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authorGlenn L McGrath2001-06-22 09:22:06 +0000
committerGlenn L McGrath2001-06-22 09:22:06 +0000
commit8f5b63edea12501b998400789da5646140bb9911 (patch)
tree5a1924092009892cc80f0b0947ec1bae17ca3b1c /libbb/unarchive.c
parent52a97ca00cf5d290c9beb65ba7c217a5ed69ee42 (diff)
downloadbusybox-8f5b63edea12501b998400789da5646140bb9911.zip
busybox-8f5b63edea12501b998400789da5646140bb9911.tar.gz
cpio applet, and changes to associated code
Diffstat (limited to 'libbb/unarchive.c')
-rw-r--r--libbb/unarchive.c85
1 files changed, 70 insertions, 15 deletions
diff --git a/libbb/unarchive.c b/libbb/unarchive.c
index 635dcae..20609de 100644
--- a/libbb/unarchive.c
+++ b/libbb/unarchive.c
@@ -119,10 +119,11 @@ char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *f
}
}
else if (function & extract_all_to_fs) {
-#if 0
struct stat oldfile;
- if ( (S_ISLNK(file_entry->mode) ? lstat (full_name, &oldfile) : stat (full_name, &oldfile)) == 0) { /* The file already exists */
- if (function & extract_unconditional || oldfile.st_mtime < file_entry->mtime) {
+ int stat_res;
+ stat_res = lstat (full_name, &oldfile);
+ if (stat_res == 0) { /* The file already exists */
+ if ((function & extract_unconditional) || (oldfile.st_mtime < file_entry->mtime)) {
if (!S_ISDIR(oldfile.st_mode)) {
unlink(full_name); /* Directories might not be empty etc */
}
@@ -134,7 +135,6 @@ char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *f
return (NULL);
}
}
-#endif
switch(file_entry->mode & S_IFMT) {
case S_IFREG:
if (file_entry->link_name) { /* Found a cpio hard link */
@@ -153,10 +153,11 @@ char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *f
}
break;
case S_IFDIR:
- /* Use make_directory instead of mkdir in case prefix path hasn't been created */
- if (function & extract_create_dirs) {
- if (make_directory(full_name, file_entry->mode, FILEUTILS_RECUR) < 0) {
- return NULL;
+ if ((function & extract_create_dirs) && (stat_res != 0)) {
+ /* Make sure the prefix component of full_name was create
+ * in applet before getting here*/
+ if (mkdir(full_name, file_entry->mode) < 0) {
+ perror_msg("extract_archive: ");
}
}
break;
@@ -335,14 +336,38 @@ void *get_header_ar(FILE *src_stream)
#endif
#ifdef L_get_header_cpio
+struct hardlinks {
+ file_header_t *entry;
+ int inode;
+ struct hardlinks *next;
+};
+
void *get_header_cpio(FILE *src_stream)
{
file_header_t *cpio_entry = NULL;
char cpio_header[110];
- char dummy[14];
int namesize;
- int major, minor, nlink;
-
+ char dummy[16];
+ int major, minor, nlink, inode;
+ static struct hardlinks *saved_hardlinks = NULL;
+ static int pending_hardlinks = 0;
+
+ if (pending_hardlinks) { /* Deal with any pending hardlinks */
+ struct hardlinks *tmp = saved_hardlinks, *oldtmp = NULL;
+ while (tmp) {
+ if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
+ cpio_entry = tmp->entry;
+ if (oldtmp) oldtmp->next = tmp->next; /* Remove item from linked list */
+ else saved_hardlinks = tmp->next;
+ free(tmp);
+ return (cpio_entry);
+ }
+ oldtmp = tmp;
+ tmp = tmp->next;
+ }
+ pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
+ }
+
/* There can be padding before archive header */
seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
if (fread(cpio_header, 1, 110, src_stream) == 110) {
@@ -356,8 +381,8 @@ void *get_header_cpio(FILE *src_stream)
/* Doesnt do the crc check yet */
case '1': /* "newc" header format */
cpio_entry = (file_header_t *) xcalloc(1, sizeof(file_header_t));
- sscanf(cpio_header, "%14c%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
- dummy, &cpio_entry->mode, &cpio_entry->uid, &cpio_entry->gid,
+ sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
+ dummy, &inode, &cpio_entry->mode, &cpio_entry->uid, &cpio_entry->gid,
&nlink, &cpio_entry->mtime, &cpio_entry->size,
dummy, &major, &minor, &namesize, dummy);
@@ -368,6 +393,19 @@ void *get_header_cpio(FILE *src_stream)
seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
if (strcmp(cpio_entry->name, "TRAILER!!!") == 0) {
printf("%d blocks\n", (int) (archive_offset % 512 ? (archive_offset / 512) + 1 : archive_offset / 512)); /* Always round up */
+ if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
+ struct hardlinks *tmp = saved_hardlinks, *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(NULL);
}
@@ -376,9 +414,26 @@ void *get_header_cpio(FILE *src_stream)
fread(cpio_entry->link_name, 1, cpio_entry->size, src_stream);
archive_offset += cpio_entry->size;
}
- if (nlink > 1 && !S_ISDIR(cpio_entry->mode) && cpio_entry->size == 0) {
- error_msg("%s not extracted: Cannot handle hard links yet", cpio_entry->name);
+ if (nlink > 1 && !S_ISDIR(cpio_entry->mode)) {
+ if (cpio_entry->size == 0) { /* Put file on a linked list for later */
+ struct hardlinks *new = xmalloc(sizeof(struct hardlinks));
+ new->next = saved_hardlinks;
+ new->inode = inode;
+ new->entry = cpio_entry;
+ saved_hardlinks = new;
return(get_header_cpio(src_stream)); /* Recurse to next file */
+ } else { /* Found the file with data in */
+ struct hardlinks *tmp = saved_hardlinks;
+ pending_hardlinks = 1;
+ while (tmp) {
+ if (tmp->inode == inode) {
+ tmp->entry->link_name = xstrdup(cpio_entry->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?");
+ }
}
cpio_entry->device = (major << 8) | minor;
break;