refs: do not use peeled OID if peeling to a tag - #4367
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Fixes #4355 |
If a reference stored in a packed-refs file does not directly point to a commit, tree or blob, the packed-refs file will also will include a fully-peeled OID pointing to the first underlying object of that type. If we try to peel a reference to an object, we will use that peeled OID to speed up resolving the object. As a reference for an annotated tag does not directly point to a commit, tree or blob but instead to the tag object, the packed-refs file will have an accomodating fully-peeled OID pointing to the object referenced by that tag. When we use the fully-peeled OID pointing to the referenced object when peeling, we obviously cannot peel that to the tag anymore. Fix this issue by not using the fully-peeled OID whenever we want to peel to a tag. Note that this does not include the case where we want to resolve to _any_ object type. Existing code may make use from the fact that we resolve those to commit objects instead of tag objects, even though that behaviour is inconsistent between packed and loose references. Furthermore, some tests of ours make the assumption that we in fact resolve those references to a commit.
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If a reference stored inside of the packed-refs file does not directly
point to a commit object, it will always have a fully-peeled value
pointing to the underlying commit object. If we peel a reference to an
object, we will use that peeled value to speed up resolving the object.
This works as intended for all objects, except for annotated tags.
As a reference for an annotated tag does not directly point to the
commit but instead to the tag object, the packed-refs file will have an
accomodating fully-peeled object ID pointing to the commit of that tag.
When we use that fully-peeled OID pointing to that commit, though, we
obviously cannot peel that to the tag anymore.
Fix this issue by not using the fully-peeled OID whenever we want to
peel to a tag. Note that this does not include the case where we want to
resolve to any object type. Existing code may make use from the fact
that we resolve those to commit objects instead of tag objects, even
though that behaviour is inconsistent between packed and loose
references. Furthermore, some tests of ours make the assumption that we
in fact resolve those references to a commit.