Rewrite most of the documentation to be more readable and correct
(according to the current implementations).
Add a table visualizing all different locks used to synchronize
concurrent operations.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Contains a link to the 'backup' module's doc, as that explains a lot
about the inner workings of PBS and probably marks a good entry point
for new readers.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Avoid races when updating manifest data by flocking a lock file.
update_manifest is used to ensure updates always happen with the lock
held.
Snapshot deletion also acquires the lock, so it cannot interfere with an
outstanding manifest write.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
The 'Ok::<_, Self::Error>(res)' type annotation was from a time where
we could not use async, and had a combinator here which needed
explicity type information. We switched over to async in commit
91e4587343 and, as the type annotation
is already included in the Future type, we can safely drop it.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Given the .pxarexclude file
foo
/bar
The following happens:
exclude: /foo
exclude: /bar
exclude: /subdir/foo
include: /subdir/bar
since the `/bar` line is an absolute path
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Add link from encryption sentence in "What is Proxmox
Backup Server?" to the Encryption section of the docs.
Also, reword the sentence.
V2:
Clarify that encryption takes place on the client side
Signed-off-by: Dylan Whyte <d.whyte@proxmox.com>
Removing a snapshot has some more safety checks which we don't want to
ignore when removing an entire group (i.e. locking the manifest and
notifying GC).
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
There's no point in having that as a seperate method, just parse the
thing into a struct and write it back out correctly.
Also makes further changes to the method simpler.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
If we can't acquire a lock (either because the snapshot disappeared, it
is about to be forgotten/pruned, or it is currently still running) skip
the snapshot. Hold the lock during verification, so that it cannot be
deleted while we are still verifying.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
...to avoid it being forgotten or pruned while in use.
Update lock error message for deletions to be consistent.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
To allow other reading operations on the base snapshot as well. No
semantic changes with this patch alone, as all other locks on snapshots
are exclusive.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
A removal can fail if the snapshot is already gone (this is fine, our
job is done either way) or we couldn't get a lock (also fine, it can't
be removed then, just warn the user so he knows what happened and why it
wasn't removed) - keep going either way.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
A snapshot that's currently being read can still appear in the prune
list, but should not be removed.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
This adds a change-owner command to proxmox-backup-client,
that allows a caller with datastore modify privileges
to change the owner of a backup-group.
Signed-off-by: Dylan Whyte <d.whyte@proxmox.com>
To untangle the server code from the actual backup
implementation.
It would be ideal if the whole backup/ dir could become its
own crate with minimal dependencies, certainly without
depending on the actual api server. That would then also be
used more easily to create forensic tools for all the data
file types we have in the backup repositories.
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Used to not require access to the WorkerTask struct outside
the `server` and `api2` module, so it'll be easier to
separate those backup/server/client parts into separate
crates.
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This is only acquired in those two methods, both as shared. So it has
no use.
It seems, that it was planned in the past that the index deletion
should take the exclusive, while read and write takes the shared
flock on the index, as one can guess from the lock comments in commit
0465218953
But then later, in commit c8ec450e37)
the documented semantics where changed to use a temp file and do an
atomic rename instead for atomicity.
The reader shared flock on the index file was done inbetween,
probably as preparatory step, but was not removed again when strategy
was changed to using the file rename instead.
Do so now, to avoid confusion of readers and a useless flock.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
via HTTP2/backup reader protocol. they already could do so via the plain
HTTP download-file/.. API calls that the GUI uses, but the reader
environment required READ permission on the whole datastore instead of
just BACKUP on the backup group itself.
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
a reader connection should not be allowed to read arbitrary chunks in
the datastore, but only those that were previously registered by opening
the corresponding index files.
this mechanism is needed to allow unprivileged users (that don't have
full READ permissions on the whole datastore) access to their own
backups via a reader environment.
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
not triggered by any current code, but this would lead to a stack
exhaustion since borrow would call deref which would call borrow again..
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Previously only Datastore.Modify was required for creating a new
datastore.
But, that endpoint allows one to pass an arbitrary path, of which all
parent directories will be created, this can allow any user with the
"Datastore Admin" role on "/datastores" to do some damage to the
system. Further, it is effectively a side channel for revealing the
systems directory structure through educated guessing and error
handling.
Add a new privilege "Datastore.Allocate" which, for now, is used
specifically for the create datastore API endpoint.
Add it only to the "Admin" role.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
avoiding the need for reshuffling all bits when a new privilege is
added at the start or in the middle of this definition.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
If a fuse_loop instance dies suddenly (e.g. SIGKILL), the FUSE mount and
loop device assignment are left behind. We can determine this scenario
on specific unmap, when the PID file is either missing or contains a PID
of a non-running process, but the backing file and potentially loop
device are still there.
If that's the case, do an "emergency cleanup", by unassigning the
loopdev, calling 'fusermount -u' and then cleaning any leftover files
manually.
With this in place, pretty much any situation is now recoverable via
only the 'proxmox-backup-client' binary, by either calling 'unmap' with
or without parameters.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
