ee56bd0d0b
set read_full_records_option: the compressed archive is likely not to contain integer number of records. Should the user wish to use reblocking, he may always give tar -B option. This is a minor improvement over the change dated 2004-03-22.
643 lines
15 KiB
C
643 lines
15 KiB
C
/* System-dependent calls for tar.
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Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "system.h"
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#include "common.h"
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#include "rmt.h"
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#include <signal.h>
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void
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sys_stat_nanoseconds (struct tar_stat_info *st)
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{
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#if defined(HAVE_STRUCT_STAT_ST_SPARE1)
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st->atime_nsec = st->stat.st_spare1 * 1000;
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st->mtime_nsec = st->stat.st_spare2 * 1000;
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st->ctime_nsec = st->stat.st_spare3 * 1000;
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#elif defined(HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC)
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st->atime_nsec = st->stat.st_atim.tv_nsec;
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st->mtime_nsec = st->stat.st_mtim.tv_nsec;
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st->ctime_nsec = st->stat.st_ctim.tv_nsec;
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#elif defined(HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC)
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st->atime_nsec = st->stat.st_atimespec.tv_nsec;
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st->mtime_nsec = st->stat.st_mtimespec.tv_nsec;
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st->ctime_nsec = st->stat.st_ctimespec.tv_nsec;
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#elif defined(HAVE_STRUCT_STAT_ST_ATIMENSEC)
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st->atime_nsec = st->stat.st_atimensec;
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st->mtime_nsec = st->stat.st_mtimensec;
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st->ctime_nsec = st->stat.st_ctimensec;
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#else
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st->atime_nsec = st->mtime_nsec = st->ctime_nsec = 0;
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#endif
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}
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#if MSDOS
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bool
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sys_get_archive_stat (void)
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{
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return 0;
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}
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bool
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sys_file_is_archive (struct tar_stat_info *p)
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{
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return false;
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}
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void
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sys_save_archive_dev_ino (void)
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{
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}
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void
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sys_detect_dev_null_output (void)
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{
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static char const dev_null[] = "nul";
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dev_null_output = (strcmp (archive_name_array[0], dev_null) == 0
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|| (! _isrmt (archive)));
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}
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void
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sys_drain_input_pipe (void)
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{
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}
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void
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sys_wait_for_child (pid_t child_pid)
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{
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}
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void
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sys_spawn_shell (void)
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{
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spawnl (P_WAIT, getenv ("COMSPEC"), "-", 0);
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}
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/* stat() in djgpp's C library gives a constant number of 42 as the
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uid and gid of a file. So, comparing an FTP'ed archive just after
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unpack would fail on MSDOS. */
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bool
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sys_compare_uid (struct stat *a, struct stat *b)
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{
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return true;
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}
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bool
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sys_compare_gid (struct stat *a, struct stat *b)
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{
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return true;
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}
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void
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sys_compare_links (struct stat *link_data, struct stat *stat_data)
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{
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return true;
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}
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int
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sys_truncate (int fd)
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{
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return write (fd, "", 0);
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}
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void
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sys_reset_uid_gid (void)
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{
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}
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size_t
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sys_write_archive_buffer (void)
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{
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return full_write (archive, record_start->buffer, record_size);
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}
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/* Set ARCHIVE for writing, then compressing an archive. */
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void
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sys_child_open_for_compress (void)
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{
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FATAL_ERROR ((0, 0, _("Cannot use compressed or remote archives")));
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}
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/* Set ARCHIVE for uncompressing, then reading an archive. */
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void
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sys_child_open_for_uncompress (void)
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{
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FATAL_ERROR ((0, 0, _("Cannot use compressed or remote archives")));
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}
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#else
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extern union block *record_start; /* FIXME */
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static struct stat archive_stat; /* stat block for archive file */
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bool
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sys_get_archive_stat (void)
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{
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return fstat (archive, &archive_stat) == 0;
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}
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bool
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sys_file_is_archive (struct tar_stat_info *p)
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{
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return (ar_dev && p->stat.st_dev == ar_dev && p->stat.st_ino == ar_ino);
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}
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/* Save archive file inode and device numbers */
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void
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sys_save_archive_dev_ino (void)
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{
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if (!_isrmt (archive) && S_ISREG (archive_stat.st_mode))
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{
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ar_dev = archive_stat.st_dev;
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ar_ino = archive_stat.st_ino;
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}
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else
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ar_dev = 0;
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}
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/* Detect if outputting to "/dev/null". */
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void
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sys_detect_dev_null_output (void)
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{
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static char const dev_null[] = "/dev/null";
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struct stat dev_null_stat;
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dev_null_output = (strcmp (archive_name_array[0], dev_null) == 0
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|| (! _isrmt (archive)
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&& S_ISCHR (archive_stat.st_mode)
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&& stat (dev_null, &dev_null_stat) == 0
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&& archive_stat.st_dev == dev_null_stat.st_dev
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&& archive_stat.st_ino == dev_null_stat.st_ino));
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}
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/* Manage to fully drain a pipe we might be reading, so to not break it on
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the producer after the EOF block. FIXME: one of these days, GNU tar
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might become clever enough to just stop working, once there is no more
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work to do, we might have to revise this area in such time. */
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void
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sys_drain_input_pipe (void)
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{
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size_t r;
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if (access_mode == ACCESS_READ
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&& ! _isrmt (archive)
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&& (S_ISFIFO (archive_stat.st_mode) || S_ISSOCK (archive_stat.st_mode)))
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while ((r = rmtread (archive, record_start->buffer, record_size)) != 0
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&& r != SAFE_READ_ERROR)
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continue;
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}
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void
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sys_wait_for_child (pid_t child_pid)
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{
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if (child_pid)
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{
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int wait_status;
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while (waitpid (child_pid, &wait_status, 0) == -1)
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if (errno != EINTR)
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{
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waitpid_error (use_compress_program_option);
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break;
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}
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if (WIFSIGNALED (wait_status))
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ERROR ((0, 0, _("Child died with signal %d"),
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WTERMSIG (wait_status)));
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else if (WEXITSTATUS (wait_status) != 0)
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ERROR ((0, 0, _("Child returned status %d"),
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WEXITSTATUS (wait_status)));
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}
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}
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void
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sys_spawn_shell (void)
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{
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pid_t child;
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const char *shell = getenv ("SHELL");
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if (! shell)
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shell = "/bin/sh";
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child = xfork ();
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if (child == 0)
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{
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execlp (shell, "-sh", "-i", (char *) 0);
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exec_fatal (shell);
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}
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else
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{
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int wait_status;
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while (waitpid (child, &wait_status, 0) == -1)
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if (errno != EINTR)
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{
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waitpid_error (shell);
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break;
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}
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}
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}
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bool
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sys_compare_uid (struct stat *a, struct stat *b)
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{
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return a->st_uid == b->st_uid;
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}
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bool
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sys_compare_gid (struct stat *a, struct stat *b)
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{
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return a->st_gid == b->st_gid;
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}
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bool
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sys_compare_links (struct stat *link_data, struct stat *stat_data)
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{
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return stat_data->st_dev == link_data->st_dev
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&& stat_data->st_ino == link_data->st_ino;
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}
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int
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sys_truncate (int fd)
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{
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off_t pos = lseek (fd, (off_t) 0, SEEK_CUR);
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return pos < 0 ? -1 : ftruncate (fd, pos);
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}
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void
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sys_reset_uid_gid (void)
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{
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setuid (getuid ());
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setgid (getgid ());
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}
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/* Return nonzero if NAME is the name of a regular file, or if the file
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does not exist (so it would be created as a regular file). */
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static int
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is_regular_file (const char *name)
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{
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struct stat stbuf;
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if (stat (name, &stbuf) == 0)
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return S_ISREG (stbuf.st_mode);
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else
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return errno == ENOENT;
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}
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size_t
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sys_write_archive_buffer (void)
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{
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return rmtwrite (archive, record_start->buffer, record_size);
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}
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#define PREAD 0 /* read file descriptor from pipe() */
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#define PWRITE 1 /* write file descriptor from pipe() */
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/* Duplicate file descriptor FROM into becoming INTO.
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INTO is closed first and has to be the next available slot. */
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static void
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xdup2 (int from, int into)
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{
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if (from != into)
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{
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int status = close (into);
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if (status != 0 && errno != EBADF)
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{
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int e = errno;
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FATAL_ERROR ((0, e, _("Cannot close")));
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}
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status = dup (from);
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if (status != into)
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{
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if (status < 0)
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{
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int e = errno;
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FATAL_ERROR ((0, e, _("Cannot dup")));
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}
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abort ();
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}
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xclose (from);
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}
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}
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/* Set ARCHIVE for writing, then compressing an archive. */
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pid_t
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sys_child_open_for_compress (void)
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{
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int parent_pipe[2];
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int child_pipe[2];
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pid_t grandchild_pid;
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pid_t child_pid;
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int wait_status;
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xpipe (parent_pipe);
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child_pid = xfork ();
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if (child_pid > 0)
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{
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/* The parent tar is still here! Just clean up. */
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archive = parent_pipe[PWRITE];
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xclose (parent_pipe[PREAD]);
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return child_pid;
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}
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/* The new born child tar is here! */
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program_name = _("tar (child)");
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xdup2 (parent_pipe[PREAD], STDIN_FILENO);
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xclose (parent_pipe[PWRITE]);
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/* Check if we need a grandchild tar. This happens only if either:
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a) we are writing stdout: to force reblocking;
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b) the file is to be accessed by rmt: compressor doesn't know how;
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c) the file is not a plain file. */
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if (strcmp (archive_name_array[0], "-") != 0
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&& !_remdev (archive_name_array[0])
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&& is_regular_file (archive_name_array[0]))
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{
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if (backup_option)
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maybe_backup_file (archive_name_array[0], 1);
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/* We don't need a grandchild tar. Open the archive and launch the
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compressor. */
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archive = creat (archive_name_array[0], MODE_RW);
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if (archive < 0)
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{
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int saved_errno = errno;
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if (backup_option)
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undo_last_backup ();
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errno = saved_errno;
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open_fatal (archive_name_array[0]);
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}
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xdup2 (archive, STDOUT_FILENO);
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execlp (use_compress_program_option, use_compress_program_option,
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(char *) 0);
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exec_fatal (use_compress_program_option);
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}
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/* We do need a grandchild tar. */
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xpipe (child_pipe);
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grandchild_pid = xfork ();
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if (grandchild_pid == 0)
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{
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/* The newborn grandchild tar is here! Launch the compressor. */
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program_name = _("tar (grandchild)");
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xdup2 (child_pipe[PWRITE], STDOUT_FILENO);
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xclose (child_pipe[PREAD]);
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execlp (use_compress_program_option, use_compress_program_option,
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(char *) 0);
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exec_fatal (use_compress_program_option);
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}
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/* The child tar is still here! */
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/* Prepare for reblocking the data from the compressor into the archive. */
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xdup2 (child_pipe[PREAD], STDIN_FILENO);
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xclose (child_pipe[PWRITE]);
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if (strcmp (archive_name_array[0], "-") == 0)
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archive = STDOUT_FILENO;
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else
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{
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archive = rmtcreat (archive_name_array[0], MODE_RW, rsh_command_option);
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if (archive < 0)
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open_fatal (archive_name_array[0]);
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}
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/* Let's read out of the stdin pipe and write an archive. */
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while (1)
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{
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size_t status = 0;
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char *cursor;
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size_t length;
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/* Assemble a record. */
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for (length = 0, cursor = record_start->buffer;
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length < record_size;
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length += status, cursor += status)
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{
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size_t size = record_size - length;
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status = safe_read (STDIN_FILENO, cursor, size);
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if (status == SAFE_READ_ERROR)
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read_fatal (use_compress_program_option);
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if (status == 0)
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break;
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}
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/* Copy the record. */
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if (status == 0)
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{
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/* We hit the end of the file. Write last record at
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full length, as the only role of the grandchild is
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doing proper reblocking. */
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if (length > 0)
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{
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memset (record_start->buffer + length, 0, record_size - length);
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status = sys_write_archive_buffer ();
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if (status != record_size)
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archive_write_error (status);
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}
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/* There is nothing else to read, break out. */
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break;
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}
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status = sys_write_archive_buffer ();
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if (status != record_size)
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archive_write_error (status);
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}
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/* Propagate any failure of the grandchild back to the parent. */
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while (waitpid (grandchild_pid, &wait_status, 0) == -1)
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if (errno != EINTR)
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{
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waitpid_error (use_compress_program_option);
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break;
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}
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if (WIFSIGNALED (wait_status))
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{
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kill (child_pid, WTERMSIG (wait_status));
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exit_status = TAREXIT_FAILURE;
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}
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else if (WEXITSTATUS (wait_status) != 0)
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exit_status = WEXITSTATUS (wait_status);
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exit (exit_status);
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}
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/* Set ARCHIVE for uncompressing, then reading an archive. */
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pid_t
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sys_child_open_for_uncompress (void)
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{
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int parent_pipe[2];
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int child_pipe[2];
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pid_t grandchild_pid;
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pid_t child_pid;
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int wait_status;
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xpipe (parent_pipe);
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child_pid = xfork ();
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if (child_pid > 0)
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{
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/* The parent tar is still here! Just clean up. */
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archive = parent_pipe[PREAD];
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xclose (parent_pipe[PWRITE]);
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return child_pid;
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}
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/* The newborn child tar is here! */
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program_name = _("tar (child)");
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xdup2 (parent_pipe[PWRITE], STDOUT_FILENO);
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xclose (parent_pipe[PREAD]);
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/* Check if we need a grandchild tar. This happens only if either:
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a) we're reading stdin: to force unblocking;
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b) the file is to be accessed by rmt: compressor doesn't know how;
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c) the file is not a plain file. */
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if (strcmp (archive_name_array[0], "-") != 0
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&& !_remdev (archive_name_array[0])
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&& is_regular_file (archive_name_array[0]))
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{
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/* We don't need a grandchild tar. Open the archive and lauch the
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uncompressor. */
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archive = open (archive_name_array[0], O_RDONLY | O_BINARY, MODE_RW);
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if (archive < 0)
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open_fatal (archive_name_array[0]);
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xdup2 (archive, STDIN_FILENO);
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execlp (use_compress_program_option, use_compress_program_option,
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"-d", (char *) 0);
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exec_fatal (use_compress_program_option);
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}
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/* We do need a grandchild tar. */
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xpipe (child_pipe);
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grandchild_pid = xfork ();
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if (grandchild_pid == 0)
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{
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/* The newborn grandchild tar is here! Launch the uncompressor. */
|
|
|
|
program_name = _("tar (grandchild)");
|
|
|
|
xdup2 (child_pipe[PREAD], STDIN_FILENO);
|
|
xclose (child_pipe[PWRITE]);
|
|
execlp (use_compress_program_option, use_compress_program_option,
|
|
"-d", (char *) 0);
|
|
exec_fatal (use_compress_program_option);
|
|
}
|
|
|
|
/* The child tar is still here! */
|
|
|
|
/* Prepare for unblocking the data from the archive into the
|
|
uncompressor. */
|
|
|
|
xdup2 (child_pipe[PWRITE], STDOUT_FILENO);
|
|
xclose (child_pipe[PREAD]);
|
|
|
|
if (strcmp (archive_name_array[0], "-") == 0)
|
|
archive = STDIN_FILENO;
|
|
else
|
|
archive = rmtopen (archive_name_array[0], O_RDONLY | O_BINARY,
|
|
MODE_RW, rsh_command_option);
|
|
if (archive < 0)
|
|
open_fatal (archive_name_array[0]);
|
|
|
|
/* Let's read the archive and pipe it into stdout. */
|
|
|
|
while (1)
|
|
{
|
|
char *cursor;
|
|
size_t maximum;
|
|
size_t count;
|
|
size_t status;
|
|
|
|
clear_read_error_count ();
|
|
|
|
error_loop:
|
|
status = rmtread (archive, record_start->buffer, record_size);
|
|
if (status == SAFE_READ_ERROR)
|
|
{
|
|
archive_read_error ();
|
|
goto error_loop;
|
|
}
|
|
if (status == 0)
|
|
break;
|
|
cursor = record_start->buffer;
|
|
maximum = status;
|
|
while (maximum)
|
|
{
|
|
count = maximum < BLOCKSIZE ? maximum : BLOCKSIZE;
|
|
if (full_write (STDOUT_FILENO, cursor, count) != count)
|
|
write_error (use_compress_program_option);
|
|
cursor += count;
|
|
maximum -= count;
|
|
}
|
|
}
|
|
|
|
xclose (STDOUT_FILENO);
|
|
|
|
/* Propagate any failure of the grandchild back to the parent. */
|
|
|
|
while (waitpid (grandchild_pid, &wait_status, 0) == -1)
|
|
if (errno != EINTR)
|
|
{
|
|
waitpid_error (use_compress_program_option);
|
|
break;
|
|
}
|
|
|
|
if (WIFSIGNALED (wait_status))
|
|
{
|
|
kill (child_pid, WTERMSIG (wait_status));
|
|
exit_status = TAREXIT_FAILURE;
|
|
}
|
|
else if (WEXITSTATUS (wait_status) != 0)
|
|
exit_status = WEXITSTATUS (wait_status);
|
|
|
|
exit (exit_status);
|
|
}
|
|
|
|
#endif /* not MSDOS */
|
|
|