After that I try to read/list the tar from tape with tar -t:
$ sudo tar -tf /dev/sa0
archive.dmp
tar: Unrecognized archive format: Inappropriate file type or format
But when I extract the archive from tape, it works perfectly:
$ sudo tar -xvf /dev/sa0
Please try the most recent -STABLE version of libarchive
and bsdtar, with the attached patch.
This simply disables the skip optimization when
reading archives from character or block
devices.
Tim Kientzle
Index: archive_read_open_filename.c
===================================================================
--- archive_read_open_filename.c (revision 124)
+++ archive_read_open_filename.c (working copy)
@@ -165,6 +165,15 @@
struct read_file_data *mine = (struct read_file_data *)client_data;
off_t old_offset, new_offset;
+ /*
+ * Workaround for broken tape interfaces that don't support
+ * seek(), but return success if you ask them to seek(). This
+ * also, of course, slows down archive scanning significantly
+ * on devices that can seek. Yuck.
+ */
+ if (S_ISCHR(mine->st_mode) || S_ISBLK(mine->st_mode))
+ return (0);
+
/* Reduce request to the next smallest multiple of block_size */
request = (request / mine->block_size) * mine->block_size;
/*
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