/*      $OpenBSD: fargs.c,v 1.26 2023/11/27 11:30:49 claudio Exp $ */
/*
 * Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <sys/stat.h>

#include <assert.h>
#include <err.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include "extern.h"

#define RSYNC_PATH      "rsync"

const char *
alt_base_mode(int mode)
{
        switch (mode) {
        case BASE_MODE_COMPARE:
                return "--compare-dest";
        case BASE_MODE_COPY:
                return "--copy-dest";
        case BASE_MODE_LINK:
                return "--link-dest";
        default:
                errx(1, "unknown base mode %d", mode);
        }
}

char **
fargs_cmdline(struct sess *sess, const struct fargs *f, size_t *skip)
{
        arglist          args;
        size_t           j;
        char            *rsync_path, *ap, *arg;

        memset(&args, 0, sizeof args);

        assert(f != NULL);
        assert(f->sourcesz > 0);

        if ((rsync_path = sess->opts->rsync_path) == NULL)
                rsync_path = RSYNC_PATH;

        if (f->host != NULL) {
                /*
                 * Splice arguments from -e "foo bar baz" into array
                 * elements required for execve(2).
                 * This doesn't do anything fancy: it splits along
                 * whitespace into the array.
                 */

                if (sess->opts->ssh_prog) {
                        ap = strdup(sess->opts->ssh_prog);
                        if (ap == NULL)
                                err(ERR_NOMEM, NULL);

                        while ((arg = strsep(&ap, " \t")) != NULL) {
                                if (arg[0] == '\0') {
                                        ap++;   /* skip separators */
                                        continue;
                                }

                                addargs(&args, "%s", arg);
                        }
                } else
                        addargs(&args, "ssh");

                addargs(&args, "%s", f->host);
                addargs(&args, "%s", rsync_path);
                if (skip)
                        *skip = args.num;
                addargs(&args, "--server");
                if (f->mode == FARGS_RECEIVER)
                        addargs(&args, "--sender");
        } else {
                addargs(&args, "%s", rsync_path);
                addargs(&args, "--server");
        }

        /* Shared arguments. */

        if (sess->opts->del)
                addargs(&args, "--delete");
        if (sess->opts->numeric_ids)
                addargs(&args, "--numeric-ids");
        if (sess->opts->preserve_gids)
                addargs(&args, "-g");
        if (sess->opts->preserve_links)
                addargs(&args, "-l");
        if (sess->opts->dry_run)
                addargs(&args, "-n");
        if (sess->opts->preserve_uids)
                addargs(&args, "-o");
        if (sess->opts->preserve_perms)
                addargs(&args, "-p");
        if (sess->opts->devices)
                addargs(&args, "-D");
        if (sess->opts->recursive)
                addargs(&args, "-r");
        if (sess->opts->preserve_times)
                addargs(&args, "-t");
        if (sess->opts->ignore_times)
                addargs(&args, "-I");
        if (verbose > 3)
                addargs(&args, "-v");
        if (verbose > 2)
                addargs(&args, "-v");
        if (verbose > 1)
                addargs(&args, "-v");
        if (verbose > 0)
                addargs(&args, "-v");
        if (sess->opts->one_file_system > 1)
                addargs(&args, "-x");
        if (sess->opts->one_file_system > 0)
                addargs(&args, "-x");
        if (sess->opts->specials && !sess->opts->devices)
                addargs(&args, "--specials");
        if (!sess->opts->specials && sess->opts->devices)
                /* --devices is sent as -D --no-specials */
                addargs(&args, "--no-specials");
        if (sess->opts->max_size >= 0)
                addargs(&args, "--max-size=%lld", sess->opts->max_size);
        if (sess->opts->min_size >= 0)
                addargs(&args, "--min-size=%lld", sess->opts->min_size);

        /* extra options for the receiver (local is sender) */
        if (f->mode == FARGS_SENDER) {
                if (sess->opts->ignore_dir_times)
                        addargs(&args, "-O");
                if (sess->opts->ignore_link_times)
                        addargs(&args, "-J");
                if (sess->opts->size_only)
                        addargs(&args, "--size-only");

                /* only add --compare-dest, etc if this is the sender */
                if (sess->opts->alt_base_mode != 0) {
                        for (j = 0; j < MAX_BASEDIR; j++) {
                                if (sess->opts->basedir[j] == NULL)
                                        break;
                                addargs(&args, "%s=%s",
                                    alt_base_mode(sess->opts->alt_base_mode),
                                    sess->opts->basedir[j]);
                        }
                }
        }

        /* Terminate with a full-stop for reasons unknown. */

        addargs(&args, ".");

        if (f->mode == FARGS_RECEIVER) {
                for (j = 0; j < f->sourcesz; j++)
                        addargs(&args, "%s", f->sources[j]);
        } else
                addargs(&args, "%s", f->sink);

        return args.list;
}