6111f967f5
function old new delta get_header_tar 1478 1759 +281 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
|
|
#include "libbb.h"
|
|
#include "bb_archive.h"
|
|
|
|
enum {
|
|
//TAR_FILETYPE,
|
|
TAR_MODE,
|
|
TAR_FILENAME,
|
|
TAR_REALNAME,
|
|
#if ENABLE_FEATURE_TAR_UNAME_GNAME
|
|
TAR_UNAME,
|
|
TAR_GNAME,
|
|
#endif
|
|
TAR_SIZE,
|
|
TAR_UID,
|
|
TAR_GID,
|
|
TAR_MAX,
|
|
};
|
|
|
|
static const char *const tar_var[] = {
|
|
// "FILETYPE",
|
|
"MODE",
|
|
"FILENAME",
|
|
"REALNAME",
|
|
#if ENABLE_FEATURE_TAR_UNAME_GNAME
|
|
"UNAME",
|
|
"GNAME",
|
|
#endif
|
|
"SIZE",
|
|
"UID",
|
|
"GID",
|
|
};
|
|
|
|
static void xputenv(char *str)
|
|
{
|
|
if (putenv(str))
|
|
bb_error_msg_and_die(bb_msg_memory_exhausted);
|
|
}
|
|
|
|
static void str2env(char *env[], int idx, const char *str)
|
|
{
|
|
env[idx] = xasprintf("TAR_%s=%s", tar_var[idx], str);
|
|
xputenv(env[idx]);
|
|
}
|
|
|
|
static void dec2env(char *env[], int idx, unsigned long long val)
|
|
{
|
|
env[idx] = xasprintf("TAR_%s=%llu", tar_var[idx], val);
|
|
xputenv(env[idx]);
|
|
}
|
|
|
|
static void oct2env(char *env[], int idx, unsigned long val)
|
|
{
|
|
env[idx] = xasprintf("TAR_%s=%lo", tar_var[idx], val);
|
|
xputenv(env[idx]);
|
|
}
|
|
|
|
void FAST_FUNC data_extract_to_command(archive_handle_t *archive_handle)
|
|
{
|
|
file_header_t *file_header = archive_handle->file_header;
|
|
|
|
#if 0 /* do we need this? ENABLE_FEATURE_TAR_SELINUX */
|
|
char *sctx = archive_handle->tar__sctx[PAX_NEXT_FILE];
|
|
if (!sctx)
|
|
sctx = archive_handle->tar__sctx[PAX_GLOBAL];
|
|
if (sctx) { /* setfscreatecon is 4 syscalls, avoid if possible */
|
|
setfscreatecon(sctx);
|
|
free(archive_handle->tar__sctx[PAX_NEXT_FILE]);
|
|
archive_handle->tar__sctx[PAX_NEXT_FILE] = NULL;
|
|
}
|
|
#endif
|
|
|
|
if ((file_header->mode & S_IFMT) == S_IFREG) {
|
|
pid_t pid;
|
|
int p[2], status;
|
|
char *tar_env[TAR_MAX];
|
|
|
|
memset(tar_env, 0, sizeof(tar_env));
|
|
|
|
xpipe(p);
|
|
pid = BB_MMU ? xfork() : xvfork();
|
|
if (pid == 0) {
|
|
/* Child */
|
|
/* str2env(tar_env, TAR_FILETYPE, "f"); - parent should do it once */
|
|
oct2env(tar_env, TAR_MODE, file_header->mode);
|
|
str2env(tar_env, TAR_FILENAME, file_header->name);
|
|
str2env(tar_env, TAR_REALNAME, file_header->name);
|
|
#if ENABLE_FEATURE_TAR_UNAME_GNAME
|
|
str2env(tar_env, TAR_UNAME, file_header->tar__uname);
|
|
str2env(tar_env, TAR_GNAME, file_header->tar__gname);
|
|
#endif
|
|
dec2env(tar_env, TAR_SIZE, file_header->size);
|
|
dec2env(tar_env, TAR_UID, file_header->uid);
|
|
dec2env(tar_env, TAR_GID, file_header->gid);
|
|
close(p[1]);
|
|
xdup2(p[0], STDIN_FILENO);
|
|
signal(SIGPIPE, SIG_DFL);
|
|
execl(archive_handle->tar__to_command_shell,
|
|
archive_handle->tar__to_command_shell,
|
|
"-c",
|
|
archive_handle->tar__to_command,
|
|
NULL);
|
|
bb_perror_msg_and_die("can't execute '%s'", archive_handle->tar__to_command_shell);
|
|
}
|
|
close(p[0]);
|
|
/* Our caller is expected to do signal(SIGPIPE, SIG_IGN)
|
|
* so that we don't die if child don't read all the input: */
|
|
bb_copyfd_exact_size(archive_handle->src_fd, p[1], -file_header->size);
|
|
close(p[1]);
|
|
|
|
if (safe_waitpid(pid, &status, 0) == -1)
|
|
bb_perror_msg_and_die("waitpid");
|
|
if (WIFEXITED(status) && WEXITSTATUS(status))
|
|
bb_error_msg_and_die("'%s' returned status %d",
|
|
archive_handle->tar__to_command, WEXITSTATUS(status));
|
|
if (WIFSIGNALED(status))
|
|
bb_error_msg_and_die("'%s' terminated on signal %d",
|
|
archive_handle->tar__to_command, WTERMSIG(status));
|
|
|
|
if (!BB_MMU) {
|
|
int i;
|
|
for (i = 0; i < TAR_MAX; i++) {
|
|
if (tar_env[i])
|
|
bb_unsetenv_and_free(tar_env[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
#if 0 /* ENABLE_FEATURE_TAR_SELINUX */
|
|
if (sctx)
|
|
/* reset the context after creating an entry */
|
|
setfscreatecon(NULL);
|
|
#endif
|
|
}
|