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operations: implement uploads to temp name with --inplace to disable

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When copying to a backend which has the PartialUploads feature flag
set and can Move files the file is copied into a temporary name first.
Once the copy is complete, the file is renamed to the real
destination.

This prevents other processes from seeing partially downloaded copies
of files being downloaded and prevents overwriting the old file until
the new one is complete.

This also adds --inplace flag that can be used to disable the partial
file copy/rename feature.

See #3770

Co-authored-by: Nick Craig-Wood <nick@craig-wood.com>
This commit is contained in:
Janne Hellsten
2023-04-04 18:19:16 +03:00
committed by Nick Craig-Wood
parent cc01223535
commit 5c594fea90
5 changed files with 153 additions and 7 deletions
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1
fs/config/configflags/configflags.go
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@@ -145,6 +145,7 @@ func AddFlags(ci *fs.ConfigInfo, flagSet *pflag.FlagSet) {
flags.BoolVarP(flagSet, &ci.ServerSideAcrossConfigs, "server-side-across-configs", "", ci.ServerSideAcrossConfigs, "Allow server-side operations (e.g. copy) to work across different configs")
flags.FVarP(flagSet, &ci.TerminalColorMode, "color", "", "When to show colors (and other ANSI codes) AUTO|NEVER|ALWAYS")
flags.FVarP(flagSet, &ci.DefaultTime, "default-time", "", "Time to show if modtime is unknown for files and directories")
flags.BoolVarP(flagSet, &ci.Inplace, "inplace", "", ci.Inplace, "Download directly to destination file instead of atomic download to temp/rename")
}
// ParseHeaders converts the strings passed in via the header flags into HTTPOptions