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backup: add --dry-run/-n flag to show what would happen.

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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
This commit is contained in:
Ryan Hitchman
2019-06-12 20:39:13 -07:00
committed by Michael Eischer
parent 533ac4fd95
commit 77bf148460
9 changed files with 405 additions and 3 deletions
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changelog/unreleased/issue-1542 Normal file
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@@ -0,0 +1,9 @@
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