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Description: Detect old-style GNU headers correctly
Author: Steinar H. Gunderson <sesse@debian.org>
--- libtar-1.2.20.orig/lib/decode.c
+++ libtar-1.2.20/lib/decode.c
@@ -69,7 +69,14 @@ th_get_pathname(TAR *t)
return NULL;
}
- if (t->th_buf.prefix[0] == '\0')
+ /*
+ * Old GNU headers (also used by newer GNU tar when doing incremental
+ * dumps) use the POSIX prefix field for many other things, such as
+ * mtime and ctime. New-style GNU headers don't, but also don't use the
+ * POSIX prefix field. Thus, only honor the prefix field if the archive
+ * is actually a POSIX archive. This is the same logic as GNU tar uses.
+ */
+ if (strncmp(t->th_buf.magic, TMAGIC, TMAGLEN - 1) != 0 || t->th_buf.prefix[0] == '\0')
{
sprintf(t->th_pathname, "%.100s", t->th_buf.name);
}
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