root@testjail:/ # rm /var/db/portsnap/tag && rm -rf /var/db/portsnap/files
root@testjail:/ # portsnap fetch
Looking up portsnap.FreeBSD.org mirrors... none found.
Fetching snapshot tag from portsnap.FreeBSD.org... done.
Fetching snapshot metadata... done.
Fetching snapshot generated at Thu Aug 15 00:01:56 UTC 2013:
2c54c444a74151dc873a72f8e09946632e60387bbef0a8100% of 69 MB 4988 kBps 00m00s
Extracting snapshot... done.
Verifying snapshot integrity... done.
Fetching snapshot tag from portsnap.FreeBSD.org... done.
Fetching snapshot metadata... done.
Updating from Thu Aug 15 00:01:56 UTC 2013 to Thu Aug 15 12:16:13 UTC 2013.
Fetching 3 metadata patches. done.
Applying metadata patches... done.
cut: /dev/stdin: No such file or directory
Fetching 0 metadata files... done.
Fetching 21 patches. done.
Applying patches... done.
cut: /dev/stdin: No such file or directory
Fetching 0 new ports or files... done.
root@testjail:/ # portsnap extract
.
.
.
.
.
/usr/ports/comms/qrq/
/usr/ports/comms/qsstv/
files/9758ee851ba3c88b4d1d64afe7a2e4ec6436b11c4897838eb6585a1ac33ace8d.gz not found -- snapshot corrupt.