[tz] macOS implements Links with file copies?

[Guy Harris]

On Feb 12, 2021, at 1:01 PM, Emily Crandall Fleischman <emilycf at mit.edu> wrote:

> It looks like Catalina (10.15.7) uses hard links:
> 
> $ ls -li /usr/share/zoneinfo.default/US/Pacific /usr/share/zoneinfo.default/America/Los_Angeles
> 1152921500311900283 -rw-r--r--  3 root  wheel  2819 Nov  9  2019 /usr/share/zoneinfo.default/America/Los_Angeles
> 1152921500311900283 -rw-r--r--  3 root  wheel  2819 Nov  9  2019 /usr/share/zoneinfo.default/US/Pacific

Depends on where you look:

$ ls -li /usr/share/zoneinfo.default/US/Pacific /usr/share/zoneinfo.default/America/Los_Angeles
1152921500311900257 -rw-r--r--  3 root  wheel  2819 Oct  9  2019 /usr/share/zoneinfo.default/America/Los_Angeles
1152921500311900257 -rw-r--r--  3 root  wheel  2819 Oct  9  2019 /usr/share/zoneinfo.default/US/Pacific
$ ls -li /usr/share/zoneinfo/America/Los_Angeles /usr/share/zoneinfo/US/Pacific
56302834 -rw-r--r--  1 root  wheel  2819 Oct 21 20:45 /usr/share/zoneinfo/America/Los_Angeles
56302650 -rw-r--r--  1 root  wheel  2819 Oct 21 20:45 /usr/share/zoneinfo/US/Pacific

Deborah?  Any idea what's going on here?  For what it's worth, /usr/share/zoneinfo.default and /usr/share/zoneinfo are on different file systems:

$ df /usr/share/zoneinfo.default
Filesystem    512-blocks     Used   Available Capacity iused       ifree %iused  Mounted on
/dev/disk1s1 15633066472 21990936 11080851032     1%  488348 78164844012    0%   /
$ df /usr/share/zoneinfo
Filesystem    512-blocks       Used   Available Capacity  iused       ifree %iused  Mounted on
/dev/disk1s2 15633066472 4497237704 11080851032    29% 11077044 78154255316    0%   /System/Volumes/Data