TrueCloudLab/rclone
16
0
Fork 2
Code Issues Pull requests 1 Projects Releases Packages Wiki Activity Actions 1
rclone/cmd/bisync/testdata/test_resync_modes/scenario.txt

70 lines
2.5 KiB
Text
Raw Normal View History

bisync: add --resync-mode for customizing --resync - fixes #5681 Before this change, the path1 version of a file always prevailed during --resync, and many users requested options to automatically select the winner based on characteristics such as newer, older, larger, and smaller. This change adds support for such options. Note that ideally this feature would have been implemented by allowing the existing `--resync` flag to optionally accept string values such as `--resync newer`. However, this would have been a breaking change, as the existing flag is a `bool` and it does not seem to be possible to have a `string` flag that accepts both `--resync newer` and `--resync` (with no argument.) (`NoOptDefVal` does not work for this, as it would force an `=` like `--resync=newer`.) So instead, the best compromise to avoid a breaking change was to add a new `--resync-mode CHOICE` flag that implies `--resync`, while maintaining the existing behavior of `--resync` (which implies `--resync-mode path1`. i.e. both flags are now valid, and either can be used without the other. --resync-mode CHOICE In the event that a file differs on both sides during a `--resync`, `--resync-mode` controls which version will overwrite the other. The supported options are similar to `--conflict-resolve`. For all of the following options, the version that is kept is referred to as the "winner", and the version that is overwritten (deleted) is referred to as the "loser". The options are named after the "winner": - `path1` - (the default) - the version from Path1 is unconditionally considered the winner (regardless of `modtime` and `size`, if any). This can be useful if one side is more trusted or up-to-date than the other, at the time of the `--resync`. - `path2` - same as `path1`, except the path2 version is considered the winner. - `newer` - the newer file (by `modtime`) is considered the winner, regardless of which side it came from. This may result in having a mix of some winners from Path1, and some winners from Path2. (The implementation is analagous to running `rclone copy --update` in both directions.) - `older` - same as `newer`, except the older file is considered the winner, and the newer file is considered the loser. - `larger` - the larger file (by `size`) is considered the winner (regardless of `modtime`, if any). This can be a useful option for remotes without `modtime` support, or with the kinds of files (such as logs) that tend to grow but not shrink, over time. - `smaller` - the smaller file (by `size`) is considered the winner (regardless of `modtime`, if any). For all of the above options, note the following: - If either of the underlying remotes lacks support for the chosen method, it will be ignored and will fall back to the default of `path1`. (For example, if `--resync-mode newer` is set, but one of the paths uses a remote that doesn't support `modtime`.) - If a winner can't be determined because the chosen method's attribute is missing or equal, it will be ignored, and bisync will instead try to determine whether the files differ by looking at the other `--compare` methods in effect. (For example, if `--resync-mode newer` is set, but the Path1 and Path2 modtimes are identical, bisync will compare the sizes.) If bisync concludes that they differ, preference is given to whichever is the "source" at that moment. (In practice, this gives a slight advantage to Path2, as the 2to1 copy comes before the 1to2 copy.) If the files _do not_ differ, nothing is copied (as both sides are already correct). - These options apply only to files that exist on both sides (with the same name and relative path). Files that exist *only* on one side and not the other are *always* copied to the other, during `--resync` (this is one of the main differences between resync and non-resync runs.). - `--conflict-resolve`, `--conflict-loser`, and `--conflict-suffix` do not apply during `--resync`, and unlike these flags, nothing is renamed during `--resync`. When a file differs on both sides during `--resync`, one version always overwrites the other (much like in `rclone copy`.) (Consider using `--backup-dir` to retain a backup of the losing version.) - Unlike for `--conflict-resolve`, `--resync-mode none` is not a valid option (or rather, it will be interpreted as "no resync", unless `--resync` has also been specified, in which case it will be ignored.) - Winners and losers are decided at the individual file-level only (there is not currently an option to pick an entire winning directory atomically, although the `path1` and `path2` options typically produce a similar result.) - To maintain backward-compatibility, the `--resync` flag implies `--resync-mode path1` unless a different `--resync-mode` is explicitly specified. Similarly, all `--resync-mode` options (except `none`) imply `--resync`, so it is not necessary to use both the `--resync` and `--resync-mode` flags simultaneously -- either one is sufficient without the other.
2023-12-22 19:09:35 +00:00
test resync-mode
# Check conflict-resolution options during resync
# - Changed on Path2 and on Path1, and NOT identical file1 (file1r, file1l)
test changed on both paths and NOT identical - file1 (file1R, file1L)
touch-glob 2001-01-02 {datadir/} file1R.txt
copy-as {datadir/}file1R.txt {path2/} file1.txt
touch-glob 2001-03-04 {datadir/} file1L.txt
copy-as {datadir/}file1L.txt {path1/} file1.txt
test bisync run with --resync-mode=newer
bisync resync resync-mode=newer
test changed on both paths and NOT identical - file1 (file1R, file1L)
touch-glob 2001-07-23 {datadir/} file1R.txt
copy-as {datadir/}file1R.txt {path2/} file1.txt
touch-glob 2001-08-26 {datadir/} file1L.txt
copy-as {datadir/}file1L.txt {path1/} file1.txt
test bisync run with --resync-mode=path2
bisync resync resync-mode=path2
test changed on both paths and NOT identical - file1 (file1R, file1L)
touch-glob 2002-07-23 {datadir/} file1R.txt
copy-as {datadir/}file1R.txt {path2/} file1.txt
touch-glob 2002-08-26 {datadir/} file1L.txt
copy-as {datadir/}file1L.txt {path1/} file1.txt
test bisync run with --resync-mode=larger
bisync resync resync-mode=larger
test changed on both paths and NOT identical - file1 (file1R, file1L)
touch-glob 2003-07-23 {datadir/} file1R.txt
copy-as {datadir/}file1R.txt {path2/} file1.txt
touch-glob 2003-09-04 {datadir/} file1L.txt
copy-as {datadir/}file1L.txt {path1/} file1.txt
test bisync run with --resync-mode=older
bisync resync resync-mode=older
test changed on both paths and NOT identical - file1 (file1R, file1L)
touch-glob 2004-07-23 {datadir/} file1R.txt
copy-as {datadir/}file1R.txt {path2/} file1.txt
touch-glob 2004-07-23 {datadir/} file1L.txt
copy-as {datadir/}file1L.txt {path1/} file1.txt
test bisync run with --resync-mode=smaller
bisync resync resync-mode=smaller
test changed on both paths and NOT identical - file1 (file1R, file1L)
touch-glob 2005-01-02 {datadir/} file1R.txt
copy-as {datadir/}file1R.txt {path2/} file1.txt
copy-as {datadir/}file1R.txt {path1/} file2.txt
touch-glob 2006-03-04 {datadir/} file1L.txt
copy-as {datadir/}file1L.txt {path1/} file1.txt
copy-as {datadir/}file1L.txt {path2/} file2.txt
test bisync run with --resync-mode=path1
bisync resync resync-mode=path1
test no winner
touch-glob 2022-02-22 {datadir/} file1R.txt
copy-as {datadir/}file1R.txt {path2/} file1.txt
copy-as {datadir/}file1R.txt {path1/} file2.txt
touch-glob 2022-02-22 {datadir/} file1L.txt
copy-as {datadir/}file1L.txt {path1/} file1.txt
copy-as {datadir/}file1L.txt {path2/} file2.txt
test bisync run with --resync-mode=newer
bisync resync resync-mode=newer
Reference in a new issue Copy permalink