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archivemount.c
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archivemount.c
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/*
Copyright (c) 2005-2018 Andre Landwehr <[email protected]>
This program can be distributed under the terms of the GNU LGPL.
See the file COPYING.
Based on: fusexmp.c and sshfs.c by Miklos Szeredi <[email protected]>
Contributions by: Niels de Vos <[email protected]>
Thomas J. Duck
Andrew Brampton <me at bramp dot net>
Tomáš Čech <sleep_walker at suse dot cz>
Timothy Hobbs <timothyhobbs at seznam dot cz>
Lee Leahu
Alain Parmentier <pa at infodata.lu>
*/
#ifdef linux
/* For pread()/pwrite() */
#define _XOPEN_SOURCE 500
#endif
#define FUSE_USE_VERSION 26
#define MAXBUF 4096
#define BLOCK_SIZE 10240
#include "config.h"
#include <fuse.h>
#include <fuse/fuse_lowlevel.h>
#include <fuse_opt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>
#include <sys/statvfs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <grp.h>
#include <pwd.h>
#include <utime.h>
#include <string.h>
#include <wchar.h>
#include <archive.h>
#include <archive_entry.h>
#include <pthread.h>
#include <regex.h>
#include <termios.h>
#include "archivecomp.h"
#include "uthash.h"
/**********/
/* macros */
/**********/
#ifdef NDEBUG
# define log(format, ...)
#else
# define log(format, ...) \
{ \
FILE *FH = fopen("/tmp/archivemount.log", "a"); \
if (FH) { \
fprintf(FH, "l. %4d: " format "\n", __LINE__, ##__VA_ARGS__); \
fclose(FH); \
} \
}
#endif
/*******************/
/* data structures */
/*******************/
typedef struct node {
struct node *parent;
struct node *child; /* first child for directories */
char *name; /* fully qualified with prepended '/' */
char *basename; /* every after the last '/' */
char *location; /* location on disk for new/modified files, else NULL */
int namechanged; /* true when file was renamed */
struct archive_entry *entry; /* libarchive header data */
int modified; /* true when node was modified */
UT_hash_handle hh;
} NODE;
struct options {
int readonly;
int password;
int nobackup;
int nosave;
char *subtree_filter;
int formatraw;
};
typedef struct formatraw_cache {
struct stat st;
struct archive *archive;
int opened;
off_t offset_uncompressed;
} FORMATRAW_CACHE;
enum {
KEY_VERSION,
KEY_HELP,
};
#define AR_OPT(t, p, v) { t, offsetof(struct options, p), v }
static struct fuse_opt ar_opts[] =
{
AR_OPT("readonly", readonly, 1),
AR_OPT("password", password, 1),
AR_OPT("nobackup", nobackup, 1),
AR_OPT("nosave" , nosave , 1),
AR_OPT("subtree=%s", subtree_filter, 1),
AR_OPT("formatraw", formatraw, 1),
FUSE_OPT_KEY("-V", KEY_VERSION),
FUSE_OPT_KEY("--version", KEY_VERSION),
FUSE_OPT_KEY("-h", KEY_HELP),
FUSE_OPT_KEY("--help", KEY_HELP),
FUSE_OPT_END
};
/***********/
/* globals */
/***********/
static int archiveFd; /* file descriptor of archive file, just to keep the
beast alive in case somebody deletes the file while
it is mounted */
static int archiveModified = 0;
static int archiveWriteable = 0;
static NODE *root;
static FORMATRAW_CACHE *rawcache;
struct options options;
char *mtpt = NULL;
char *archiveFile = NULL;
char *user_passphrase = NULL;
size_t user_passphrase_size = 0;
pthread_mutex_t lock; /* global node tree lock */
/* Taken from the GNU under the GPL */
char *
strchrnul (const char *s, int c_in)
{
char c = c_in;
while (*s && (*s != c))
s++;
return (char *) s;
}
/**********************/
/* internal functions */
/**********************/
static void
usage(const char *progname)
{
fprintf(stderr,
"usage: %s archivepath mountpoint [options]\n"
"\n"
"general options:\n"
" -o opt,[opt...] mount options\n"
" -h --help print help\n"
" -V --version print version\n"
"\n"
"archivemount options:\n"
" -o readonly disable write support\n"
" -o password prompt for a password.\n"
" -o nobackup remove archive file backups\n"
" -o nosave do not save changes upon unmount.\n"
" Good if you want to change something\n"
" and save it as a diff,\n"
" or use a format for saving which is\n"
" not supported by archivemount.\n"
"\n"
" -o subtree=<regexp> use only subtree matching ^\\.\\?<regexp> from archive\n"
" it implies readonly\n"
"\n"
" -o formatraw treat input as a single element archive\n"
" it implies readonly\n"
"\n",progname);
}
static struct fuse_operations ar_oper;
static int
ar_opt_proc(void *data, const char *arg, int key, struct fuse_args *outargs)
{
(void) data;
switch(key) {
case FUSE_OPT_KEY_OPT:
return 1;
case FUSE_OPT_KEY_NONOPT:
if (!archiveFile) {
archiveFile = strdup(arg);
return 0;
} else if (!mtpt) {
mtpt = strdup(arg);
}
return 1;
case KEY_HELP:
usage(outargs->argv[0]);
fuse_opt_add_arg(outargs, "-ho");
fuse_main(outargs->argc, outargs->argv, &ar_oper, NULL);
exit(1);
case KEY_VERSION:
fprintf(stderr, "archivemount version %s\n", VERSION);
fuse_opt_add_arg(outargs, "--version");
fuse_main(outargs->argc, outargs->argv, &ar_oper, NULL);
exit(0);
default:
fprintf(stderr, "internal error\n");
abort();
}
}
static NODE *
init_node()
{
NODE *node;
if ((node = malloc(sizeof(NODE))) == NULL) {
log("Out of memory");
return NULL;
}
node->parent = NULL;
node->child = NULL;
node->name = NULL;
node->basename = NULL;
node->location = NULL;
node->namechanged = 0;
node->entry = archive_entry_new();
node->modified = 0;
memset(&node->hh, 0, sizeof(node->hh));
if (node->entry == NULL) {
log("Out of memory");
free(node);
return NULL;
}
return node;
}
static FORMATRAW_CACHE *
init_rawcache()
{
FORMATRAW_CACHE *rawcache;
if ((rawcache = malloc(sizeof(FORMATRAW_CACHE))) == NULL) {
log("Out of memory");
return NULL;
}
memset(&rawcache->st, 0, sizeof(rawcache->st));
memset(&rawcache->archive, 0, sizeof(rawcache->archive));
rawcache->opened=0;
rawcache->offset_uncompressed=0;
return rawcache;
}
static void
free_node(NODE *node)
{
NODE *child, *tmp;
free(node->name);
archive_entry_free(node->entry);
// Clean up any children
HASH_ITER(hh, node->child, child, tmp) {
HASH_DEL(node->child, child);
free_node(child);
}
free(node);
}
/* not used now
#static void
free_rawcache(FORMATRAW_CACHE *rawcache)
{
free(rawcache);
}
*/
static void
remove_child(NODE *node)
{
if (node->parent) {
HASH_DEL(node->parent->child, node);
log("removed '%s' from parent '%s' (was first child)", node->name, node->parent->name);
} else {
root = NULL;
}
}
static void
insert_as_child(NODE *node, NODE *parent)
{
node->parent = parent;
HASH_ADD_KEYPTR(hh, parent->child, node->basename, strlen(node->basename), node);
log("inserted '%s' as child of '%s'", node->name, parent->name);
}
/*
* inserts "node" into tree starting at "root" according to the path
* specified in node->name
* @return 0 on success, 0-errno else (ENOENT or ENOTDIR)
*/
static int
insert_by_path(NODE *root, NODE *node)
{
char *temp;
NODE *cur = root;
char *key = node->name;
key++;
while ((temp = strchr(key, '/'))) {
size_t namlen = temp - key;
char nam[namlen + 1];
NODE *last = cur;
strncpy(nam, key, namlen);
nam[namlen] = '\0';
if (cur != root || strcmp(cur->basename, nam) != 0) {
cur = cur->child;
while (cur && strcmp(cur->basename, nam) != 0)
{
cur = cur->hh.next;
}
}
if (! cur) {
/* parent path not found, create a temporary one */
NODE *tempnode;
if ((tempnode = init_node()) == NULL)
return -ENOMEM;
if ((tempnode->name = malloc(
strlen(last->name) + namlen + 2)) == NULL) {
log("Out of memory");
return -ENOMEM;
}
if (last != root) {
sprintf(tempnode->name, "%s/%s", last->name, nam);
} else {
sprintf(tempnode->name, "/%s", nam);
}
tempnode->basename = strrchr(tempnode->name, '/') + 1;
archive_entry_free(tempnode->entry);
if ((tempnode->entry = archive_entry_clone(root->entry)) == NULL) {
log("Out of memory");
return -ENOMEM;
}
/* insert it recursively */
insert_by_path(root, tempnode);
/* now inserting node should work, correct cur for it */
cur = tempnode;
}
/* iterate */
key = temp + 1;
}
if (S_ISDIR(archive_entry_mode(cur->entry))) {
/* check if a child of this name already exists */
NODE *tempnode = NULL;
HASH_FIND(hh, cur->child, node->basename, strlen(node->basename), tempnode);
if (tempnode) {
/* this is a dupe due to a temporarily inserted
node, just update the entry */
archive_entry_free(node->entry);
if ((node->entry = archive_entry_clone(
tempnode->entry)) == NULL) {
log("Out of memory");
return -ENOMEM;
}
} else {
insert_as_child(node, cur);
}
} else {
return -ENOTDIR;
}
return 0;
}
static int
build_tree(const char *mtpt)
{
struct archive *archive;
struct stat st;
int format;
int compression;
NODE *cur;
char *subtree_filter = NULL;
regex_t subtree;
int regex_error;
regmatch_t regmatch;
char error_buffer[256];
#define PREFIX "^\\.\\?"
if (options.subtree_filter) {
subtree_filter = malloc(strlen(options.subtree_filter) + strlen(PREFIX) + 1);
if (!subtree_filter) {
log("Not enough memory");
return -ENOMEM;
}
strcpy(subtree_filter, PREFIX);
subtree_filter = strcat(subtree_filter, options.subtree_filter);
/* \? is only a special char on Mac if REG_ENHANCED is specified */
#if defined REG_ENHANCED
regex_error = regcomp(&subtree, subtree_filter, REG_ENHANCED);
#else
regex_error = regcomp(&subtree, subtree_filter, 0);
#endif
if (regex_error) {
regerror(regex_error, &subtree, error_buffer, 256);
log("Regex build error: %s\n", error_buffer);
return -regex_error;
}
options.readonly = 1;
}
/* open archive */
if ((archive = archive_read_new()) == NULL) {
log("Out of memory");
return -ENOMEM;
}
if (archive_read_support_filter_all(archive) != ARCHIVE_OK) {
fprintf(stderr, "%s\n", archive_error_string(archive));
return archive_errno(archive);
}
if (options.formatraw) {
if (archive_read_support_format_raw(archive) != ARCHIVE_OK) {
fprintf(stderr, "%s\n", archive_error_string(archive));
return archive_errno(archive);
}
options.readonly = 1;
} else {
if (archive_read_support_format_all(archive) != ARCHIVE_OK) {
fprintf(stderr, "%s\n", archive_error_string(archive));
return archive_errno(archive);
}
}
if (options.password) {
if (archive_read_add_passphrase(archive, user_passphrase) != ARCHIVE_OK) {
fprintf(stderr, "%s\n", archive_error_string(archive));
return archive_errno(archive);
}
}
if (archive_read_open_fd(archive, archiveFd, BLOCK_SIZE) != ARCHIVE_OK) {
fprintf(stderr, "%s\n", archive_error_string(archive));
return archive_errno(archive);
}
/* check if format or compression prohibits writability */
format = archive_format(archive);
log("mounted archive format is %s (0x%x)",
archive_format_name(archive), format);
compression = archive_filter_code(archive, 0);
log("mounted archive compression is %s (0x%x)",
archive_filter_name(archive, 0), compression);
if (format & ARCHIVE_FORMAT_ISO9660
|| format & ARCHIVE_FORMAT_ISO9660_ROCKRIDGE
|| format & ARCHIVE_FORMAT_ZIP
|| compression == ARCHIVE_COMPRESSION_COMPRESS)
{
archiveWriteable = 0;
}
/* create root node */
if ((root = init_node()) == NULL)
return -ENOMEM;
root->name = strdup("/");
root->basename = &root->name[1];
/* fill root->entry */
if (fstat(archiveFd, &st) != 0) {
perror("Error stat'ing archiveFile");
return errno;
}
archive_entry_set_gid(root->entry, getgid());
archive_entry_set_uid(root->entry, getuid());
archive_entry_set_mode(root->entry, st.st_mtime);
archive_entry_set_pathname(root->entry, "/");
archive_entry_set_size(root->entry, st.st_size);
stat(mtpt, &st);
archive_entry_set_mode(root->entry, st.st_mode);
if ((cur = init_node()) == NULL) {
return -ENOMEM;
}
/* read all entries in archive, create node for each */
while (archive_read_next_header2(archive, cur->entry) == ARCHIVE_OK) {
const char *name;
/* find name of node */
name = archive_entry_pathname(cur->entry);
if (memcmp(name, "./\0", 3) == 0) {
/* special case: the directory "./" must be skipped! */
continue;
}
if (options.subtree_filter) {
regex_error = regexec(&subtree, name, 1, ®match, REG_NOTEOL);
if (regex_error) {
if (regex_error == REG_NOMATCH)
continue;
regerror(regex_error, &subtree, error_buffer, 256);
log("Regex match error: %s\n", error_buffer);
return -regex_error;
}
/* strip subtree from name */
name += regmatch.rm_eo;
}
/* create node and clone the entry */
/* normalize the name to start with "/" */
if (strncmp(name, "./", 2) == 0) {
/* remove the "." of "./" */
cur->name = strdup(name + 1);
} else if (name[0] != '/') {
/* prepend a '/' to name */
if ((cur->name = malloc(strlen(name) + 2)) == NULL) {
log("Out of memory");
return -ENOMEM;
}
sprintf(cur->name, "/%s", name);
} else {
/* just set the name */
cur->name = strdup(name);
}
int len = strlen(cur->name) - 1;
if (0 < len) {
/* remove trailing '/' for directories */
if (cur->name[len] == '/') {
cur->name[len] = '\0';
}
cur->basename = strrchr(cur->name, '/') + 1;
/* references */
if (insert_by_path(root, cur) != 0) {
log("ERROR: could not insert %s into tree",
cur->name);
return -ENOENT;
}
} else {
/* this is the directory the subtree filter matches,
do not respect it */
}
if ((cur = init_node()) == NULL) {
return -ENOMEM;
}
archive_read_data_skip(archive);
}
/* free the last unused NODE */
free_node(cur);
/* close archive */
archive_read_free(archive);
lseek(archiveFd, 0, SEEK_SET);
if (options.subtree_filter) {
regfree(&subtree);
free(subtree_filter);
}
return 0;
}
static NODE *
find_modified_node(NODE *start)
{
NODE *ret = NULL;
NODE *run = start;
while (run) {
if (run->modified) {
ret = run;
break;
}
if (run->child) {
if ((ret = find_modified_node(run->child))) {
break;
}
}
run = run->hh.next;
}
return ret;
}
static void
correct_hardlinks_to_node(const NODE *start, const char *old_name,
const char *new_name)
{
const NODE *run = start;
while (run) {
const char *tmp;
if ((tmp = archive_entry_hardlink(run->entry))) {
if (strcmp(tmp, old_name) == 0) {
/* the node in "run" is a hardlink to "node",
* correct the path */
//log("correcting hardlink '%s' from '%s' to '%s'", run->name, old_name, new_name);
archive_entry_set_hardlink(
run->entry, new_name);
}
}
if (run->child) {
correct_hardlinks_to_node(run->child, old_name, new_name);
}
run = run->hh.next;
}
}
void
correct_name_in_entry (NODE *node)
{
if (root->child &&
node->name[0] == '/' &&
archive_entry_pathname(root->child->entry)[0] != '/')
{
log ("correcting name in entry to '%s'", node->name+1);
archive_entry_set_pathname(node->entry, node->name + 1);
} else {
log ("correcting name in entry to '%s'", node->name);
archive_entry_set_pathname(node->entry, node->name);
}
}
static NODE *
get_node_for_path(NODE *start, const char *path)
{
NODE *ret = NULL;
//log("get_node_for_path path: '%s' start: '%s'", path, start->name);
/* Check if start is a perfect match */
if (strcmp(path, start->name + (*path=='/'?0:1)) == 0) {
//log(" get_node_for_path path: '%s' start: '%s' return: '%s'", path, start->name, start->name);
return start;
}
/* Check if one of the children match */
if (start->child) {
const char * basename;
const char * baseend;
/* Find the part of the path we are now looking for */
basename = path + strlen(start->name) - (*path=='/'?0:1);
if (*basename == '/')
basename++;
baseend = strchrnul(basename, '/');
//log("get_node_for_path path: '%s' start: '%s' basename: '%s' len: %ld", path, start->name, basename, baseend - basename);
HASH_FIND(hh, start->child, basename, baseend - basename, ret);
if (ret) {
ret = get_node_for_path(ret, path);
}
}
//log(" get_node_for_path path: '%s' start: '%s' return: '%s'", path, start->name, ret == NULL ? "(null)" : ret->name);
return ret;
}
static NODE *
get_node_for_entry(NODE *start, struct archive_entry *entry)
{
NODE *ret = NULL;
NODE *run = start;
const char *path = archive_entry_pathname(entry);
if (*path == '/') {
path++;
}
while (run) {
const char *name = archive_entry_pathname(run->entry);
if (*name == '/') {
name++;
}
if (strcmp(path, name) == 0) {
ret = run;
break;
}
if (run->child) {
if ((ret = get_node_for_entry(run->child, entry))) {
break;
}
}
run = run->hh.next;
}
return ret;
}
static int
rename_recursively(NODE *start, const char *from, const char *to)
{
char *individualName;
char *newName;
int ret = 0;
NODE *node = start;
/* removing and re-inserting nodes while iterating through
the hashtable is a bad idea, so we copy all node ptrs
into an array first and iterate over that instead */
size_t count = HASH_COUNT(start);
NODE *nodes[count];
log ("%s has %zu items", start->parent->name, count);
NODE **dst = &nodes[0];
while (node) {
*dst = node;
++dst;
node = node->hh.next;
}
size_t i;
for (i=0; i<count; ++i) {
node = nodes[i];
if (node->child) {
/* recurse */
ret = rename_recursively(node->child, from, to);
}
remove_child(node);
/* change node name */
individualName = node->name + strlen(from);
if (*to != '/') {
if ((newName = (char *)malloc(strlen(to) +
strlen(individualName) + 2)) == NULL) {
log("Out of memory");
return -ENOMEM;
}
sprintf(newName, "/%s%s", to, individualName);
} else {
if ((newName = (char *)malloc(strlen(to) +
strlen(individualName) + 1)) == NULL) {
log("Out of memory");
return -ENOMEM;
}
sprintf(newName, "%s%s", to, individualName);
}
log ("new name: '%s'", newName);
correct_hardlinks_to_node(root, node->name, newName);
free(node->name);
node->name = newName;
node->basename = strrchr(node->name, '/') + 1;
node->namechanged = 1;
insert_by_path(root, node);
}
return ret;
}
static int
get_temp_file_name(const char *path, char **location)
{
int fh;
/* create name for temp file */
if ((*location = (char *)malloc(
strlen(P_tmpdir) +
strlen("/archivemount_XXXXXX") +
1)) == NULL) {
log("Out of memory");
return -ENOMEM;
}
sprintf(*location, "%s/archivemount_XXXXXX", P_tmpdir);
if ((fh = mkstemp(*location)) == -1) {
log("Could not create temp file name %s: %s",
*location, strerror(errno));
free(*location);
return 0 - errno;
}
close(fh);
unlink(*location);
return 0;
}
/**
* Updates given nodes node->entry by stat'ing node->location. Does not update
* the name!
*/
static int
update_entry_stat(NODE *node)
{
struct stat st;
struct passwd *pwd;
struct group *grp;
if (lstat(node->location, &st) != 0) {
return 0 - errno;
}
archive_entry_set_gid(node->entry, st.st_gid);
archive_entry_set_uid(node->entry, st.st_uid);
archive_entry_set_mtime(node->entry, st.st_mtime, 0);
archive_entry_set_size(node->entry, st.st_size);
archive_entry_set_mode(node->entry, st.st_mode);
archive_entry_set_rdevmajor(node->entry, st.st_dev);
archive_entry_set_rdevminor(node->entry, st.st_dev);
pwd = getpwuid(st.st_uid);
if (pwd) {
archive_entry_set_uname(node->entry, strdup(pwd->pw_name));
}
grp = getgrgid(st.st_gid);
if (grp) {
archive_entry_set_gname(node->entry, strdup(grp->gr_name));
}
return 0;
}
/*
* write a new or modified file to the new archive; used from save()
*/
static void
write_new_modded_file(NODE *node, struct archive_entry *wentry,
struct archive *newarc)
{
if (node->location) {
struct stat st;
int fh = 0;
off_t offset = 0;
void *buf;
ssize_t len = 0;
/* copy stat info */
if (lstat(node->location, &st) != 0) {
log("Could not lstat temporary file %s: %s",
node->location,
strerror(errno));
return;
}
archive_entry_copy_stat(wentry, &st);
/* open temporary file */
fh = open(node->location, O_RDONLY);
if (fh == -1) {
log("Fatal error opening modified file %s at "
"location %s, giving up",
node->name, node->location);
return;
}
/* write header */
archive_write_header(newarc, wentry);
if (S_ISREG(st.st_mode)) {
/* regular file, copy data */
if ((buf = malloc(MAXBUF)) == NULL) {
log("Out of memory");
return;
}
while ((len = pread(fh, buf, (size_t)MAXBUF,
offset)) > 0)
{
archive_write_data(newarc, buf, len);
offset += len;
}
free(buf);
}
if (len == -1) {
log("Error reading temporary file %s for file %s: %s",
node->location,
node->name,
strerror(errno));
close(fh);
return;
}
/* clean up */
close(fh);
if (S_ISDIR(st.st_mode)) {
if (rmdir(node->location) == -1) {
log("WARNING: rmdir '%s' failed: %s",
node->location, strerror(errno));
}
} else {
if (unlink(node->location) == -1) {
log("WARNING: unlinking '%s' failed: %s",
node->location, strerror(errno));
}
}
} else {
/* no data, only write header (e.g. when node is a link!) */
//log("writing header for file %s", archive_entry_pathname(wentry));
archive_write_header(newarc, wentry);
}
/* mark file as written */
node->modified = 0;
}
static int
save(const char *archiveFile)
{
struct archive *oldarc;
struct archive *newarc;
struct archive_entry *entry;
int tempfile;
int format;
int compression;
char *oldfilename;
NODE *node;
oldfilename = malloc(strlen(archiveFile) + 5 + 1);
if (!oldfilename) {
log("Could not allocate memory for oldfilename");
return 0 - ENOMEM;
}
/* unfortunately libarchive does not support modification of
* compressed archives, so a new archive has to be written */
/* rename old archive */
sprintf(oldfilename, "%s.orig", archiveFile);
close(archiveFd);
if (rename(archiveFile, oldfilename) < 0) {
int err = errno;
char *buf = NULL;
char *unknown = "<unknown>";
if (getcwd(buf, 0) == NULL) {
/* getcwd failed, set buf to sth. reasonable */
buf = unknown;
}
log("Could not rename old archive file (%s/%s): %s",
buf, archiveFile, strerror(err));
free(buf);
archiveFd = open(archiveFile, O_RDONLY);
return 0 - err;
}
archiveFd = open(oldfilename, O_RDONLY);
free(oldfilename);
/* open old archive */
if ((oldarc = archive_read_new()) == NULL) {
log("Out of memory");
return -ENOMEM;
}
if (archive_read_support_filter_all(oldarc) != ARCHIVE_OK) {
log("%s", archive_error_string(oldarc));
return archive_errno(oldarc);
}
if (archive_read_support_format_all(oldarc) != ARCHIVE_OK) {
log("%s", archive_error_string(oldarc));
return archive_errno(oldarc);
}
if (options.password) {
if (archive_read_add_passphrase(oldarc, user_passphrase) != ARCHIVE_OK) {
fprintf(stderr, "%s\n", archive_error_string(oldarc));
return archive_errno(oldarc);
}
}
if (archive_read_open_fd(oldarc, archiveFd, BLOCK_SIZE) != ARCHIVE_OK) {
log("%s", archive_error_string(oldarc));
return archive_errno(oldarc);
}
/* Read first header of oldarc so that archive format is set. */
if (archive_read_next_header(oldarc, &entry) != ARCHIVE_OK) {
log("%s", archive_error_string(oldarc));
return archive_errno(oldarc);
}
format = archive_format(oldarc);
compression = archive_filter_code(oldarc, 0);
log("mounted archive format is %s (0x%x)",
archive_format_name(oldarc), format);
log("mounted archive compression is %s (0x%x)",
archive_filter_name(oldarc, 0), compression);
/* open new archive */
if ((newarc = archive_write_new()) == NULL) {
log("Out of memory");
return -ENOMEM;
}
switch(compression) {
case ARCHIVE_COMPRESSION_GZIP:
archive_write_add_filter_gzip(newarc);
break;
case ARCHIVE_COMPRESSION_BZIP2:
archive_write_add_filter_bzip2(newarc);
break;
case ARCHIVE_COMPRESSION_COMPRESS:
case ARCHIVE_COMPRESSION_NONE:
default:
archive_write_add_filter_none(newarc);
break;
}
if (archive_write_set_format(newarc, format) != ARCHIVE_OK) {
log("writing archives of format %d (%s) is not "
"supported", format,
archive_format_name(oldarc));
return -ENOTSUP;
}