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c23f592117
When the content at a given bundle URI is not understood as a bundle (based on inspecting the initial content), then Git currently gives up and ignores that content. Independent bundle providers may want to split up the bundle content into multiple bundles, but still make them available from a single URI. Teach Git to attempt parsing the bundle URI content as a Git config file providing the key=value pairs for a bundle list. Git then looks at the mode of the list to see if ANY single bundle is sufficient or if ALL bundles are required. The content at the selected URIs are downloaded and the content is inspected again, creating a recursive process. To guard the recursion against malformed or malicious content, limit the recursion depth to a reasonable four for now. This can be converted to a configured value in the future if necessary. The value of four is twice as high as expected to be useful (a bundle list is unlikely to point to more bundle lists). To test this scenario, create an interesting bundle topology where three incremental bundles are built on top of a single full bundle. By using a merge commit, the two middle bundles are "independent" in that they do not require each other in order to unbundle themselves. They each only need the base bundle. The bundle containing the merge commit requires both of the middle bundles, though. This leads to some interesting decisions when unbundling, especially when we later implement heuristics that promote downloading bundles until the prerequisite commits are satisfied. Signed-off-by: Derrick Stolee <derrickstolee@github.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
#ifndef BUNDLE_URI_H
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#define BUNDLE_URI_H
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#include "hashmap.h"
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#include "strbuf.h"
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struct repository;
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struct string_list;
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/**
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* The remote_bundle_info struct contains information for a single bundle
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* URI. This may be initialized simply by a given URI or might have
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* additional metadata associated with it if the bundle was advertised by
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* a bundle list.
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*/
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struct remote_bundle_info {
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struct hashmap_entry ent;
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/**
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* The 'id' is a name given to the bundle for reference
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* by other bundle infos.
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*/
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char *id;
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/**
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* The 'uri' is the location of the remote bundle so
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* it can be downloaded on-demand. This will be NULL
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* if there was no table of contents.
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*/
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char *uri;
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/**
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* If the bundle has been downloaded, then 'file' is a
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* filename storing its contents. Otherwise, 'file' is
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* NULL.
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*/
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char *file;
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/**
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* If the bundle has been unbundled successfully, then
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* this boolean is true.
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*/
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unsigned unbundled:1;
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};
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#define REMOTE_BUNDLE_INFO_INIT { 0 }
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enum bundle_list_mode {
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BUNDLE_MODE_NONE = 0,
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BUNDLE_MODE_ALL,
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BUNDLE_MODE_ANY
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};
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/**
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* A bundle_list contains an unordered set of remote_bundle_info structs,
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* as well as information about the bundle listing, such as version and
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* mode.
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*/
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struct bundle_list {
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int version;
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enum bundle_list_mode mode;
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struct hashmap bundles;
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};
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void init_bundle_list(struct bundle_list *list);
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void clear_bundle_list(struct bundle_list *list);
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typedef int (*bundle_iterator)(struct remote_bundle_info *bundle,
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void *data);
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int for_all_bundles_in_list(struct bundle_list *list,
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bundle_iterator iter,
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void *data);
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struct FILE;
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void print_bundle_list(FILE *fp, struct bundle_list *list);
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/**
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* A bundle URI may point to a bundle list where the key=value
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* pairs are provided in config file format. This method is
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* exposed publicly for testing purposes.
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*/
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int bundle_uri_parse_config_format(const char *uri,
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const char *filename,
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struct bundle_list *list);
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/**
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* Fetch data from the given 'uri' and unbundle the bundle data found
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* based on that information.
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*
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* Returns non-zero if no bundle information is found at the given 'uri'.
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*/
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int fetch_bundle_uri(struct repository *r, const char *uri);
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/**
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* General API for {transport,connect}.c etc.
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*/
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/**
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* Parse a "key=value" packet line from the bundle-uri verb.
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*
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* Returns 0 on success and non-zero on error.
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*/
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int bundle_uri_parse_line(struct bundle_list *list,
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const char *line);
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#endif
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