diff options
Diffstat (limited to 'tar/write.c')
| -rw-r--r-- | tar/write.c | 1155 |
1 files changed, 1155 insertions, 0 deletions
diff --git a/tar/write.c b/tar/write.c new file mode 100644 index 0000000..6aeb47c --- /dev/null +++ b/tar/write.c @@ -0,0 +1,1155 @@ +/*- + * Copyright (c) 2003-2007 Tim Kientzle + * 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" +__FBSDID("$FreeBSD: src/usr.bin/tar/write.c,v 1.79 2008/11/27 05:49:52 kientzle Exp $"); + +#ifdef HAVE_SYS_TYPES_H +#include <sys/types.h> +#endif +#ifdef HAVE_SYS_IOCTL_H +#include <sys/ioctl.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_LIMITS_H +#include <limits.h> +#endif +#ifdef HAVE_LINUX_FS_H +#include <linux/fs.h> /* for Linux file flags */ +#endif +/* + * Some Linux distributions have both linux/ext2_fs.h and ext2fs/ext2_fs.h. + * As the include guards don't agree, the order of include is important. + */ +#ifdef HAVE_LINUX_EXT2_FS_H +#include <linux/ext2_fs.h> /* for Linux file flags */ +#endif +#if defined(HAVE_EXT2FS_EXT2_FS_H) && !defined(__CYGWIN__) +/* This header exists but is broken on Cygwin. */ +#include <ext2fs/ext2_fs.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" +#include "tree.h" + +/* Size of buffer for holding file data prior to writing. */ +#define FILEDATABUFLEN 65536 + +/* Fixed size of uname/gname caches. */ +#define name_cache_size 101 + +#ifndef O_BINARY +#define O_BINARY 0 +#endif + +static const char * const NO_NAME = "(noname)"; + +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; +}; + +struct name_cache { + int probes; + int hits; + size_t size; + struct { + id_t id; + const char *name; + } cache[name_cache_size]; +}; + +static void add_dir_list(struct bsdtar *bsdtar, const char *path, + time_t mtime_sec, int mtime_nsec); +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(struct bsdtar *, struct archive *a, + struct archive *ina, struct archive_entry *); +static int new_enough(struct bsdtar *, const char *path, + const struct stat *); +static void report_write(struct bsdtar *, struct archive *, + struct archive_entry *, int64_t progress); +static void test_for_append(struct bsdtar *); +static void write_archive(struct archive *, struct bsdtar *); +static void write_entry_backend(struct bsdtar *, struct archive *, + struct archive_entry *); +static int write_file_data(struct bsdtar *, struct archive *, + struct archive_entry *, int fd); +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 +#define lseek seek_file +#endif + +void +tar_mode_c(struct bsdtar *bsdtar) +{ + struct archive *a; + 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 (bsdtar->create_format == NULL) { + r = archive_write_set_format_pax_restricted(a); + bsdtar->create_format = "pax restricted"; + } else { + r = archive_write_set_format_by_name(a, bsdtar->create_format); + } + if (r != ARCHIVE_OK) { + fprintf(stderr, "Can't use format %s: %s\n", + bsdtar->create_format, + archive_error_string(a)); + usage(); + } + + /* + * If user explicitly set the block size, then assume they + * want the last block padded as well. Otherwise, use the + * default block size and accept archive_write_open_file()'s + * default padding decisions. + */ + if (bsdtar->bytes_per_block != 0) { + archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block); + archive_write_set_bytes_in_last_block(a, + bsdtar->bytes_per_block); + } else + archive_write_set_bytes_per_block(a, DEFAULT_BYTES_PER_BLOCK); + + if (bsdtar->compress_program) { + archive_write_set_compression_program(a, bsdtar->compress_program); + } else { + switch (bsdtar->create_compression) { + case 0: + r = archive_write_set_compression_none(a); + break; + case 'j': case 'y': + r = archive_write_set_compression_bzip2(a); + break; + case 'J': + r = archive_write_set_compression_xz(a); + break; + case OPTION_LZMA: + r = archive_write_set_compression_lzma(a); + break; + case 'z': + r = archive_write_set_compression_gzip(a); + break; + case 'Z': + r = archive_write_set_compression_compress(a); + break; + default: + lafe_errc(1, 0, + "Unrecognized compression option -%c", + bsdtar->create_compression); + } + if (r != ARCHIVE_OK) { + lafe_errc(1, 0, + "Unsupported compression option -%c", + bsdtar->create_compression); + } + } + + if (ARCHIVE_OK != archive_write_set_options(a, bsdtar->option_options)) + lafe_errc(1, 0, "%s", archive_error_string(a)); + if (ARCHIVE_OK != archive_write_open_file(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_compression_all(a); + archive_read_support_format_tar(a); + archive_read_support_format_gnutar(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_compression(a) != ARCHIVE_COMPRESSION_NONE) { + archive_read_finish(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_finish(a); + + /* Re-open archive for writing */ + a = archive_write_new(); + archive_write_set_compression_none(a); + /* + * 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 (bsdtar->create_format != NULL) { + /* If the user requested a format, use that, but ... */ + archive_write_set_format_by_name(a, + bsdtar->create_format); + /* ... 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.", + bsdtar->create_format, bsdtar->filename); + } + } else { + /* + * Just preserve the current format, with a little care + * for formats that libarchive can't write. + */ + if (format == ARCHIVE_FORMAT_TAR_GNUTAR) + /* TODO: When gtar supports pax, use pax restricted. */ + format = ARCHIVE_FORMAT_TAR_USTAR; + 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"); + if (ARCHIVE_OK != archive_write_set_options(a, bsdtar->option_options)) + lafe_errc(1, 0, "%s", archive_error_string(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_compression_all(a); + archive_read_support_format_tar(a); + archive_read_support_format_gnutar(a); + if (archive_read_open_fd(a, bsdtar->fd, + bsdtar->bytes_per_block != 0 ? bsdtar->bytes_per_block : + DEFAULT_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_compression(a) != ARCHIVE_COMPRESSION_NONE) { + archive_read_finish(a); + close(bsdtar->fd); + lafe_errc(1, 0, + "Cannot append to compressed archive."); + } + add_dir_list(bsdtar, archive_entry_pathname(entry), + archive_entry_mtime(entry), + archive_entry_mtime_nsec(entry)); + /* 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_finish(a); + + /* Re-open archive for writing. */ + a = archive_write_new(); + archive_write_set_compression_none(a); + /* + * Set format to same one auto-detected above, except that + * we don't write GNU tar format, so use ustar instead. + */ + if (format == ARCHIVE_FORMAT_TAR_GNUTAR) + format = ARCHIVE_FORMAT_TAR_USTAR; + archive_write_set_format(a, format); + if (bsdtar->bytes_per_block != 0) { + archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block); + archive_write_set_bytes_in_last_block(a, + bsdtar->bytes_per_block); + } else + archive_write_set_bytes_per_block(a, DEFAULT_BYTES_PER_BLOCK); + if (lseek(bsdtar->fd, end_offset, SEEK_SET) < 0) + lafe_errc(1, errno, "Could not seek to archive end"); + if (ARCHIVE_OK != archive_write_set_options(a, bsdtar->option_options)) + lafe_errc(1, 0, "%s", archive_error_string(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; + + /* Allocate a buffer for file data. */ + if ((bsdtar->buff = malloc(FILEDATABUFLEN)) == 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)); + if ((bsdtar->diskreader = archive_read_disk_new()) == NULL) + lafe_errc(1, 0, "Cannot create read_disk object"); + 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; + } + } + set_chdir(bsdtar, arg); + } else { + if (*arg != '/' && (arg[0] != '@' || arg[1] != '/')) + 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++; + } + + entry = NULL; + archive_entry_linkify(bsdtar->resolver, &entry, &sparse_entry); + while (entry != NULL) { + write_entry_backend(bsdtar, a, 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_finish(bsdtar->diskreader); + bsdtar->diskreader = NULL; + + if (bsdtar->option_totals) { + fprintf(stderr, "Total bytes written: %s\n", + tar_i64toa(archive_position_compressed(a))); + } + + archive_write_finish(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->option_null); + while ((line = lafe_line_reader_next(lr)) != NULL) { + if (bsdtar->next_line_is_dir) { + set_chdir(bsdtar, line); + bsdtar->next_line_is_dir = 0; + } else if (!bsdtar->option_null && 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 *filename) +{ + struct archive *ina; + 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_compression_all(ina); + if (archive_read_open_file(ina, filename, 10240)) { + 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", + filename, archive_error_string(ina)); + bsdtar->return_value = 1; + } + archive_read_finish(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 (!new_enough(bsdtar, archive_entry_pathname(in_entry), + archive_entry_stat(in_entry))) + continue; + if (lafe_excluded(bsdtar->matching, archive_entry_pathname(in_entry))) + continue; + if (bsdtar->option_interactive && + !yes("copy '%s'", archive_entry_pathname(in_entry))) + continue; + if (bsdtar->verbose) + 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(bsdtar, a, ina, in_entry)) + exit(1); + } + + if (bsdtar->verbose) + fprintf(stderr, "\n"); + } + + return (e == ARCHIVE_EOF ? ARCHIVE_OK : e); +} + +/* Helper function to copy data between archives. */ +static int +copy_file_data(struct bsdtar *bsdtar, struct archive *a, + struct archive *ina, struct archive_entry *entry) +{ + ssize_t bytes_read; + ssize_t bytes_written; + int64_t progress = 0; + + bytes_read = archive_read_data(ina, bsdtar->buff, FILEDATABUFLEN); + while (bytes_read > 0) { + if (need_report()) + report_write(bsdtar, a, entry, progress); + + bytes_written = archive_write_data(a, bsdtar->buff, + bytes_read); + if (bytes_written < bytes_read) { + lafe_warnc(0, "%s", archive_error_string(a)); + return (-1); + } + progress += bytes_written; + bytes_read = archive_read_data(ina, bsdtar->buff, + FILEDATABUFLEN); + } + + return (0); +} + +/* + * 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_entry *entry = NULL, *spare_entry = NULL; + struct tree *tree; + char symlink_mode = bsdtar->symlink_mode; + dev_t first_dev = 0; + int dev_recorded = 0; + int tree_ret; + + tree = tree_open(path); + + if (!tree) { + lafe_warnc(errno, "%s: Cannot open", path); + bsdtar->return_value = 1; + return; + } + + while ((tree_ret = tree_next(tree)) != 0) { + int r; + const char *name = tree_current_path(tree); + const struct stat *st = NULL; /* info to use for this entry */ + const struct stat *lst = NULL; /* lstat() information */ + int descend; + + if (tree_ret == TREE_ERROR_FATAL) + lafe_errc(1, tree_errno(tree), + "%s: Unable to continue traversing directory tree", + name); + if (tree_ret == TREE_ERROR_DIR) { + lafe_warnc(errno, + "%s: Couldn't visit directory", name); + bsdtar->return_value = 1; + } + if (tree_ret != TREE_REGULAR) + continue; + + /* + * If this file/dir is excluded by a filename + * pattern, skip it. + */ + if (lafe_excluded(bsdtar->matching, name)) + continue; + + /* + * Get lstat() info from the tree library. + */ + lst = tree_current_lstat(tree); + if (lst == NULL) { + /* Couldn't lstat(); must not exist. */ + lafe_warnc(errno, "%s: Cannot stat", name); + /* Return error if files disappear during traverse. */ + bsdtar->return_value = 1; + continue; + } + + /* + * Distinguish 'L'/'P'/'H' symlink following. + */ + switch(symlink_mode) { + case 'H': + /* 'H': After the first item, rest like 'P'. */ + symlink_mode = 'P'; + /* 'H': First item (from command line) like 'L'. */ + /* FALLTHROUGH */ + case 'L': + /* 'L': Do descend through a symlink to dir. */ + descend = tree_current_is_dir(tree); + /* 'L': Follow symlinks to files. */ + archive_read_disk_set_symlink_logical(bsdtar->diskreader); + /* 'L': Archive symlinks as targets, if we can. */ + st = tree_current_stat(tree); + if (st != NULL) + break; + /* If stat fails, we have a broken symlink; + * in that case, don't follow the link. */ + /* FALLTHROUGH */ + default: + /* 'P': Don't descend through a symlink to dir. */ + descend = tree_current_is_physical_dir(tree); + /* 'P': Don't follow symlinks to files. */ + archive_read_disk_set_symlink_physical(bsdtar->diskreader); + /* 'P': Archive symlinks as symlinks. */ + st = lst; + break; + } + + /* + * Are we about to cross to a new filesystem? + */ + if (!dev_recorded) { + /* This is the initial file system. */ + first_dev = lst->st_dev; + dev_recorded = 1; + } else if (lst->st_dev == first_dev) { + /* The starting file system is always acceptable. */ + } else if (descend == 0) { + /* We're not descending, so no need to check. */ + } else if (bsdtar->option_dont_traverse_mounts) { + /* User has asked us not to cross mount points. */ + descend = 0; + } else { + /* We're prepared to cross a mount point. */ + + /* 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. + * + * This is going to be heavily OS dependent: + * FreeBSD's statfs() in conjunction with getvfsbyname() + * provides all of this; NetBSD's statvfs() does + * most of it; other systems will vary. + */ + } + + /* + * In -u mode, check that the file is newer than what's + * already in the archive; in all modes, obey --newerXXX flags. + */ + if (!new_enough(bsdtar, name, st)) + continue; + + archive_entry_free(entry); + entry = archive_entry_new(); + + archive_entry_set_pathname(entry, name); + archive_entry_copy_sourcepath(entry, + tree_current_access_path(tree)); + + /* Populate the archive_entry with metadata from the disk. */ + /* XXX TODO: Arrange to open a regular file before + * calling this so we can pass in an fd and shorten + * the race to query metadata. The linkify dance + * makes this more complex than it might sound. */ +#if defined(_WIN32) && !defined(__CYGWIN__) + /* TODO: tree.c uses stat(), which is badly broken + * on Windows. To fix this, we should + * deprecate tree_current_stat() and provide a new + * call tree_populate_entry(t, entry). This call + * would use stat() internally on POSIX and + * GetInfoByFileHandle() internally on Windows. + * This would be another step towards a tree-walker + * that can be integrated deep into libarchive. + * For now, just set st to NULL on Windows; + * archive_read_disk_entry_from_file() should + * be smart enough to use platform-appropriate + * ways to probe file information. + */ + st = NULL; +#endif + r = archive_read_disk_entry_from_file(bsdtar->diskreader, + entry, -1, st); + 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); + if (r != ARCHIVE_OK) + lafe_warnc(archive_errno(bsdtar->diskreader), + "%s", archive_error_string(bsdtar->diskreader)); + if (r < ARCHIVE_WARN) + continue; + + /* XXX TODO: Just use flag data from entry; avoid the + * duplicate check here. */ + + /* + * If this file/dir is flagged "nodump" and we're + * honoring such flags, skip this file/dir. + */ +#if defined(HAVE_STRUCT_STAT_ST_FLAGS) && defined(UF_NODUMP) + /* BSD systems store flags in struct stat */ + if (bsdtar->option_honor_nodump && + (lst->st_flags & UF_NODUMP)) + continue; +#endif + +#if defined(EXT2_IOC_GETFLAGS) && defined(EXT2_NODUMP_FL) + /* Linux uses ioctl to read flags. */ + if (bsdtar->option_honor_nodump) { + int fd = open(name, O_RDONLY | O_NONBLOCK | O_BINARY); + if (fd >= 0) { + unsigned long fflags; + int r = ioctl(fd, EXT2_IOC_GETFLAGS, &fflags); + close(fd); + if (r >= 0 && (fflags & EXT2_NODUMP_FL)) + continue; + } + } +#endif + + /* + * 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->option_interactive && + !yes("add '%s'", name)) + continue; + + /* Note: if user vetoes, we won't descend. */ + if (descend && !bsdtar->option_no_subdirs) + tree_descend(tree); + + /* + * Rewrite the pathname to be archived. If rewrite + * fails, skip the entry. + */ + if (edit_pathname(bsdtar, entry)) + continue; + + /* Display entry as we process it. + * This format is required by SUSv2. */ + if (bsdtar->verbose) + 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_entry_backend(bsdtar, a, entry); + archive_entry_free(entry); + entry = spare_entry; + spare_entry = NULL; + } + + if (bsdtar->verbose) + fprintf(stderr, "\n"); + } + archive_entry_free(entry); + tree_close(tree); +} + +/* + * Backend for write_entry. + */ +static void +write_entry_backend(struct bsdtar *bsdtar, struct archive *a, + struct archive_entry *entry) +{ + int fd = -1; + int e; + + if (archive_entry_size(entry) > 0) { + const char *pathname = archive_entry_sourcepath(entry); + fd = open(pathname, O_RDONLY | O_BINARY); + if (fd == -1) { + if (!bsdtar->verbose) + lafe_warnc(errno, + "%s: could not open file", pathname); + else + fprintf(stderr, ": %s", strerror(errno)); + return; + } + } + + e = archive_write_header(a, entry); + if (e != ARCHIVE_OK) { + if (!bsdtar->verbose) + 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 && fd >= 0 && archive_entry_size(entry) > 0) { + if (write_file_data(bsdtar, a, entry, fd)) + exit(1); + } + + /* + * If we opened a file, close it now even if there was an error + * which made us decide not to write the archive body. + */ + if (fd >= 0) + close(fd); +} + +static void +report_write(struct bsdtar *bsdtar, struct archive *a, + struct archive_entry *entry, int64_t progress) +{ + uint64_t comp, uncomp; + if (bsdtar->verbose) + fprintf(stderr, "\n"); + comp = archive_position_compressed(a); + uncomp = archive_position_uncompressed(a); + fprintf(stderr, "In: %d files, %s bytes;", + archive_file_count(a), tar_i64toa(uncomp)); + fprintf(stderr, + " Out: %s bytes, compression %d%%\n", + tar_i64toa(comp), (int)((uncomp - comp) * 100 / uncomp)); + /* 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))); +} + + +/* Helper function to copy file to archive. */ +static int +write_file_data(struct bsdtar *bsdtar, struct archive *a, + struct archive_entry *entry, int fd) +{ + ssize_t bytes_read; + ssize_t bytes_written; + int64_t progress = 0; + + bytes_read = read(fd, bsdtar->buff, FILEDATABUFLEN); + while (bytes_read > 0) { + if (need_report()) + report_write(bsdtar, a, entry, progress); + + bytes_written = archive_write_data(a, bsdtar->buff, + bytes_read); + if (bytes_written < 0) { + /* Write failed; this is bad */ + lafe_warnc(0, "%s", archive_error_string(a)); + return (-1); + } + if (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; + bytes_read = read(fd, bsdtar->buff, FILEDATABUFLEN); + } + return 0; +} + +/* + * Test if the specified file is new enough to include in the archive. + */ +static int +new_enough(struct bsdtar *bsdtar, const char *path, const struct stat *st) +{ + struct archive_dir_entry *p; + + /* + * If this file/dir is excluded by a time comparison, skip it. + */ + if (bsdtar->newer_ctime_sec > 0) { + if (st->st_ctime < bsdtar->newer_ctime_sec) + return (0); /* Too old, skip it. */ + if (st->st_ctime == bsdtar->newer_ctime_sec + && ARCHIVE_STAT_CTIME_NANOS(st) + <= bsdtar->newer_ctime_nsec) + return (0); /* Too old, skip it. */ + } + if (bsdtar->newer_mtime_sec > 0) { + if (st->st_mtime < bsdtar->newer_mtime_sec) + return (0); /* Too old, skip it. */ + if (st->st_mtime == bsdtar->newer_mtime_sec + && ARCHIVE_STAT_MTIME_NANOS(st) + <= bsdtar->newer_mtime_nsec) + return (0); /* Too old, skip it. */ + } + + /* + * In -u mode, we only write an entry if it's newer than + * what was already in the archive. + */ + if (bsdtar->archive_dir != NULL && + bsdtar->archive_dir->head != NULL) { + for (p = bsdtar->archive_dir->head; p != NULL; p = p->next) { + if (pathcmp(path, p->name)==0) + return (p->mtime_sec < st->st_mtime || + (p->mtime_sec == st->st_mtime && + p->mtime_nsec + < ARCHIVE_STAT_MTIME_NANOS(st))); + } + } + + /* If the file wasn't rejected, include it. */ + return (1); +} + +/* + * Add an entry to the dir list for 'u' mode. + * + * XXX TODO: Make this fast. + */ +static void +add_dir_list(struct bsdtar *bsdtar, const char *path, + time_t mtime_sec, int mtime_nsec) +{ + struct archive_dir_entry *p; + + /* + * Search entire list to see if this file has appeared before. + * If it has, override the timestamp data. + */ + p = bsdtar->archive_dir->head; + while (p != NULL) { + if (strcmp(path, p->name)==0) { + p->mtime_sec = mtime_sec; + p->mtime_nsec = mtime_nsec; + return; + } + p = p->next; + } + + p = malloc(sizeof(*p)); + if (p == NULL) + lafe_errc(1, ENOMEM, "Can't read archive directory"); + + p->name = strdup(path); + if (p->name == NULL) + lafe_errc(1, ENOMEM, "Can't read archive directory"); + p->mtime_sec = mtime_sec; + p->mtime_nsec = mtime_nsec; + p->next = NULL; + if (bsdtar->archive_dir->tail == NULL) { + bsdtar->archive_dir->head = bsdtar->archive_dir->tail = p; + } else { + bsdtar->archive_dir->tail->next = p; + bsdtar->archive_dir->tail = p; + } +} + +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 (bsdtar->create_compression != 0) + lafe_errc(1, 0, + "Cannot append to %s with compression", bsdtar->filename); + + 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"); +*/ + +} |
