/usr/bin/ecryptfs-umount-private is in ecryptfs-utils 103-5+deb8u1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | #!/bin/sh -e
# This script unmounts a user's private ecryptfs folder
# and clears the kernel keyring of the relevant keys
#
# Original by Michael Halcrow, IBM
# Extracted to a stand-alone script by Dustin Kirkland <kirkland@ubuntu.com>
TEXTDOMAIN="ecryptfs-utils"
if grep -qs "$HOME/.Private $PWD ecryptfs " /proc/mounts 2>/dev/null; then
pwd_mounted=1
fi
if /sbin/umount.ecryptfs_private; then
for sig in `cat "$HOME/.ecryptfs/Private.sig"`; do
for key_id in `keyctl list @u | grep "$sig$" | awk -F: '{print $1}'`; do
keyctl unlink "$key_id" @u
done
done
if [ "$pwd_mounted" = "1" ]; then
echo
echo `gettext "INFO:"` `gettext "Your private directory has been unmounted."`
echo `gettext "INFO:"` `gettext "To see this change in your current shell:"`
echo " cd $PWD"
echo
fi
fi
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