[Backport release-1.30] Disable grab download resume #5043
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This is to mitigate cases like #4296 By default grab tries to resume the download if the file name determined from either the url or from content-type headers already exists. This makes things go side ways, if the existing file is smaller than the new one, the old content would still be there and only the "extra" new bytes would get written. I.e. the download would be "resumed". 🤦 So this change disables resuming altogether fro grab. To be able to download and replace k0s without resuming, i.e. "truncate" the file in-between. We need to force the download to download it as k0s.tmp first. Only after that we can safely move the file as truncating a running binary is not allowed and will error with `text file busy`. This is a minimal possible fix that we can easily backport. @twz123 is already working on bigger refactoring of autopilot download functionality that gets rid of grab. Grab seems to bring more (bad) surprises than real benefits. In the end, we just download files and we should pretty much always just replace them. No need for full library dependecy for that. Signed-off-by: Jussi Nummelin <jnummelin@mirantis.com> (cherry picked from commit 4e610ab)
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Sep 26, 2024
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Automated backport to
release-1.30, triggered by a label in #5042.See #4296 #5020.