Strange, the wrapper script didn't make it in to v3 of the patch. Here is v4.
diff -urN btrfs-progs-xnox/debian/btrfs-progs.examples btrfs-progs-sten/debian/btrfs-progs.examples --- btrfs-progs-xnox/debian/btrfs-progs.examples 1969-12-31 19:00:00.000000000 -0500 +++ btrfs-progs-sten/debian/btrfs-progs.examples 2016-05-28 20:07:20.909766909 -0400 @@ -0,0 +1 @@ +debian/local/btrfs-convert.hook diff -urN btrfs-progs-xnox/debian/local/btrfs-convert.hook btrfs-progs-sten/debian/local/btrfs-convert.hook --- btrfs-progs-xnox/debian/local/btrfs-convert.hook 1969-12-31 19:00:00.000000000 -0500 +++ btrfs-progs-sten/debian/local/btrfs-convert.hook 2016-05-28 20:07:55.477726627 -0400 @@ -0,0 +1,8 @@ +#!/bin/sh + +. /usr/share/initramfs-tools/hook-functions + +if command -v /bin/btrfs-convert >/dev/null 2>&1; then + copy_exec /bin/btrfs-convert bin/btrfs-convert + copy_exec /bin/btrfs-convert.real bin/btrfs-convert.real +fi diff -urN btrfs-progs-xnox/debian/local/btrfs-convert.wrapper btrfs-progs-sten/debian/local/btrfs-convert.wrapper --- btrfs-progs-xnox/debian/local/btrfs-convert.wrapper 1969-12-31 19:00:00.000000000 -0500 +++ btrfs-progs-sten/debian/local/btrfs-convert.wrapper 2016-05-28 20:08:19.741698356 -0400 @@ -0,0 +1,35 @@ +#!/bin/sh + +cat << !EOF! +******** WARNING ******** +Btrfs-convert is known to fail. An upstream rewrite of the +utility is currently in progress. At this point in time, +btrfs-convert is provided for experimental purposes only. + +Please do not convert filesystems filled with data you value. +Expect that you will need to restore from backup. Beware, +the dataloss may not be immediately apparent, and may take +some time to manifest. + +If you choose to experiment with btrfs-convert, please do so +with the willingness to work with linux-bt...@vger.kernel.org + +!EOF! +echo -n 'Proceed (Yes/No)?: ' + +while true; do + read -r choice + case "$choice" in + yes | y | Yes | YES ) + exec /bin/btrfs-convert.real "$@" + exit $? + ;; + no | n | No | NO ) + echo "Thank you for making the safe choice" + exit 0 + ;; + * ) + echo -n "Please answer Yes or No: " + ;; + esac +done diff -urN btrfs-progs-xnox/debian/rules btrfs-progs-sten/debian/rules --- btrfs-progs-xnox/debian/rules 2016-05-28 19:46:20.907183008 -0400 +++ btrfs-progs-sten/debian/rules 2016-05-28 20:07:20.909766909 -0400 @@ -28,6 +28,11 @@ install -D -m 0755 debian/local/btrfs.hook debian/btrfs-progs/usr/share/initramfs-tools/hooks/btrfs install -D -m 0755 debian/local/btrfs.local-premount debian/btrfs-progs/usr/share/initramfs-tools/scripts/local-premount/btrfs +# divert btrfs-convert to btrfs-convert.real +# and use a wrapper script to notify it is dangerous + mv debian/btrfs-progs/bin/btrfs-convert debian/btrfs-progs/bin/btrfs-convert.real + install -D -m 0755 debian/local/btrfs-convert.wrapper debian/btrfs-progs/bin/btrfs-convert + # Needs autopkgtest override_dh_auto_test:
