Package Proxy Cache

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If you want to install the same Arch packages over and over - like for testing AIF profiles - it could help if you wouldn't have to get the packages every time from the internet. This article shows you how to setup a Squid proxy that only caches arch packages and can be used with aif/pacman/wget/etc with minimal configuration on the client system.

Install Squid

# pacman -S squid

Configure Squid

This is the minimum configuration to get squid cache arch packages.

Cache Rules

Before defining these rules, remove/comment (if you do not need them) all the default refresh_patterns

/etc/squid/squid.conf 
refresh_pattern \.pkg\.tar\.   0       20%     4320      reload-into-ims
refresh_pattern .              0       0%      0

That should define that *.pkg.tar.* gets cached, and anything else should not.

Maximum Filesize

Objects larger than this size will NOT be saved on disk:

/etc/squid/squid.conf 
maximum_object_size 256 MB

Cache Directory

Set the cache dir and its maximum size and subdirs:

/etc/squid/squid.conf 
cache_dir aufs /var/cache/squid 10000 16 256

Shutdown Lifetime

Time to wait until all active client sockets are closed:

/etc/squid/squid.conf 
shutdown_lifetime 1 seconds 
Note:

Every time you change the cache_dir path (and after fresh install), you need to (re)create this directory:

# squid -z

and it could be helpful to check the config file before running squid:

# squid -k check

Start Squid

# systemctl start squid.service

or if squid is already running:

# systemctl restart squid.service
Note:

It could be helpful to check the config file before running:

# squid -k check

Follow Squid access log

To see the access to squid:

# tail -f /var/log/squid/access.log

You should see this for packages that are directed to original host:

...TCP_MISS/200...DIRECT...

and for packages that are delivered from the cache:

...TCP_HIT/200...NONE...

Manual Arch Install

Before running /arch/setup, add variables for your proxy. To do so, run on the console:

# export http_proxy='http://your_squid_machine_ip:3128'
# export ftp_proxy='ftp://your_squid_machine_ip:3128'

Now just use /arch/setup to normally install the system, and it should use your proxy. Watch the squid logs to verify this.

Note: If you want to use the proxy settings in the installed system, you need to add the http_proxy and/or ftp_proxy variables in an appropriate place on the installed system. (like /etc/profile.d/proxy.sh)