X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=src%2Fsystem.c;h=fb5a8fa5a147e2040cfd99535ab5d5d6bf5eec30;hb=e33be3d0a1902527f2b5be2388a1322068fcb135;hp=cd8f77c2eadf3a75845708b162b5f6d6248c3f3f;hpb=ee56bd0d0bbd1fa8a203826ebeb8ebb9eff176b2;p=chaz%2Ftar diff --git a/src/system.c b/src/system.c index cd8f77c..fb5a8fa 100644 --- a/src/system.c +++ b/src/system.c @@ -1,10 +1,10 @@ /* System-dependent calls for tar. - Copyright (C) 2003, 2004 Free Software Foundation, Inc. + Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the - Free Software Foundation; either version 2, or (at your option) any later + Free Software Foundation; either version 3, or (at your option) any later version. This program is distributed in the hope that it will be useful, but @@ -14,38 +14,15 @@ You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., - 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ -#include "system.h" +#include +#include #include "common.h" -#include "rmt.h" +#include #include -void -sys_stat_nanoseconds (struct tar_stat_info *st) -{ -#if defined(HAVE_STRUCT_STAT_ST_SPARE1) - st->atime_nsec = st->stat.st_spare1 * 1000; - st->mtime_nsec = st->stat.st_spare2 * 1000; - st->ctime_nsec = st->stat.st_spare3 * 1000; -#elif defined(HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC) - st->atime_nsec = st->stat.st_atim.tv_nsec; - st->mtime_nsec = st->stat.st_mtim.tv_nsec; - st->ctime_nsec = st->stat.st_ctim.tv_nsec; -#elif defined(HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC) - st->atime_nsec = st->stat.st_atimespec.tv_nsec; - st->mtime_nsec = st->stat.st_mtimespec.tv_nsec; - st->ctime_nsec = st->stat.st_ctimespec.tv_nsec; -#elif defined(HAVE_STRUCT_STAT_ST_ATIMENSEC) - st->atime_nsec = st->stat.st_atimensec; - st->mtime_nsec = st->stat.st_mtimensec; - st->ctime_nsec = st->stat.st_ctimensec; -#else - st->atime_nsec = st->mtime_nsec = st->ctime_nsec = 0; -#endif -} - #if MSDOS bool @@ -118,11 +95,6 @@ sys_truncate (int fd) return write (fd, "", 0); } -void -sys_reset_uid_gid (void) -{ -} - size_t sys_write_archive_buffer (void) { @@ -281,13 +253,6 @@ sys_truncate (int fd) return pos < 0 ? -1 : ftruncate (fd, pos); } -void -sys_reset_uid_gid (void) -{ - setuid (getuid ()); - setgid (getgid ()); -} - /* Return nonzero if NAME is the name of a regular file, or if the file does not exist (so it would be created as a regular file). */ static int @@ -368,12 +333,10 @@ sys_child_open_for_compress (void) xclose (parent_pipe[PWRITE]); /* Check if we need a grandchild tar. This happens only if either: - a) we are writing stdout: to force reblocking; - b) the file is to be accessed by rmt: compressor doesn't know how; - c) the file is not a plain file. */ + a) the file is to be accessed by rmt: compressor doesn't know how; + b) the file is not a plain file. */ - if (strcmp (archive_name_array[0], "-") != 0 - && !_remdev (archive_name_array[0]) + if (!_remdev (archive_name_array[0]) && is_regular_file (archive_name_array[0])) { if (backup_option) @@ -381,20 +344,21 @@ sys_child_open_for_compress (void) /* We don't need a grandchild tar. Open the archive and launch the compressor. */ - - archive = creat (archive_name_array[0], MODE_RW); - if (archive < 0) + if (strcmp (archive_name_array[0], "-")) { - int saved_errno = errno; + archive = creat (archive_name_array[0], MODE_RW); + if (archive < 0) + { + int saved_errno = errno; - if (backup_option) - undo_last_backup (); - errno = saved_errno; - open_fatal (archive_name_array[0]); + if (backup_option) + undo_last_backup (); + errno = saved_errno; + open_fatal (archive_name_array[0]); + } + xdup2 (archive, STDOUT_FILENO); } - xdup2 (archive, STDOUT_FILENO); - execlp (use_compress_program_option, use_compress_program_option, - (char *) 0); + execlp (use_compress_program_option, use_compress_program_option, NULL); exec_fatal (use_compress_program_option); } @@ -638,5 +602,294 @@ sys_child_open_for_uncompress (void) exit (exit_status); } -#endif /* not MSDOS */ + + +static void +dec_to_env (char *envar, uintmax_t num) +{ + char buf[UINTMAX_STRSIZE_BOUND]; + char *numstr; + + numstr = STRINGIFY_BIGINT (num, buf); + if (setenv (envar, numstr, 1) != 0) + xalloc_die (); +} + +static void +time_to_env (char *envar, struct timespec t) +{ + char buf[TIMESPEC_STRSIZE_BOUND]; + if (setenv (envar, code_timespec (t, buf), 1) != 0) + xalloc_die (); +} + +static void +oct_to_env (char *envar, unsigned long num) +{ + char buf[1+1+(sizeof(unsigned long)*CHAR_BIT+2)/3]; + + snprintf (buf, sizeof buf, "0%lo", num); + if (setenv (envar, buf, 1) != 0) + xalloc_die (); +} + +static void +str_to_env (char *envar, char const *str) +{ + if (str) + { + if (setenv (envar, str, 1) != 0) + xalloc_die (); + } + else + unsetenv (envar); +} + +static void +chr_to_env (char *envar, char c) +{ + char buf[2]; + buf[0] = c; + buf[1] = 0; + if (setenv (envar, buf, 1) != 0) + xalloc_die (); +} + +static void +stat_to_env (char *name, char type, struct tar_stat_info *st) +{ + str_to_env ("TAR_VERSION", PACKAGE_VERSION); + chr_to_env ("TAR_FILETYPE", type); + oct_to_env ("TAR_MODE", st->stat.st_mode); + str_to_env ("TAR_FILENAME", name); + str_to_env ("TAR_REALNAME", st->file_name); + str_to_env ("TAR_UNAME", st->uname); + str_to_env ("TAR_GNAME", st->gname); + time_to_env ("TAR_ATIME", st->atime); + time_to_env ("TAR_MTIME", st->mtime); + time_to_env ("TAR_CTIME", st->ctime); + dec_to_env ("TAR_SIZE", st->stat.st_size); + dec_to_env ("TAR_UID", st->stat.st_uid); + dec_to_env ("TAR_GID", st->stat.st_gid); + + switch (type) + { + case 'b': + case 'c': + dec_to_env ("TAR_MINOR", minor (st->stat.st_rdev)); + dec_to_env ("TAR_MAJOR", major (st->stat.st_rdev)); + unsetenv ("TAR_LINKNAME"); + break; + + case 'l': + case 'h': + unsetenv ("TAR_MINOR"); + unsetenv ("TAR_MAJOR"); + str_to_env ("TAR_LINKNAME", st->link_name); + break; + + default: + unsetenv ("TAR_MINOR"); + unsetenv ("TAR_MAJOR"); + unsetenv ("TAR_LINKNAME"); + break; + } +} + +static pid_t global_pid; +static RETSIGTYPE (*pipe_handler) (int sig); + +int +sys_exec_command (char *file_name, int typechar, struct tar_stat_info *st) +{ + int p[2]; + char *argv[4]; + + xpipe (p); + pipe_handler = signal (SIGPIPE, SIG_IGN); + global_pid = xfork (); + + if (global_pid != 0) + { + xclose (p[PREAD]); + return p[PWRITE]; + } + + /* Child */ + xdup2 (p[PREAD], STDIN_FILENO); + xclose (p[PWRITE]); + + stat_to_env (file_name, typechar, st); + argv[0] = "/bin/sh"; + argv[1] = "-c"; + argv[2] = to_command_option; + argv[3] = NULL; + + execv ("/bin/sh", argv); + + exec_fatal (file_name); +} + +void +sys_wait_command (void) +{ + int status; + + if (global_pid < 0) + return; + + signal (SIGPIPE, pipe_handler); + while (waitpid (global_pid, &status, 0) == -1) + if (errno != EINTR) + { + global_pid = -1; + waitpid_error (to_command_option); + return; + } + + if (WIFEXITED (status)) + { + if (!ignore_command_error_option && WEXITSTATUS (status)) + ERROR ((0, 0, _("%lu: Child returned status %d"), + (unsigned long) global_pid, WEXITSTATUS (status))); + } + else if (WIFSIGNALED (status)) + { + WARN ((0, 0, _("%lu: Child terminated on signal %d"), + (unsigned long) global_pid, WTERMSIG (status))); + } + else + ERROR ((0, 0, _("%lu: Child terminated on unknown reason"), + (unsigned long) global_pid)); + + global_pid = -1; +} + +int +sys_exec_info_script (const char **archive_name, int volume_number) +{ + pid_t pid; + char *argv[4]; + char uintbuf[UINTMAX_STRSIZE_BOUND]; + int p[2]; + static RETSIGTYPE (*saved_handler) (int sig); + + xpipe (p); + saved_handler = signal (SIGPIPE, SIG_IGN); + + pid = xfork (); + + if (pid != 0) + { + /* Master */ + + int rc; + int status; + char *buf = NULL; + size_t size = 0; + FILE *fp; + + xclose (p[PWRITE]); + fp = fdopen (p[PREAD], "r"); + rc = getline (&buf, &size, fp); + fclose (fp); + + if (rc > 0 && buf[rc-1] == '\n') + buf[--rc] = 0; + + while (waitpid (pid, &status, 0) == -1) + if (errno != EINTR) + { + signal (SIGPIPE, saved_handler); + waitpid_error (info_script_option); + return -1; + } + + signal (SIGPIPE, saved_handler); + + if (WIFEXITED (status)) + { + if (WEXITSTATUS (status) == 0 && rc > 0) + *archive_name = buf; + else + free (buf); + return WEXITSTATUS (status); + } + + free (buf); + return -1; + } + + /* Child */ + setenv ("TAR_VERSION", PACKAGE_VERSION, 1); + setenv ("TAR_ARCHIVE", *archive_name, 1); + setenv ("TAR_VOLUME", STRINGIFY_BIGINT (volume_number, uintbuf), 1); + setenv ("TAR_BLOCKING_FACTOR", + STRINGIFY_BIGINT (blocking_factor, uintbuf), 1); + setenv ("TAR_SUBCOMMAND", subcommand_string (subcommand_option), 1); + setenv ("TAR_FORMAT", + archive_format_string (current_format == DEFAULT_FORMAT ? + archive_format : current_format), 1); + setenv ("TAR_FD", STRINGIFY_BIGINT (p[PWRITE], uintbuf), 1); + + xclose (p[PREAD]); + + argv[0] = "/bin/sh"; + argv[1] = "-c"; + argv[2] = (char*) info_script_option; + argv[3] = NULL; + + execv (argv[0], argv); + + exec_fatal (info_script_option); +} + +void +sys_exec_checkpoint_script (const char *script_name, + const char *archive_name, + int checkpoint_number) +{ + pid_t pid; + char *argv[4]; + char uintbuf[UINTMAX_STRSIZE_BOUND]; + + pid = xfork (); + + if (pid != 0) + { + /* Master */ + + int status; + + while (waitpid (pid, &status, 0) == -1) + if (errno != EINTR) + { + waitpid_error (script_name); + break; + } + + return; + } + + /* Child */ + setenv ("TAR_VERSION", PACKAGE_VERSION, 1); + setenv ("TAR_ARCHIVE", archive_name, 1); + setenv ("TAR_CHECKPOINT", STRINGIFY_BIGINT (checkpoint_number, uintbuf), 1); + setenv ("TAR_BLOCKING_FACTOR", + STRINGIFY_BIGINT (blocking_factor, uintbuf), 1); + setenv ("TAR_SUBCOMMAND", subcommand_string (subcommand_option), 1); + setenv ("TAR_FORMAT", + archive_format_string (current_format == DEFAULT_FORMAT ? + archive_format : current_format), 1); + argv[0] = "/bin/sh"; + argv[1] = "-c"; + argv[2] = (char*) script_name; + argv[3] = NULL; + + execv (argv[0], argv); + + exec_fatal (script_name); +} + +#endif /* not MSDOS */