This fixes all instances of " \t" in the code base. Most common case
seems to be after a "where" line; probably vim copied the two space layout
of that line.
Done as a background task while listening to episode 2 of the Type Theory
podcast.
The Upgrader avoids checking for upgrades on startup when it was just
upgraded. This avoids an upgrade loop if something goes wrong. One example
of something going wrong would be if the upgrade info file and the
distribution file get out of sync (or the distribution file is cached in
a proxy), so it thinks it has upgraded to a new version, but has really
not.
Not yet wired up to restart the assistant on upgrade; that needs careful
sanity checking to wait until the upgrade is done before restarting.
Used the DirWatcher here, so it gets events for any changes to the
directory containing the program file. (But not subdirs.) This is necessary
in order to detect when the file is renamed as part of the upgrade, which
an inotify on a single file would not detect. (Also, I have DirWatcher code,
but not FileWatcher code.)
Note that upgrades that remove or rename a whole directory tree containing
the executable will *not* trigger this code. So eg, deleting and replacing
the whole standalone tarball dir tree won't work -- but untarring it
over top will. So should dpkg package upgrades.
Added programPath, using a new GHC feature to find the full path to the
executable. The fallback code for old GHC or unsupported OS is less good;
its worst failure mode would be either failing to find the program, and so
not checking for upgrades, or finding a git-annex that's in PATH, but is
not the one running.
This commit was sponsored by John Roepke.
The webapp will check twice a day, when the network is connected, to see if
it can download a distributon upgrade file. If a newer version is found,
display an upgrade alert.
This will need the autobuilders to set UPGRADE_LOCATION to the url
it can be downloaded from when building git-annex. Only builds with that
set need automatic upgrade alerts.
Currently, the upgrade page just requests the user manually download
and upgrade it. But, all the info is provided to do automated upgrades
in the future.
Note that urls used will need to all be https.
This commit was sponsored by Dirk Kraft.
