/etc/schroot/setup.d/05btrfs is in schroot 1.6.10-4build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# Copyright © 2005-2010 Roger Leigh <rleigh@debian.org>
#
# schroot is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# schroot is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see
# <http://www.gnu.org/licenses/>.
#
#####################################################################
set -e
. "$SETUP_DATA_DIR/common-data"
. "$SETUP_DATA_DIR/common-functions"
. "$SETUP_DATA_DIR/common-config"
if [ "$CHROOT_TYPE" = "btrfs-snapshot" ]; then
if [ $STAGE = "setup-start" ]; then
if [ ! -d "$CHROOT_BTRFS_SOURCE_SUBVOLUME" ]; then
fatal "Btrfs source subvolume directory '$CHROOT_BTRFS_SOURCE_SUBVOLUME' does not exist"
fi
if [ ! -d "$CHROOT_BTRFS_SNAPSHOT_DIRECTORY" ]; then
fatal "Btrfs snapshot directory '$CHROOT_BTRFS_SNAPSHOT_DIRECTORY' does not exist"
fi
info "Creating snapshot $CHROOT_BTRFS_SNAPSHOT_NAME from subvolume $CHROOT_BTRFS_SOURCE_SUBVOLUME"
if [ "$VERBOSE" = "verbose" ]; then
btrfs subvolume snapshot "$CHROOT_BTRFS_SOURCE_SUBVOLUME" \
"$CHROOT_BTRFS_SNAPSHOT_NAME"
else
btrfs subvolume snapshot "$CHROOT_BTRFS_SOURCE_SUBVOLUME" \
"$CHROOT_BTRFS_SNAPSHOT_NAME" > /dev/null
fi
elif [ $STAGE = "setup-stop" ]; then
if [ -d "$CHROOT_BTRFS_SNAPSHOT_NAME" ]; then
info "Deleting snapshot $CHROOT_BTRFS_SNAPSHOT_NAME"
if [ "$VERBOSE" = "verbose" ]; then
btrfs subvolume delete "$CHROOT_BTRFS_SNAPSHOT_NAME" || true
else
btrfs subvolume delete "$CHROOT_BTRFS_SNAPSHOT_NAME" > /dev/null || true
fi
else
# The block device no longer exists, or was never created,
# for example on lvcreate failure.
warn "$CHROOT_BTRFS_SNAPSHOT_NAME does not exist (it may have been removed previously)"
fi
fi
fi
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