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ccded773b6
freebsd-skq/usr.bin/cpio/cpio.c
kientzle ccded773b6 Preserve ownership if cpio is run as root.
2008-07-06 16:39:18 +00:00

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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
* in this position and unchanged.
* 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 "cpio_platform.h"
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <archive.h>
#include <archive_entry.h>
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_STDARG_H
#include <stdarg.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 "cpio.h"
#include "matching.h"
static int copy_data(struct archive *, struct archive *);
static const char *cpio_rename(const char *name);
static int entry_to_archive(struct cpio *, struct archive_entry *);
static int file_to_archive(struct cpio *, const char *);
static void long_help(void);
static void mode_in(struct cpio *);
static void mode_list(struct cpio *);
static void mode_out(struct cpio *);
static void mode_pass(struct cpio *, const char *);
static void restore_time(struct cpio *, struct archive_entry *,
const char *, int fd);
static void usage(void);
static void version(void);
int
main(int argc, char *argv[])
{
static char buff[16384];
struct cpio _cpio; /* Allocated on stack. */
struct cpio *cpio;
int uid, gid;
int opt;
cpio = &_cpio;
memset(cpio, 0, sizeof(*cpio));
cpio->buff = buff;
cpio->buff_size = sizeof(buff);
/* Need cpio_progname before calling cpio_warnc. */
if (*argv == NULL)
cpio_progname = "bsdcpio";
else {
cpio_progname = strrchr(*argv, '/');
if (cpio_progname != NULL)
cpio_progname++;
else
cpio_progname = *argv;
}
cpio->uid_override = -1;
cpio->gid_override = -1;
cpio->argv = argv;
cpio->argc = argc;
cpio->line_separator = '\n';
cpio->mode = '\0';
cpio->verbose = 0;
cpio->compress = '\0';
/* TODO: Implement old binary format in libarchive, use that here. */
cpio->format = "odc"; /* Default format */
cpio->extract_flags = ARCHIVE_EXTRACT_NO_AUTODIR;
cpio->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER;
cpio->extract_flags |= ARCHIVE_EXTRACT_SECURE_SYMLINKS;
cpio->extract_flags |= ARCHIVE_EXTRACT_SECURE_NODOTDOT;
if (geteuid() == 0)
cpio->extract_flags |= ARCHIVE_EXTRACT_OWNER;
cpio->bytes_per_block = 512;
cpio->filename = NULL;
while ((opt = cpio_getopt(cpio)) != -1) {
switch (opt) {
case '0': /* GNU convention: --null, -0 */
cpio->line_separator = '\0';
break;
case 'A': /* NetBSD/OpenBSD */
cpio->option_append = 1;
break;
case 'a': /* POSIX 1997 */
cpio->option_atime_restore = 1;
break;
case 'B': /* POSIX 1997 */
cpio->bytes_per_block = 5120;
break;
case 'C': /* NetBSD/OpenBSD */
cpio->bytes_per_block = atoi(optarg);
if (cpio->bytes_per_block <= 0)
cpio_errc(1, 0, "Invalid blocksize %s", optarg);
break;
case 'c': /* POSIX 1997 */
cpio->format = "odc";
break;
case 'd': /* POSIX 1997 */
cpio->extract_flags &= ~ARCHIVE_EXTRACT_NO_AUTODIR;
break;
case 'E': /* NetBSD/OpenBSD */
include_from_file(cpio, optarg);
break;
case 'F': /* NetBSD/OpenBSD/GNU cpio */
cpio->filename = optarg;
break;
case 'f': /* POSIX 1997 */
exclude(cpio, optarg);
break;
case 'H': /* GNU cpio (also --format) */
cpio->format = optarg;
break;
case 'h':
long_help();
break;
case 'I': /* NetBSD/OpenBSD */
cpio->filename = optarg;
break;
case 'i': /* POSIX 1997 */
cpio->mode = opt;
break;
case OPTION_INSECURE:
cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_SYMLINKS;
cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_NODOTDOT;
break;
case 'L': /* GNU cpio */
cpio->option_follow_links = 1;
break;
case 'l': /* POSIX 1997 */
cpio->option_link = 1;
break;
case 'm': /* POSIX 1997 */
cpio->extract_flags |= ARCHIVE_EXTRACT_TIME;
break;
case 'O': /* GNU cpio */
cpio->filename = optarg;
break;
case 'o': /* POSIX 1997 */
cpio->mode = opt;
break;
case 'p': /* POSIX 1997 */
cpio->mode = opt;
cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_NODOTDOT;
break;
case OPTION_QUIET: /* GNU cpio */
cpio->quiet = 1;
break;
case 'R': /* GNU cpio, also --owner */
if (owner_parse(optarg, &uid, &gid))
usage();
if (uid != -1)
cpio->uid_override = uid;
if (gid != -1)
cpio->gid_override = gid;
break;
case 'r': /* POSIX 1997 */
cpio->option_rename = 1;
break;
case 't': /* POSIX 1997 */
cpio->option_list = 1;
break;
case 'u': /* POSIX 1997 */
cpio->extract_flags
&= ~ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER;
break;
case 'v': /* POSIX 1997 */
cpio->verbose++;
break;
case OPTION_VERSION: /* GNU convention */
version();
break;
#if 0
/*
* cpio_getopt() handles -W specially, so it's not
* available here.
*/
case 'W': /* Obscure, but useful GNU convention. */
break;
#endif
case 'y': /* tar convention */
cpio->compress = opt;
break;
case 'Z': /* tar convention */
cpio->compress = opt;
break;
case 'z': /* tar convention */
cpio->compress = opt;
break;
default:
usage();
}
}
/* TODO: Sanity-check args, error out on nonsensical combinations. */
cpio->argc -= optind;
cpio->argv += optind;
switch (cpio->mode) {
case 'o':
mode_out(cpio);
break;
case 'i':
while (*cpio->argv != NULL) {
include(cpio, *cpio->argv);
--cpio->argc;
++cpio->argv;
}
if (cpio->option_list)
mode_list(cpio);
else
mode_in(cpio);
break;
case 'p':
if (*cpio->argv == NULL || **cpio->argv == '\0')
cpio_errc(1, 0,
"-p mode requires a target directory");
mode_pass(cpio, *cpio->argv);
break;
default:
cpio_errc(1, 0,
"Must specify at least one of -i, -o, or -p");
}
return (0);
}
void
usage(void)
{
const char *p;
p = cpio_progname;
fprintf(stderr, "Brief Usage:\n");
fprintf(stderr, " List: %s -it < archive\n", p);
fprintf(stderr, " Extract: %s -i < archive\n", p);
fprintf(stderr, " Create: %s -o < filenames > archive\n", p);
#ifdef HAVE_GETOPT_LONG
fprintf(stderr, " Help: %s --help\n", p);
#else
fprintf(stderr, " Help: %s -h\n", p);
#endif
exit(1);
}
static const char *long_help_msg =
"First option must be a mode specifier:\n"
" -i Input -o Output -p Pass\n"
"Common Options:\n"
" -v Verbose\n"
"Create: %p -o [options] < [list of files] > [archive]\n"
" -z, -y Compress archive with gzip/bzip2\n"
" --format {odc|newc|ustar} Select archive format\n"
"List: %p -it < [archive]\n"
"Extract: %p -i [options] < [archive]\n";
/*
* Note that the word 'bsdcpio' will always appear in the first line
* of output.
*
* In particular, /bin/sh scripts that need to test for the presence
* of bsdcpio can use the following template:
*
* if (cpio --help 2>&1 | grep bsdcpio >/dev/null 2>&1 ) then \
* echo bsdcpio; else echo not bsdcpio; fi
*/
static void
long_help(void)
{
const char *prog;
const char *p;
prog = cpio_progname;
fflush(stderr);
p = (strcmp(prog,"bsdcpio") != 0) ? "(bsdcpio)" : "";
printf("%s%s: manipulate archive files\n", prog, p);
for (p = long_help_msg; *p != '\0'; p++) {
if (*p == '%') {
if (p[1] == 'p') {
fputs(prog, stdout);
p++;
} else
putchar('%');
} else
putchar(*p);
}
version();
}
static void
version(void)
{
fprintf(stdout,"bsdcpio %s -- %s\n",
BSDCPIO_VERSION_STRING,
archive_version());
exit(0);
}
static void
mode_out(struct cpio *cpio)
{
unsigned long blocks;
struct archive_entry *entry, *spare;
struct line_reader *lr;
const char *p;
int r;
if (cpio->option_append)
cpio_errc(1, 0, "Append mode not yet supported.");
cpio->archive = archive_write_new();
if (cpio->archive == NULL)
cpio_errc(1, 0, "Failed to allocate archive object");
switch (cpio->compress) {
case 'j': case 'y':
archive_write_set_compression_bzip2(cpio->archive);
break;
case 'z':
archive_write_set_compression_gzip(cpio->archive);
break;
case 'Z':
archive_write_set_compression_compress(cpio->archive);
break;
default:
archive_write_set_compression_none(cpio->archive);
break;
}
r = archive_write_set_format_by_name(cpio->archive, cpio->format);
if (r != ARCHIVE_OK)
cpio_errc(1, 0, archive_error_string(cpio->archive));
archive_write_set_bytes_per_block(cpio->archive, cpio->bytes_per_block);
cpio->linkresolver = archive_entry_linkresolver_new();
archive_entry_linkresolver_set_strategy(cpio->linkresolver,
archive_format(cpio->archive));
r = archive_write_open_file(cpio->archive, cpio->filename);
if (r != ARCHIVE_OK)
cpio_errc(1, 0, archive_error_string(cpio->archive));
lr = process_lines_init("-", cpio->line_separator);
while ((p = process_lines_next(lr)) != NULL)
file_to_archive(cpio, p);
process_lines_free(lr);
/*
* The hardlink detection may have queued up a couple of entries
* that can now be flushed.
*/
entry = NULL;
archive_entry_linkify(cpio->linkresolver, &entry, &spare);
while (entry != NULL) {
entry_to_archive(cpio, entry);
archive_entry_free(entry);
entry = NULL;
archive_entry_linkify(cpio->linkresolver, &entry, &spare);
}
r = archive_write_close(cpio->archive);
if (r != ARCHIVE_OK)
cpio_errc(1, 0, archive_error_string(cpio->archive));
if (!cpio->quiet) {
blocks = (archive_position_uncompressed(cpio->archive) + 511)
/ 512;
fprintf(stderr, "%lu %s\n", blocks,
blocks == 1 ? "block" : "blocks");
}
archive_write_finish(cpio->archive);
}
/*
* This is used by both out mode (to copy objects from disk into
* an archive) and pass mode (to copy objects from disk to
* an archive_write_disk "archive").
*/
static int
file_to_archive(struct cpio *cpio, const char *srcpath)
{
struct stat st;
const char *destpath;
struct archive_entry *entry, *spare;
size_t len;
const char *p;
int lnklen;
int r;
/*
* Create an archive_entry describing the source file.
*/
entry = archive_entry_new();
if (entry == NULL)
cpio_errc(1, 0, "Couldn't allocate entry");
archive_entry_copy_sourcepath(entry, srcpath);
/* Get stat information. */
if (cpio->option_follow_links)
r = stat(srcpath, &st);
else
r = lstat(srcpath, &st);
if (r != 0) {
cpio_warnc(errno, "Couldn't stat \"%s\"", srcpath);
archive_entry_free(entry);
return (0);
}
if (cpio->uid_override >= 0)
st.st_uid = cpio->uid_override;
if (cpio->gid_override >= 0)
st.st_gid = cpio->uid_override;
archive_entry_copy_stat(entry, &st);
/* If its a symlink, pull the target. */
if (S_ISLNK(st.st_mode)) {
lnklen = readlink(srcpath, cpio->buff, cpio->buff_size);
if (lnklen < 0) {
cpio_warnc(errno,
"%s: Couldn't read symbolic link", srcpath);
archive_entry_free(entry);
return (0);
}
cpio->buff[lnklen] = 0;
archive_entry_set_symlink(entry, cpio->buff);
}
/*
* Generate a destination path for this entry.
* "destination path" is the name to which it will be copied in
* pass mode or the name that will go into the archive in
* output mode.
*/
destpath = srcpath;
if (cpio->destdir) {
len = strlen(cpio->destdir) + strlen(srcpath) + 8;
if (len >= cpio->pass_destpath_alloc) {
while (len >= cpio->pass_destpath_alloc) {
cpio->pass_destpath_alloc += 512;
cpio->pass_destpath_alloc *= 2;
}
free(cpio->pass_destpath);
cpio->pass_destpath = malloc(cpio->pass_destpath_alloc);
if (cpio->pass_destpath == NULL)
cpio_errc(1, ENOMEM,
"Can't allocate path buffer");
}
strcpy(cpio->pass_destpath, cpio->destdir);
p = srcpath;
while (p[0] == '/')
++p;
strcat(cpio->pass_destpath, p);
destpath = cpio->pass_destpath;
}
if (cpio->option_rename)
destpath = cpio_rename(destpath);
if (destpath == NULL)
return (0);
archive_entry_copy_pathname(entry, destpath);
/*
* If we're trying to preserve hardlinks, match them here.
*/
spare = NULL;
if (cpio->linkresolver != NULL
&& !S_ISDIR(st.st_mode)) {
archive_entry_linkify(cpio->linkresolver, &entry, &spare);
}
if (entry != NULL) {
r = entry_to_archive(cpio, entry);
archive_entry_free(entry);
}
if (spare != NULL) {
if (r == 0)
r = entry_to_archive(cpio, spare);
archive_entry_free(spare);
}
return (r);
}
static int
entry_to_archive(struct cpio *cpio, struct archive_entry *entry)
{
const char *destpath = archive_entry_pathname(entry);
const char *srcpath = archive_entry_sourcepath(entry);
int fd = -1;
ssize_t bytes_read;
int r;
/* Print out the destination name to the user. */
if (cpio->verbose)
fprintf(stderr,"%s", destpath);
/*
* Option_link only makes sense in pass mode and for
* regular files. Also note: if a link operation fails
* because of cross-device restrictions, we'll fall back
* to copy mode for that entry.
*
* TODO: Test other cpio implementations to see if they
* hard-link anything other than regular files here.
*/
if (cpio->option_link
&& archive_entry_filetype(entry) == AE_IFREG)
{
struct archive_entry *t;
/* Save the original entry in case we need it later. */
t = archive_entry_clone(entry);
if (t == NULL)
cpio_errc(1, ENOMEM, "Can't create link");
/* Note: link(2) doesn't create parent directories,
* so we use archive_write_header() instead as a
* convenience. */
archive_entry_set_hardlink(t, srcpath);
/* This is a straight link that carries no data. */
archive_entry_set_size(t, 0);
r = archive_write_header(cpio->archive, t);
archive_entry_free(t);
if (r != ARCHIVE_OK)
cpio_warnc(archive_errno(cpio->archive),
archive_error_string(cpio->archive));
if (r == ARCHIVE_FATAL)
exit(1);
#ifdef EXDEV
if (r != ARCHIVE_OK && archive_errno(cpio->archive) == EXDEV) {
/* Cross-device link: Just fall through and use
* the original entry to copy the file over. */
cpio_warnc(0, "Copying file instead");
} else
#endif
return (0);
}
/*
* Make sure we can open the file (if necessary) before
* trying to write the header.
*/
if (archive_entry_filetype(entry) == AE_IFREG) {
if (archive_entry_size(entry) > 0) {
fd = open(srcpath, O_RDONLY);
if (fd < 0) {
cpio_warnc(errno,
"%s: could not open file", srcpath);
goto cleanup;
}
}
} else {
archive_entry_set_size(entry, 0);
}
r = archive_write_header(cpio->archive, entry);
if (r != ARCHIVE_OK)
cpio_warnc(archive_errno(cpio->archive),
"%s: %s",
destpath,
archive_error_string(cpio->archive));
if (r == ARCHIVE_FATAL)
exit(1);
if (r >= ARCHIVE_WARN && fd >= 0) {
bytes_read = read(fd, cpio->buff, cpio->buff_size);
while (bytes_read > 0) {
r = archive_write_data(cpio->archive,
cpio->buff, bytes_read);
if (r < 0)
cpio_errc(1, archive_errno(cpio->archive),
archive_error_string(cpio->archive));
if (r < bytes_read) {
cpio_warnc(0,
"Truncated write; file may have grown while being archived.");
}
bytes_read = read(fd, cpio->buff, cpio->buff_size);
}
}
restore_time(cpio, entry, srcpath, fd);
cleanup:
if (cpio->verbose)
fprintf(stderr,"\n");
if (fd >= 0)
close(fd);
return (0);
}
static void
restore_time(struct cpio *cpio, struct archive_entry *entry,
const char *name, int fd)
{
#ifndef HAVE_UTIMES
static int warned = 0;
(void)cpio; /* UNUSED */
(void)entry; /* UNUSED */
(void)name; /* UNUSED */
(void)fd; /* UNUSED */
if (!warned)
cpio_warnc(0, "Can't restore access times on this platform");
warned = 1;
return;
#else
struct timeval times[2];
if (!cpio->option_atime_restore)
return;
times[1].tv_sec = archive_entry_mtime(entry);
times[1].tv_usec = archive_entry_mtime_nsec(entry) / 1000;
times[0].tv_sec = archive_entry_atime(entry);
times[0].tv_usec = archive_entry_atime_nsec(entry) / 1000;
#ifdef HAVE_FUTIMES
if (fd >= 0 && futimes(fd, times) == 0)
return;
#endif
#ifdef HAVE_LUTIMES
if (lutimes(name, times) != 0)
#else
if (!S_ISLNK(archive_entry_mode(entry)) && utimes(name, times) != 0)
#endif
cpio_warnc(errno, "Can't update time for %s", name);
#endif
}
static void
mode_in(struct cpio *cpio)
{
struct archive *a;
struct archive_entry *entry;
struct archive *ext;
const char *destpath;
unsigned long blocks;
int r;
ext = archive_write_disk_new();
if (ext == NULL)
cpio_errc(1, 0, "Couldn't allocate restore object");
r = archive_write_disk_set_options(ext, cpio->extract_flags);
if (r != ARCHIVE_OK)
cpio_errc(1, 0, archive_error_string(ext));
a = archive_read_new();
if (a == NULL)
cpio_errc(1, 0, "Couldn't allocate archive object");
archive_read_support_compression_all(a);
archive_read_support_format_all(a);
if (archive_read_open_file(a, cpio->filename, cpio->bytes_per_block))
cpio_errc(1, archive_errno(a),
archive_error_string(a));
for (;;) {
r = archive_read_next_header(a, &entry);
if (r == ARCHIVE_EOF)
break;
if (r != ARCHIVE_OK) {
cpio_errc(1, archive_errno(a),
archive_error_string(a));
}
if (excluded(cpio, archive_entry_pathname(entry)))
continue;
if (cpio->option_rename) {
destpath = cpio_rename(archive_entry_pathname(entry));
archive_entry_set_pathname(entry, destpath);
} else
destpath = archive_entry_pathname(entry);
if (destpath == NULL)
continue;
if (cpio->verbose)
fprintf(stdout, "%s\n", destpath);
if (cpio->uid_override >= 0)
archive_entry_set_uid(entry, cpio->uid_override);
if (cpio->gid_override >= 0)
archive_entry_set_gid(entry, cpio->gid_override);
r = archive_write_header(ext, entry);
if (r != ARCHIVE_OK) {
fprintf(stderr, "%s: %s\n",
archive_entry_pathname(entry),
archive_error_string(ext));
} else if (archive_entry_size(entry) > 0) {
r = copy_data(a, ext);
}
}
r = archive_read_close(a);
if (r != ARCHIVE_OK)
cpio_errc(1, 0, archive_error_string(a));
r = archive_write_close(ext);
if (r != ARCHIVE_OK)
cpio_errc(1, 0, archive_error_string(ext));
if (!cpio->quiet) {
blocks = (archive_position_uncompressed(a) + 511)
/ 512;
fprintf(stderr, "%lu %s\n", blocks,
blocks == 1 ? "block" : "blocks");
}
archive_read_finish(a);
archive_write_finish(ext);
exit(0);
}
static int
copy_data(struct archive *ar, struct archive *aw)
{
int r;
size_t size;
const void *block;
off_t offset;
for (;;) {
r = archive_read_data_block(ar, &block, &size, &offset);
if (r == ARCHIVE_EOF)
return (ARCHIVE_OK);
if (r != ARCHIVE_OK) {
cpio_warnc(archive_errno(ar),
"%s", archive_error_string(ar));
return (r);
}
r = archive_write_data_block(aw, block, size, offset);
if (r != ARCHIVE_OK) {
cpio_warnc(archive_errno(aw),
archive_error_string(aw));
return (r);
}
}
}
static void
mode_list(struct cpio *cpio)
{
struct archive *a;
struct archive_entry *entry;
unsigned long blocks;
int r;
a = archive_read_new();
if (a == NULL)
cpio_errc(1, 0, "Couldn't allocate archive object");
archive_read_support_compression_all(a);
archive_read_support_format_all(a);
if (archive_read_open_file(a, cpio->filename, cpio->bytes_per_block))
cpio_errc(1, archive_errno(a),
archive_error_string(a));
for (;;) {
r = archive_read_next_header(a, &entry);
if (r == ARCHIVE_EOF)
break;
if (r != ARCHIVE_OK) {
cpio_errc(1, archive_errno(a),
archive_error_string(a));
}
if (excluded(cpio, archive_entry_pathname(entry)))
continue;
if (cpio->verbose) {
/* TODO: uname/gname lookups */
/* TODO: Clean this up. */
fprintf(stdout,
"%s%3d %8s%8s " CPIO_FILESIZE_PRINTF " %s\n",
archive_entry_strmode(entry),
archive_entry_nlink(entry),
archive_entry_uname(entry),
archive_entry_gname(entry),
(CPIO_FILESIZE_TYPE)archive_entry_size(entry),
archive_entry_pathname(entry));
} else
fprintf(stdout, "%s\n", archive_entry_pathname(entry));
}
r = archive_read_close(a);
if (r != ARCHIVE_OK)
cpio_errc(1, 0, archive_error_string(a));
if (!cpio->quiet) {
blocks = (archive_position_uncompressed(a) + 511)
/ 512;
fprintf(stderr, "%lu %s\n", blocks,
blocks == 1 ? "block" : "blocks");
}
archive_read_finish(a);
exit(0);
}
static void
mode_pass(struct cpio *cpio, const char *destdir)
{
struct line_reader *lr;
const char *p;
int r;
/* Ensure target dir has a trailing '/' to simplify path surgery. */
cpio->destdir = malloc(strlen(destdir) + 8);
strcpy(cpio->destdir, destdir);
if (destdir[strlen(destdir) - 1] != '/')
strcat(cpio->destdir, "/");
cpio->archive = archive_write_disk_new();
if (cpio->archive == NULL)
cpio_errc(1, 0, "Failed to allocate archive object");
r = archive_write_disk_set_options(cpio->archive, cpio->extract_flags);
if (r != ARCHIVE_OK)
cpio_errc(1, 0, archive_error_string(cpio->archive));
cpio->linkresolver = archive_entry_linkresolver_new();
archive_write_disk_set_standard_lookup(cpio->archive);
lr = process_lines_init("-", cpio->line_separator);
while ((p = process_lines_next(lr)) != NULL)
file_to_archive(cpio, p);
process_lines_free(lr);
archive_entry_linkresolver_free(cpio->linkresolver);
r = archive_write_close(cpio->archive);
if (r != ARCHIVE_OK)
cpio_errc(1, 0, archive_error_string(cpio->archive));
archive_write_finish(cpio->archive);
}
/*
* Prompt for a new name for this entry. Returns a pointer to the
* new name or NULL if the entry should not be copied. This
* implements the semantics defined in POSIX.1-1996, which specifies
* that an input of '.' means the name should be unchanged. GNU cpio
* treats '.' as a literal new name.
*/
static const char *
cpio_rename(const char *name)
{
static char buff[1024];
FILE *t;
char *p, *ret;
t = fopen("/dev/tty", "r+");
if (t == NULL)
return (name);
fprintf(t, "%s (Enter/./(new name))? ", name);
fflush(t);
p = fgets(buff, sizeof(buff), t);
fclose(t);
if (p == NULL)
/* End-of-file is a blank line. */
return (NULL);
while (*p == ' ' || *p == '\t')
++p;
if (*p == '\n' || *p == '\0')
/* Empty line. */
return (NULL);
if (*p == '.' && p[1] == '\n')
/* Single period preserves original name. */
return (name);
ret = p;
/* Trim the final newline. */
while (*p != '\0' && *p != '\n')
++p;
/* Overwrite the final \n with a null character. */
*p = '\0';
return (ret);
}
/*
* Read lines from file and do something with each one. If option_null
* is set, lines are terminated with zero bytes; otherwise, they're
* terminated with newlines.
*
* This uses a self-sizing buffer to handle arbitrarily-long lines.
*/
struct line_reader {
FILE *f;
char *buff, *buff_end, *line_start, *line_end, *p;
char *pathname;
size_t buff_length;
int separator;
int ret;
};
struct line_reader *
process_lines_init(const char *pathname, char separator)
{
struct line_reader *lr;
lr = calloc(1, sizeof(*lr));
if (lr == NULL)
cpio_errc(1, ENOMEM, "Can't open %s", pathname);
lr->separator = separator;
lr->pathname = strdup(pathname);
if (strcmp(pathname, "-") == 0)
lr->f = stdin;
else
lr->f = fopen(pathname, "r");
if (lr->f == NULL)
cpio_errc(1, errno, "Couldn't open %s", pathname);
lr->buff_length = 8192;
lr->buff = malloc(lr->buff_length);
if (lr->buff == NULL)
cpio_errc(1, ENOMEM, "Can't read %s", pathname);
lr->line_start = lr->line_end = lr->buff_end = lr->buff;
return (lr);
}
const char *
process_lines_next(struct line_reader *lr)
{
size_t bytes_wanted, bytes_read, new_buff_size;
char *line_start, *p;
for (;;) {
/* If there's a line in the buffer, return it immediately. */
while (lr->line_end < lr->buff_end) {
if (*lr->line_end == lr->separator) {
*lr->line_end = '\0';
line_start = lr->line_start;
lr->line_start = lr->line_end + 1;
lr->line_end = lr->line_start;
return (line_start);
} else
lr->line_end++;
}
/* If we're at end-of-file, process the final data. */
if (lr->f == NULL) {
/* If there's more text, return one last line. */
if (lr->line_end > lr->line_start) {
*lr->line_end = '\0';
line_start = lr->line_start;
lr->line_start = lr->line_end + 1;
lr->line_end = lr->line_start;
return (line_start);
}
/* Otherwise, we're done. */
return (NULL);
}
/* Buffer only has part of a line. */
if (lr->line_start > lr->buff) {
/* Move a leftover fractional line to the beginning. */
memmove(lr->buff, lr->line_start,
lr->buff_end - lr->line_start);
lr->buff_end -= lr->line_start - lr->buff;
lr->line_end -= lr->line_start - lr->buff;
lr->line_start = lr->buff;
} else {
/* Line is too big; enlarge the buffer. */
new_buff_size = lr->buff_length * 2;
if (new_buff_size <= lr->buff_length)
cpio_errc(1, ENOMEM,
"Line too long in %s", lr->pathname);
lr->buff_length = new_buff_size;
p = realloc(lr->buff, new_buff_size);
if (p == NULL)
cpio_errc(1, ENOMEM,
"Line too long in %s", lr->pathname);
lr->buff_end = p + (lr->buff_end - lr->buff);
lr->line_end = p + (lr->line_end - lr->buff);
lr->line_start = lr->buff = p;
}
/* Get some more data into the buffer. */
bytes_wanted = lr->buff + lr->buff_length - lr->buff_end;
bytes_read = fread(lr->buff_end, 1, bytes_wanted, lr->f);
lr->buff_end += bytes_read;
if (ferror(lr->f))
cpio_errc(1, errno, "Can't read %s", lr->pathname);
if (feof(lr->f)) {
if (lr->f != stdin)
fclose(lr->f);
lr->f = NULL;
}
}
}
void
process_lines_free(struct line_reader *lr)
{
free(lr->buff);
free(lr->pathname);
free(lr);
}
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