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b2: Add b2-version-at flag to show file versions at time

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Uses b2_list_file_versions to retrieve all file versions, and returns
the one that was active at the specified time

This is especially useful in combination with other backup tools, such
as restic, which may use rclone as a backend.
This commit is contained in:
SwazRGB 2022-03-15 04:55:20 +01:00 committed by Nick Craig-Wood
parent a8cd18faf3
commit 4cebade95d
2 changed files with 37 additions and 2 deletions
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34
backend/b2/b2.go
View File

@ -64,7 +64,8 @@ const (
// Globals
var (
errNotWithVersions = errors.New("can't modify or delete files in --b2-versions mode")
errNotWithVersions = errors.New("can't modify or delete files in --b2-versions mode")
errNotWithVersionAt = errors.New("can't modify or delete files in --b2-version-at mode")
)
// Register with Fs
@ -106,6 +107,11 @@ in the [b2 integrations checklist](https://www.backblaze.com/b2/docs/integration
Help: "Include old versions in directory listings.\n\nNote that when using this no file write operations are permitted,\nso you can't upload files or delete them.",
Default: false,
Advanced: true,
}, {
Name: "version_at",
Help: "Show file versions as they were at the specified time.\n\nNote that when using this no file write operations are permitted,\nso you can't upload files or delete them.",
Default: fs.Time{},
Advanced: true,
}, {
Name: "hard_delete",
Help: "Permanently delete files on remote removal, otherwise hide files.",
@ -211,6 +217,7 @@ type Options struct {
Endpoint string `config:"endpoint"`
TestMode string `config:"test_mode"`
Versions bool `config:"versions"`
VersionAt fs.Time `config:"version_at"`
HardDelete bool `config:"hard_delete"`
UploadCutoff fs.SizeSuffix `config:"upload_cutoff"`
CopyCutoff fs.SizeSuffix `config:"copy_cutoff"`
@ -696,9 +703,12 @@ func (f *Fs) list(ctx context.Context, bucket, directory, prefix string, addBuck
Method: "POST",
Path: "/b2_list_file_names",
}
if hidden {
if hidden || f.opt.VersionAt.IsSet() {
opts.Path = "/b2_list_file_versions"
}
lastFileName := ""
for {
var response api.ListFileNamesResponse
err := f.pacer.Call(func() (bool, error) {
@ -728,7 +738,21 @@ func (f *Fs) list(ctx context.Context, bucket, directory, prefix string, addBuck
if addBucket {
remote = path.Join(bucket, remote)
}
if f.opt.VersionAt.IsSet() {
if time.Time(file.UploadTimestamp).After(time.Time(f.opt.VersionAt)) {
// Ignore versions that were created after the specified time
continue
}
if file.Name == lastFileName {
// Ignore versions before the already returned version
continue
}
}
// Send object
lastFileName = file.Name
err = fn(remote, file, isDirectory)
if err != nil {
if err == errEndList {
@ -1828,6 +1852,9 @@ func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, op
if o.fs.opt.Versions {
return errNotWithVersions
}
if o.fs.opt.VersionAt.IsSet() {
return errNotWithVersionAt
}
size := src.Size()
bucket, bucketPath := o.split()
@ -1983,6 +2010,9 @@ func (o *Object) Remove(ctx context.Context) error {
if o.fs.opt.Versions {
return errNotWithVersions
}
if o.fs.opt.VersionAt.IsSet() {
return errNotWithVersionAt
}
if o.fs.opt.HardDelete {
return o.fs.deleteByID(ctx, o.id, bucketPath)
}

5
docs/content/b2.md
View File

@ -173,6 +173,11 @@ the file instead of hiding it.
Old versions of files, where available, are visible using the
`--b2-versions` flag.
It is also possible to view a bucket as it was at a certain point in time,
using the `--b2-version-at` flag. This will show the file versions as they
were at that time, showing files that have been deleted afterwards, and
hiding files that were created since.
If you wish to remove all the old versions then you can use the
`rclone cleanup remote:bucket` command which will delete all the old
versions of files, leaving the current ones intact. You can also