X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=src%2Fsystem.c;h=e57e6dafb6398e6b65d3a5cfb5e4b11fa5445112;hb=e496c1b52955887eb0a7544eb621e896c989c6ac;hp=58069cd771de6b48fcbfa318ce48d1eec554ff15;hpb=b085ca30976ec26256344bd3532205d440e69309;p=chaz%2Ftar diff --git a/src/system.c b/src/system.c index 58069cd..e57e6da 100644 --- a/src/system.c +++ b/src/system.c @@ -1,10 +1,10 @@ /* System-dependent calls for tar. - Copyright (C) 2003 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 @@ -14,17 +14,18 @@ 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 "common.h" -#include "rmt.h" +#include +#include #if MSDOS bool -sys_get_archive_stat () +sys_get_archive_stat (void) { return 0; } @@ -36,12 +37,12 @@ sys_file_is_archive (struct tar_stat_info *p) } void -sys_save_archive_dev_ino () +sys_save_archive_dev_ino (void) { } void -sys_detect_dev_null_output () +sys_detect_dev_null_output (void) { static char const dev_null[] = "nul"; @@ -50,7 +51,7 @@ sys_detect_dev_null_output () } void -sys_drain_input_pipe () +sys_drain_input_pipe (void) { } @@ -60,22 +61,31 @@ sys_wait_for_child (pid_t child_pid) } void -sys_spawn_shell () +sys_spawn_shell (void) { spawnl (P_WAIT, getenv ("COMSPEC"), "-", 0); } -void -sys_compare_uid_gid (struct stat *a, struct stat *b) +/* stat() in djgpp's C library gives a constant number of 42 as the + uid and gid of a file. So, comparing an FTP'ed archive just after + unpack would fail on MSDOS. */ + +bool +sys_compare_uid (struct stat *a, struct stat *b) +{ + return true; +} + +bool +sys_compare_gid (struct stat *a, struct stat *b) { - /* stat() in djgpp's C library gives a constant number of 42 as the - uid and gid of a file. So, comparing an FTP'ed archive just after - unpack would fail on MSDOS. */ + return true; } void sys_compare_links (struct stat *link_data, struct stat *stat_data) { + return true; } int @@ -84,26 +94,10 @@ sys_truncate (int fd) return write (fd, "", 0); } -void -sys_reset_uid_gid () -{ -} - -ssize_t +size_t sys_write_archive_buffer (void) { - ssize_t status; - ssize_t written = 0; - - while (0 <= (status = full_write (archive, record_start->buffer + written, - record_size - written))) - { - written += status; - if (written == record_size) - break; - } - - return written ? written : status; + return full_write (archive, record_start->buffer, record_size); } /* Set ARCHIVE for writing, then compressing an archive. */ @@ -127,11 +121,11 @@ extern union block *record_start; /* FIXME */ static struct stat archive_stat; /* stat block for archive file */ bool -sys_get_archive_stat () +sys_get_archive_stat (void) { return fstat (archive, &archive_stat) == 0; } - + bool sys_file_is_archive (struct tar_stat_info *p) { @@ -140,7 +134,7 @@ sys_file_is_archive (struct tar_stat_info *p) /* Save archive file inode and device numbers */ void -sys_save_archive_dev_ino () +sys_save_archive_dev_ino (void) { if (!_isrmt (archive) && S_ISREG (archive_stat.st_mode)) { @@ -153,7 +147,7 @@ sys_save_archive_dev_ino () /* Detect if outputting to "/dev/null". */ void -sys_detect_dev_null_output () +sys_detect_dev_null_output (void) { static char const dev_null[] = "/dev/null"; struct stat dev_null_stat; @@ -172,12 +166,15 @@ sys_detect_dev_null_output () work to do, we might have to revise this area in such time. */ void -sys_drain_input_pipe () +sys_drain_input_pipe (void) { + size_t r; + if (access_mode == ACCESS_READ && ! _isrmt (archive) && (S_ISFIFO (archive_stat.st_mode) || S_ISSOCK (archive_stat.st_mode))) - while (rmtread (archive, record_start->buffer, record_size) > 0) + while ((r = rmtread (archive, record_start->buffer, record_size)) != 0 + && r != SAFE_READ_ERROR) continue; } @@ -205,7 +202,7 @@ sys_wait_for_child (pid_t child_pid) } void -sys_spawn_shell () +sys_spawn_shell (void) { pid_t child; const char *shell = getenv ("SHELL"); @@ -214,7 +211,7 @@ sys_spawn_shell () child = xfork (); if (child == 0) { - execlp (shell, "-sh", "-i", 0); + execlp (shell, "-sh", "-i", (char *) 0); exec_fatal (shell); } else @@ -229,24 +226,23 @@ sys_spawn_shell () } } -void -sys_compare_uid_gid (struct stat *a, struct stat *b) +bool +sys_compare_uid (struct stat *a, struct stat *b) { - if (a->st_uid != b->st_uid) - report_difference (_("Uid differs")); - if (a->st_gid != b->st_gid) - report_difference (_("Gid differs")); + return a->st_uid == b->st_uid; } -void +bool +sys_compare_gid (struct stat *a, struct stat *b) +{ + return a->st_gid == b->st_gid; +} + +bool sys_compare_links (struct stat *link_data, struct stat *stat_data) { - if (stat_data->st_dev != link_data->st_dev - || stat_data->st_ino != link_data->st_ino) - { - report_difference (_("Not linked to %s"), - quote (current_stat_info.link_name)); - } + return stat_data->st_dev == link_data->st_dev + && stat_data->st_ino == link_data->st_ino; } int @@ -256,13 +252,6 @@ sys_truncate (int fd) return pos < 0 ? -1 : ftruncate (fd, pos); } -void -sys_reset_uid_gid () -{ - 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 @@ -276,24 +265,10 @@ is_regular_file (const char *name) return errno == ENOENT; } -ssize_t +size_t sys_write_archive_buffer (void) { - ssize_t status; - ssize_t written = 0; - - while (0 <= (status = rmtwrite (archive, record_start->buffer + written, - record_size - written))) - { - written += status; - if (written == record_size - || _isrmt (archive) - || ! (S_ISFIFO (archive_stat.st_mode) - || S_ISSOCK (archive_stat.st_mode))) - break; - } - - return written ? written : status; + return rmtwrite (archive, record_start->buffer, record_size); } #define PREAD 0 /* read file descriptor from pipe() */ @@ -357,12 +332,10 @@ 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) @@ -370,20 +343,21 @@ 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); } @@ -425,7 +399,7 @@ sys_child_open_for_compress (void) while (1) { - ssize_t status = 0; + size_t status = 0; char *cursor; size_t length; @@ -438,13 +412,12 @@ sys_child_open_for_compress (void) size_t size = record_size - length; status = safe_read (STDIN_FILENO, cursor, size); - if (status <= 0) + if (status == SAFE_READ_ERROR) + read_fatal (use_compress_program_option); + if (status == 0) break; } - if (status < 0) - read_fatal (use_compress_program_option); - /* Copy the record. */ if (status == 0) @@ -507,7 +480,6 @@ sys_child_open_for_uncompress (void) { /* The parent tar is still here! Just clean up. */ - read_full_records_option = 1; archive = parent_pipe[PREAD]; xclose (parent_pipe[PWRITE]); return child_pid; @@ -582,13 +554,13 @@ sys_child_open_for_uncompress (void) char *cursor; size_t maximum; size_t count; - ssize_t status; + size_t status; clear_read_error_count (); error_loop: status = rmtread (archive, record_start->buffer, record_size); - if (status < 0) + if (status == SAFE_READ_ERROR) { archive_read_error (); goto error_loop; @@ -629,5 +601,294 @@ 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 */