I'm setting up a private Arch Linux Arm repo for managing a large number of Raspberry Pi units to better control upgrades and software distribution (kinda like building an internal LTS version).
The internal mirror would use a /current symlink to point to a given set of packages, while updates would sync to a new directory based on day (/20180801), then repoint /current to the new set of packages once regression testing has been completed.
In an Arch Linux Arm mirror (eg, http://mi.us.mirror.archlinuxarm.org/armv7h/), there is a file called "sync" that currently contains some numbers. What is this file?
$ curl http://mi.us.mirror.archlinuxarm.org/armv7h/sync
1533143152
Can I use this file to test for repo updates and initiate a sync process? That is, does the contents of this file change only when the repo packages are updated?