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#ifndef TRANSPORT_H
#define TRANSPORT_H

#include "cache.h"
#include "run-command.h"
#include "remote.h"
#include "list-objects-filter-options.h"
#include "string-list.h"

struct git_transport_options {
	unsigned thin : 1;
	unsigned keep : 1;
	unsigned followtags : 1;
	unsigned check_self_contained_and_connected : 1;
	unsigned self_contained_and_connected : 1;
	unsigned update_shallow : 1;
	unsigned reject_shallow : 1;
	unsigned deepen_relative : 1;

	/* see documentation of corresponding flag in fetch-pack.h */
	unsigned from_promisor : 1;

	/*
	 * If this transport supports connect or stateless-connect,
	 * the corresponding field in struct fetch_pack_args is copied
	 * here after fetching.
	 *
	 * See the definition of connectivity_checked in struct
	 * fetch_pack_args for more information.
	 */
	unsigned connectivity_checked:1;

	int depth;
	const char *deepen_since;
	const struct string_list *deepen_not;
	const char *uploadpack;
	const char *receivepack;
	struct push_cas_option *cas;
	struct list_objects_filter_options filter_options;

	/*
	 * This is only used during fetch. See the documentation of
	 * negotiation_tips in struct fetch_pack_args.
	 *
	 * This field is only supported by transports that support connect or
	 * stateless_connect. Set this field directly instead of using
	 * transport_set_option().
	 */
	struct oid_array *negotiation_tips;
};

enum transport_family {
	TRANSPORT_FAMILY_ALL = 0,
	TRANSPORT_FAMILY_IPV4,
	TRANSPORT_FAMILY_IPV6
};

struct transport {
	const struct transport_vtable *vtable;

	struct remote *remote;
	const char *url;
	void *data;
	const struct ref *remote_refs;

	/**
	 * Indicates whether we already called get_refs_list(); set by
	 * transport.c::transport_get_remote_refs().
	 */
	unsigned got_remote_refs : 1;

	/*
	 * Transports that call take-over destroys the data specific to
	 * the transport type while doing so, and cannot be reused.
	 */
	unsigned cannot_reuse : 1;

	/*
	 * A hint from caller that it will be performing a clone, not
	 * normal fetch. IOW the repository is guaranteed empty.
	 */
	unsigned cloning : 1;

	/*
	 * Indicates that the transport is connected via a half-duplex
	 * connection and should operate in stateless-rpc mode.
	 */
	unsigned stateless_rpc : 1;

	/*
	 * These strings will be passed to the {pre, post}-receive hook,
	 * on the remote side, if both sides support the push options capability.
	 */
	const struct string_list *push_options;

	/*
	 * These strings will be passed to the remote side on each command
	 * request, if both sides support the server-option capability.
	 */
	const struct string_list *server_options;

	struct string_list pack_lockfiles;

	signed verbose : 3;
	/**
	 * Transports should not set this directly, and should use this
	 * value without having to check isatty(2), -q/--quiet
	 * (transport->verbose < 0), etc. - checking has already been done
	 * in transport_set_verbosity().
	 **/
	unsigned progress : 1;
	/*
	 * If transport is at least potentially smart, this points to
	 * git_transport_options structure to use in case transport
	 * actually turns out to be smart.
	 */
	struct git_transport_options *smart_options;

	enum transport_family family;

	const struct git_hash_algo *hash_algo;
};

#define TRANSPORT_PUSH_ALL			(1<<0)
#define TRANSPORT_PUSH_FORCE			(1<<1)
#define TRANSPORT_PUSH_DRY_RUN			(1<<2)
#define TRANSPORT_PUSH_MIRROR			(1<<3)
#define TRANSPORT_PUSH_PORCELAIN		(1<<4)
#define TRANSPORT_PUSH_SET_UPSTREAM		(1<<5)
#define TRANSPORT_RECURSE_SUBMODULES_CHECK	(1<<6)
#define TRANSPORT_PUSH_PRUNE			(1<<7)
#define TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND	(1<<8)
#define TRANSPORT_PUSH_NO_HOOK			(1<<9)
#define TRANSPORT_PUSH_FOLLOW_TAGS		(1<<10)
#define TRANSPORT_PUSH_CERT_ALWAYS		(1<<11)
#define TRANSPORT_PUSH_CERT_IF_ASKED		(1<<12)
#define TRANSPORT_PUSH_ATOMIC			(1<<13)
#define TRANSPORT_PUSH_OPTIONS			(1<<14)
#define TRANSPORT_RECURSE_SUBMODULES_ONLY	(1<<15)
#define TRANSPORT_PUSH_FORCE_IF_INCLUDES	(1<<16)

int transport_summary_width(const struct ref *refs);

/* Returns a transport suitable for the url */
struct transport *transport_get(struct remote *, const char *);

/*
 * Check whether a transport is allowed by the environment.
 *
 * Type should generally be the URL scheme, as described in
 * Documentation/git.txt
 *
 * from_user specifies if the transport was given by the user.  If unknown pass
 * a -1 to read from the environment to determine if the transport was given by
 * the user.
 *
 */
int is_transport_allowed(const char *type, int from_user);

/*
 * Check whether a transport is allowed by the environment,
 * and die otherwise.
 */
void transport_check_allowed(const char *type);

/* Transport options which apply to git:// and scp-style URLs */

/* The program to use on the remote side to send a pack */
#define TRANS_OPT_UPLOADPACK "uploadpack"

/* The program to use on the remote side to receive a pack */
#define TRANS_OPT_RECEIVEPACK "receivepack"

/* Transfer the data as a thin pack if not null */
#define TRANS_OPT_THIN "thin"

/* Check the current value of the remote ref */
#define TRANS_OPT_CAS "cas"

/* Keep the pack that was transferred if not null */
#define TRANS_OPT_KEEP "keep"

/* Limit the depth of the fetch if not null */
#define TRANS_OPT_DEPTH "depth"

/* Limit the depth of the fetch based on time if not null */
#define TRANS_OPT_DEEPEN_SINCE "deepen-since"

/* Limit the depth of the fetch based on revs if not null */
#define TRANS_OPT_DEEPEN_NOT "deepen-not"

/* Limit the deepen of the fetch if not null */
#define TRANS_OPT_DEEPEN_RELATIVE "deepen-relative"

/* Aggressively fetch annotated tags if possible */
#define TRANS_OPT_FOLLOWTAGS "followtags"

/* Reject shallow repo transport */
#define TRANS_OPT_REJECT_SHALLOW "rejectshallow"

/* Accept refs that may update .git/shallow without --depth */
#define TRANS_OPT_UPDATE_SHALLOW "updateshallow"

/* Send push certificates */
#define TRANS_OPT_PUSH_CERT "pushcert"

/* Indicate that these objects are being fetched by a promisor */
#define TRANS_OPT_FROM_PROMISOR "from-promisor"

/* Filter objects for partial clone and fetch */
#define TRANS_OPT_LIST_OBJECTS_FILTER "filter"

/* Request atomic (all-or-nothing) updates when pushing */
#define TRANS_OPT_ATOMIC "atomic"

/* Require remote changes to be integrated locally. */
#define TRANS_OPT_FORCE_IF_INCLUDES "force-if-includes"

/**
 * Returns 0 if the option was used, non-zero otherwise. Prints a
 * message to stderr if the option is not used.
 **/
int transport_set_option(struct transport *transport, const char *name,
			 const char *value);
void transport_set_verbosity(struct transport *transport, int verbosity,
	int force_progress);

#define REJECT_NON_FF_HEAD      0x01
#define REJECT_NON_FF_OTHER     0x02
#define REJECT_ALREADY_EXISTS   0x04
#define REJECT_FETCH_FIRST      0x08
#define REJECT_NEEDS_FORCE      0x10
#define REJECT_REF_NEEDS_UPDATE 0x20

int transport_push(struct repository *repo,
		   struct transport *connection,
		   struct refspec *rs, int flags,
		   unsigned int * reject_reasons);

struct transport_ls_refs_options {
	/*
	 * Optionally, a list of ref prefixes can be provided which can be sent
	 * to the server (when communicating using protocol v2) to enable it to
	 * limit the ref advertisement.  Since ref filtering is done on the
	 * server's end (and only when using protocol v2),
	 * transport_get_remote_refs() could return refs which don't match the
	 * provided ref_prefixes.
	 */
	struct strvec ref_prefixes;

	/*
	 * If unborn_head_target is not NULL, and the remote reports HEAD as
	 * pointing to an unborn branch, transport_get_remote_refs() stores the
	 * unborn branch in unborn_head_target. It should be freed by the
	 * caller.
	 */
	char *unborn_head_target;
};
#define TRANSPORT_LS_REFS_OPTIONS_INIT { STRVEC_INIT }

/*
 * Retrieve refs from a remote.
 */
const struct ref *transport_get_remote_refs(struct transport *transport,
					    struct transport_ls_refs_options *transport_options);

/*
 * Fetch the hash algorithm used by a remote.
 *
 * This can only be called after fetching the remote refs.
 */
const struct git_hash_algo *transport_get_hash_algo(struct transport *transport);
int transport_fetch_refs(struct transport *transport, struct ref *refs);
void transport_unlock_pack(struct transport *transport);
int transport_disconnect(struct transport *transport);
char *transport_anonymize_url(const char *url);
void transport_take_over(struct transport *transport,
			 struct child_process *child);

int transport_connect(struct transport *transport, const char *name,
		      const char *exec, int fd[2]);

/* Transport methods defined outside transport.c */
int transport_helper_init(struct transport *transport, const char *name);
int bidirectional_transfer_loop(int input, int output);

/* common methods used by transport.c and builtin/send-pack.c */
void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose);

int transport_refs_pushed(struct ref *ref);

void transport_print_push_status(const char *dest, struct ref *refs,
		  int verbose, int porcelain, unsigned int *reject_reasons);

/* common method used by transport-helper.c and send-pack.c */
void reject_atomic_push(struct ref *refs, int mirror_mode);

#endif
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