[FEATURE]: Add continue from last time

[Mtepihasti5]

Is your feature request related to a problem? Please describe.

I was downloading retropie 4.8 for rpi 3 and others.
I did see that it can't resolve github.com
And i had to start from the beginning.
Then i said:
Aw BS.
So anyone please help me.

Describe the solution you would like to see implemented

It should continue from when it was cancelled.
On the start it should ask me should it continue from when it was cancelled

Describe alternatives you've considered

I'd consider that it tries until it can continue

Additional context

Please help me

Version

1.9.0

[lurch]

Unfortunately looking at https://github.com/raspberrypi/rpi-imager/blob/qml/src/imagewriter.cpp#L168 and https://github.com/raspberrypi/rpi-imager/blob/qml/src/imagewriter.cpp#L421 it doesn't actually store the URL of the file you were trying to download, but only the SHA256 checksum of the file that you last downloaded.

So on a SUCCESSFUL download & write attempt, the lastdownload.cache file will be updated with your (complete) image file, and the lastDownloadSHA256 setting will be updated with the checksum of your (complete) file. So the next time you try to download & write the same image, RPi Imager asks itself "Does the lastDownloadSHA256 match the checksum of the image I'm being asked to download? Oh, it does so I'll just write lastdownload.cache to the SD card instead."

But on an UNSUCCESSFUL download & write attempt (e.g. if your internet connection gets interrupted) the lastDownloadSHA256 setting will be updated with the checksum of your incomplete file. So the next time you try to download & write the same image, RPi Imager asks itself "Does the lastDownloadSHA256 match the checksum of the image I'm being asked to download? No it doesn't, so I'll ignore the lastdownload.cache file and download the image instead."

TLDR: This won't be an "easy fix".

[Mtepihasti5]

it's all right that it isn't an easy fix but please help me