clone: prevent --reference to a shallow repository
If we borrow objects from another repository, we should also pay attention to their $GIT_DIR/shallow (and even info/grafts). But current alternates code does not. Reject alternate repos that are shallow because we do not do it right. In future the alternate code may be updated to check $GIT_DIR/shallow properly so that this restriction could be lifted. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -252,6 +252,12 @@ static int add_one_reference(struct string_list_item *item, void *cb_data)
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die(_("reference repository '%s' is not a local repository."),
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item->string);
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if (!access(mkpath("%s/shallow", ref_git), F_OK))
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die(_("reference repository '%s' is shallow"), item->string);
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if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
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die(_("reference repository '%s' is grafted"), item->string);
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strbuf_addf(&alternate, "%s/objects", ref_git);
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add_to_alternates_file(alternate.buf);
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strbuf_release(&alternate);
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