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#include "cache.h"
#include "commit.h"
#include "config.h"
#include "revision.h"
#include "argv-array.h"
#include "list-objects.h"
#include "list-objects-filter.h"
#include "list-objects-filter-options.h"
#include "promisor-remote.h"

/*
 * Parse value of the argument to the "filter" keyword.
 * On the command line this looks like:
 *       --filter=<arg>
 * and in the pack protocol as:
 *       "filter" SP <arg>
 *
 * The filter keyword will be used by many commands.
 * See Documentation/rev-list-options.txt for allowed values for <arg>.
 *
 * Capture the given arg as the "filter_spec".  This can be forwarded to
 * subordinate commands when necessary (although it's better to pass it through
 * expand_list_objects_filter_spec() first).  We also "intern" the arg for the
 * convenience of the current command.
 */
static int gently_parse_list_objects_filter(
	struct list_objects_filter_options *filter_options,
	const char *arg,
	struct strbuf *errbuf)
{
	const char *v0;

	if (!arg)
		return 0;

	if (filter_options->choice) {
		if (errbuf) {
			strbuf_addstr(
				errbuf,
				_("multiple filter-specs cannot be combined"));
		}
		return 1;
	}

	filter_options->filter_spec = strdup(arg);

	if (!strcmp(arg, "blob:none")) {
		filter_options->choice = LOFC_BLOB_NONE;
		return 0;

	} else if (skip_prefix(arg, "blob:limit=", &v0)) {
		if (git_parse_ulong(v0, &filter_options->blob_limit_value)) {
			filter_options->choice = LOFC_BLOB_LIMIT;
			return 0;
		}

	} else if (skip_prefix(arg, "tree:", &v0)) {
		if (!git_parse_ulong(v0, &filter_options->tree_exclude_depth)) {
			if (errbuf) {
				strbuf_addstr(
					errbuf,
					_("expected 'tree:<depth>'"));
			}
			return 1;
		}
		filter_options->choice = LOFC_TREE_DEPTH;
		return 0;

	} else if (skip_prefix(arg, "sparse:oid=", &v0)) {
		struct object_context oc;
		struct object_id sparse_oid;

		/*
		 * Try to parse <oid-expression> into an OID for the current
		 * command, but DO NOT complain if we don't have the blob or
		 * ref locally.
		 */
		if (!get_oid_with_context(the_repository, v0, GET_OID_BLOB,
					  &sparse_oid, &oc))
			filter_options->sparse_oid_value = oiddup(&sparse_oid);
		filter_options->choice = LOFC_SPARSE_OID;
		return 0;

	} else if (skip_prefix(arg, "sparse:path=", &v0)) {
		filter_options->choice = LOFC_SPARSE_PATH;
		filter_options->sparse_path_value = strdup(v0);
		return 0;
	}
	/*
	 * Please update _git_fetch() in git-completion.bash when you
	 * add new filters
	 */

	if (errbuf)
		strbuf_addf(errbuf, "invalid filter-spec '%s'", arg);

	memset(filter_options, 0, sizeof(*filter_options));
	return 1;
}

int parse_list_objects_filter(struct list_objects_filter_options *filter_options,
			      const char *arg)
{
	struct strbuf buf = STRBUF_INIT;
	if (gently_parse_list_objects_filter(filter_options, arg, &buf))
		die("%s", buf.buf);
	return 0;
}

int opt_parse_list_objects_filter(const struct option *opt,
				  const char *arg, int unset)
{
	struct list_objects_filter_options *filter_options = opt->value;

	if (unset || !arg) {
		list_objects_filter_set_no_filter(filter_options);
		return 0;
	}

	return parse_list_objects_filter(filter_options, arg);
}

void expand_list_objects_filter_spec(
	const struct list_objects_filter_options *filter,
	struct strbuf *expanded_spec)
{
	strbuf_init(expanded_spec, strlen(filter->filter_spec));
	if (filter->choice == LOFC_BLOB_LIMIT)
		strbuf_addf(expanded_spec, "blob:limit=%lu",
			    filter->blob_limit_value);
	else if (filter->choice == LOFC_TREE_DEPTH)
		strbuf_addf(expanded_spec, "tree:%lu",
			    filter->tree_exclude_depth);
	else
		strbuf_addstr(expanded_spec, filter->filter_spec);
}

void list_objects_filter_release(
	struct list_objects_filter_options *filter_options)
{
	free(filter_options->filter_spec);
	free(filter_options->sparse_oid_value);
	free(filter_options->sparse_path_value);
	memset(filter_options, 0, sizeof(*filter_options));
}

void partial_clone_register(
	const char *remote,
	const struct list_objects_filter_options *filter_options)
{
	char *cfg_name;
	char *filter_name;

	/* Check if it is already registered */
	if (!promisor_remote_find(remote)) {
		git_config_set("core.repositoryformatversion", "1");

		/* Add promisor config for the remote */
		cfg_name = xstrfmt("remote.%s.promisor", remote);
		git_config_set(cfg_name, "true");
		free(cfg_name);
	}

	/*
	 * Record the initial filter-spec in the config as
	 * the default for subsequent fetches from this remote.
	 */
	filter_name = xstrfmt("remote.%s.partialclonefilter", remote);
	git_config_set(filter_name, filter_options->filter_spec);
	free(filter_name);

	/* Make sure the config info are reset */
	promisor_remote_reinit();
}

void partial_clone_get_default_filter_spec(
	struct list_objects_filter_options *filter_options,
	const char *remote)
{
	struct promisor_remote *promisor = promisor_remote_find(remote);

	/*
	 * Parse default value, but silently ignore it if it is invalid.
	 */
	if (promisor)
		gently_parse_list_objects_filter(filter_options,
						 promisor->partial_clone_filter,
						 NULL);
}
debug log:

solving 02f48b7c40 ...
found 02f48b7c40 in https://public-inbox.org/git/20190312132959.11764-8-chriscool@tuxfamily.org/ ||
	https://public-inbox.org/git/20190401164045.17328-8-chriscool@tuxfamily.org/ ||
	https://public-inbox.org/git/20190409161116.30256-10-chriscool@tuxfamily.org/
found f41a831fce in https://public-inbox.org/git/20190401164045.17328-7-chriscool@tuxfamily.org/ ||
	https://public-inbox.org/git/20190312132959.11764-7-chriscool@tuxfamily.org/ ||
	https://public-inbox.org/git/20190409161116.30256-8-chriscool@tuxfamily.org/
found c0036f7378 in git.git.git
preparing index
index prepared:
100644 c0036f73789d1a6a3ff88a76c3838241e65ca868	list-objects-filter-options.c

applying [1/6] https://public-inbox.org/git/20190401164045.17328-7-chriscool@tuxfamily.org/
diff --git a/list-objects-filter-options.c b/list-objects-filter-options.c
index c0036f7378..f41a831fce 100644

Checking patch list-objects-filter-options.c...
Applied patch list-objects-filter-options.c cleanly.

skipping https://public-inbox.org/git/20190312132959.11764-7-chriscool@tuxfamily.org/ for f41a831fce
skipping https://public-inbox.org/git/20190409161116.30256-8-chriscool@tuxfamily.org/ for f41a831fce
index at:
100644 f41a831fce6d72711b2e9e9dd18eac4d7d4624b6	list-objects-filter-options.c

applying [2/6] https://public-inbox.org/git/20190312132959.11764-8-chriscool@tuxfamily.org/
diff --git a/list-objects-filter-options.c b/list-objects-filter-options.c
index f41a831fce..02f48b7c40 100644

Checking patch list-objects-filter-options.c...
Applied patch list-objects-filter-options.c cleanly.

skipping https://public-inbox.org/git/20190401164045.17328-8-chriscool@tuxfamily.org/ for 02f48b7c40
skipping https://public-inbox.org/git/20190409161116.30256-10-chriscool@tuxfamily.org/ for 02f48b7c40
index at:
100644 02f48b7c40db8eeeb08df2b54a71019331ae6a82	list-objects-filter-options.c

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