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#include "cache.h"
#include "dir.h"
#include "ll-merge.h"
#include "merge-strategies.h"
#include "xdiff-interface.h"

static int add_to_index_cacheinfo(struct index_state *istate,
				  unsigned int mode,
				  const struct object_id *oid, const char *path)
{
	struct cache_entry *ce;
	int len, option;

	if (!verify_path(path, mode))
		return error(_("Invalid path '%s'"), path);

	len = strlen(path);
	ce = make_empty_cache_entry(istate, len);

	oidcpy(&ce->oid, oid);
	memcpy(ce->name, path, len);
	ce->ce_flags = create_ce_flags(0);
	ce->ce_namelen = len;
	ce->ce_mode = create_ce_mode(mode);
	if (assume_unchanged)
		ce->ce_flags |= CE_VALID;
	option = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE;
	if (add_index_entry(istate, ce, option))
		return error(_("%s: cannot add to the index"), path);

	return 0;
}

static int checkout_from_index(struct index_state *istate, const char *path)
{
	struct checkout state = CHECKOUT_INIT;
	struct cache_entry *ce;

	state.istate = istate;
	state.force = 1;
	state.base_dir = "";
	state.base_dir_len = 0;

	ce = index_file_exists(istate, path, strlen(path), 0);
	if (checkout_entry(ce, &state, NULL, NULL) < 0)
		return error(_("%s: cannot checkout file"), path);
	return 0;
}

static int merge_one_file_deleted(struct index_state *istate,
				  const struct object_id *orig_blob,
				  const struct object_id *our_blob,
				  const struct object_id *their_blob, const char *path,
				  unsigned int orig_mode, unsigned int our_mode, unsigned int their_mode)
{
	if ((our_blob && orig_mode != our_mode) ||
	    (their_blob && orig_mode != their_mode))
		return error(_("File %s deleted on one branch but had its "
			       "permissions changed on the other."), path);

	if (our_blob) {
		printf(_("Removing %s\n"), path);

		if (file_exists(path))
			remove_path(path);
	}

	if (remove_file_from_index(istate, path))
		return error("%s: cannot remove from the index", path);
	return 0;
}

static int do_merge_one_file(struct index_state *istate,
			     const struct object_id *orig_blob,
			     const struct object_id *our_blob,
			     const struct object_id *their_blob, const char *path,
			     unsigned int orig_mode, unsigned int our_mode, unsigned int their_mode)
{
	int ret, i, dest;
	mmbuffer_t result = {NULL, 0};
	mmfile_t mmfs[3];
	struct ll_merge_options merge_opts = {0};
	struct cache_entry *ce;

	if (our_mode == S_IFLNK || their_mode == S_IFLNK)
		return error(_("%s: Not merging symbolic link changes."), path);
	else if (our_mode == S_IFGITLINK || their_mode == S_IFGITLINK)
		return error(_("%s: Not merging conflicting submodule changes."), path);

	read_mmblob(mmfs + 1, our_blob);
	read_mmblob(mmfs + 2, their_blob);

	if (orig_blob) {
		printf(_("Auto-merging %s\n"), path);
		read_mmblob(mmfs + 0, orig_blob);
	} else {
		printf(_("Added %s in both, but differently.\n"), path);
		read_mmblob(mmfs + 0, &null_oid);
	}

	merge_opts.xdl_opts = XDL_MERGE_ZEALOUS_ALNUM;
	ret = ll_merge(&result, path,
		       mmfs + 0, "orig",
		       mmfs + 1, "our",
		       mmfs + 2, "their",
		       istate, &merge_opts);

	for (i = 0; i < 3; i++)
		free(mmfs[i].ptr);

	if (ret > 127 || !orig_blob)
		ret = error(_("content conflict in %s"), path);

	/* Create the working tree file, using "our tree" version from
	   the index, and then store the result of the merge. */
	ce = index_file_exists(istate, path, strlen(path), 0);
	if (!ce)
		BUG("file is not present in the cache?");

	unlink(path);
	dest = open(path, O_WRONLY | O_CREAT, ce->ce_mode);
	write_in_full(dest, result.ptr, result.size);
	close(dest);

	free(result.ptr);

	if (ret && our_mode != their_mode)
		return error(_("permission conflict: %o->%o,%o in %s"),
			     orig_mode, our_mode, their_mode, path);
	if (ret)
		return 1;

	return add_file_to_index(istate, path, 0);
}

int merge_strategies_one_file(struct repository *r,
			      const struct object_id *orig_blob,
			      const struct object_id *our_blob,
			      const struct object_id *their_blob, const char *path,
			      unsigned int orig_mode, unsigned int our_mode,
			      unsigned int their_mode)
{
	if (orig_blob &&
	    ((!their_blob && our_blob && oideq(orig_blob, our_blob)) ||
	     (!our_blob && their_blob && oideq(orig_blob, their_blob))))
		/* Deleted in both or deleted in one and unchanged in
		   the other */
		return merge_one_file_deleted(r->index,
					      orig_blob, our_blob, their_blob, path,
					      orig_mode, our_mode, their_mode);
	else if (!orig_blob && our_blob && !their_blob) {
		/* Added in one.  The other side did not add and we
		   added so there is nothing to be done, except making
		   the path merged. */
		return add_to_index_cacheinfo(r->index, our_mode, our_blob, path);
	} else if (!orig_blob && !our_blob && their_blob) {
		printf(_("Adding %s\n"), path);

		if (file_exists(path))
			return error(_("untracked %s is overwritten by the merge."), path);

		if (add_to_index_cacheinfo(r->index, their_mode, their_blob, path))
			return 1;
		return checkout_from_index(r->index, path);
	} else if (!orig_blob && our_blob && their_blob &&
		   oideq(our_blob, their_blob)) {
		/* Added in both, identically (check for same
		   permissions). */
		if (our_mode != their_mode)
			return error(_("File %s added identically in both branches, "
				       "but permissions conflict %o->%o."),
				     path, our_mode, their_mode);

		printf(_("Adding %s\n"), path);

		if (add_to_index_cacheinfo(r->index, our_mode, our_blob, path))
			return 1;
		return checkout_from_index(r->index, path);
	} else if (our_blob && their_blob)
		/* Modified in both, but differently. */
		return do_merge_one_file(r->index,
					 orig_blob, our_blob, their_blob, path,
					 orig_mode, our_mode, their_mode);
	else {
		char *orig_hex = "", *our_hex = "", *their_hex = "";

		if (orig_blob)
			orig_hex = oid_to_hex(orig_blob);
		if (our_blob)
			our_hex = oid_to_hex(our_blob);
		if (their_blob)
			their_hex = oid_to_hex(their_blob);

		return error(_("%s: Not handling case %s -> %s -> %s"),
			     path, orig_hex, our_hex, their_hex);
	}

	return 0;
}
debug log:

solving f2af4a894d ...
found f2af4a894d in https://public-inbox.org/git/20200901105705.6059-3-alban.gruin@gmail.com/

applying [1/1] https://public-inbox.org/git/20200901105705.6059-3-alban.gruin@gmail.com/
diff --git a/merge-strategies.c b/merge-strategies.c
new file mode 100644
index 0000000000..f2af4a894d

Checking patch merge-strategies.c...
Applied patch merge-strategies.c cleanly.

index at:
100644 f2af4a894d850ff769aceb4a9d4dbcdc67fc47d3	merge-strategies.c

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