The getSocket comment that mentioned using ":port"
in the hostname seems to have been incorrect or be out of date.
After all, the bug report came when the user first tried doing that,
and it didn't work.

Sponsored-by: the NIH-funded NICEMAN (ReproNim TR&D3) project

The segfault seems to be fixed with git 2.43, I'm not sure what the
affected range was.

Sponsored-by: Dartmouth College's DANDI project

external: Monitor file size when getting content from external special
remotes and use that to update the progress meter, in case the external
special remote program does not report progress.

This relies on 703a70ca to prevent ever
running the meter backwards.

Sponsored-by: Dartmouth College's DANDI project

Sponsored-by: Dartmouth College's DANDI project

This is groundwork for using watchFileSize for downloads from external
special remotes.

In Annex.Content.downloadUrl, this potentially avoids jitter in the
progress meter. When downloading with conduit, the meter gets updated based
on both the size of the file, and on the data flowing through conduit.
If that has not yet been flushed to the file, it seems possible for the
meter to run backwards when meter is updated with the file size.
It's probably only a few kb of jitter, so may not be visible.

Sponsored-by: Dartmouth College's DANDI project

Refactored to allow offline experimentation, and ended up changing the
allowedvariation (aka fudge factor) to 3. 10 seems too high, and 1.5 too low.

Scale earlier, so even if the first chunk takes less than the configured
time period, allowance is made that later chunks might transfer slower.
Decided to use the same allowedvariation to decide when to start
scaling.

Smoothed the scaling out.

Some examples:

ghci> upscale (BwRate 10 (Duration 60)) 25
BwRate 13 (Duration {durationSeconds = 75})
-- A small scaling upwards after 1/3rd the time. Not noticable.
ghci> upscale (BwRate 10 (Duration 60)) 60
BwRate 30 (Duration {durationSeconds = 180})
-- At the configured time, 3x scaling.
ghci> upscale (BwRate 10 (Duration 60)) 120
BwRate 60 (Duration {durationSeconds = 360})
-- A typical upscaling, here a 1 minute duration became 6 minutes
-- due to the first chunk taking 2 minutes to transfer.
ghci> upscale (BwRate 10 (Duration 60)) 600
BwRate 300 (Duration {durationSeconds = 1800})
-- Here the first chunk took 10 minutes to transfer, so it will
-- take 30 minutes to detect a stall.

Sponsored-by: Dartmouth College's DANDI project

Improve annex.stalldetection to handle remotes that update progress less
frequently than the configured time period.

In particular, this makes remotes that don't report progress but are
chunked work when transferring a single chunk takes longer than the
specified time period.

Any remotes that just have very low update granulatity would also be
handled by this.

The change to Remote.Helper.Chunked avoids an extra progress update when
resuming an interrupted upload. In that case, the code saw first Nothing
and then Just the already transferred number of bytes, which defeated this
new heuristic. This change will mean that, when resuming an interrupted
upload to a chunked remote that does not do its own progress reporting, the
progress display does not start out displaying the amount sent so far,
until after the first chunk is sent. This behavior change does not seem
like a major problem.

About the scalefudgefactor, it seems reasonable to expect subsequent chunks
to take no more than 1.5 times as long as the first chunk to transfer.
Could set it to 1, but then any chunk taking a little longer would be
treated as a stall. 2 also seems a likely value. Even 10 might be fine?

Sponsored-by: Dartmouth College's DANDI project

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Avoid users getting confused and thinking this allows specifying the
port.

Sponsored-by: the NIH-funded NICEMAN (ReproNim TR&D3) project