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We assumed that the sha1 of the tree of the commit of the ref we care
about was sufficient to cache, but `git replace` means that you need to
know the state of other branches too, since anything in refs/replace can
completely change what the tree you check-out is.
This behaviour can be disabled globally by setting
GIT_NO_REPLACE_OBJECTS, so we're going to do that.
If we need to integrate a project that uses git-replace to change the
contents of their git trees then we could support that by:
if any(refs/replace/*):
potentially_replacable_objects = [
`git rev-parse HEAD`,
`git rev-parse HEAD^{commit}`,
`git rev-parse HEAD^{tree}`]
potentially_replacable_objects.extend(
`git ls-tree -r HEAD | awk '{print $3}'`)
# NOTE: doesn't handle submodules, and you'd need to expand this
# set whenever you process a replacement
for object in refs/replace/*:
if basename(object) not in potentially_replacable_objects: continue
cache_key['replacements'][basename(object)] = `git rev-parse $object`
If we were to support this would need to traverse the tree anyway, doing
replacements, so we may as well use libgit to do the checkout anyway,
and list which replacements were used.
However, since the expected use-case of `git replace` is as a better way
to do history grafting, we're unlikely to need it, as it would only have
any effect if it replaced the commit we were using with a different one.
Rubber-stamped-by: Daniel Silverstone
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Now it will optionally clean up on success based on a constructor
parameter.
It can be later cleaned up explicitly by calling close().
It is called close, rather than something more obvious, like cleanup(),
since it means the manager can be re-used with contextlib.closing().
This now means that using the Managers without a context manager is less
ugly, since you can explicitly call .close() in a finally block.
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This adds a LocalRefManager, which handles ref updates to local
repositories (i.e. your workspace).
It provides proxy methods for ref updates to a set of repositories.
If an exception occurs in the body of the context manager, the updates
will be rolled back to before the context manager was entered.
The purpose for using a LocalRefManager instead of making the changes to
the repositories directly, is to provide atomic updates to a set of refs
in a set of repositories, where all refs are updated, or none are.
This also adds a RemoteRefManager, which handles pushing branches to
remote repositories.
It provides a proxy push method, which will delete pushed branches, and
re-push deleted branches after the context manager exits.
Its purpose, instead of providing atomic updates to remote repositories,
is to provide temporary branches. This is because it is used to provide
temporary build branches. The difference between atomic update and
temporary push, is that the remote branches are deleted when the context
is left, rather than kept, as LocalRefManager does.
The RemoteRefManager currently cannot provide the same atomicity
guarantees as the LocalRefManager, so if there is a push between the
branch being created and the RemoteRefManager cleaning it up, that change
is lost without RemoteRefManager even knowing it existed.
Git 1.8.5 will add functionality to make this possible.
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