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Patch from Laurence Anderson <L.D.Anderson@warwick.ac.uk> for

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better tape drive support in tar/cpio by using an intervening
pipe...
This commit is contained in:
Eric Andersen 2002-04-13 08:43:01 +00:00
parent 1d1d2f9b18
commit 114de55668
2 changed files with 25 additions and 1 deletions
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3
archival/config.in
View File

@ -20,5 +20,8 @@ if [ "$CONFIG_TAR" = "y" ] ; then
bool ' Enable -X and --exclude options (exclude files)' CONFIG_FEATURE_TAR_EXCLUDE
bool ' Enable -z option (currently only for extracting)' CONFIG_FEATURE_TAR_GZIP
fi
if [ "$CONFIG_CPIO" = "y" -o "$CONFIG_TAR" = "y" ] ; then
bool ' Enable tape drive support' CONFIG_FEATURE_UNARCHIVE_TAPE
fi
bool 'unzip' CONFIG_UNZIP
endmenu

23
archival/libunarchive/unarchive.c
View File

@ -21,8 +21,10 @@
#include <string.h>
#include <unistd.h>
#include <utime.h>
#include <sys/wait.h>
#include <signal.h>
#include "unarchive.h"
#include "libbb.h"
#include "busybox.h"
/* Extract the data postioned at src_stream to either filesystem, stdout or
* buffer depending on the value of 'function' which is defined in libbb.h
@ -202,7 +204,22 @@ char *unarchive(FILE *src_stream, FILE *out_stream, file_header_t *(*get_headers
int extract_flag = TRUE;
int i;
char *buffer = NULL;
#ifdef CONFIG_FEATURE_UNARCHIVE_TAPE
int pid, tape_pipe[2];
if (pipe(tape_pipe) != 0) error_msg_and_die("Can't create pipe\n");
if ((pid = fork()) == -1) error_msg_and_die("Fork failed\n");
if (pid==0) { /* child process */
close(tape_pipe[0]); /* We don't wan't to read from the pipe */
copyfd(fileno(src_stream), tape_pipe[1]);
close(tape_pipe[1]); /* Send EOF */
exit(0);
/* notreached */
}
close(tape_pipe[1]); /* Don't want to write down the pipe */
fclose(src_stream);
src_stream = fdopen(tape_pipe[0], "r");
#endif
archive_offset = 0;
while ((file_entry = get_headers(src_stream)) != NULL) {
@ -238,5 +255,9 @@ char *unarchive(FILE *src_stream, FILE *out_stream, file_header_t *(*get_headers
free(file_entry->link_name);
free(file_entry);
}
#ifdef CONFIG_FEATURE_UNARCHIVE_TAPE
kill(pid, SIGTERM);
waitpid(pid, NULL, 0);
#endif
return(buffer);
}