** Branch linked: lp:ubuntu/utopic-proposed/util-linux -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to util-linux in Ubuntu. https://bugs.launchpad.net/bugs/1047666
Title: mkswap does not wipe filesystem signatures Status in The Util-Linux-ng Set of Utilities: Fix Released Status in “util-linux” package in Ubuntu: Fix Committed Bug description: The mkswap utility does not always clean up signatures left by other filesystems. This results in multiple signatures reported by 'wipefs -n /path/to/swap/device' and prevents mountall from activating the swap device on boot (see bug #1047659). This bug has apparently been fixed in upstream util-linux 2.21 (which I have not tested). From <https://www.kernel.org/pub/linux/utils /util-linux/v2.21/v2.21-ReleaseNotes>: mkswap: - wipe all old signatures [Karel Zak] The following script reproduces the problem using a loopback device: ------------- #!/bin/sh log() { printf %s\\n "$*"; } error() { log "ERROR: $*" >&2; } fatal() { error "$*"; exit 1; } try() { "$@" || fatal "'$*' failed"; } # this script's name myname=$(try basename "$0") || exit 1 # temporary file for storing the swap partition FS=${myname}.tmpfs # which loopback device to use for ${FS} LOOP=/dev/loop0 command -v mkfs.ufs >/dev/null \ || fatal "mkfs.ufs not found; please install the ufsutils package" log "creating ${LOOP} using a temporary 128MiB file..." try dd if=/dev/zero of="${FS}" bs=1M count=128 2>/dev/null try losetup "${LOOP}" "${FS}" log "formatting ${LOOP} as UFS2..." try mkfs.ufs "${LOOP}" >/dev/null log "formatting ${LOOP} as swap..." try mkswap "${LOOP}" >/dev/null log "running 'wipefs -n ${LOOP}'..." try wipefs -n "${LOOP}" log "running 'blkid -p ${LOOP}'..." blkid -p "${LOOP}" log "cleaning up..." try losetup -d "${LOOP}" try rm "${FS}" ------------- Note how wipefs reports multiple filesystem signatures: offset type ---------------------------------------------------------------- 0x1055c ufs [filesystem] 0xff6 swap [other] UUID: 5ac922dc-3bc5-463f-a2e8-a692ee5c293a Also note how blkid does not list the UUID of the swap device. It prints this error message instead: ambivalent result (probably more filesystems on the device, use wipefs(8) to see more details) $ lsb_release -rd Description: Ubuntu 12.04.1 LTS Release: 12.04 $ apt-cache policy util-linux util-linux: Installed: 2.20.1-1ubuntu3 Candidate: 2.20.1-1ubuntu3 Version table: *** 2.20.1-1ubuntu3 0 500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages 100 /var/lib/dpkg/status $ apt-cache policy ufsutils ufsutils: Installed: 8.2-3 Candidate: 8.2-3 Version table: *** 8.2-3 0 500 http://us.archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages 100 /var/lib/dpkg/status To manage notifications about this bug go to: https://bugs.launchpad.net/util-linux-ng/+bug/1047666/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp