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Difference between revisions of "$FG HOME"

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m (Use “navdata cache” instead of “NavDB cache” for consistency (“Navdata cache” being the canonical name of the corresponding page on the wiki))
(Fix case of fgfsrc, otherwise it won't work on case-sensitive filesystems (which is the case of most filesystems on Linux and traditional Unices))
 
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{{note|The <code>/sim/fg-home</code> property should be considered read-only, for similar reasons why <code>$FG_HOME</code> shouldn't be explicitly set by users.}}
 
{{note|The <code>/sim/fg-home</code> property should be considered read-only, for similar reasons why <code>$FG_HOME</code> shouldn't be explicitly set by users.}}
{{note|FlightGear reads the <code>[[Fgfsrc]]</code> config file from <code>$FG_HOME</code> if it exists (<tt>fgfsrc</tt> without any leading dot), in addition to <tt>.fgfsrc</tt> from <code>$HOME</code> (with a leading dot in this case).}}
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{{note|FlightGear reads the <code>[[Fgfsrc|fgfsrc]]</code> config file from <code>$FG_HOME</code> if it exists (<tt>fgfsrc</tt> without any leading dot), in addition to <tt>.fgfsrc</tt> from <code>$HOME</code> (with a leading dot in this case).}}
  
 
== Content ==
 
== Content ==
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=== Windows ===
 
=== Windows ===
 
==== FlightGear 3.0 and later ====
 
==== FlightGear 3.0 and later ====
<code>%HOME%\Documents\FlightGear</code>
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<code>%userprofile%\Documents\FlightGear</code>
  
<code>%HOME%</code> is usually <code>C:\Users\''User name''</code>
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<code>%userprofile%</code> is <code>%homedrive%\Users\''User name''</code> by default, and <Code>%homedrive%</code> is usually C:\.
  
 
==== Before FlightGear 3.0 ====
 
==== Before FlightGear 3.0 ====
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When you encounter problems, try deleting the files, but '''always''' keep the <code>fgfs.log</code> and <code>fgfs_0.log</code> log files to help in troubleshooting.
 
When you encounter problems, try deleting the files, but '''always''' keep the <code>fgfs.log</code> and <code>fgfs_0.log</code> log files to help in troubleshooting.
 +
 +
== Power Users ==
 +
Note you can also override FG_HOME in the environment, to have totally distinct installs - this would be my recommend approach to running multiple versions in parallel.
 +
(The installers will always replace the stable / dev version as other commenters pointed out, so you can't use those so easily, you need to copy files around - I'm nota Windows expert so I don't know if there something that could be changed or improved here)
 +
If you start multiple instances (the same version or different) of FGFS using the same value of FG_HOME (whether that be the default or a custom one), we use a lock file to ensure only one (the first) has write access. The rest will go into read-only mode, and as you can maybe guess, treat FG_HOME as read-only.
 +
Sharing of aircraft / scenery is entirely about which paths are configured, BTW. However, one final caveat is that having multiple instances both running TerraSync, using the same terrasync dir, would likely act a bit funny. It ought to actually work, but it might download some things twice, and it's not a tested or supported configuration for the moment.<ref>{{cite web
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  |url    =  https://forum.flightgear.org/viewtopic.php?p=304170#p304170
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  |title  =  <nowiki> Re: Is it possible to install multiple instanes of FG in Win </nowiki>
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  |author =  <nowiki> zakalawe </nowiki>
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  |date  =  Jan 25th, 2017
 +
  |added  =  Jan 25th, 2017
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  |script_version = 0.40
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  }}</ref>
 +
  
 
== Related content ==
 
== Related content ==

Latest revision as of 04:41, 27 April 2019

Screen shot showing typical structure $FG_HOME

$FG_HOME is an environment variable indicating the main location where user-specific FlightGear data is stored (not application data). $FG_HOME is a notable place were FlightGear data is written to, contrary to $FG_ROOT, which is generally read-only.

$FG_HOME is normally used to refer to the operating system specific location for some settings/folders. Its default value is determined by the fgfs binary during startup and is a directory that varies with the operating system supported by FG (Windows, OS X and Linux). It is highly recommended to rely on the default value (i.e., not setting $FG_HOME yourself in any way), unless you Really Know What You Are Doing™.

Note  The /sim/fg-home property should be considered read-only, for similar reasons why $FG_HOME shouldn't be explicitly set by users.
Note  FlightGear reads the fgfsrc config file from $FG_HOME if it exists (fgfsrc without any leading dot), in addition to .fgfsrc from $HOME (with a leading dot in this case).

Content

In $FG_HOME is information stored between sessions. That information is for example configuration/preferences, properties marked with the user-archive attribute and aircraft-specific settings (using the data helper class in aircraft.nas). $FG_HOME is also the location for the SQLite-based navdata cache.

Common paths

You can determine the location of your $FG_HOME by using the property browser and checking the value of /sim/fg-home, but the usual paths are shown below.

You can also use the Nasal Console to print out $FG_HOME:

var path = getprop("/sim/fg-home");
print("Your $FG_HOME is at: ", path);

The /sim/ property subtree is also the place where you can find other folders, such as fg-root, fg-scenery and the current working directory (fg-current).

Linux

~/.fgfs/

Mac OS X

~/Library/Application Support/FlightGear (to learn more about viewing hidden folders, see [1])

As all future FlightGear versions will take their preferences from here, it is a good idea to have their access available easily.

Desktop/Finder/Go/Go to Folder is where you need to start.

When given the option, input: ~/Library/Application Support/FlightGear

It is probably a good idea to have ~/Library/Application Support/FlightGear saved on a Stickies note just in case you forget it.

If you want/need to refer to any of these files frequently, you could make an alias of a file, or the whole folder, and place it somewhere easier to access. TerraSync data is stored in $FG_HOME/TerraSync in the default configuration, see TerraSync for details.

Windows

FlightGear 3.0 and later

%userprofile%\Documents\FlightGear

%userprofile% is %homedrive%\Users\User name by default, and %homedrive% is usually C:\.

Before FlightGear 3.0

%APPDATA%\flightgear.org\

%APPDATA% is another environment variable that depends on your Windows version. On XP and older, it can be found under C:\Documents and Settings\User name\Application Data. On Vista and later it can be found under C:\Users\User name\AppData\Roaming. The folder is hidden by default. See these instructions to show the folder.

Use in troubleshooting

As one user once said, "When in doubt delete $FG_HOME". Many problems, including corrupted databases, broken TerraSync and many others can be fixed by deleting fgfs_0.txt, fgfs.txt, terrasync_cache, and the navdata cache.

When you encounter problems, try deleting the files, but always keep the fgfs.log and fgfs_0.log log files to help in troubleshooting.

Power Users

Note you can also override FG_HOME in the environment, to have totally distinct installs - this would be my recommend approach to running multiple versions in parallel. (The installers will always replace the stable / dev version as other commenters pointed out, so you can't use those so easily, you need to copy files around - I'm nota Windows expert so I don't know if there something that could be changed or improved here) If you start multiple instances (the same version or different) of FGFS using the same value of FG_HOME (whether that be the default or a custom one), we use a lock file to ensure only one (the first) has write access. The rest will go into read-only mode, and as you can maybe guess, treat FG_HOME as read-only. Sharing of aircraft / scenery is entirely about which paths are configured, BTW. However, one final caveat is that having multiple instances both running TerraSync, using the same terrasync dir, would likely act a bit funny. It ought to actually work, but it might download some things twice, and it's not a tested or supported configuration for the moment.[1]


Related content

Wiki articles

  • zakalawe  (Jan 25th, 2017).  Re: Is it possible to install multiple instanes of FG in Win .