#include "unarchive.h"
typedef struct hardlinks_s {
- char *name;
- int inode;
struct hardlinks_s *next;
+ int inode; /* TODO: must match maj/min too! */
+ int mode ;
+ int mtime; /* These three are useful only in corner case */
+ int uid ; /* of hardlinks with zero size body */
+ int gid ;
+ char name[1];
} hardlinks_t;
char get_header_cpio(archive_handle_t *archive_handle)
{
static hardlinks_t *saved_hardlinks = NULL;
- static unsigned pending_hardlinks = 0;
- static int inode;
+ static hardlinks_t *saved_hardlinks_created = NULL;
file_header_t *file_header = archive_handle->file_header;
char cpio_header[110];
- int namesize;
char dummy[16];
- int major, minor, nlink;
-
- if (pending_hardlinks) { /* Deal with any pending hardlinks */
- hardlinks_t *tmp, *oldtmp;
-
- tmp = saved_hardlinks;
- oldtmp = NULL;
-
- file_header->link_target = file_header->name;
- file_header->size = 0;
-
- while (tmp) {
- if (tmp->inode != inode) {
- tmp = tmp->next;
- continue;
- }
-
- file_header->name = tmp->name;
-
- if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
- archive_handle->action_data(archive_handle);
- archive_handle->action_header(archive_handle->file_header);
- }
-
- pending_hardlinks--;
-
- oldtmp = tmp;
- tmp = tmp->next;
- free(oldtmp->name);
- free(oldtmp);
- if (oldtmp == saved_hardlinks)
- saved_hardlinks = tmp;
- }
-
- file_header->name = file_header->link_target;
-
- if (pending_hardlinks > 1) {
- bb_error_msg("error resolving hardlink: archive made by GNU cpio 2.0-2.2?");
- }
-
- /* No more pending hardlinks, read next file entry */
- pending_hardlinks = 0;
- }
+ int namesize;
+ int major, minor, nlink, mode, inode;
+ unsigned size, uid, gid, mtime;
/* There can be padding before archive header */
data_align(archive_handle, 4);
if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) {
- return EXIT_FAILURE;
+ goto create_hardlinks;
}
archive_handle->offset += 110;
bb_error_msg_and_die("unsupported cpio format, use newc or crc");
}
- {
- unsigned long tmpsize;
- 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, &tmpsize,
- dummy, &major, &minor, &namesize, dummy);
- file_header->size = tmpsize;
- }
+ sscanf(cpio_header + 6,
+ "%8x" "%8x" "%8x" "%8x"
+ "%8x" "%8x" "%8x" /*maj,min:*/ "%16c"
+ /*rmaj,rmin:*/"%8x" "%8x" "%8x" /*chksum:*/ "%8c",
+ &inode, &mode, &uid, &gid,
+ &nlink, &mtime, &size, dummy,
+ &major, &minor, &namesize, dummy);
+ file_header->mode = mode;
+ file_header->uid = uid;
+ file_header->gid = gid;
+ file_header->mtime = mtime;
+ file_header->size = size;
- free(file_header->name);
file_header->name = xzalloc(namesize + 1);
/* Read in filename */
xread(archive_handle->src_fd, file_header->name, namesize);
data_align(archive_handle, 4);
if (strcmp(file_header->name, "TRAILER!!!") == 0) {
- /* Always round up */
- printf("%d blocks\n", (int) (archive_handle->offset % 512 ?
- archive_handle->offset / 512 + 1 :
- archive_handle->offset / 512
- ));
- if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
- hardlinks_t *tmp = saved_hardlinks;
- hardlinks_t *oldtmp = NULL;
- while (tmp) {
- bb_error_msg("%s not created: cannot resolve hardlink", tmp->name);
- oldtmp = tmp;
- tmp = tmp->next;
- free(oldtmp->name);
- free(oldtmp);
- }
- saved_hardlinks = NULL;
- pending_hardlinks = 0;
- }
- return EXIT_FAILURE;
+ /* Always round up. ">> 9" divides by 512 */
+ printf("%"OFF_FMT"u blocks\n", (archive_handle->offset + 511) >> 9);
+ goto create_hardlinks;
}
if (S_ISLNK(file_header->mode)) {
} else {
file_header->link_target = NULL;
}
- 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));
+
+// TODO: data_extract_all can't deal with hardlinks to non-files...
+// (should be !S_ISDIR instead of S_ISREG here)
+
+ if (nlink > 1 && S_ISREG(file_header->mode)) {
+ hardlinks_t *new = xmalloc(sizeof(*new) + namesize);
+ new->inode = inode;
+ new->mode = mode ;
+ new->mtime = mtime;
+ new->uid = uid ;
+ new->gid = gid ;
+ strcpy(new->name, file_header->name);
+ /* Put file on a linked list for later */
+ if (size == 0) {
new->next = saved_hardlinks;
- new->inode = inode;
- /* name current allocated, freed later */
- new->name = file_header->name;
- file_header->name = NULL;
saved_hardlinks = new;
return EXIT_SUCCESS; /* Skip this one */
+ /* TODO: this breaks cpio -t (it does not show hardlinks) */
}
- /* Found the file with data in */
- pending_hardlinks = nlink;
+ new->next = saved_hardlinks_created;
+ saved_hardlinks_created = new;
}
file_header->device = makedev(major, minor);
if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
archive_handle->action_data(archive_handle);
- archive_handle->action_header(archive_handle->file_header);
+ archive_handle->action_header(file_header);
} else {
data_skip(archive_handle);
}
archive_handle->offset += file_header->size;
free(file_header->link_target);
+ free(file_header->name);
+ file_header->link_target = NULL;
+ file_header->name = NULL;
return EXIT_SUCCESS;
+
+ create_hardlinks:
+ free(file_header->link_target);
+ free(file_header->name);
+
+ while (saved_hardlinks) {
+ hardlinks_t *cur;
+ hardlinks_t *make_me = saved_hardlinks;
+ saved_hardlinks = make_me->next;
+
+ memset(file_header, 0, sizeof(*file_header));
+ file_header->name = make_me->name;
+ file_header->mode = make_me->mode;
+ /*file_header->size = 0;*/
+
+ /* Try to find a file we are hardlinked to */
+ cur = saved_hardlinks_created;
+ while (cur) {
+ /* TODO: must match maj/min too! */
+ if (cur->inode == make_me->inode) {
+ file_header->link_target = cur->name;
+ /* link_target != NULL, size = 0: "I am a hardlink" */
+ if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
+ archive_handle->action_data(archive_handle);
+ free(make_me);
+ goto next_link;
+ }
+ }
+ /* Oops... no file with such inode was created... do it now
+ * (happens when hardlinked files are empty (zero length)) */
+ file_header->mtime = make_me->mtime;
+ file_header->uid = make_me->uid ;
+ file_header->gid = make_me->gid ;
+ if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
+ archive_handle->action_data(archive_handle);
+ /* Move to the list of created hardlinked files */
+ make_me->next = saved_hardlinks_created;
+ saved_hardlinks_created = make_me;
+ next_link: ;
+ }
+
+ while (saved_hardlinks_created) {
+ hardlinks_t *p = saved_hardlinks_created;
+ saved_hardlinks_created = p->next;
+ free(p);
+ }
+
+ return EXIT_FAILURE; /* "No more files to process" */
}
projects / oweals / busybox.git / commitdiff