Created
January 8, 2016 05:19
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| # the "current" link is what the app should use | |
| # "upcoming current" is where the updated files get written to | |
| # | |
| # start off with it pointing to tempdir1 | |
| reigate:xx kevin$ lsl | |
| total 16 | |
| drwxr-xr-x 2 kevin staff 68 Jan 7 21:07 tempdir2/ | |
| drwxr-xr-x 2 kevin staff 68 Jan 7 21:11 tempdir1/ | |
| lrwxr-xr-x 1 kevin staff 8 Jan 7 21:12 current@ -> tempdir1 | |
| lrwxr-xr-x 1 kevin staff 8 Jan 7 21:12 upcoming_current@ -> tempdir2 | |
| # use rename for an atomic rename, see "man 2 rename": | |
| # If newpath already exists it will be atomically replaced (subject to a few conditions; see ERRORS | |
| # below), so that there is no point at which another process attempting to access newpath will find it | |
| # missing. | |
| # (perl is just an easy way for me to access it) | |
| reigate:xx kevin$ perl -le 'rename "upcoming_current", "current" or die $!' | |
| reigate:xx kevin$ lsl | |
| total 8 | |
| drwxr-xr-x 2 kevin staff 68 Jan 7 21:07 tempdir2/ | |
| drwxr-xr-x 2 kevin staff 68 Jan 7 21:11 tempdir1/ | |
| lrwxr-xr-x 1 kevin staff 8 Jan 7 21:12 current@ -> tempdir2 | |
| # now the app accessing "current" gets the new stuff |
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