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When the commit graph and generation numbers were introduced in commits177722b344(commit: integrate commit graph with commit parsing, 2018-04-10) and83073cc994(commit: add generation number to struct commit, 2018-04-25), they tried to make sure that the corresponding 'graph_pos' and 'generation' fields of 'struct commit' are initialized conservatively, as if the commit were not included in the commit-graph file. Alas, initializing those fields only in alloc_commit_node() missed the case when an object that happens to be a commit is first looked up via lookup_unknown_object(), and is then later converted to a 'struct commit' via the object_as_type() helper function (either calling it directly, or as part of a subsequent lookup_commit() call). Consequently, both of those fields incorrectly remain set to zero, which means e.g. that the commit is present in and is the first entry of the commit-graph file. This will result in wrong timestamp, parent and root tree hashes, if such a 'struct commit' instance is later filled from the commit-graph. Extract the initialization of 'struct commit's fields from alloc_commit_node() into a helper function, and call it from object_as_type() as well, to make sure that it properly initializes the two commit-graph-related fields, too. With this helper function it is hopefully less likely that any new fields added to 'struct commit' in the future would remain uninitialized. With this change alloc_commit_index() won't have any remaining callers outside of 'alloc.c', so mark it as static. Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
22 lines
549 B
C
22 lines
549 B
C
#ifndef ALLOC_H
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#define ALLOC_H
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struct alloc_state;
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struct tree;
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struct commit;
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struct tag;
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struct repository;
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void *alloc_blob_node(struct repository *r);
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void *alloc_tree_node(struct repository *r);
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void init_commit_node(struct repository *r, struct commit *c);
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void *alloc_commit_node(struct repository *r);
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void *alloc_tag_node(struct repository *r);
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void *alloc_object_node(struct repository *r);
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void alloc_report(struct repository *r);
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struct alloc_state *allocate_alloc_state(void);
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void clear_alloc_state(struct alloc_state *s);
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#endif
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