| Commit message (Collapse) | Author | Age | Files | Lines |
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And make _get_morphology_from_definitions() use it
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And make _get_morphology_from_repo() use it
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An exception will be raised if any needed networks are not started
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This saves a duplicate `git remote update origin` that was being run as
part of each chunk build. For any repos that have submodules, it also
avoids updating repos if the SHA1 we need to build is already present
locally.
As well as speeding up builds slightly, this means Morph can now build
without being connected to a network, as long as the local Git cache
all of the necessary repos and commits in the build, without needing the
'--no-git-update' option.
The code is also now in a more logical place than before.
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Since the version of btrfs-progs in the Baserock reference system
definitions was updated to v3.18.2, Morph has produced unbootable
x86 systems. This is down to lack of support for new Btrfs features
in SYSLINUX.
This patch disables the new features so that deployed systems will boot.
Although I generally don't want to have compatibility code in Morph,
this patch keeps support for the old mkfs.btrfs (which doesn't support
the commandline options that we need to pass to new mkfs.btrfs). This
will hopefully save people from suffering 'I need to use new Morph to
upgrade my devel system, but new Morph doesn't run on my devel system'.
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Checking that a given ref exists using `git rev-parse --verify
1234^{commit}` is a reasonably quick operation. As a rough guide, 1000
invocations took 1.6 seconds on my PC.
The code is too fragile and hard to reason about if we assume that one
function has been called before another so the repo will already be up
to date.
This should fix any spurious InvalidRefError exceptions that the
build graph speedups branch has introduced.
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Also, move the repo.update() call into the 'fetch from tarball' code
path in the localrepocache module -- there's no need to update straight
after doing a `git clone`, but we do need to do one if we got the repo
from a `git archive` tarball that may be out of date.
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It turns out that always looking for the chunk morph in the definitions
repo allows us to make the code a little less nasty. Bonus!
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Code in sourceresolver.py assumed that resolve_ref() would be called for
the chunk repo before get_morphology() was called, so the repo would
always be up to date. This wasn't actually true.
If your local repo cache was out of date, you might see the following
sort of error:
InvalidRefError: Git directory
/src/cache/gits/git___git_baserock_org_delta_usbutils has no commit at
ref c37f146eb2c6642c600f1b025a6d56996b0697ff^{tree}.
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This fixes the 'Morph ignores the chunk morph file I added to
definitions' regression introduced in the recent build-graph speedups
branch.
The new 'detected-chunk-buildsystems' cache associates a (chunk repo,
chunk ref) pair with the auto-detected build system. When calculating
the build graph, if the is an auto-detected build system known already,
that will be used instead of looking for a chunk morphology.
There's a flaw here: if the user added or changed the chunk morphology
in the definitions repo, the *chunk* ref won't necessarily have changed
-- so Morph will ignore the user's changes, if it had already cached an
autodetected buildsystem for that repo/ref pair.
This doesn't cost much in terms of speed because we're just reading a
file from disk. We can still avoid looking in the chunk repo for a chunk
morph, because the chunk ref would be different if something had changed
in the chunk repo.
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If you had a repo that was not in your local or remote cache in your
definitions, Morph might raise LsTreeError and abort.
The code was assuming the repo would already be cached in the local
cache by the time it got to detecting build systems, but that's not
always true -- if the (reponame, ref) pair was already in the
'resolved_trees' cache but the repo had been deleted from the local
Git cache, to name one possibility.
Also, the remoterepocache.ls_tree operation can fail if the repo is
not hosted in the Trove, so we shouldn't abort the program in that case.
Finally, this patch removes an unused variable.
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This only adds tests for the bits which were moved from
morphologyfactory into sourceresolver, namely detection
of build systems and the '_get_morphology()' function.
These are just the morphologyfactory tests reworked
slightly to work properly with the modified API.
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Most morphologies involved in a build are in the definitions repo these
days. Currently we read each of them using `git cat-file`, which is
slow. It's quicker to check out all the files in one go to a temporary
directory and then read them from there.
With the current workflow users often have definitions.git checked out
on disk. It seems strange to not just read the files from there. There
are two reasons why I don't want to do that yet:
- there are commands which don't run inside a system branch, which
would be broken if we expected to always be in a system branch
- there may be local changes in the checked-out repo, and it takes
around 5 seconds on each build to check if there aren't any local
changes. It actually seems faster to just check out a known clean
version from the cache.
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This is nice because it's fast. We don't have to copy all the Git
history along with it like we do with a clone. And it doesn't touch
any files in the cached repo.
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This will speed up builds of chunks which don't have a chunk
morph. It won't have much (if any) effect on the speed of the
first build, but subsequent builds will be much faster as we
won't have to query the git cache.
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This uses the PyLRU module, from:
<https://pypi.python.org/pypi/pylru/1.0.6>.
Python 3.2 and newer provide a built-in LRU cache, but this is
specifically for in-memory use. See <http://bugs.python.org/issue17528>.
Git commits are immutable, so caching information about their contents
is fairly easy and trouble-free. There's no danger of the cache becoming
stale.
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There's no need for this stuff to be in a separate class. This allows
integrating it with the caching in the SourceResolver class.
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This is another situation where builds could hang forever if the server
is misconfigured.
Longer term, workers should be able to come and go dynamically without
needing to reconfigure and restart the controller process.
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Reviewed by
* Pedro Alvarez
* Sam Thursfield
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network_config isn't used anywhere in this function. The purpose
of this function (getting the name of an appropriate host-only
network interface) doesn't seem to depend on it either. eth0 and
eth1 won't always be present (several Baserock systems will have
enp0s3, etc). So I think these checks should be removed.
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Currently the build commands treat the system argument
as a path relative to the root repo.
This means that regardless of your working directory you must run
morph build systems/foo-system.morph
This behaviour can be confusing, for example when your working
directory is $systembranch/definitions/systems you might expect
to be able to run
morph build foo-system.morph
especially since most shells would tab-complete the filename for you.
At the moment running the above command from $systembranch/definitions/systems
would result in an error, because morph would look for
$systembranch/definitions/foo-system.morph rather than
$systembranch/definitions/systems/foo-system.morph
This behaviour also means you can't give the morph build commands
an absolute path to a system morph.
This patch changes the treatment of the system arg so that it is interpreted
relative to the current working directory.
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Reviewed-By: Adam Coldrick <adam.coldrick@codethink.co.uk>
Reviewed-By: Richard Ipsum <richard.ipsum@codethink.co.uk>
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Not everyone is a fan of the `morph build` magic that collects up your
changes and puts them in a temporary branch. Now you can disable it by
setting 'local-changes=ignore' in your morph.conf file.
This speeds up `morph build` and `morph deploy` by 5-10 seconds on my
machine.
I looked an option to make `morph build` warn if there are uncommitted
changes. I found that with a cold cache, it takes about 5 seconds on my
machine to verify that there are no uncommitted changes to a checkout of
definitions.git. That defeats the main purpose of this patch for me, so
I didn't include the option.
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Reviewed-By: Adam Coldrick <adam.coldrick@codethink.co.uk>
Reviewed-By: Richard Maw <richard.maw@codethink.co.uk>
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There is still code here that duplicates stuff the GitDirectory class
should be doing, I think.
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This consolidates a bunch of code paths that were previously duplicated.
This also changes the API for local cached repos to match the
function names GitDirectory uses. Note that the remote repo cache still
uses the old names, and should be fixed when time permits.
Some unit tests that use the CachedRepo module required a bit of
inelegant monkey-patching in order that they continue to work. A better
way to do this would be with the 'mock' library (which would need to be
added to Baserock 'build' and 'devel' systems before we could use it).
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Reviewed-By: Pedro Alvarez <pedro.alvarez@codethink.co.uk>
Reviewed-By: Richard Ipsum <richard.ipsum@codethink.co.uk>
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Reviewed-By: Paul Sherwood <paul.sherwood@codethink.co.uk>
Reviewed-By: Sam Thursfield <sam.thursfield@codethink.co.uk>
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