New common unarchive code.

1 files changed, 180 insertions, 36 deletions

diff --git a/archival/cpio.c b/archival/cpio.c
index baaa72e..7615175 100644
--- a/archival/cpio.c
+++ b/archival/cpio.c
@@ -31,66 +31,210 @@
 #include "unarchive.h"
 #include "busybox.h"
 
+typedef struct hardlinks_s {
+	file_header_t *entry;
+	int inode;
+	struct hardlinks_s *next;
+} hardlinks_t;
+
 extern int cpio_main(int argc, char **argv)
 {
-	FILE *src_stream = stdin;
-	char **extract_names = NULL;
-	int extract_function = 0;
-	int num_of_entries = 0;
-	int opt = 0;
-	mode_t oldmask = 0;
+	archive_handle_t *archive_handle;
+	int opt;
+
+	/* Initialise */
+	archive_handle = init_handle();
+	archive_handle->src_fd = fileno(stdin);
+	archive_handle->action_header = header_list;
 
 	while ((opt = getopt(argc, argv, "idmuvtF:")) != -1) {
 		switch (opt) {
-		case 'i': // extract
-			extract_function |= extract_all_to_fs;
+		case 'i': /* extract */
+			archive_handle->action_data = data_extract_all;
 			break;
-		case 'd': // create _leading_ directories
-			extract_function |= extract_create_leading_dirs;
-			oldmask = umask(077); /* Make make_directory act like GNU cpio */
+		case 'd': /* create _leading_ directories */
+			archive_handle->flags |= ARCHIVE_CREATE_LEADING_DIRS;
 			break;
-		case 'm': // preserve modification time
-			extract_function |= extract_preserve_date;
+		case 'm': /* preserve modification time */
+			archive_handle->flags |= ARCHIVE_PRESERVE_DATE;
 			break;
-		case 'v': // verbosly list files
-			extract_function |= extract_verbose_list;
+		case 'v': /* verbosly list files */
+			archive_handle->action_header = header_verbose_list;
 			break;
-		case 'u': // unconditional
-			extract_function |= extract_unconditional;
+		case 'u': /* unconditional */
+			archive_handle->flags |= ARCHIVE_EXTRACT_UNCONDITIONAL;
 			break;
-		case 't': // list files
-			extract_function |= extract_list;
+		case 't': /* list files */
+			archive_handle->action_header = header_list;
 			break;
 		case 'F':
-			src_stream = xfopen(optarg, "r");
+			archive_handle->src_fd = xopen(optarg, O_RDONLY);
 			break;
 		default:
 			show_usage();
 		}
 	}
 
-	if ((extract_function & extract_all_to_fs) && (extract_function & extract_list)) {
-		extract_function ^= extract_all_to_fs; /* If specify t, don't extract*/
+	while (optind < argc) {
+		archive_handle->filter = filter_accept_list;
+		archive_handle->accept = add_to_list(archive_handle->accept, argv[optind]);
+		optind++;
 	}
 
-	if ((extract_function & extract_all_to_fs) && (extract_function & extract_verbose_list)) {
-		/* The meaning of v changes on extract */
-		extract_function ^= extract_verbose_list;
-		extract_function |= extract_list;
+	while (1) {
+	 	static hardlinks_t *saved_hardlinks = NULL;
+ 		static unsigned short pending_hardlinks = 0;
+		file_header_t *file_header = archive_handle->file_header;
+		char cpio_header[110];
+		int namesize;
+ 		char dummy[16];
+ 		int major, minor, nlink, inode;
+		char extract_flag;
+
+		if (pending_hardlinks) { /* Deal with any pending hardlinks */
+			hardlinks_t *tmp;
+			hardlinks_t *oldtmp;
+
+			tmp = saved_hardlinks;
+			oldtmp = NULL;
+
+			while (tmp) {
+				error_msg_and_die("need to fix this\n");
+				if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
+					file_header = tmp->entry;
+					if (oldtmp) {
+						oldtmp->next = tmp->next; /* Remove item from linked list */
+					} else {
+						saved_hardlinks = tmp->next;
+					}
+					free(tmp);
+					continue;
+				}
+				oldtmp = tmp;
+				tmp = tmp->next;
+			}
+			pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
 	}
 
-	while (optind < argc) {
-		extract_names = xrealloc(extract_names, sizeof(char *) * (num_of_entries + 2));
-		extract_names[num_of_entries] = xstrdup(argv[optind]);
-		num_of_entries++;
-		extract_names[num_of_entries] = NULL;
-		optind++;
+		/* There can be padding before archive header */
+		archive_handle->offset += data_align(archive_handle->src_fd, archive_handle->offset, 4);
+
+		if (xread_all_eof(archive_handle->src_fd, cpio_header, 110) == 0) {
+			return(EXIT_FAILURE);
+		}
+		archive_handle->offset += 110;
+
+		if (strncmp(&cpio_header[0], "07070", 5) != 0) {
+			printf("cpio header is %x-%x-%x-%x-%x\n",
+				cpio_header[0],
+				cpio_header[1],
+				cpio_header[2],
+				cpio_header[3],
+				cpio_header[4]);
+			error_msg_and_die("Unsupported cpio format");
+		}
+		
+		if ((cpio_header[5] != '1') && (cpio_header[5] != '2')) {
+			error_msg_and_die("Unsupported cpio format, use newc or crc");
+	}
+
+		sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
+			dummy, &inode, (unsigned int*)&file_header->mode, 
+			(unsigned int*)&file_header->uid, (unsigned int*)&file_header->gid,
+			&nlink, &file_header->mtime, &file_header->size,
+			dummy, &major, &minor, &namesize, dummy);
+
+		file_header->name = (char *) xmalloc(namesize + 1);
+		xread(archive_handle->src_fd, file_header->name, namesize); /* Read in filename */
+		file_header->name[namesize] = '\0';
+		archive_handle->offset += namesize;
+
+		/* Update offset amount and skip padding before file contents */
+		archive_handle->offset += data_align(archive_handle->src_fd, archive_handle->offset, 4);
+
+		if (strcmp(file_header->name, "TRAILER!!!") == 0) {
+			printf("%d blocks\n", (int) (archive_handle->offset % 512 ? (archive_handle->offset / 512) + 1 : archive_handle->offset / 512)); /* Always round up */
+			if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
+				hardlinks_t *tmp = saved_hardlinks;
+				hardlinks_t *oldtmp = NULL;
+				while (tmp) {
+					error_msg("%s not created: cannot resolve hardlink", tmp->entry->name);
+					oldtmp = tmp;
+					tmp = tmp->next;
+					free (oldtmp->entry->name);
+					free (oldtmp->entry);
+					free (oldtmp);
+				}
+				saved_hardlinks = NULL;
+				pending_hardlinks = 0;
 	}
+			return(EXIT_FAILURE);
+		}
+
+		if (S_ISLNK(file_header->mode)) {
+			file_header->link_name = (char *) xmalloc(file_header->size + 1);
+			xread(archive_handle->src_fd, file_header->link_name, file_header->size);
+			file_header->link_name[file_header->size] = '\0';
+			archive_handle->offset += file_header->size;
+			file_header->size = 0; /* Stop possible seeks in future */
+		}
+		if (nlink > 1 && !S_ISDIR(file_header->mode)) {
+			if (file_header->size == 0) { /* Put file on a linked list for later */
+				hardlinks_t *new = xmalloc(sizeof(hardlinks_t));
+				new->next = saved_hardlinks;
+				new->inode = inode;
+				new->entry = file_header;
+				saved_hardlinks = new;
+				continue;
+			} else { /* Found the file with data in */
+				hardlinks_t *tmp = saved_hardlinks;
+				pending_hardlinks = 1;
+				while (tmp) {
+					if (tmp->inode == inode) {
+						tmp->entry->link_name = xstrdup(file_header->name);
+						nlink--;
+					}
+					tmp = tmp->next;
+				}
+				if (nlink > 1) {
+					error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
+				}
+			}
+		}
+		file_header->device = (major << 8) | minor;
+
+		extract_flag = FALSE;
+		if (archive_handle->filter(archive_handle->accept, archive_handle->reject, file_header->name) == EXIT_SUCCESS) {
+			struct stat statbuf;
 
-	unarchive(src_stream, stdout, &get_header_cpio, extract_function, "./", extract_names, NULL);
-	if (oldmask) {
-		umask(oldmask); /* Restore umask if we changed it */
+			extract_flag = TRUE;
+
+			/* Check if the file already exists */
+			if (lstat (file_header->name, &statbuf) == 0) {
+				if ((archive_handle->flags & ARCHIVE_EXTRACT_UNCONDITIONAL) || (statbuf.st_mtime < file_header->mtime)) {
+					/* Remove file if flag set or its older than the file to be extracted */
+					if (unlink(file_header->name) == -1) {
+						perror_msg_and_die("Couldnt remove old file");
+					}
+				} else {
+					if (! archive_handle->flags & ARCHIVE_EXTRACT_QUIET) {
+						error_msg("%s not created: newer or same age file exists", file_header->name);
+					}
+					extract_flag = FALSE;
+				}
+			}
+			archive_handle->action_header(file_header);
+		}
+
+		archive_handle->action_header(file_header);
+		if (extract_flag) {
+			archive_handle->action_data(archive_handle);
+		} else {
+			data_skip(archive_handle);
+		}
+		archive_handle->offset += file_header->size;
 	}
-	return EXIT_SUCCESS;
+
+	return(EXIT_SUCCESS);
 }