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It's expected to be able to switch to something different when
rebasing, even if the current origin has unconfigured-state.
Closes#232
Pull request: #238
Approved by: jlebon
While I was debugging the tests, I wanted to run the daemon
interactively under gdb but still on the session. In our previous
logic this was only possible if we were exec'd by dbus-daemon which
made attaching gdb annoying.
Let's honor the environment variable consistently on client and
server.
Now that the internal reading methods operate on the mainloop, and we
know there can only be one write transaction at a time, it should be
safe to drop the internal mutexes (and multithreading).
Updates to the `OstreeSysroot` instance and DBus API all happen off
the mainloop now. The write transactions now use a separate
`OstreeSysroot` instance, and do not perform any changes to process
state on their own. We always reload state from disk.
I think this is a lot simpler to reason about from a correctness point
of view, at a likely negligble loss in performance for read
transactions.
I'd like to move towards a model where internal worker threads don't
touch the "main context data", i.e. we only use message passing (via
main contexts). This means we wouldn't use a mutex.
I find this model to be significantly simpler to reason about.
Every transaction runs in a thread now, and there's no real drawback
to consistently creating a main context to go with it always. Most
of the transaction types now do a pull, which needs it.
Now that we have `ostree_sysroot_load_if_changed()`, we know more
precisely (and cheaply) when things change. Use inotify to detect
changes as before, but we don't need a timeout because all we do is
call `fstatat()` which is basically free; the inode is going to be in
memory.
This will hopefully help with
https://github.com/projectatomic/rpm-ostree/issues/220
but more investigation is needed.
We were loading the list of osnames by walking the FS, but it's a lot
simpler to just extract the set of known osnames from the deployment
array.
This is part of an effort to unify the "sync cached state with disk"
code in order to address race conditions.
We can't rely on the the GLib hash functions not changing (or being
stable across host systems). Basically here we have a "stringified"
deployment...it might be simpler to just declare this stable.
There are many reasons why the daemon may not be able to start up. An
initialization error doesn't/shouldn't reflect a programming mistake,
but instead a runtime issue in the environment.
Thus, if we fail to start the daemon, we shouldn't use g_error(), which
dumps core. We should instead print the GError and clean up as nicely as
we can.
Resolves https://github.com/projectatomic/rpm-ostree/issues/194.
Determines a revision argument to either be a SHA256 checksum or a version
metadata value.
The revision string may have a "revision=" prefix to denote a SHA256
checksum, or a "version=" prefix to denote a version metadata value. If
the revision string lacks either prefix, the function attempts to infer
the type of revision. The prefixes are case-insensitive.
rpmostreed_commit_generate_cached_details_variant() returns NULL if the
origin checksum of an OstreeDeployment matches the checksum of a refspec,
which may also be the OstreeDeployment's origin.
I don't understand the reasoning for that, especially since none of the
callers are prepared to deal with a NULL return. Nor is there a comment,
so remove the check.
This was making the daemon crash on
rpm-ostree deploy --preview <current-deployment-checksum>
which should just indicate no package differences.
Deploy method locks the deployment at a particular commit by adding an
"override-commit" line to the origin file.
Upgrade method must undo the override so we always upgrade to the latest
available commit.
Deploy(revision) pulls and deploys a particular revision on the
branch of the currently booted deployment. The revision can be
expressed as a SHA256 checksum or as a version metadata value.
Similar to rpmostreed_repo_lookup_version(), except without pulling from
a remote repository. It traverses whatever commits are available in the
local repository.
rpmostreed_repo_pull_ancestry() downloads an ancestry of commit objects
starting from a given refspec. An optional visitor function is called
for each commit object. The visitor function can stop the recursion,
such as when looking for a particular commit.
rpmostreed_repo_lookup_version() builds on this by supplying a visitor
function that examines commit metadata for a particular version value.
When the version value is found, the commit's checksum is returned to
the caller.
Allows clients to see version, timestamp
and other detailed information along with
the rpm diffs for cached updates and rebases.
This will be used by the Cockpit interface.
Adds a CachedUpdate property that allows clients
to see version, timestamp and other detailed
information for pending updates. Additionally
changes to this property signal clients that a
new rpm-diff can be fetched with GetCachedUpdateRpmDiff.
This will be used by the Cockpit interface.
Various OS "diff" methods can run concurrently with whatever else is
going on since they don't have to obtain the system root lock.
Just to make sure there's no conflicts when writing deployments or
downloading RPM package details, use an internal reader/writer lock
to protect the critical sections of upgrade, rebase, rollback, etc.
Create and load a new OstreeSysroot and OstreeRepo instance as needed.
This ensures its internal state is up-to-date, since several ostree
commands can alter stored state without the daemon's knowledge.
I would prefer keeping persistent instances if these issues can be
addressed, as it would eliminate some inconvenient error handling.
But this way is safer for now.
Having the OS.Upgrade() and OS.Rebase() logic flows conflated in the
daemon had me nervous. A day's worth of debugging a failing test case
proved that nervousness well-founded. Split them into distinct backend
operations.
So the client side can read it back.
This replaces the GObject "sysroot-path" property in the wrapper class,
which created some additional daemon refactoring.
This closes a race condition where the objects might not be exported
by the time clients call methods.
Also delete the code in the "on name lost" handler - it's not going to
happen in practice (we don't allow replacement), and causes issues as
it may be run first before we get the notification that the name is
owned. github.com/cockpit-project/storaged has some better code here
which we could copy later.
This then in turn allows us to delete the "hold"/"release"
infrastructure. Basically the daemon will live forever in the
process.
