked
    # and sync'ed to tmpfs.
    # Do NOT list a user twice!
    USERS="facade happy"

Note: At least one user must be defined.

Optionally uncomment the BROWSERS array and populate it with whichever browser(s) are to be sync'ed to tmpfs. If the BROWSERS array stays commented (default) then all supported browser profiles will be sync'ed if they exist.

Example: Let's say that Chromium, Opera and Midori are installed but only Chromium and Opera are to be sync'ed to tmpfs since the user keeps Midori as a backup browser and it is seldom used:

    # List browsers separated by spaces to include in the sync. Useful if you do not
    # wish to have all possible browser profiles sync'ed.
    #
    # Possible values:
    #   chromium
    #   conkeror.mozdev.org
    #   firefox
    #   firefox-trunk
    #   google-chrome
    #   heftig-aurora
    #   midori
    #   opera
    #   opera-next
    #   qupzilla
    #
    # If the following is commented out (default), then all available/supported
    # browsers will be sync'ed, separated by comma
    BROWSERS="chromium opera"

## Using PSD

### Preview Mode (Parse)

The 'parse' option can be called to show users exactly what psd will do based on the /etc/psd.conf entered. Call it like so:

    $ profile-sync-daemon parse
     Profile-sync-daemon v5.24

    Psd will manage the following per /etc/psd.conf settings:

    browser/psname:  chromium/chromium
    owner/group:     facade/users
    sync target:     /home/facade/.config/chromium
    tmpfs dir:       /tmp/facade-chromium
    profile size:    81M

    browser/psname:  firefox/firefox
    owner/group:     facade/users
    sync target:     /mnt/data/docs/facade/mozilla/firefox/1Zp9V43q.banking
    tmpfs dir:       /tmp/facade-firefox-1Zp9V43q.banking
    profile size:    5.9M

    browser/psname:  firefox/firefox
    owner/group:     facade/users
    sync target:     /mnt/data/docs/facade/mozilla/firefox/obg67zqQ.proxy
    tmpfs dir:       /tmp/facade-firefox-obg67zqQ.proxy
    profile size:    17M

As shown in the output and as stated above, if no specific browser or subset of browsers are defined in the BROWSERS array, psd will sync ALL supported profiles that it finds for the given user(s).

### Running PSD to Manage Profiles

Do not call `/usr/bin/profile-sync-daemon` to sync or to unsync directly. Instead use the provided service files.

Both a systemd service file and a timer are provided and should be used to interact with psd. Both should be invoked together! The role of the timer is update the tmpfs copy/copies back to the disk which it does once per hour. Failure to start the resync timer will result in the profile being sync'ed only on start up and shutdown.

    # systemctl [option] psd.service psd-resync.service

Available options:

    start  Turn on daemon and timer.
    stop  Turn off daemon and timer.
    enable  Autostart daemon and timer on boot-up.
    disable  Don't autostart daemon and timer on boot-up.

Start psd and its timer as well as set psd and its timer to start/stop at boot/shutdown (highly recommended):

    # systemctl enable psd.service psd-resync.service
    # systemctl start psd.service psd-resync.service

Obviously, you must first close your browser before starting the service.

### Sync at More Frequent Intervals (Optional)

The package provided timer syncs once per hour. Users may optionally redefine this behavior simply by extending the systemd unit. The example below changes the timer to sync once every ten minutes:

    /etc/systemd/system/psd-resync.timer.d/frequency.conf

    [Unit]
    Description=Timer for Profile-sync-daemon - 10min

    [Timer]
    # Empty value resets the list of timers
    OnUnitActiveSec=
    OnUnitActiveSec=10min

See `man systemd.timer` for additional options.

## Caveats for Firefox and Heftig's Aurora ONLY

The way psd keeps track of browser profiles and sync targets requires users to have a unique name as the last directory for all profiles in their respective $HOME/.mozilla/<browser>/profiles.ini files. Psd will check when it is called to run for this and refuse if this rule is not satisfied. The following is an example of a BAD profile that will fail the the test. Note that although each full path is unique, they both end in the same name! Again, the user must modify the profiles.ini and the corresponding directory on the filesystem to correct this in order to use Psd.

    $ cat ~/.mozilla/firefox/profiles.ini

    [General]
    StartWithLastProfile=1

    [Profile0 for user facade]
    Name=normal
    IsRelative=0
    Path=/mnt/data/docs/facade/mozilla/firefox/myprofile.abc
    Default=1

    [Profile1 for user happy]
    Name=proxy
    IsRelative=0
    Path=/mnt/data/docs/happy/mozilla/firefox/myprofile.abc

## FAQ

Note: The first three questions apply to versions of psd equal to or greater than v5.40 only.

### Q1. My system crashed and didn't sync back. What do I do?

Odds are the "last good" backup of your browser profiles is just fine still sitting happily on your filesystem. Upon restarting psd (on a reboot for example), a check is preformed to see if the symlink to the tmpfs copy of your profile is invalid. If it is invalid, psd will snapshot the "last good" backup before it rotates it back into place. This is more for a sanity check that psd did no harm and that any data loss was a function of something else.

### Q2. Where can I find this snapshot?

It depends on the browser. You will find the snapshot in the same directory as the browser profile and it will contain a date-time-stamp that corresponds to the time at which the recovery took place. For example, chromium will be `~/.config/chromium-backup-crashrecovery-20130912_153310` -- of course, the date_time suffix will be different for you.

### Q3. How can I restore the snapshot?

- Stop psd.
- Confirm that there is no symlink to the tmpfs browser profile directory. If there is, psd did not stop correctly for other reasons.
- Move the "bad" copy of the profile to a backup (don't blindly delete anything).
- Copy the snapshot directory to the name that browser expects.

Example using chromium:

    mv ~/.config/chromium ~/.config/chromium-bad
    cp -a ~/.config/chromium-backup-crashrecovery-20130912_153310 ~/.config/chromium

At this point you can launch chromium which will use the backup snapshot you just copied into place. If all is well, close the browser and restart psd and psd-resync (if using systemd). You may safely delete `~/.config/chromium-backup-crashrecovery-20130912_153310` at this point.

## Support

Post in the discussion thread with comments or concerns.

## PSD On Other Distros

Psd is a bash script and should therefore run on any Linux distro. Below is a list of distros known to package psd, and a link to download their respective packages.

Note: Different distros use different init systems. The packages linked below are configured to use the default init system for the given distro.

Distro | Default Init System | Link to Package
--- | --- | ---
Arch | Systemd | AUR.
Chakra | Systemd | CCR.
Debian | Upstart | Graysky's PPA. See instruction below.
Exherbo | Systemd | In official repos.
Fedora | Systemd | In official repos.
Gentoo | OpenRC | In official repos.
Mint | Upstart | Graysky's PPA. See instruction below.
OpenSUSE | Upstart | Packaged by Overman79.
Ubuntu | Upstart | Graysky's PPA, See instruction below.
Void | Systemd | In official repos.

### Debian

To add the PPA (personal package archive) to your Debian (tested on squeeze) system, and to install psd:

    # echo "deb http://ppa.launchpad.net/graysky/utils/ubuntu quantal main" > /etc/apt/sources.list.d/graysky.list
    # echo "deb-src http://ppa.launchpad.net/graysky/utils/ubuntu quantal main" >> /etc/apt/sources.list.d/graysky.list
    # apt-key adv --keyserver keyserver.ubuntu.com --recv-keys FF7F9516
    # apt-get update
    # apt-get install profile-sync-daemon

### Mint and Ubuntu

To add the PPA (personal package archive) to your Ubuntu (packages available for Lucid and newer) system, and to install psd:

    $ sudo add-apt-repository ppa:graysky/utils
    $ sudo apt-get update
    $ sudo apt-get install profile-sync-daemon

## External Links Mentioning PSD

- http://www.webupd8.org/2013/02/keep-your-browser-profiles-in-tmpfs-ram.html
- http://bernaerts.dyndns.org/linux/250-ubuntu-tweaks-ssd

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