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A partial clone with missing trees can be obtained using "git clone --filter=tree:none <repo>". In such a repository, when a tree needs to be lazily fetched, any tree or blob it directly or indirectly references is fetched as well, regardless of whether the original command required those objects, or if the local repository already had some of them. This is because the fetch protocol, which the lazy fetch uses, does not allow clients to request that only the wanted objects be sent, which would be the ideal solution. This patch implements a partial solution: specify the "blob:none" filter, somewhat reducing the fetch payload. This change has no effect when lazily fetching blobs (due to how filters work). And if lazily fetching a commit (such repositories are difficult to construct and is not a use case we support very well, but it is possible), referenced commits and trees are still fetched - only the blobs are not fetched. The necessary code change is done in fetch_pack() instead of somewhere closer to where the "filter" instruction is written to the wire so that only one part of the code needs to be changed in order for users of all protocol versions to benefit from this optimization. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
#ifndef FETCH_PACK_H
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#define FETCH_PACK_H
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#include "string-list.h"
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#include "run-command.h"
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#include "protocol.h"
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#include "list-objects-filter-options.h"
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struct oid_array;
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struct fetch_pack_args {
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const char *uploadpack;
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int unpacklimit;
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int depth;
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const char *deepen_since;
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const struct string_list *deepen_not;
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struct list_objects_filter_options filter_options;
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const struct string_list *server_options;
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/*
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* If not NULL, during packfile negotiation, fetch-pack will send "have"
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* lines only with these tips and their ancestors.
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*/
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const struct oid_array *negotiation_tips;
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unsigned deepen_relative:1;
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unsigned quiet:1;
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unsigned keep_pack:1;
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unsigned lock_pack:1;
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unsigned use_thin_pack:1;
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unsigned fetch_all:1;
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unsigned stdin_refs:1;
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unsigned diag_url:1;
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unsigned verbose:1;
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unsigned no_progress:1;
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unsigned include_tag:1;
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unsigned stateless_rpc:1;
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unsigned check_self_contained_and_connected:1;
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unsigned self_contained_and_connected:1;
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unsigned cloning:1;
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unsigned update_shallow:1;
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unsigned deepen:1;
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unsigned from_promisor:1;
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/*
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* Attempt to fetch only the wanted objects, and not any objects
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* referred to by them. Due to protocol limitations, extraneous
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* objects may still be included. (When fetching non-blob
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* objects, only blobs are excluded; when fetching a blob, the
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* blob itself will still be sent. The client does not need to
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* know whether a wanted object is a blob or not.)
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*
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* If 1, fetch_pack() will also not modify any object flags.
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* This allows fetch_pack() to safely be called by any function,
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* regardless of which object flags it uses (if any).
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*/
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unsigned no_dependents:1;
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/*
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* Because fetch_pack() overwrites the shallow file upon a
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* successful deepening non-clone fetch, if this struct
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* specifies such a fetch, fetch_pack() needs to perform a
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* connectivity check before deciding if a fetch is successful
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* (and overwriting the shallow file). fetch_pack() sets this
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* field to 1 if such a connectivity check was performed.
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*
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* This is different from check_self_contained_and_connected
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* in that the former allows existing objects in the
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* repository to satisfy connectivity needs, whereas the
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* latter doesn't.
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*/
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unsigned connectivity_checked:1;
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};
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/*
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* sought represents remote references that should be updated from.
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* On return, the names that were found on the remote will have been
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* marked as such.
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*/
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struct ref *fetch_pack(struct fetch_pack_args *args,
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int fd[], struct child_process *conn,
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const struct ref *ref,
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const char *dest,
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struct ref **sought,
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int nr_sought,
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struct oid_array *shallow,
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char **pack_lockfile,
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enum protocol_version version);
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/*
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* Print an appropriate error message for each sought ref that wasn't
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* matched. Return 0 if all sought refs were matched, otherwise 1.
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*/
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int report_unmatched_refs(struct ref **sought, int nr_sought);
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#endif
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