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restic/changelog/unreleased/issue-1542

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backup: add --dry-run/-n flag to show what would happen. This can be used to check how large a backup is or validate exclusions. It does not actually write any data to the underlying backend. This is implemented as a simple overlay backend that accepts writes without forwarding them, passes through reads, and generally does the minimal necessary to pretend that progress is actually happening. Fixes #1542 Example usage: $ restic -vv --dry-run . | grep add new /changelog/unreleased/issue-1542, saved in 0.000s (350 B added) modified /cmd/restic/cmd_backup.go, saved in 0.000s (16.543 KiB added) modified /cmd/restic/global.go, saved in 0.000s (0 B added) new /internal/backend/dry/dry_backend_test.go, saved in 0.000s (3.866 KiB added) new /internal/backend/dry/dry_backend.go, saved in 0.000s (3.744 KiB added) modified /internal/backend/test/tests.go, saved in 0.000s (0 B added) modified /internal/repository/repository.go, saved in 0.000s (20.707 KiB added) modified /internal/ui/backup.go, saved in 0.000s (9.110 KiB added) modified /internal/ui/jsonstatus/status.go, saved in 0.001s (11.055 KiB added) modified /restic, saved in 0.131s (25.542 MiB added) Would add to the repo: 25.892 MiB
2019-06-13 03:39:13 +00:00
Enhancement: Add --dry-run/-n option to backup command.
We added a new --dry-run/-n option to backup, which performs all the normal
steps of a backup without actually writing data. Passing -vv will log
information about files that would be added, allowing fast verification of
backup options without any unnecessary write activity.
https://github.com/restic/restic/issues/1542
https://github.com/restic/restic/pull/2308
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