Important note 2018-06-06
For the last couple of years, @carlashley and @krypted have maintained this together. Unfortunately @carlashley is stepping away for personal reasons. The fork on his git repo will be closed on 2018-06-30 permanently.
What does it do?
Assets such as iOS/tvOS/watchOS/Mac App Store apps/OS X Installers/Combo Updates are cached through the detected or provided Caching Server. If an asset is not currently in cache, it is downloaded; if the asset is in the cache, then the asset is skipped. A progress indicator provides feedback on how much of the download is left.
Requires Python 2.7.10 or newer.
Current macOS Installers (public releases)
- El Capitan 10.11.6
- Sierra 10.12.2
Note macOS Installers from the Mac App Store are not scraped from an XML feed, instead they have to be updated each time a new release or dot release comes out.
Combo software updates for:
- Mac OS X El Capitan
- macOS Sierra (when/as released)
Current Mac App Store apps (public releases)
- macOS Server
- Final Cut Pro
git clone https://github.com/krypted/precache
- Make sure
chmod +x precache.py
- Set ownership:
sudo chown root:wheel /usr/local/bin/precache.py
precache.py --helpfor usage
usage: precache.py [-h] [--cache-group <product name> [<product name> ...]] [--cache-ipsw-group <product name> [<product name> ...]] [-cs http://cacheserver:port] [--debug] [-n] [--filter-group <product name> [<product name> ...]] [-i model [model ...]] [-l] [-m model [model ...]] [-o file path] optional arguments: -h, --help show this help message and exit --cache-group <product name> [<product name> ...] Cache assets based on group --cache-ipsw-group <product name> [<product name> ...] Cache IPSW based on group -cs, --cache-server http://cacheserver:port Specify the cache server to use. --debug Debug mode - increased log verbosity. -n, --dry-run Shows what would be cached. --filter-group <product name> [<product name> ...] Filter based on group -i, --ipsw model [model ...] Cache IPSW for provided model/s. -l, --list Lists all assets available for caching. -m, --model model [model ...] Provide model(s)/app(s), i.e iPhone8,2 Xcode. -o, --output file path Path to save IPSW files to. --jamfserver Indicates a Jamf Pro server or cloud instance URL to pull a list of unique models from. e.g. --jamfserver=myjss --jamfuser Provide a username to access your server or cloud instance. e.g. --jamfuser=admin --jamfpassword Provide the password for the user of the Jamf Pro server or cloud instance. e.g. --jamfpassword=mypassword
[user@valkyrie]: # precache.py --cache-group installer --cache-ipsw-group iPod -i iPhone8,2 -o ~/Desktop/ipsw/ Caching Server: http://192.168.1.16:49672 Processing feeds. This may take a few moments. Skipped: ElCapitan (10.11.6) - in cache Skipped: Sierra (10.12.1) - in cache Caching: iPod5,1 (9.3.5) [100.00% of 1.50GB] Caching: iPod7,1 (10.1) [100.00% of 2.03GB] Skipped: iPhone8,2 (10.1) - in cache
How it works
- The script will first attempt to use
AssetCacheLocatorUtil(macOS 10.12 or newer) to force the local machine to find the Caching Server for its network
- The script then checks to see if the machine is a Caching Server, and if it is, uses the relevant URL and port
- If the machine isn't a Caching Server, then it checks to see if the machine knows where the Caching Server for its network is located, and if it finds this, uses the relevant URL and port
- If this fails, it falls back to
- When initalised, a test confirms that the caching server can be accessed. If not, the script exits.
- Alternatively, specify which Caching Server to use by using the flag
-cs http://cachingserver:port- where
cachingserver:portare the appropriate values
- You can find your caching servers port by running:
sudo serveradmin fullstatus caching
- Files are downloaded through the Caching Server; if the asset is already in the cache, it is skipped. Only IPSW files are kept
- IPSW files are saved in
/tmp/precacheby default. Use the
--outputflag with a file path to save to a specific location
- Logs are written out to
In some environments, it may be desirable to run this as a LaunchDaemon on a Caching server in order to keep particular assets available. To do this, you could use a basic LaunchDaemon that runs once a day.
The example below has the
precache.py tool located in
/usr/local/bin and is set to get the OTA updates for an iPhone8,2 and iPad6,7; it runs on a Wednesday at 19:00.
A copy of this plist is included in this repo, simply place it in
Using the LaunchDaemon
- Copy the LaunchDaemon to
- Change the ownership:
chown root:wheel /Library/LaunchDaemons/com.github.krypted.precache.plist
- Change the permissions:
chmod 644 /Library/LaunchDaemons/com.github.krypted.precache.plist
- Modify the LaunchDaemon file to suit your needs
- If you're not putting the
/usr/local/binmake sure you adjust the path in the line
- Make sure the
precache.pyscript is in the correct location and with the correct permissions
- Load the LaunchDaemon:
sudo launchctl load -w /Library/LaunchDaemons/com.github.krypted.precache.plist
If you want to change the day/s when this runs, you can simply change the integer values for
Weekday to any combination of days, such as
246. This will run on Tuesday, Thursday, and Saturday.
To change the time, simply change the integer values for
Minute - use 24hr time.
StartCalendarInterval reading: http://stackoverflow.com/questions/3570979/whats-the-difference-between-day-and-weekday-in-launchd-startcalendarinterv
You could alternatively use outset with a script that calls
precache.py with relevant flags.
Outset is available from https://github.com/chilcote/outset