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freebsd-skq/usr.bin/tar/write.c
Tim Kientzle 2372ae680f Allow appending to archives on block devices as well as 
archives in regular files, since both are seekable.

Thanks to: Reinoud Zandijk (@netbsd.org)
2008-02-19 05:27:17 +00:00

1551 lines
40 KiB
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/*-
* 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("$FreeBSD$");
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_ACL_H
#include <sys/acl.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_EXT2FS_EXT2_FS_H
#include <ext2fs/ext2_fs.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_FNMATCH_H
#include <fnmatch.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_LINUX_FS_H
#include <linux/fs.h> /* for Linux file flags */
#endif
#ifdef HAVE_LINUX_EXT2_FS_H
#include <linux/ext2_fs.h> /* for Linux file flags */
#endif
#ifdef HAVE_PWD_H
#include <pwd.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 "tree.h"
/* Fixed size of uname/gname caches. */
#define name_cache_size 101
static const char * const NO_NAME = "(noname)";
/* Initial size of link cache. */
#define links_cache_initial_size 1024
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 links_cache {
unsigned long number_entries;
size_t number_buckets;
struct links_entry **buckets;
};
struct links_entry {
struct links_entry *next;
struct links_entry *previous;
int links;
dev_t dev;
ino_t ino;
char *name;
};
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 archive_names_from_file_helper(struct bsdtar *bsdtar,
const char *line);
static int copy_file_data(struct bsdtar *bsdtar,
struct archive *a, struct archive *ina);
static void create_cleanup(struct bsdtar *);
static void free_buckets(struct bsdtar *, struct links_cache *);
static void free_cache(struct name_cache *cache);
static const char * lookup_gname(struct bsdtar *bsdtar, gid_t gid);
static int lookup_gname_helper(struct bsdtar *bsdtar,
const char **name, id_t gid);
static void lookup_hardlink(struct bsdtar *,
struct archive_entry *entry, const struct stat *);
static const char * lookup_uname(struct bsdtar *bsdtar, uid_t uid);
static int lookup_uname_helper(struct bsdtar *bsdtar,
const char **name, id_t uid);
static int new_enough(struct bsdtar *, const char *path,
const struct stat *);
static void setup_acls(struct bsdtar *, struct archive_entry *,
const char *path);
static void setup_xattrs(struct bsdtar *, struct archive_entry *,
const char *path);
static void test_for_append(struct bsdtar *);
static void write_archive(struct archive *, struct bsdtar *);
static void write_entry(struct bsdtar *, struct archive *,
const struct stat *, const char *pathname,
const char *accpath);
static int write_file_data(struct bsdtar *, struct archive *,
int fd);
static void write_hierarchy(struct bsdtar *, struct archive *,
const char *);
void
tar_mode_c(struct bsdtar *bsdtar)
{
struct archive *a;
int r;
if (*bsdtar->argv == NULL && bsdtar->names_from_file == NULL)
bsdtar_errc(bsdtar, 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(bsdtar);
}
/*
* 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:
archive_write_set_compression_none(a);
break;
#ifdef HAVE_LIBBZ2
case 'j': case 'y':
archive_write_set_compression_bzip2(a);
break;
#endif
#ifdef HAVE_LIBZ
case 'z':
archive_write_set_compression_gzip(a);
break;
#endif
default:
bsdtar_errc(bsdtar, 1, 0,
"Unrecognized compression option -%c",
bsdtar->create_compression);
}
}
r = archive_write_open_file(a, bsdtar->filename);
if (r != ARCHIVE_OK)
bsdtar_errc(bsdtar, 1, 0, archive_error_string(a));
write_archive(a, bsdtar);
if (bsdtar->option_totals) {
fprintf(stderr, "Total bytes written: " BSDTAR_FILESIZE_PRINTF "\n",
(BSDTAR_FILESIZE_TYPE)archive_position_compressed(a));
}
archive_write_finish(a);
}
/*
* Same as 'c', except we only support tar or empty formats in
* uncompressed files on disk.
*/
void
tar_mode_r(struct bsdtar *bsdtar)
{
off_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;
bsdtar->fd = open(bsdtar->filename, O_RDWR | O_CREAT, 0666);
if (bsdtar->fd < 0)
bsdtar_errc(bsdtar, 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)
bsdtar_errc(bsdtar, 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);
bsdtar_errc(bsdtar, 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) {
bsdtar_errc(bsdtar, 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);
}
lseek(bsdtar->fd, end_offset, SEEK_SET); /* XXX check return val XXX */
archive_write_open_fd(a, bsdtar->fd); /* XXX check return val XXX */
write_archive(a, bsdtar); /* XXX check return val XXX */
if (bsdtar->option_totals) {
fprintf(stderr, "Total bytes written: " BSDTAR_FILESIZE_PRINTF "\n",
(BSDTAR_FILESIZE_TYPE)archive_position_compressed(a));
}
archive_write_finish(a);
close(bsdtar->fd);
bsdtar->fd = -1;
}
void
tar_mode_u(struct bsdtar *bsdtar)
{
off_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);
if (bsdtar->fd < 0)
bsdtar_errc(bsdtar, 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) {
bsdtar_errc(bsdtar, 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);
bsdtar_errc(bsdtar, 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);
lseek(bsdtar->fd, end_offset, SEEK_SET);
ftruncate(bsdtar->fd, end_offset);
archive_write_open_fd(a, bsdtar->fd);
write_archive(a, bsdtar);
if (bsdtar->option_totals) {
fprintf(stderr, "Total bytes written: " BSDTAR_FILESIZE_PRINTF "\n",
(BSDTAR_FILESIZE_TYPE)archive_position_compressed(a));
}
archive_write_finish(a);
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;
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) {
bsdtar_warnc(bsdtar, 1, 0,
"Missing argument for -C");
bsdtar->return_value = 1;
return;
}
}
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++;
}
create_cleanup(bsdtar);
if (archive_write_close(a)) {
bsdtar_warnc(bsdtar, 0, "%s", archive_error_string(a));
bsdtar->return_value = 1;
}
}
/*
* 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.
*/
void
archive_names_from_file(struct bsdtar *bsdtar, struct archive *a)
{
bsdtar->archive = a;
bsdtar->next_line_is_dir = 0;
process_lines(bsdtar, bsdtar->names_from_file,
archive_names_from_file_helper);
if (bsdtar->next_line_is_dir)
bsdtar_errc(bsdtar, 1, errno,
"Unexpected end of filename list; "
"directory expected after -C");
}
static int
archive_names_from_file_helper(struct bsdtar *bsdtar, const char *line)
{
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, bsdtar->archive, line);
}
return (0);
}
/*
* 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)) {
bsdtar_warnc(bsdtar, 0, "%s", archive_error_string(ina));
bsdtar->return_value = 1;
return (0);
}
rc = append_archive(bsdtar, a, ina);
if (archive_errno(ina)) {
bsdtar_warnc(bsdtar, 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 (0 == archive_read_next_header(ina, &in_entry)) {
if (!new_enough(bsdtar, archive_entry_pathname(in_entry),
archive_entry_stat(in_entry)))
continue;
if (excluded(bsdtar, 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));
e = archive_write_header(a, in_entry);
if (e != ARCHIVE_OK) {
if (!bsdtar->verbose)
bsdtar_warnc(bsdtar, 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 (copy_file_data(bsdtar, a, ina))
exit(1);
if (bsdtar->verbose)
fprintf(stderr, "\n");
}
/* Note: If we got here, we saw no write errors, so return success. */
return (0);
}
/* Helper function to copy data between archives. */
static int
copy_file_data(struct bsdtar *bsdtar, struct archive *a, struct archive *ina)
{
char buff[64*1024];
ssize_t bytes_read;
ssize_t bytes_written;
bytes_read = archive_read_data(ina, buff, sizeof(buff));
while (bytes_read > 0) {
bytes_written = archive_write_data(a, buff, bytes_read);
if (bytes_written < bytes_read) {
bsdtar_warnc(bsdtar, 0, "%s", archive_error_string(a));
return (-1);
}
bytes_read = archive_read_data(ina, buff, sizeof(buff));
}
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 tree *tree;
char symlink_mode = bsdtar->symlink_mode;
dev_t first_dev = 0;
int dev_recorded = 0;
int tree_ret;
#ifdef __linux
int fd, r;
unsigned long fflags;
#endif
tree = tree_open(path);
if (!tree) {
bsdtar_warnc(bsdtar, errno, "%s: Cannot open", path);
bsdtar->return_value = 1;
return;
}
while ((tree_ret = tree_next(tree))) {
const char *name = tree_current_path(tree);
const struct stat *st = NULL, *lst = NULL;
int descend;
if (tree_ret == TREE_ERROR_DIR)
bsdtar_warnc(bsdtar, errno, "%s: Couldn't visit directory", name);
if (tree_ret != TREE_REGULAR)
continue;
lst = tree_current_lstat(tree);
if (lst == NULL) {
/* Couldn't lstat(); must not exist. */
bsdtar_warnc(bsdtar, errno, "%s: Cannot stat", name);
/*
* Report an error via the exit code if the failed
* path is a prefix of what the user provided via
* the command line. (Testing for string equality
* here won't work due to trailing '/' characters.)
*/
if (memcmp(name, path, strlen(name)) == 0)
bsdtar->return_value = 1;
continue;
}
if (S_ISLNK(lst->st_mode))
st = tree_current_stat(tree);
/* Default: descend into any dir or symlink to dir. */
/* We'll adjust this later on. */
descend = 0;
if ((st != NULL) && S_ISDIR(st->st_mode))
descend = 1;
if ((lst != NULL) && S_ISDIR(lst->st_mode))
descend = 1;
/*
* If user has asked us not to cross mount points,
* then don't descend into into a dir on a different
* device.
*/
if (!dev_recorded) {
first_dev = lst->st_dev;
dev_recorded = 1;
}
if (bsdtar->option_dont_traverse_mounts) {
if (lst != NULL && lst->st_dev != first_dev)
descend = 0;
}
/*
* If this file/dir is flagged "nodump" and we're
* honoring such flags, skip this file/dir.
*/
#ifdef HAVE_CHFLAGS
if (bsdtar->option_honor_nodump &&
(lst->st_flags & UF_NODUMP))
continue;
#endif
#ifdef __linux
/*
* Linux has a nodump flag too but to read it
* we have to open() the file/dir and do an ioctl on it...
*/
if (bsdtar->option_honor_nodump &&
((fd = open(name, O_RDONLY|O_NONBLOCK)) >= 0) &&
((r = ioctl(fd, EXT2_IOC_GETFLAGS, &fflags)),
close(fd), r) >= 0 &&
(fflags & EXT2_NODUMP_FL))
continue;
#endif
/*
* If this file/dir is excluded by a filename
* pattern, skip it.
*/
if (excluded(bsdtar, name))
continue;
/*
* If the user vetoes this file/directory, skip it.
*/
if (bsdtar->option_interactive &&
!yes("add '%s'", name))
continue;
/*
* If this is a dir, decide whether or not to recurse.
*/
if (bsdtar->option_no_subdirs)
descend = 0;
/*
* 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. */
/* 'L': Archive symlink to file as file. */
lst = tree_current_stat(tree);
/* If stat fails, we have a broken symlink;
* in that case, archive the link as such. */
if (lst == NULL)
lst = tree_current_lstat(tree);
break;
default:
/* 'P': Don't descend through a symlink to dir. */
if (!S_ISDIR(lst->st_mode))
descend = 0;
/* 'P': Archive symlink to file as symlink. */
/* lst = tree_current_lstat(tree); */
break;
}
if (descend)
tree_descend(tree);
/*
* Write the entry. Note that write_entry() handles
* pathname editing and newness testing.
*/
write_entry(bsdtar, a, lst, name,
tree_current_access_path(tree));
}
tree_close(tree);
}
/*
* Add a single filesystem object to the archive.
*/
static void
write_entry(struct bsdtar *bsdtar, struct archive *a, const struct stat *st,
const char *pathname, const char *accpath)
{
struct archive_entry *entry;
int e;
int fd;
#ifdef __linux
int r;
unsigned long stflags;
#endif
static char linkbuffer[PATH_MAX+1];
fd = -1;
entry = archive_entry_new();
archive_entry_set_pathname(entry, pathname);
/*
* Rewrite the pathname to be archived. If rewrite
* fails, skip the entry.
*/
if (edit_pathname(bsdtar, entry))
goto abort;
/*
* 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, archive_entry_pathname(entry), st))
goto abort;
if (!S_ISDIR(st->st_mode) && (st->st_nlink > 1))
lookup_hardlink(bsdtar, entry, st);
/* Display entry as we process it. This format is required by SUSv2. */
if (bsdtar->verbose)
safe_fprintf(stderr, "a %s", archive_entry_pathname(entry));
/* Read symbolic link information. */
if ((st->st_mode & S_IFMT) == S_IFLNK) {
int lnklen;
lnklen = readlink(accpath, linkbuffer, PATH_MAX);
if (lnklen < 0) {
if (!bsdtar->verbose)
bsdtar_warnc(bsdtar, errno,
"%s: Couldn't read symbolic link",
pathname);
else
safe_fprintf(stderr,
": Couldn't read symbolic link: %s",
strerror(errno));
goto cleanup;
}
linkbuffer[lnklen] = 0;
archive_entry_set_symlink(entry, linkbuffer);
}
/* Look up username and group name. */
archive_entry_set_uname(entry, lookup_uname(bsdtar, st->st_uid));
archive_entry_set_gname(entry, lookup_gname(bsdtar, st->st_gid));
#ifdef HAVE_CHFLAGS
if (st->st_flags != 0)
archive_entry_set_fflags(entry, st->st_flags, 0);
#endif
#ifdef __linux
if ((S_ISREG(st->st_mode) || S_ISDIR(st->st_mode)) &&
((fd = open(accpath, O_RDONLY|O_NONBLOCK)) >= 0) &&
((r = ioctl(fd, EXT2_IOC_GETFLAGS, &stflags)), close(fd), (fd = -1), r) >= 0 &&
stflags) {
archive_entry_set_fflags(entry, stflags, 0);
}
#endif
archive_entry_copy_stat(entry, st);
setup_acls(bsdtar, entry, accpath);
setup_xattrs(bsdtar, entry, accpath);
/*
* If it's a regular file (and non-zero in size) make sure we
* can open it before we start to write. In particular, note
* that we can always archive a zero-length file, even if we
* can't read it.
*/
if (S_ISREG(st->st_mode) && st->st_size > 0) {
fd = open(accpath, O_RDONLY);
if (fd < 0) {
if (!bsdtar->verbose)
bsdtar_warnc(bsdtar, errno, "%s: could not open file", pathname);
else
fprintf(stderr, ": %s", strerror(errno));
goto cleanup;
}
}
/* Non-regular files get archived with zero size. */
if (!S_ISREG(st->st_mode))
archive_entry_set_size(entry, 0);
e = archive_write_header(a, entry);
if (e != ARCHIVE_OK) {
if (!bsdtar->verbose)
bsdtar_warnc(bsdtar, 0, "%s: %s", pathname,
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, fd))
exit(1);
cleanup:
if (bsdtar->verbose)
fprintf(stderr, "\n");
abort:
if (fd >= 0)
close(fd);
if (entry != NULL)
archive_entry_free(entry);
}
/* Helper function to copy file to archive, with stack-allocated buffer. */
static int
write_file_data(struct bsdtar *bsdtar, struct archive *a, int fd)
{
char buff[64*1024];
ssize_t bytes_read;
ssize_t bytes_written;
/* XXX TODO: Allocate buffer on heap and store pointer to
* it in bsdtar structure; arrange cleanup as well. XXX */
bytes_read = read(fd, buff, sizeof(buff));
while (bytes_read > 0) {
bytes_written = archive_write_data(a, buff, bytes_read);
if (bytes_written < 0) {
/* Write failed; this is bad */
bsdtar_warnc(bsdtar, 0, "%s", archive_error_string(a));
return (-1);
}
if (bytes_written < bytes_read) {
/* Write was truncated; warn but continue. */
bsdtar_warnc(bsdtar, 0,
"Truncated write; file may have grown while being archived.");
return (0);
}
bytes_read = read(fd, buff, sizeof(buff));
}
return 0;
}
static void
create_cleanup(struct bsdtar *bsdtar)
{
/* Free inode->pathname map used for hardlink detection. */
if (bsdtar->links_cache != NULL) {
free_buckets(bsdtar, bsdtar->links_cache);
free(bsdtar->links_cache);
bsdtar->links_cache = NULL;
}
free_cache(bsdtar->uname_cache);
bsdtar->uname_cache = NULL;
free_cache(bsdtar->gname_cache);
bsdtar->gname_cache = NULL;
}
static void
free_buckets(struct bsdtar *bsdtar, struct links_cache *links_cache)
{
size_t i;
if (links_cache->buckets == NULL)
return;
for (i = 0; i < links_cache->number_buckets; i++) {
while (links_cache->buckets[i] != NULL) {
struct links_entry *lp = links_cache->buckets[i]->next;
if (bsdtar->option_warn_links)
bsdtar_warnc(bsdtar, 0, "Missing links to %s",
links_cache->buckets[i]->name);
if (links_cache->buckets[i]->name != NULL)
free(links_cache->buckets[i]->name);
free(links_cache->buckets[i]);
links_cache->buckets[i] = lp;
}
}
free(links_cache->buckets);
links_cache->buckets = NULL;
}
static void
lookup_hardlink(struct bsdtar *bsdtar, struct archive_entry *entry,
const struct stat *st)
{
struct links_cache *links_cache;
struct links_entry *le, **new_buckets;
int hash;
size_t i, new_size;
/* If necessary, initialize the links cache. */
links_cache = bsdtar->links_cache;
if (links_cache == NULL) {
bsdtar->links_cache = malloc(sizeof(struct links_cache));
if (bsdtar->links_cache == NULL)
bsdtar_errc(bsdtar, 1, ENOMEM,
"No memory for hardlink detection.");
links_cache = bsdtar->links_cache;
memset(links_cache, 0, sizeof(struct links_cache));
links_cache->number_buckets = links_cache_initial_size;
links_cache->buckets = malloc(links_cache->number_buckets *
sizeof(links_cache->buckets[0]));
if (links_cache->buckets == NULL) {
bsdtar_errc(bsdtar, 1, ENOMEM,
"No memory for hardlink detection.");
}
for (i = 0; i < links_cache->number_buckets; i++)
links_cache->buckets[i] = NULL;
}
/* If the links cache overflowed and got flushed, don't bother. */
if (links_cache->buckets == NULL)
return;
/* If the links cache is getting too full, enlarge the hash table. */
if (links_cache->number_entries > links_cache->number_buckets * 2)
{
new_size = links_cache->number_buckets * 2;
new_buckets = malloc(new_size * sizeof(struct links_entry *));
if (new_buckets != NULL) {
memset(new_buckets, 0,
new_size * sizeof(struct links_entry *));
for (i = 0; i < links_cache->number_buckets; i++) {
while (links_cache->buckets[i] != NULL) {
/* Remove entry from old bucket. */
le = links_cache->buckets[i];
links_cache->buckets[i] = le->next;
/* Add entry to new bucket. */
hash = (le->dev ^ le->ino) % new_size;
if (new_buckets[hash] != NULL)
new_buckets[hash]->previous =
le;
le->next = new_buckets[hash];
le->previous = NULL;
new_buckets[hash] = le;
}
}
free(links_cache->buckets);
links_cache->buckets = new_buckets;
links_cache->number_buckets = new_size;
} else {
free_buckets(bsdtar, links_cache);
bsdtar_warnc(bsdtar, ENOMEM,
"No more memory for recording hard links");
bsdtar_warnc(bsdtar, 0,
"Remaining links will be dumped as full files");
}
}
/* Try to locate this entry in the links cache. */
hash = ( st->st_dev ^ st->st_ino ) % links_cache->number_buckets;
for (le = links_cache->buckets[hash]; le != NULL; le = le->next) {
if (le->dev == st->st_dev && le->ino == st->st_ino) {
archive_entry_copy_hardlink(entry, le->name);
/*
* Decrement link count each time and release
* the entry if it hits zero. This saves
* memory and is necessary for proper -l
* implementation.
*/
if (--le->links <= 0) {
if (le->previous != NULL)
le->previous->next = le->next;
if (le->next != NULL)
le->next->previous = le->previous;
if (le->name != NULL)
free(le->name);
if (links_cache->buckets[hash] == le)
links_cache->buckets[hash] = le->next;
links_cache->number_entries--;
free(le);
}
return;
}
}
/* Add this entry to the links cache. */
le = malloc(sizeof(struct links_entry));
if (le != NULL)
le->name = strdup(archive_entry_pathname(entry));
if ((le == NULL) || (le->name == NULL)) {
free_buckets(bsdtar, links_cache);
bsdtar_warnc(bsdtar, ENOMEM,
"No more memory for recording hard links");
bsdtar_warnc(bsdtar, 0,
"Remaining hard links will be dumped as full files");
if (le != NULL)
free(le);
return;
}
if (links_cache->buckets[hash] != NULL)
links_cache->buckets[hash]->previous = le;
links_cache->number_entries++;
le->next = links_cache->buckets[hash];
le->previous = NULL;
links_cache->buckets[hash] = le;
le->dev = st->st_dev;
le->ino = st->st_ino;
le->links = st->st_nlink - 1;
}
#ifdef HAVE_POSIX_ACL
static void setup_acl(struct bsdtar *bsdtar,
struct archive_entry *entry, const char *accpath,
int acl_type, int archive_entry_acl_type);
static void
setup_acls(struct bsdtar *bsdtar, struct archive_entry *entry,
const char *accpath)
{
archive_entry_acl_clear(entry);
setup_acl(bsdtar, entry, accpath,
ACL_TYPE_ACCESS, ARCHIVE_ENTRY_ACL_TYPE_ACCESS);
/* Only directories can have default ACLs. */
if (S_ISDIR(archive_entry_mode(entry)))
setup_acl(bsdtar, entry, accpath,
ACL_TYPE_DEFAULT, ARCHIVE_ENTRY_ACL_TYPE_DEFAULT);
}
static void
setup_acl(struct bsdtar *bsdtar, struct archive_entry *entry,
const char *accpath, int acl_type, int archive_entry_acl_type)
{
acl_t acl;
acl_tag_t acl_tag;
acl_entry_t acl_entry;
acl_permset_t acl_permset;
int s, ae_id, ae_tag, ae_perm;
const char *ae_name;
/* Retrieve access ACL from file. */
acl = acl_get_file(accpath, acl_type);
if (acl != NULL) {
s = acl_get_entry(acl, ACL_FIRST_ENTRY, &acl_entry);
while (s == 1) {
ae_id = -1;
ae_name = NULL;
acl_get_tag_type(acl_entry, &acl_tag);
if (acl_tag == ACL_USER) {
ae_id = (int)*(uid_t *)acl_get_qualifier(acl_entry);
ae_name = lookup_uname(bsdtar, ae_id);
ae_tag = ARCHIVE_ENTRY_ACL_USER;
} else if (acl_tag == ACL_GROUP) {
ae_id = (int)*(gid_t *)acl_get_qualifier(acl_entry);
ae_name = lookup_gname(bsdtar, ae_id);
ae_tag = ARCHIVE_ENTRY_ACL_GROUP;
} else if (acl_tag == ACL_MASK) {
ae_tag = ARCHIVE_ENTRY_ACL_MASK;
} else if (acl_tag == ACL_USER_OBJ) {
ae_tag = ARCHIVE_ENTRY_ACL_USER_OBJ;
} else if (acl_tag == ACL_GROUP_OBJ) {
ae_tag = ARCHIVE_ENTRY_ACL_GROUP_OBJ;
} else if (acl_tag == ACL_OTHER) {
ae_tag = ARCHIVE_ENTRY_ACL_OTHER;
} else {
/* Skip types that libarchive can't support. */
continue;
}
acl_get_permset(acl_entry, &acl_permset);
ae_perm = 0;
/*
* acl_get_perm() is spelled differently on different
* platforms; see bsdtar_platform.h for details.
*/
if (ACL_GET_PERM(acl_permset, ACL_EXECUTE))
ae_perm |= ARCHIVE_ENTRY_ACL_EXECUTE;
if (ACL_GET_PERM(acl_permset, ACL_READ))
ae_perm |= ARCHIVE_ENTRY_ACL_READ;
if (ACL_GET_PERM(acl_permset, ACL_WRITE))
ae_perm |= ARCHIVE_ENTRY_ACL_WRITE;
archive_entry_acl_add_entry(entry,
archive_entry_acl_type, ae_perm, ae_tag,
ae_id, ae_name);
s = acl_get_entry(acl, ACL_NEXT_ENTRY, &acl_entry);
}
acl_free(acl);
}
}
#else
static void
setup_acls(struct bsdtar *bsdtar, struct archive_entry *entry,
const char *accpath)
{
(void)bsdtar;
(void)entry;
(void)accpath;
}
#endif
#if HAVE_LISTXATTR && HAVE_LLISTXATTR && HAVE_GETXATTR && HAVE_LGETXATTR
static void
setup_xattr(struct bsdtar *bsdtar, struct archive_entry *entry,
const char *accpath, const char *name)
{
size_t size;
void *value = NULL;
char symlink_mode = bsdtar->symlink_mode;
if (symlink_mode == 'H')
size = getxattr(accpath, name, NULL, 0);
else
size = lgetxattr(accpath, name, NULL, 0);
if (size == -1) {
bsdtar_warnc(bsdtar, errno, "Couldn't get extended attribute");
return;
}
if (size > 0 && (value = malloc(size)) == NULL) {
bsdtar_errc(bsdtar, 1, errno, "Out of memory");
return;
}
if (symlink_mode == 'H')
size = getxattr(accpath, name, value, size);
else
size = lgetxattr(accpath, name, value, size);
if (size == -1) {
bsdtar_warnc(bsdtar, errno, "Couldn't get extended attribute");
return;
}
archive_entry_xattr_add_entry(entry, name, value, size);
free(value);
}
/*
* Linux extended attribute support
*/
static void
setup_xattrs(struct bsdtar *bsdtar, struct archive_entry *entry,
const char *accpath)
{
char *list, *p;
size_t list_size;
char symlink_mode = bsdtar->symlink_mode;
if (symlink_mode == 'H')
list_size = listxattr(accpath, NULL, 0);
else
list_size = llistxattr(accpath, NULL, 0);
if (list_size == -1) {
bsdtar_warnc(bsdtar, errno,
"Couldn't list extended attributes");
return;
} else if (list_size == 0)
return;
if ((list = malloc(list_size)) == NULL) {
bsdtar_errc(bsdtar, 1, errno, "Out of memory");
return;
}
if (symlink_mode == 'H')
list_size = listxattr(accpath, list, list_size);
else
list_size = llistxattr(accpath, list, list_size);
if (list_size == -1) {
bsdtar_warnc(bsdtar, errno,
"Couldn't list extended attributes");
free(list);
return;
}
for (p = list; (p - list) < list_size; p += strlen(p) + 1) {
if (strncmp(p, "system.", 7) == 0 ||
strncmp(p, "xfsroot.", 8) == 0)
continue;
setup_xattr(bsdtar, entry, accpath, p);
}
free(list);
}
#else
/*
* Generic (stub) extended attribute support.
*/
static void
setup_xattrs(struct bsdtar *bsdtar, struct archive_entry *entry,
const char *accpath)
{
(void)bsdtar; /* UNUSED */
(void)entry; /* UNUSED */
(void)accpath; /* UNUSED */
}
#endif
static void
free_cache(struct name_cache *cache)
{
size_t i;
if (cache != NULL) {
for (i = 0; i < cache->size; i++) {
if (cache->cache[i].name != NULL &&
cache->cache[i].name != NO_NAME)
free((void *)(uintptr_t)cache->cache[i].name);
}
free(cache);
}
}
/*
* Lookup uid/gid from uname/gname, return NULL if no match.
*/
static const char *
lookup_name(struct bsdtar *bsdtar, struct name_cache **name_cache_variable,
int (*lookup_fn)(struct bsdtar *, const char **, id_t), id_t id)
{
struct name_cache *cache;
const char *name;
int slot;
if (*name_cache_variable == NULL) {
*name_cache_variable = malloc(sizeof(struct name_cache));
if (*name_cache_variable == NULL)
bsdtar_errc(bsdtar, 1, ENOMEM, "No more memory");
memset(*name_cache_variable, 0, sizeof(struct name_cache));
(*name_cache_variable)->size = name_cache_size;
}
cache = *name_cache_variable;
cache->probes++;
slot = id % cache->size;
if (cache->cache[slot].name != NULL) {
if (cache->cache[slot].id == id) {
cache->hits++;
if (cache->cache[slot].name == NO_NAME)
return (NULL);
return (cache->cache[slot].name);
}
if (cache->cache[slot].name != NO_NAME)
free((void *)(uintptr_t)cache->cache[slot].name);
cache->cache[slot].name = NULL;
}
if (lookup_fn(bsdtar, &name, id) == 0) {
if (name == NULL || name[0] == '\0') {
/* Cache the negative response. */
cache->cache[slot].name = NO_NAME;
cache->cache[slot].id = id;
} else {
cache->cache[slot].name = strdup(name);
if (cache->cache[slot].name != NULL) {
cache->cache[slot].id = id;
return (cache->cache[slot].name);
}
/*
* Conveniently, NULL marks an empty slot, so
* if the strdup() fails, we've just failed to
* cache it. No recovery necessary.
*/
}
}
return (NULL);
}
static const char *
lookup_uname(struct bsdtar *bsdtar, uid_t uid)
{
return (lookup_name(bsdtar, &bsdtar->uname_cache,
&lookup_uname_helper, (id_t)uid));
}
static int
lookup_uname_helper(struct bsdtar *bsdtar, const char **name, id_t id)
{
struct passwd *pwent;
(void)bsdtar; /* UNUSED */
errno = 0;
pwent = getpwuid((uid_t)id);
if (pwent == NULL) {
*name = NULL;
if (errno != 0)
bsdtar_warnc(bsdtar, errno, "getpwuid(%d) failed", id);
return (errno);
}
*name = pwent->pw_name;
return (0);
}
static const char *
lookup_gname(struct bsdtar *bsdtar, gid_t gid)
{
return (lookup_name(bsdtar, &bsdtar->gname_cache,
&lookup_gname_helper, (id_t)gid));
}
static int
lookup_gname_helper(struct bsdtar *bsdtar, const char **name, id_t id)
{
struct group *grent;
(void)bsdtar; /* UNUSED */
errno = 0;
grent = getgrgid((gid_t)id);
if (grent == NULL) {
*name = NULL;
if (errno != 0)
bsdtar_warnc(bsdtar, errno, "getgrgid(%d) failed", id);
return (errno);
}
*name = grent->gr_name;
return (0);
}
/*
* Test if the specified file is new enough to include in the archive.
*/
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)
bsdtar_errc(bsdtar, 1, ENOMEM, "Can't read archive directory");
p->name = strdup(path);
if (p->name == NULL)
bsdtar_errc(bsdtar, 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;
}
}
void
test_for_append(struct bsdtar *bsdtar)
{
struct stat s;
if (*bsdtar->argv == NULL)
bsdtar_errc(bsdtar, 1, 0, "no files or directories specified");
if (bsdtar->filename == NULL)
bsdtar_errc(bsdtar, 1, 0, "Cannot append to stdout.");
if (bsdtar->create_compression != 0)
bsdtar_errc(bsdtar, 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))
bsdtar_errc(bsdtar, 1, 0,
"Cannot append to %s: not a regular file.",
bsdtar->filename);
}
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