Release 3.7.4

[thirdparty/libarchive.git] / tar / write.c

/*-
 * Copyright (c) 2003-2007 Tim Kientzle
 * Copyright (c) 2012 Michihiro NAKAJIMA
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "bsdtar_platform.h"

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_ATTR_XATTR_H
#include <attr/xattr.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#ifdef HAVE_IO_H
#include <io.h>
#endif
#ifdef HAVE_LIBGEN_H
#include <libgen.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include "bsdtar.h"
#include "err.h"
#include "line_reader.h"

#ifndef O_BINARY
#define O_BINARY 0
#endif

struct archive_dir_entry {
        struct archive_dir_entry        *next;
        time_t                   mtime_sec;
        int                      mtime_nsec;
        char                    *name;
};

struct archive_dir {
        struct archive_dir_entry *head, *tail;
};

static int               append_archive(struct bsdtar *, struct archive *,
                             struct archive *ina);
static int               append_archive_filename(struct bsdtar *,
                             struct archive *, const char *fname);
static void              archive_names_from_file(struct bsdtar *bsdtar,
                             struct archive *a);
static int               copy_file_data_block(struct bsdtar *,
                             struct archive *a, struct archive *,
                             struct archive_entry *);
static void              excluded_callback(struct archive *, void *,
                             struct archive_entry *);
static void              report_write(struct bsdtar *, struct archive *,
                             struct archive_entry *, int64_t progress);
static void              test_for_append(struct bsdtar *);
static int               metadata_filter(struct archive *, void *,
                             struct archive_entry *);
static void              write_archive(struct archive *, struct bsdtar *);
static void              write_entry(struct bsdtar *, struct archive *,
                             struct archive_entry *);
static void              write_file(struct bsdtar *, struct archive *,
                             struct archive_entry *);
static void              write_hierarchy(struct bsdtar *, struct archive *,
                             const char *);

#if defined(_WIN32) && !defined(__CYGWIN__)
/* Not a full lseek() emulation, but enough for our needs here. */
static int
seek_file(int fd, int64_t offset, int whence)
{
        LARGE_INTEGER distance;
        (void)whence; /* UNUSED */
        distance.QuadPart = offset;
        return (SetFilePointerEx((HANDLE)_get_osfhandle(fd),
                distance, NULL, FILE_BEGIN) ? 1 : -1);
}
#define open _open
#define close _close
#define read _read
#ifdef lseek
#undef lseek
#endif
#define lseek seek_file
#endif

static void
set_writer_options(struct bsdtar *bsdtar, struct archive *a)
{
        const char *writer_options;
        int r;

        writer_options = getenv(ENV_WRITER_OPTIONS);
        if (writer_options != NULL) {
                size_t module_len = sizeof(IGNORE_WRONG_MODULE_NAME) - 1;
                size_t opt_len = strlen(writer_options) + 1;
                char *p;
                /* Set default write options. */
                if ((p = malloc(module_len + opt_len)) == NULL)
                        lafe_errc(1, errno, "Out of memory");
                /* Prepend magic code to ignore options for
                 * a format or filters which are not added to
                 * the archive write object. */
                memcpy(p, IGNORE_WRONG_MODULE_NAME, module_len);
                memcpy(p, writer_options, opt_len);
                r = archive_write_set_options(a, p);
                free(p);
                if (r < ARCHIVE_WARN)
                        lafe_errc(1, 0, "%s", archive_error_string(a));
                else
                        archive_clear_error(a);
        }
        if (ARCHIVE_OK != archive_write_set_options(a, bsdtar->option_options))
                lafe_errc(1, 0, "%s", archive_error_string(a));
}

static void
set_reader_options(struct bsdtar *bsdtar, struct archive *a)
{
        const char *reader_options;
        int r;

        (void)bsdtar; /* UNUSED */

        reader_options = getenv(ENV_READER_OPTIONS);
        if (reader_options != NULL) {
                size_t module_len = sizeof(IGNORE_WRONG_MODULE_NAME) - 1;
                size_t opt_len = strlen(reader_options) + 1;
                char *p;
                /* Set default write options. */
                if ((p = malloc(module_len + opt_len)) == NULL)
                if (p == NULL)
                        lafe_errc(1, errno, "Out of memory");
                /* Prepend magic code to ignore options for
                 * a format or filters which are not added to
                 * the archive write object. */
                memcpy(p, IGNORE_WRONG_MODULE_NAME, module_len);
                memcpy(p, reader_options, opt_len);
                r = archive_read_set_options(a, p);
                free(p);
                if (r < ARCHIVE_WARN)
                        lafe_errc(1, 0, "%s", archive_error_string(a));
                else
                        archive_clear_error(a);
        }
        if (bsdtar->flags & OPTFLAG_IGNORE_ZEROS)
                if (archive_read_set_options(a,
                    "read_concatenated_archives") != ARCHIVE_OK)
                        lafe_errc(1, 0, "%s", archive_error_string(a));
}

void
tar_mode_c(struct bsdtar *bsdtar)
{
        struct archive *a;
        const void *filter_name;
        int r;

        if (*bsdtar->argv == NULL && bsdtar->names_from_file == NULL)
                lafe_errc(1, 0, "no files or directories specified");

        a = archive_write_new();

        /* Support any format that the library supports. */
        if (cset_get_format(bsdtar->cset) == NULL) {
                r = archive_write_set_format_pax_restricted(a);
                cset_set_format(bsdtar->cset, "pax restricted");
        } else {
                r = archive_write_set_format_by_name(a,
                        cset_get_format(bsdtar->cset));
        }
        if (r != ARCHIVE_OK) {
                fprintf(stderr, "Can't use format %s: %s\n",
                    cset_get_format(bsdtar->cset),
                    archive_error_string(a));
                usage();
        }

        archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block);
        archive_write_set_bytes_in_last_block(a, bsdtar->bytes_in_last_block);

        r = cset_write_add_filters(bsdtar->cset, a, &filter_name);
        if (r < ARCHIVE_WARN) {
                lafe_errc(1, 0, "Unsupported compression option --%s",
                    (const char *)filter_name);
        }

        set_writer_options(bsdtar, a);
        if (bsdtar->passphrase != NULL)
                r = archive_write_set_passphrase(a, bsdtar->passphrase);
        else
                r = archive_write_set_passphrase_callback(a, bsdtar,
                        &passphrase_callback);
        if (r != ARCHIVE_OK)
                lafe_errc(1, 0, "%s", archive_error_string(a));
        if (ARCHIVE_OK != archive_write_open_filename(a, bsdtar->filename))
                lafe_errc(1, 0, "%s", archive_error_string(a));
        write_archive(a, bsdtar);
}

/*
 * Same as 'c', except we only support tar or empty formats in
 * uncompressed files on disk.
 */
void
tar_mode_r(struct bsdtar *bsdtar)
{
        int64_t end_offset;
        int     format;
        struct archive *a;
        struct archive_entry *entry;
        int     r;

        /* Sanity-test some arguments and the file. */
        test_for_append(bsdtar);

        format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;

#if defined(__BORLANDC__)
        bsdtar->fd = open(bsdtar->filename, O_RDWR | O_CREAT | O_BINARY);
#else
        bsdtar->fd = open(bsdtar->filename, O_RDWR | O_CREAT | O_BINARY, 0666);
#endif
        if (bsdtar->fd < 0)
                lafe_errc(1, errno,
                    "Cannot open %s", bsdtar->filename);

        a = archive_read_new();
        archive_read_support_filter_all(a);
        archive_read_support_format_empty(a);
        archive_read_support_format_tar(a);
        archive_read_support_format_gnutar(a);
        set_reader_options(bsdtar, a);
        r = archive_read_open_fd(a, bsdtar->fd, 10240);
        if (r != ARCHIVE_OK)
                lafe_errc(1, archive_errno(a),
                    "Can't read archive %s: %s", bsdtar->filename,
                    archive_error_string(a));
        while (0 == archive_read_next_header(a, &entry)) {
                if (archive_filter_code(a, 0) != ARCHIVE_FILTER_NONE) {
                        archive_read_free(a);
                        close(bsdtar->fd);
                        lafe_errc(1, 0,
                            "Cannot append to compressed archive.");
                }
                /* Keep going until we hit end-of-archive */
                format = archive_format(a);
        }

        end_offset = archive_read_header_position(a);
        archive_read_free(a);

        /* Re-open archive for writing */
        a = archive_write_new();
        /*
         * Set the format to be used for writing.  To allow people to
         * extend empty files, we need to allow them to specify the format,
         * which opens the possibility that they will specify a format that
         * doesn't match the existing format.  Hence, the following bit
         * of arcane ugliness.
         */

        if (cset_get_format(bsdtar->cset) != NULL) {
                /* If the user requested a format, use that, but ... */
                archive_write_set_format_by_name(a,
                    cset_get_format(bsdtar->cset));
                /* ... complain if it's not compatible. */
                format &= ARCHIVE_FORMAT_BASE_MASK;
                if (format != (int)(archive_format(a) & ARCHIVE_FORMAT_BASE_MASK)
                    && format != ARCHIVE_FORMAT_EMPTY) {
                        lafe_errc(1, 0,
                            "Format %s is incompatible with the archive %s.",
                            cset_get_format(bsdtar->cset), bsdtar->filename);
                }
        } else {
                /*
                 * Just preserve the current format, with a little care
                 * for formats that libarchive can't write.
                 */
                if (format == ARCHIVE_FORMAT_EMPTY)
                        format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;
                archive_write_set_format(a, format);
        }
        if (lseek(bsdtar->fd, end_offset, SEEK_SET) < 0)
                lafe_errc(1, errno, "Could not seek to archive end");
        set_writer_options(bsdtar, a);
        if (ARCHIVE_OK != archive_write_open_fd(a, bsdtar->fd))
                lafe_errc(1, 0, "%s", archive_error_string(a));

        write_archive(a, bsdtar); /* XXX check return val XXX */

        close(bsdtar->fd);
        bsdtar->fd = -1;
}

void
tar_mode_u(struct bsdtar *bsdtar)
{
        int64_t                  end_offset;
        struct archive          *a;
        struct archive_entry    *entry;
        int                      format;
        struct archive_dir_entry        *p;
        struct archive_dir       archive_dir;

        bsdtar->archive_dir = &archive_dir;
        memset(&archive_dir, 0, sizeof(archive_dir));

        format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;

        /* Sanity-test some arguments and the file. */
        test_for_append(bsdtar);

        bsdtar->fd = open(bsdtar->filename, O_RDWR | O_BINARY);
        if (bsdtar->fd < 0)
                lafe_errc(1, errno,
                    "Cannot open %s", bsdtar->filename);

        a = archive_read_new();
        archive_read_support_filter_all(a);
        archive_read_support_format_tar(a);
        archive_read_support_format_gnutar(a);
        set_reader_options(bsdtar, a);
        if (archive_read_open_fd(a, bsdtar->fd, bsdtar->bytes_per_block)
            != ARCHIVE_OK) {
                lafe_errc(1, 0,
                    "Can't open %s: %s", bsdtar->filename,
                    archive_error_string(a));
        }

        /* Build a list of all entries and their recorded mod times. */
        while (0 == archive_read_next_header(a, &entry)) {
                if (archive_filter_code(a, 0) != ARCHIVE_FILTER_NONE) {
                        archive_read_free(a);
                        close(bsdtar->fd);
                        lafe_errc(1, 0,
                            "Cannot append to compressed archive.");
                }
                if (archive_match_exclude_entry(bsdtar->matching,
                    ARCHIVE_MATCH_MTIME | ARCHIVE_MATCH_OLDER |
                    ARCHIVE_MATCH_EQUAL, entry) != ARCHIVE_OK)
                        lafe_errc(1, 0, "Error : %s",
                            archive_error_string(bsdtar->matching));
                /* Record the last format determination we see */
                format = archive_format(a);
                /* Keep going until we hit end-of-archive */
        }

        end_offset = archive_read_header_position(a);
        archive_read_free(a);

        /* Re-open archive for writing. */
        a = archive_write_new();
        /*
         * Set format to same one auto-detected above.
         */
        archive_write_set_format(a, format);
        archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block);
        archive_write_set_bytes_in_last_block(a, bsdtar->bytes_in_last_block);

        if (lseek(bsdtar->fd, end_offset, SEEK_SET) < 0)
                lafe_errc(1, errno, "Could not seek to archive end");
        set_writer_options(bsdtar, a);
        if (ARCHIVE_OK != archive_write_open_fd(a, bsdtar->fd))
                lafe_errc(1, 0, "%s", archive_error_string(a));

        write_archive(a, bsdtar);

        close(bsdtar->fd);
        bsdtar->fd = -1;

        while (bsdtar->archive_dir->head != NULL) {
                p = bsdtar->archive_dir->head->next;
                free(bsdtar->archive_dir->head->name);
                free(bsdtar->archive_dir->head);
                bsdtar->archive_dir->head = p;
        }
        bsdtar->archive_dir->tail = NULL;
}


/*
 * Write user-specified files/dirs to opened archive.
 */
static void
write_archive(struct archive *a, struct bsdtar *bsdtar)
{
        const char *arg;
        struct archive_entry *entry, *sparse_entry;

        /* Choose a suitable copy buffer size */
        bsdtar->buff_size = 64 * 1024;
        while (bsdtar->buff_size < (size_t)bsdtar->bytes_per_block)
          bsdtar->buff_size *= 2;
        /* Try to compensate for space we'll lose to alignment. */
        bsdtar->buff_size += 16 * 1024;

        /* Allocate a buffer for file data. */
        if ((bsdtar->buff = malloc(bsdtar->buff_size)) == NULL)
                lafe_errc(1, 0, "cannot allocate memory");

        if ((bsdtar->resolver = archive_entry_linkresolver_new()) == NULL)
                lafe_errc(1, 0, "cannot create link resolver");
        archive_entry_linkresolver_set_strategy(bsdtar->resolver,
            archive_format(a));

        /* Create a read_disk object. */
        if ((bsdtar->diskreader = archive_read_disk_new()) == NULL)
                lafe_errc(1, 0, "Cannot create read_disk object");
        /* Tell the read_disk how handle symlink. */
        switch (bsdtar->symlink_mode) {
        case 'H':
                archive_read_disk_set_symlink_hybrid(bsdtar->diskreader);
                break;
        case 'L':
                archive_read_disk_set_symlink_logical(bsdtar->diskreader);
                break;
        default:
                archive_read_disk_set_symlink_physical(bsdtar->diskreader);
                break;
        }
        /* Register entry filters. */
        archive_read_disk_set_matching(bsdtar->diskreader,
            bsdtar->matching, excluded_callback, bsdtar);
        archive_read_disk_set_metadata_filter_callback(
            bsdtar->diskreader, metadata_filter, bsdtar);
        /* Set the behavior of archive_read_disk. */
        archive_read_disk_set_behavior(bsdtar->diskreader,
            bsdtar->readdisk_flags);
        archive_read_disk_set_standard_lookup(bsdtar->diskreader);

        if (bsdtar->names_from_file != NULL)
                archive_names_from_file(bsdtar, a);

        while (*bsdtar->argv) {
                arg = *bsdtar->argv;
                if (arg[0] == '-' && arg[1] == 'C') {
                        arg += 2;
                        if (*arg == '\0') {
                                bsdtar->argv++;
                                arg = *bsdtar->argv;
                                if (arg == NULL) {
                                        lafe_warnc(0, "%s",
                                            "Missing argument for -C");
                                        bsdtar->return_value = 1;
                                        goto cleanup;
                                }
                                if (*arg == '\0') {
                                        lafe_warnc(0,
                                            "Meaningless argument for -C: ''");
                                        bsdtar->return_value = 1;
                                        goto cleanup;
                                }
                        }
                        set_chdir(bsdtar, arg);
                } else {
                        if (*arg != '/')
                                do_chdir(bsdtar); /* Handle a deferred -C */
                        if (*arg == '@') {
                                if (append_archive_filename(bsdtar, a,
                                    arg + 1) != 0)
                                        break;
                        } else
                                write_hierarchy(bsdtar, a, arg);
                }
                bsdtar->argv++;
        }

        archive_read_disk_set_matching(bsdtar->diskreader, NULL, NULL, NULL);
        archive_read_disk_set_metadata_filter_callback(
            bsdtar->diskreader, NULL, NULL);
        entry = NULL;
        archive_entry_linkify(bsdtar->resolver, &entry, &sparse_entry);
        while (entry != NULL) {
                int r;
                struct archive_entry *entry2;
                struct archive *disk = bsdtar->diskreader;

                /*
                 * This tricky code here is to correctly read the contents
                 * of the entry because the disk reader bsdtar->diskreader
                 * is pointing at does not have any information about the
                 * entry by this time and using archive_read_data_block()
                 * with the disk reader consequently must fail. And we
                 * have to re-open the entry to read the contents.
                 */
                /* TODO: Work with -C option as well. */
                r = archive_read_disk_open(disk,
                        archive_entry_sourcepath(entry));
                if (r != ARCHIVE_OK) {
                        lafe_warnc(archive_errno(disk),
                            "%s", archive_error_string(disk));
                        bsdtar->return_value = 1;
                        goto next_entry;
                }

                /*
                 * Invoke archive_read_next_header2() to work
                 * archive_read_data_block(), which is called via write_file(),
                 * without failure.
                 */
                entry2 = archive_entry_new();
                r = archive_read_next_header2(disk, entry2);
                archive_entry_free(entry2);
                if (r != ARCHIVE_OK) {
                        lafe_warnc(archive_errno(disk),
                            "%s", archive_error_string(disk));
                        if (r == ARCHIVE_FATAL)
                                bsdtar->return_value = 1;
                        archive_read_close(disk);
                        goto next_entry;
                }

                write_file(bsdtar, a, entry);
                archive_read_close(disk);
next_entry:
                archive_entry_free(entry);
                entry = NULL;
                archive_entry_linkify(bsdtar->resolver, &entry, &sparse_entry);
        }

        if (archive_write_close(a)) {
                lafe_warnc(0, "%s", archive_error_string(a));
                bsdtar->return_value = 1;
        }

cleanup:
        /* Free file data buffer. */
        free(bsdtar->buff);
        archive_entry_linkresolver_free(bsdtar->resolver);
        bsdtar->resolver = NULL;
        archive_read_free(bsdtar->diskreader);
        bsdtar->diskreader = NULL;

        if (bsdtar->flags & OPTFLAG_TOTALS) {
                fprintf(stderr, "Total bytes written: %s\n",
                    tar_i64toa(archive_filter_bytes(a, -1)));
        }

        archive_write_free(a);
}

/*
 * Archive names specified in file.
 *
 * Unless --null was specified, a line containing exactly "-C" will
 * cause the next line to be a directory to pass to chdir().  If
 * --null is specified, then a line "-C" is just another filename.
 */
static void
archive_names_from_file(struct bsdtar *bsdtar, struct archive *a)
{
        struct lafe_line_reader *lr;
        const char *line;

        bsdtar->next_line_is_dir = 0;

        lr = lafe_line_reader(bsdtar->names_from_file,
            (bsdtar->flags & OPTFLAG_NULL));
        while ((line = lafe_line_reader_next(lr)) != NULL) {
                if (bsdtar->next_line_is_dir) {
                        if (*line != '\0')
                                set_chdir(bsdtar, line);
                        else {
                                lafe_warnc(0,
                                    "Meaningless argument for -C: ''");
                                bsdtar->return_value = 1;
                        }
                        bsdtar->next_line_is_dir = 0;
                } else if (((bsdtar->flags & OPTFLAG_NULL) == 0) &&
                    strcmp(line, "-C") == 0)
                        bsdtar->next_line_is_dir = 1;
                else {
                        if (*line != '/')
                                do_chdir(bsdtar); /* Handle a deferred -C */
                        write_hierarchy(bsdtar, a, line);
                }
        }
        lafe_line_reader_free(lr);
        if (bsdtar->next_line_is_dir)
                lafe_errc(1, errno,
                    "Unexpected end of filename list; "
                    "directory expected after -C");
}

/*
 * Copy from specified archive to current archive.  Returns non-zero
 * for write errors (which force us to terminate the entire archiving
 * operation).  If there are errors reading the input archive, we set
 * bsdtar->return_value but return zero, so the overall archiving
 * operation will complete and return non-zero.
 */
static int
append_archive_filename(struct bsdtar *bsdtar, struct archive *a,
    const char *raw_filename)
{
        struct archive *ina;
        const char *filename = raw_filename;
        int rc;

        if (strcmp(filename, "-") == 0)
                filename = NULL; /* Library uses NULL for stdio. */

        ina = archive_read_new();
        archive_read_support_format_all(ina);
        archive_read_support_filter_all(ina);
        set_reader_options(bsdtar, ina);
        archive_read_set_options(ina, "mtree:checkfs");
        if (bsdtar->passphrase != NULL)
                rc = archive_read_add_passphrase(a, bsdtar->passphrase);
        else
                rc = archive_read_set_passphrase_callback(ina, bsdtar,
                        &passphrase_callback);
        if (rc != ARCHIVE_OK)
                lafe_errc(1, 0, "%s", archive_error_string(a));
        if (archive_read_open_filename(ina, filename,
                                        bsdtar->bytes_per_block)) {
                lafe_warnc(0, "%s", archive_error_string(ina));
                bsdtar->return_value = 1;
                return (0);
        }

        rc = append_archive(bsdtar, a, ina);

        if (rc != ARCHIVE_OK) {
                lafe_warnc(0, "Error reading archive %s: %s",
                    raw_filename, archive_error_string(ina));
                bsdtar->return_value = 1;
        }
        archive_read_free(ina);

        return (rc);
}

static int
append_archive(struct bsdtar *bsdtar, struct archive *a, struct archive *ina)
{
        struct archive_entry *in_entry;
        int e;

        while (ARCHIVE_OK == (e = archive_read_next_header(ina, &in_entry))) {
                if (archive_match_excluded(bsdtar->matching, in_entry))
                        continue;
                if(edit_pathname(bsdtar, in_entry))
                        continue;
                if ((bsdtar->flags & OPTFLAG_INTERACTIVE) &&
                    !yes("copy '%s'", archive_entry_pathname(in_entry)))
                        continue;
                if (bsdtar->verbose > 1) {
                        safe_fprintf(stderr, "a ");
                        list_item_verbose(bsdtar, stderr, in_entry);
                } else if (bsdtar->verbose > 0)
                        safe_fprintf(stderr, "a %s",
                            archive_entry_pathname(in_entry));
                if (need_report())
                        report_write(bsdtar, a, in_entry, 0);

                e = archive_write_header(a, in_entry);
                if (e != ARCHIVE_OK) {
                        if (!bsdtar->verbose)
                                lafe_warnc(0, "%s: %s",
                                    archive_entry_pathname(in_entry),
                                    archive_error_string(a));
                        else
                                fprintf(stderr, ": %s", archive_error_string(a));
                }
                if (e == ARCHIVE_FATAL)
                        exit(1);

                if (e >= ARCHIVE_WARN) {
                        if (archive_entry_size(in_entry) == 0)
                                archive_read_data_skip(ina);
                        else if (copy_file_data_block(bsdtar, a, ina, in_entry))
                                exit(1);
                }

                if (bsdtar->verbose)
                        fprintf(stderr, "\n");
        }

        return (e == ARCHIVE_EOF ? ARCHIVE_OK : e);
}

/* Helper function to copy file to archive. */
static int
copy_file_data_block(struct bsdtar *bsdtar, struct archive *a,
    struct archive *in_a, struct archive_entry *entry)
{
        size_t  bytes_read;
        ssize_t bytes_written;
        int64_t offset, progress = 0;
        char *null_buff = NULL;
        const void *buff;
        int r;

        while ((r = archive_read_data_block(in_a, &buff,
            &bytes_read, &offset)) == ARCHIVE_OK) {
                if (need_report())
                        report_write(bsdtar, a, entry, progress);

                if (offset > progress) {
                        int64_t sparse = offset - progress;
                        size_t ns;

                        if (null_buff == NULL) {
                                null_buff = bsdtar->buff;
                                memset(null_buff, 0, bsdtar->buff_size);
                        }

                        while (sparse > 0) {
                                if (sparse > (int64_t)bsdtar->buff_size)
                                        ns = bsdtar->buff_size;
                                else
                                        ns = (size_t)sparse;
                                bytes_written =
                                    archive_write_data(a, null_buff, ns);
                                if (bytes_written < 0) {
                                        /* Write failed; this is bad */
                                        lafe_warnc(0, "%s",
                                             archive_error_string(a));
                                        return (-1);
                                }
                                if ((size_t)bytes_written < ns) {
                                        /* Write was truncated; warn but
                                         * continue. */
                                        lafe_warnc(0,
                                            "%s: Truncated write; file may "
                                            "have grown while being archived.",
                                            archive_entry_pathname(entry));
                                        return (0);
                                }
                                progress += bytes_written;
                                sparse -= bytes_written;
                        }
                }

                bytes_written = archive_write_data(a, buff, bytes_read);
                if (bytes_written < 0) {
                        /* Write failed; this is bad */
                        lafe_warnc(0, "%s", archive_error_string(a));
                        return (-1);
                }
                if ((size_t)bytes_written < bytes_read) {
                        /* Write was truncated; warn but continue. */
                        lafe_warnc(0,
                            "%s: Truncated write; file may have grown "
                            "while being archived.",
                            archive_entry_pathname(entry));
                        return (0);
                }
                progress += bytes_written;
        }
        if (r < ARCHIVE_WARN) {
                lafe_warnc(archive_errno(a), "%s", archive_error_string(a));
                return (-1);
        }
        return (0);
}

static void
excluded_callback(struct archive *a, void *_data, struct archive_entry *entry)
{
        struct bsdtar *bsdtar = (struct bsdtar *)_data;

        if (bsdtar->flags & OPTFLAG_NO_SUBDIRS)
                return;
        if (!archive_read_disk_can_descend(a))
                return;
        if ((bsdtar->flags & OPTFLAG_INTERACTIVE) &&
            !yes("add '%s'", archive_entry_pathname(entry)))
                return;
        archive_read_disk_descend(a);
}

static int
metadata_filter(struct archive *a, void *_data, struct archive_entry *entry)
{
        struct bsdtar *bsdtar = (struct bsdtar *)_data;

        /* XXX TODO: check whether this filesystem is
         * synthetic and/or local.  Add a new
         * --local-only option to skip non-local
         * filesystems.  Skip synthetic filesystems
         * regardless.
         *
         * The results should be cached, since
         * tree.c doesn't usually visit a directory
         * and the directory contents together.  A simple
         * move-to-front list should perform quite well.
         *
         * Use archive_read_disk_current_filesystem_is_remote().
         */

        /*
         * If the user vetoes this file/directory, skip it.
         * We want this to be fairly late; if some other
         * check would veto this file, we shouldn't bother
         * the user with it.
         */
        if ((bsdtar->flags & OPTFLAG_INTERACTIVE) &&
            !yes("add '%s'", archive_entry_pathname(entry)))
                return (0);

        /* Note: if user vetoes, we won't descend. */
        if (((bsdtar->flags & OPTFLAG_NO_SUBDIRS) == 0) &&
            archive_read_disk_can_descend(a))
                archive_read_disk_descend(a);

        return (1);
}

/*
 * Add the file or dir hierarchy named by 'path' to the archive
 */
static void
write_hierarchy(struct bsdtar *bsdtar, struct archive *a, const char *path)
{
        struct archive *disk = bsdtar->diskreader;
        struct archive_entry *entry = NULL, *spare_entry = NULL;
        int r;

        r = archive_read_disk_open(disk, path);
        if (r != ARCHIVE_OK) {
                lafe_warnc(archive_errno(disk),
                    "%s", archive_error_string(disk));
                bsdtar->return_value = 1;
                return;
        }
        bsdtar->first_fs = -1;

        for (;;) {
                archive_entry_free(entry);
                entry = archive_entry_new();
                r = archive_read_next_header2(disk, entry);
                if (r == ARCHIVE_EOF)
                        break;
                else if (r != ARCHIVE_OK) {
                        lafe_warnc(archive_errno(disk),
                            "%s", archive_error_string(disk));
                        if (r == ARCHIVE_FATAL || r == ARCHIVE_FAILED) {
                                bsdtar->return_value = 1;
                                archive_entry_free(entry);
                                archive_read_close(disk);
                                return;
                        } else if (r < ARCHIVE_WARN)
                                continue;
                }

                if (bsdtar->uid >= 0) {
                        archive_entry_set_uid(entry, bsdtar->uid);
                        if (!bsdtar->uname)
                                archive_entry_set_uname(entry,
                                    archive_read_disk_uname(bsdtar->diskreader,
                                        bsdtar->uid));
                }
                if (bsdtar->gid >= 0) {
                        archive_entry_set_gid(entry, bsdtar->gid);
                        if (!bsdtar->gname)
                                archive_entry_set_gname(entry,
                                    archive_read_disk_gname(bsdtar->diskreader,
                                        bsdtar->gid));
                }
                if (bsdtar->uname)
                        archive_entry_set_uname(entry, bsdtar->uname);
                if (bsdtar->gname)
                        archive_entry_set_gname(entry, bsdtar->gname);

                /*
                 * Rewrite the pathname to be archived.  If rewrite
                 * fails, skip the entry.
                 */
                if (edit_pathname(bsdtar, entry))
                        continue;

                /* Display entry as we process it. */
                if (bsdtar->verbose > 1) {
                        safe_fprintf(stderr, "a ");
                        list_item_verbose(bsdtar, stderr, entry);
                } else if (bsdtar->verbose > 0) {
                /* This format is required by SUSv2. */
                        safe_fprintf(stderr, "a %s",
                            archive_entry_pathname(entry));
                }

                /* Non-regular files get archived with zero size. */
                if (archive_entry_filetype(entry) != AE_IFREG)
                        archive_entry_set_size(entry, 0);

                archive_entry_linkify(bsdtar->resolver, &entry, &spare_entry);

                while (entry != NULL) {
                        write_file(bsdtar, a, entry);
                        archive_entry_free(entry);
                        entry = spare_entry;
                        spare_entry = NULL;
                }

                if (bsdtar->verbose)
                        fprintf(stderr, "\n");
        }
        archive_entry_free(entry);
        archive_read_close(disk);
}

/*
 * Write a single file (or directory or other filesystem object) to
 * the archive.
 */
static void
write_file(struct bsdtar *bsdtar, struct archive *a,
    struct archive_entry *entry)
{
        write_entry(bsdtar, a, entry);
}

/*
 * Write a single entry to the archive.
 */
static void
write_entry(struct bsdtar *bsdtar, struct archive *a,
    struct archive_entry *entry)
{
        int e;

        e = archive_write_header(a, entry);
        if (e != ARCHIVE_OK) {
                if (bsdtar->verbose > 1) {
                        safe_fprintf(stderr, "a ");
                        list_item_verbose(bsdtar, stderr, entry);
                        lafe_warnc(0, ": %s", archive_error_string(a));
                } else if (bsdtar->verbose > 0) {
                        lafe_warnc(0, "%s: %s",
                            archive_entry_pathname(entry),
                            archive_error_string(a));
                } else
                        fprintf(stderr, ": %s", archive_error_string(a));
        }

        if (e == ARCHIVE_FATAL)
                exit(1);

        /*
         * If we opened a file earlier, write it out now.  Note that
         * the format handler might have reset the size field to zero
         * to inform us that the archive body won't get stored.  In
         * that case, just skip the write.
         */
        if (e >= ARCHIVE_WARN && archive_entry_size(entry) > 0) {
                if (copy_file_data_block(bsdtar, a, bsdtar->diskreader, entry))
                        exit(1);
        }
}

static void
report_write(struct bsdtar *bsdtar, struct archive *a,
    struct archive_entry *entry, int64_t progress)
{
        uint64_t comp, uncomp;
        int compression;

        if (bsdtar->verbose)
                fprintf(stderr, "\n");
        comp = archive_filter_bytes(a, -1);
        uncomp = archive_filter_bytes(a, 0);
        fprintf(stderr, "In: %d files, %s bytes;",
            archive_file_count(a), tar_i64toa(uncomp));
        if (comp >= uncomp)
                compression = 0;
        else
                compression = (int)((uncomp - comp) * 100 / uncomp);
        fprintf(stderr,
            " Out: %s bytes, compression %d%%\n",
            tar_i64toa(comp), compression);
        /* Can't have two calls to tar_i64toa() pending, so split the output. */
        safe_fprintf(stderr, "Current: %s (%s",
            archive_entry_pathname(entry),
            tar_i64toa(progress));
        fprintf(stderr, "/%s bytes)\n",
            tar_i64toa(archive_entry_size(entry)));
}

static void
test_for_append(struct bsdtar *bsdtar)
{
        struct stat s;

        if (*bsdtar->argv == NULL && bsdtar->names_from_file == NULL)
                lafe_errc(1, 0, "no files or directories specified");
        if (bsdtar->filename == NULL)
                lafe_errc(1, 0, "Cannot append to stdout.");

        if (stat(bsdtar->filename, &s) != 0)
                return;

        if (!S_ISREG(s.st_mode) && !S_ISBLK(s.st_mode))
                lafe_errc(1, 0,
                    "Cannot append to %s: not a regular file.",
                    bsdtar->filename);

/* Is this an appropriate check here on Windows? */
/*
        if (GetFileType(handle) != FILE_TYPE_DISK)
                lafe_errc(1, 0, "Cannot append");
*/

}