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Generate default fake "device" and "inode" numbers for entries

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extracted from tar archives.  Otherwise, converting tar archives to
cpio format (with "bsdtar -cf out.cpio @in.tar") convert every entry
into a hard link to a single file.  This simple logic breaks hard
links, but that's better than the alternative.

MFC after: 7 days
This commit is contained in:
Tim Kientzle 2005-08-02 03:17:57 +00:00
parent 0f61624bd1
commit 01122e2ae0
1 changed files with 25 additions and 0 deletions
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25
lib/libarchive/archive_read_support_format_tar.c
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@ -361,6 +361,22 @@ static int
archive_read_format_tar_read_header(struct archive *a,
struct archive_entry *entry)
{
/*
* When converting tar archives to cpio archives, it is
* essential that each distinct file have a distinct inode
* number. To simplify this, we keep a static count here to
* assign fake dev/inode numbers to each tar entry. Note that
* pax format archives may overwrite this with something more
* useful.
*
* Ideally, we would track every file read from the archive so
* that we could assign the same dev/ino pair to hardlinks,
* but the memory required to store a complete lookup table is
* probably not worthwhile just to support the relatively
* obscure tar->cpio conversion case.
*/
static int default_inode;
static int default_dev;
struct stat st;
struct tar *tar;
const char *p;
@ -368,6 +384,15 @@ archive_read_format_tar_read_header(struct archive *a,
size_t l;
memset(&st, 0, sizeof(st));
/* Assign default device/inode values. */
st.st_dev = 1 + default_dev; /* Don't use zero. */
st.st_ino = ++default_inode; /* Don't use zero. */
/* Limit generated st_ino number to 16 bits. */
if (default_inode >= 0xffff) {
++default_dev;
default_inode = 0;
}
tar = *(a->pformat_data);
tar->entry_offset = 0;