d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
ee6b783c62
freebsd-skq/usr.bin/tar/write.c

1392 lines
36 KiB
C
Raw Blame History

/*-
* Copyright (c) 2003-2004 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 "bsdtar_platform.h"
__FBSDID("$FreeBSD$");
#include <sys/stat.h>
#include <sys/types.h>
#ifdef HAVE_POSIX_ACL
#include <sys/acl.h>
#endif
#include <archive.h>
#include <archive_entry.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <fts.h>
#include <grp.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef LINUX
#include <ext2fs/ext2_fs.h>
#include <sys/ioctl.h>
#endif
#include "bsdtar.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;
char stop_allocating;
};
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 *,
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 void create_cleanup(struct bsdtar *);
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,
time_t mtime_sec, int mtime_nsec);
static void setup_acls(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 *,
struct stat *, const char *pathname,
unsigned pathlen, const char *accpath);
static int write_file_data(struct bsdtar *, struct archive *,
int fd);
static void write_heirarchy(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)
archive_write_set_format_pax_restricted(a);
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);
switch (bsdtar->create_compression) {
case 0:
break;
case 'j': case 'y':
archive_write_set_compression_bzip2(a);
break;
case 'z':
archive_write_set_compression_gzip(a);
break;
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);
archive_write_finish(a);
}
/*
* Same as 'c', except we only support tar 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;
/* Sanity-test some arguments and the file. */
test_for_append(bsdtar);
format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;
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);
archive_read_open_fd(a, bsdtar->fd, 10240);
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 format to same one auto-detected above, except use
* ustar for appending to GNU tar, since the library doesn't
* write GNU tar format.
*/
if (format == ARCHIVE_FORMAT_TAR_GNUTAR)
format = ARCHIVE_FORMAT_TAR_USTAR;
archive_write_set_format(a, format);
lseek(bsdtar->fd, end_offset, SEEK_SET);
archive_write_open_fd(a, bsdtar->fd);
write_archive(a, bsdtar);
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;
const char *filename;
int format;
struct archive_dir_entry *p;
struct archive_dir archive_dir;
bsdtar->archive_dir = &archive_dir;
memset(&archive_dir, 0, sizeof(archive_dir));
filename = NULL;
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);
archive_read_open_fd(a, bsdtar->fd,
bsdtar->bytes_per_block != 0 ? bsdtar->bytes_per_block :
DEFAULT_BYTES_PER_BLOCK);
/* 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);
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;
char *pending_dir;
pending_dir = NULL;
if (bsdtar->start_dir != NULL && chdir(bsdtar->start_dir)) {
bsdtar_warnc(bsdtar, errno,
"chdir(%s) failed", bsdtar->start_dir);
bsdtar->return_value = 1;
return;
}
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;
}
}
/*-
* The logic here for -C <dir> attempts to avoid
* chdir() as long as possible. For example:
* "-C /foo -C /bar file"
* needs chdir("/bar") but not chdir("/foo")
* "-C /foo -C bar file"
* needs chdir("/foo/bar")
* "-C /foo -C bar /file1"
* does not need chdir()
* "-C /foo -C bar /file1 file2"
* needs chdir("/foo/bar") before file2
*
* The only correct way to handle this is to
* record a "pending" chdir request and only
* execute the real chdir when a non-absolute
* filename is seen on the command line.
*
* I went to all this work so that programs
* that build tar command lines don't have to
* worry about -C with non-existent
* directories; such requests will only fail
* if the directory must be accessed.
*/
if (pending_dir && *arg == '/') {
/* The -C /foo -C /bar case; dump first one. */
free(pending_dir);
pending_dir = NULL;
}
if (pending_dir) {
/* The -C /foo -C bar case; concatenate */
char *old_pending = pending_dir;
int old_len = strlen(old_pending);
pending_dir =
malloc(old_len + 1 + strlen(arg));
strcpy(pending_dir, old_pending);
if (pending_dir[old_len - 1] != '/') {
pending_dir[old_len] = '/';
old_len ++;
}
strcpy(pending_dir + old_len, arg);
} else {
/* Easy case: no previously-saved dir. */
pending_dir = strdup(arg);
}
} else {
if (pending_dir &&
(*arg != '/' || (*arg == '@' && arg[1] != '/'))) {
/* Handle a deferred -C */
if (chdir(pending_dir)) {
bsdtar_warnc(bsdtar, 0,
"could not chdir to '%s'\n",
pending_dir);
bsdtar->return_value = 1;
return;
}
free(pending_dir);
pending_dir = NULL;
}
if (*arg == '@') {
if (append_archive(bsdtar, a, arg+1))
break;
} else
write_heirarchy(bsdtar, a, arg);
}
bsdtar->argv++;
}
create_cleanup(bsdtar);
}
/*
* 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) {
if (chdir(line) != 0)
bsdtar_errc(bsdtar, 1, errno,
"chdir(%s) failed", line);
bsdtar->next_line_is_dir = 0;
} else if (!bsdtar->option_null && strcmp(line, "-C") == 0)
bsdtar->next_line_is_dir = 1;
else
write_heirarchy(bsdtar, bsdtar->archive, line);
return (0);
}
/*
* Copy from specified archive to current archive.
* Returns non-zero on fatal error (i.e., output errors). Errors
* reading the input archive set bsdtar->return_value, but this
* function will still return zero.
*/
static int
append_archive(struct bsdtar *bsdtar, struct archive *a, const char *filename)
{
struct archive *ina;
struct archive_entry *in_entry;
int bytes_read, bytes_written;
char buff[8192];
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);
}
while (0 == archive_read_next_header(ina, &in_entry)) {
if (!new_enough(bsdtar, archive_entry_pathname(in_entry),
archive_entry_mtime(in_entry),
archive_entry_mtime_nsec(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));
/* XXX handle/report errors XXX */
if (archive_write_header(a, in_entry)) {
bsdtar_warnc(bsdtar, 0, "%s",
archive_error_string(ina));
bsdtar->return_value = 1;
return (-1);
}
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, archive_errno(a), "%s",
archive_error_string(a));
return (-1);
}
bytes_read =
archive_read_data(ina, buff, sizeof(buff));
}
if (bsdtar->verbose)
fprintf(stderr, "\n");
}
if (archive_errno(ina)) {
bsdtar_warnc(bsdtar, 0, "Error reading archive %s: %s",
filename, archive_error_string(ina));
bsdtar->return_value = 1;
}
return (0); /* TODO: Return non-zero on error */
}
/*
* Add the file or dir heirarchy named by 'path' to the archive
*/
static void
write_heirarchy(struct bsdtar *bsdtar, struct archive *a, const char *path)
{
FTS *fts;
FTSENT *ftsent;
int ftsoptions;
char *fts_argv[2];
#ifdef LINUX
int fd, r;
unsigned long fflags;
#endif
/*
* Sigh: fts_open modifies it's first parameter, so we have to
* copy 'path' to mutable storage.
*/
fts_argv[0] = strdup(path);
fts_argv[1] = NULL;
ftsoptions = FTS_PHYSICAL;
switch (bsdtar->symlink_mode) {
case 'H':
ftsoptions |= FTS_COMFOLLOW;
break;
case 'L':
ftsoptions = FTS_COMFOLLOW | FTS_LOGICAL;
break;
}
if (bsdtar->option_dont_traverse_mounts)
ftsoptions |= FTS_XDEV;
fts = fts_open(fts_argv, ftsoptions, NULL);
if (!fts) {
bsdtar_warnc(bsdtar, errno, "%s: Cannot open", path);
bsdtar->return_value = 1;
return;
}
while ((ftsent = fts_read(fts))) {
switch (ftsent->fts_info) {
case FTS_NS:
bsdtar_warnc(bsdtar, ftsent->fts_errno,
"%s: Could not stat", ftsent->fts_path);
bsdtar->return_value = 1;
break;
case FTS_ERR:
bsdtar_warnc(bsdtar, ftsent->fts_errno, "%s",
ftsent->fts_path);
bsdtar->return_value = 1;
break;
case FTS_DNR:
bsdtar_warnc(bsdtar, ftsent->fts_errno,
"%s: Cannot read directory contents",
ftsent->fts_path);
bsdtar->return_value = 1;
break;
case FTS_W: /* Skip Whiteout entries */
break;
case FTS_DC: /* Directory that causes cycle */
/* XXX Does this need special handling ? */
break;
case FTS_D:
/*
* If this dir is flagged "nodump" and we're
* honoring such flags, tell FTS to skip the
* entire tree and don't write the entry for the
* directory itself.
*/
#ifdef HAVE_CHFLAGS
if (bsdtar->option_honor_nodump &&
(ftsent->fts_statp->st_flags & UF_NODUMP)) {
fts_set(fts, ftsent, FTS_SKIP);
break;
}
#endif
#ifdef LINUX
/*
* Linux has a nodump flag too but to read it
* we have to open() the dir and do an ioctl on it...
*/
if (bsdtar->option_honor_nodump &&
((fd = open(ftsent->fts_name, O_RDONLY|O_NONBLOCK)) >= 0) &&
((r = ioctl(fd, EXT2_IOC_GETFLAGS, &fflags)),
close(fd), r) >= 0 &&
(fflags & EXT2_NODUMP_FL)) {
fts_set(fts, ftsent, FTS_SKIP);
break;
}
#endif
/*
* In -u mode, we need to check whether this
* is newer than what's already in the archive.
*/
if (!new_enough(bsdtar, ftsent->fts_path,
ftsent->fts_statp->st_mtime,
ARCHIVE_STAT_MTIME_NANOS(ftsent->fts_statp)))
break;
/*
* If this dir is excluded by a filename
* pattern, tell FTS to skip the entire tree
* and don't write the entry for the directory
* itself.
*/
if (excluded(bsdtar, ftsent->fts_path)) {
fts_set(fts, ftsent, FTS_SKIP);
break;
}
/*
* If the user vetoes the directory, skip
* the whole thing.
*/
if (bsdtar->option_interactive &&
!yes("add '%s'", ftsent->fts_path)) {
fts_set(fts, ftsent, FTS_SKIP);
break;
}
/*
* If we're not recursing, tell FTS to skip the
* tree but do fall through and write the entry
* for the dir itself.
*/
if (bsdtar->option_no_subdirs)
fts_set(fts, ftsent, FTS_SKIP);
write_entry(bsdtar, a, ftsent->fts_statp,
ftsent->fts_path, ftsent->fts_pathlen,
ftsent->fts_accpath);
break;
case FTS_F:
case FTS_SL:
case FTS_SLNONE:
case FTS_DEFAULT:
/*
* Skip this file if it's flagged "nodump" and we're
* honoring that flag.
*/
#ifdef HAVE_CHFLAGS
if (bsdtar->option_honor_nodump &&
(ftsent->fts_statp->st_flags & UF_NODUMP))
break;
#endif
#ifdef LINUX
/*
* Linux has a nodump flag too but to read it
* we have to open() the file and do an ioctl on it...
*/
if (bsdtar->option_honor_nodump &&
S_ISREG(ftsent->fts_statp->st_mode) &&
((fd = open(ftsent->fts_name, O_RDONLY|O_NONBLOCK)) >= 0) &&
((r = ioctl(fd, EXT2_IOC_GETFLAGS, &fflags)),
close(fd), r) >= 0 &&
(fflags & EXT2_NODUMP_FL))
break;
#endif
/*
* Skip this file if it's excluded by a
* filename pattern.
*/
if (excluded(bsdtar, ftsent->fts_path))
break;
/*
* In -u mode, we need to check whether this
* is newer than what's already in the archive.
*/
if (!new_enough(bsdtar, ftsent->fts_path,
ftsent->fts_statp->st_mtime,
ARCHIVE_STAT_MTIME_NANOS(ftsent->fts_statp)))
break;
if (bsdtar->option_interactive &&
!yes("add '%s'", ftsent->fts_path)) {
break;
}
write_entry(bsdtar, a, ftsent->fts_statp,
ftsent->fts_path, ftsent->fts_pathlen,
ftsent->fts_accpath);
break;
case FTS_DP:
break;
default:
bsdtar_warnc(bsdtar, 0,
"%s: Heirarchy traversal error %d\n",
ftsent->fts_path,
ftsent->fts_info);
break;
}
}
if (errno)
bsdtar_warnc(bsdtar, errno, "%s", path);
if (fts_close(fts))
bsdtar_warnc(bsdtar, errno, "fts_close failed");
free(fts_argv[0]);
}
/*
* Add a single filesystem object to the archive.
*/
static void
write_entry(struct bsdtar *bsdtar, struct archive *a, struct stat *st,
const char *pathname, unsigned pathlen, 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];
(void)pathlen; /* UNUSED */
fd = -1;
entry = archive_entry_new();
/* Non-regular files get archived with zero size. */
if (!S_ISREG(st->st_mode))
st->st_size = 0;
/* Strip redundant "./" from start of filename. */
if (pathname && pathname[0] == '.' && pathname[1] == '/') {
pathname += 2;
if (*pathname == 0) /* This is the "./" directory. */
goto cleanup; /* Don't archive it ever. */
}
/* Strip leading '/' unless user has asked us not to. */
if (pathname && pathname[0] == '/' && !bsdtar->option_absolute_paths) {
/* Generate a warning the first time this happens. */
if (!bsdtar->warned_lead_slash) {
bsdtar_warnc(bsdtar, 0,
"Removing leading '/' from member names");
bsdtar->warned_lead_slash = 1;
}
pathname++;
}
archive_entry_set_pathname(entry, pathname);
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", pathname);
/* 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), r) >= 0 &&
stflags) {
archive_entry_set_fflags(entry, stflags, 0);
}
#endif
archive_entry_copy_stat(entry, st);
setup_acls(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", pathname);
else
fprintf(stderr, ": %s", strerror(errno));
goto cleanup;
}
}
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 (fd >= 0 && archive_entry_size(entry) > 0)
write_file_data(bsdtar, a, fd);
cleanup:
if (fd >= 0)
close(fd);
if (entry != NULL)
archive_entry_free(entry);
if (bsdtar->verbose)
fprintf(stderr, "\n");
}
/* 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 */
(void)bsdtar;
bytes_read = read(fd, buff, sizeof(buff));
while (bytes_read > 0) {
bytes_written = archive_write_data(a, buff, bytes_read);
if (bytes_written == 0 && errno) {
return -1; /* Write failed; this is bad */
}
bytes_read = read(fd, buff, sizeof(buff));
}
return 0;
}
static void
create_cleanup(struct bsdtar * bsdtar)
{
struct links_cache *links_cache;
size_t i;
/* Free inode->pathname map used for hardlink detection. */
if (bsdtar->links_cache != NULL) {
links_cache = bsdtar->links_cache;
if (links_cache->buckets != NULL) {
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);
}
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
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 is getting too full, enlarge the hash table. */
if (links_cache->number_entries > links_cache->number_buckets * 2 &&
!links_cache->stop_allocating)
{
int count;
new_size = links_cache->number_buckets * 2;
new_buckets = malloc(new_size * sizeof(struct links_entry *));
count = 0;
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 {
links_cache->stop_allocating = 1;
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;
}
}
if (links_cache->stop_allocating)
return;
/* Add this entry to the links cache. */
le = malloc(sizeof(struct links_entry));
if (le == NULL) {
links_cache->stop_allocating = 1;
bsdtar_warnc(bsdtar, ENOMEM,
"No more memory for recording hard links");
bsdtar_warnc(bsdtar, 0,
"Remaining hard links will be dumped as full files");
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;
le->name = strdup(archive_entry_pathname(entry));
}
#ifdef HAVE_POSIX_ACL
void setup_acl(struct bsdtar *bsdtar,
struct archive_entry *entry, const char *accpath,
int acl_type, int archive_entry_acl_type);
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);
}
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;
if (acl_get_perm_np(acl_permset, ACL_EXECUTE))
ae_perm |= ARCHIVE_ENTRY_ACL_EXECUTE;
if (acl_get_perm_np(acl_permset, ACL_READ))
ae_perm |= ARCHIVE_ENTRY_ACL_READ;
if (acl_get_perm_np(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
void
setup_acls(struct bsdtar *bsdtar, struct archive_entry *entry,
const char *accpath)
{
(void)bsdtar;
(void)entry;
(void)accpath;
}
#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));
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);
cache->cache[slot].id = id;
return (cache->cache[slot].name);
}
}
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 newer than what's already
* in the archive.
*/
int
new_enough(struct bsdtar *bsdtar, const char *path,
time_t mtime_sec, int mtime_nsec)
{
struct archive_dir_entry *p;
if (path[0] == '.' && path[1] == '/' && path[2] != '\0')
path += 2;
if (bsdtar->archive_dir == NULL ||
bsdtar->archive_dir->head == NULL)
return (1);
for (p = bsdtar->archive_dir->head; p != NULL; p = p->next) {
if (strcmp(path, p->name)==0)
return (p->mtime_sec < mtime_sec ||
(p->mtime_sec == mtime_sec &&
p->mtime_nsec < mtime_nsec));
}
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;
if (path[0] == '.' && path[1] == '/' && path[2] != '\0')
path += 2;
/*
* 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));
p->name = strdup(path);
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)
bsdtar_errc(bsdtar, 1, errno,
"Cannot stat %s", bsdtar->filename);
if (!S_ISREG(s.st_mode))
bsdtar_errc(bsdtar, 1, 0,
"Cannot append to %s: not a regular file.",
bsdtar->filename);
}
Reference in New Issue View Git Blame Copy Permalink