mirror of
https://github.com/Llewellynvdm/Tomb.git
synced 2024-12-22 10:08:58 +00:00
refactor of state tracking for loop mounting
simplified function calls for tracking of loop mount by using global variables whose scope is limited to execution, most computation is now included in the `is_valid_tomb` function.
This commit is contained in:
Jaromil
parent
940563d02c
commit
3fb248bde8
216
tomb
216
tomb
@ -257,33 +257,6 @@ _whoami() {
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}
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# Define sepulture's plot (setup tomb-related arguments)
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# Synopsis: _plot /path/to/the.tomb
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# Set TOMB{PATH,DIR,FILE,NAME}
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_plot() {
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# We set global variables
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typeset -g TOMBPATH TOMBDIR TOMBFILE TOMBNAME
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TOMBPATH="$1"
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TOMBDIR=$(dirname $TOMBPATH)
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TOMBFILE=$(basename $TOMBPATH)
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# The tomb name is TOMBFILE without an extension and underscores instead of spaces (for mount and cryptsetup)
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# It can start with dots: ..foo bar baz.tomb -> ..foo_bar_baz
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TOMBNAME=${${TOMBFILE// /_}%.*}
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# use the entire filename if the previous transformation returns
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# an empty string. This handles the corner case of tomb being
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# hidden files (starting with a dot) and have no extension (only
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# one dot in string)
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TOMBNAME=${TOMBNAME:-${TOMBFILE}}
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[[ "$TOMBNAME" = "" ]] &&
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_failure "Tomb won't work without a TOMBNAME."
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}
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# Provide a random filename in shared memory
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_tmp_create() {
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[[ -d "$TMPPREFIX" ]] || {
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@ -567,97 +540,90 @@ sphinx_set_password() {
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fi
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}
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# Check if a filename is a valid tomb
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is_valid_tomb() {
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_verbose "is_valid_tomb ::1 tomb file::" $1
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local tombpath=$1
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_verbose "is_valid_tomb ::1 tomb file::" $tombpath
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# First argument must be the path to a tomb
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[[ -z "$1" ]] && {
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[[ -z "$tombpath" ]] && {
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_failure "Tomb file is missing from arguments." }
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_fail=0
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# Tomb file must be a readable, writable, non-empty regular file.
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# If passed the "ro" mount option, the writable check is skipped.
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[[ ! -w "$1" ]] && [[ $(option_value -o) != *"ro"* ]] && {
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_warning "Tomb file is not writable: ::1 tomb file::" $1
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[[ ! -w "$tombpath" ]] && [[ $(option_value -o) != *"ro"* ]] && {
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_warning "Tomb file is not writable: ::1 tomb file::" $tombpath
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_fail=1
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}
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_verbose "tomb file is readable"
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[[ ! -f "$1" ]] && {
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_warning "Tomb file is not a regular file: ::1 tomb file::" $1
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[[ ! -f "$tombpath" ]] && {
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_warning "Tomb file is not a regular file: ::1 tomb file::" $tombpath
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_fail=1
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}
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_verbose "tomb file is a regular file"
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[[ ! -s "$1" ]] && {
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_warning "Tomb file is empty (zero length): ::1 tomb file::" $1
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[[ ! -s "$tombpath" ]] && {
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_warning "Tomb file is empty (zero length): ::1 tomb file::" $tombpath
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_fail=1
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}
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_verbose "tomb file is not empty"
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# no more checking on the uid
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# _uid="`zstat +uid $1`"
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# [[ "$_uid" = "$UID" ]] || {
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# _user="`zstat -s +uid $1`"
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# _warning "Tomb file is owned by another user: ::1 tomb owner::" $_user
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# }
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# _verbose "tomb is not owned by another user"
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[[ $_fail = 1 ]] && {
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_failure "Tomb command failed: ::1 command name::" $subcommand
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}
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# TODO: split the rest of that function out.
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# We already have a valid tomb, now we're checking
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# whether we can alter it.
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# Tomb file may be a LUKS FS (or we are creating it)
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[[ "`file $1`" =~ "luks encrypted file" ]] || {
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_warning "File is not yet a tomb: ::1 tomb file::" $1 }
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[[ "`file $tombpath`" =~ "luks encrypted file" ]] || {
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_warning "File is not yet a tomb: ::1 tomb file::" $tombpath }
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_plot $1 # Set TOMB{PATH,DIR,FILE,NAME}
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# We set global variables
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typeset -g TOMBPATH TOMBDIR TOMBFILE TOMBNAME TOMBMAPPER
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# Tomb already mounted (or we cannot alter it)
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[[ "`_sudo findmnt -rvo SOURCE,TARGET,FSTYPE,OPTIONS,LABEL |
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awk -vtomb="[$TOMBNAME]" '
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/^\/dev\/mapper\/tomb/ { if($5==tomb) print $1 }'`" = "" ]] || {
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_failure "Tomb is currently in use: ::1 tomb name::" $TOMBNAME
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}
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_verbose "tomb file is not currently in use"
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TOMBPATH="$1"
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_message "Valid tomb file found: ::1 tomb path::" $TOMBPATH
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TOMBDIR=$(dirname $TOMBPATH)
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return 0
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}
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TOMBFILE=$(basename $TOMBPATH)
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# render the path to the unique /dev/mapper using an hash of the path
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# of the tombfile and its name. Checks for duplicates (tomb is in use)
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render_mapper() {
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[[ "$tombpath" == "" ]] &&
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_failure "cannot render mapper: missing \$tombpath"
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[[ "$TOMBNAME" == "" ]] &&
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_failure "cannot render mapper: missing \$TOMBNAME"
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# The tomb name is TOMBFILE without an extension and underscores instead of spaces (for mount and cryptsetup)
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# It can start with dots: ..foo bar baz.tomb -> ..foo_bar_baz
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TOMBNAME=${${TOMBFILE// /_}%.*}
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# use the entire filename if the previous transformation returns
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# an empty string. This handles the corner case of tomb being
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# hidden files (starting with a dot) and have no extension (only
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# one dot in string)
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TOMBNAME=${TOMBNAME:-${TOMBFILE}}
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[[ "$TOMBNAME" = "" ]] &&
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_failure "Tomb won't work without a TOMBNAME."
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# checks if Tomb already mounted (or we cannot alter it)
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local maphash=`realpath $tombpath | sha256sum -z`
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mapper="tomb.$TOMBNAME.${maphash[(w)1]}.loop"
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local nextloop=`losetup -f`
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TOMBMAPPER="tomb.$TOMBNAME.${maphash[(w)1]}.`basename $nextloop`"
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local mounted_tombs=(`list_tomb_mounts`)
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local usedmapper
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for t in ${mounted_tombs}; do
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usedmapper=`basename "${t[(ws:;:)1]}"`
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[[ "$usedmapper" == "$mapper" ]] &&
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_failure "Tomb file already in use: ::1 tombname::" $TOMBNAME
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[[ "${usedmapper%.*}" == "${TOMBMAPPER%.*}" ]] &&
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_failure "Tomb file already in use: ::1 tombname::" $TOMBPATH
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done
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_verbose "Mapper: ::1 mapper::" $mapper
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print "$mapper"
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_verbose "Mapper: ::1 mapper::" $TOMBMAPPER
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_verbose "tomb file is not currently in use"
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_message "Valid tomb file found: ::1 tomb path::" $TOMBPATH
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return 0
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}
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# $1 is the tomb file to be lomounted
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lo_mount() {
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tpath="$1"
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# check if we have support for loop mounting
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_nstloop=`_sudo losetup -f`
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TOMBLOOP=`_sudo losetup -f`
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[[ $? = 0 ]] || {
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_warning "Loop mount of volumes is not possible on this machine, this error"
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_warning "often occurs on VPS and kernels that don't provide the loop module."
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@ -667,8 +633,7 @@ lo_mount() {
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_sudo losetup -f "$tpath" # allocates the next loopback for our file
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TOMBLOOPDEVS+=("$_nstloop") # add to array of lodevs used
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TOMBLOOPDEVS+=("$TOMBLOOP") # add to array of lodevs used
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return 0
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}
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@ -1876,7 +1841,7 @@ dig_tomb() {
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[[ $tombsize == <-> ]] || _failure "Size must be an integer (mebibytes)"
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[[ $tombsize -ge 10 ]] || _failure "Tombs can't be smaller than 10 mebibytes"
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_plot $tombpath # Set TOMB{PATH,DIR,FILE,NAME}
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is_valid_tomb $tombpath
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[[ -e $TOMBPATH ]] && {
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_warning "A tomb exists already. I'm not digging here:"
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@ -2043,7 +2008,8 @@ lock_tomb_with_key() {
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return 1
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}
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_plot $tombpath
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is_valid_tomb $tombpath
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_message "Commanded to lock tomb ::1 tomb file::" $TOMBFILE
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@ -2053,12 +2019,11 @@ lock_tomb_with_key() {
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_verbose "Tomb found: ::1 tomb path::" $TOMBPATH
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lo_mount $TOMBPATH
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nstloop=`lo_new`
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_verbose "Loop mounted on ::1 mount point::" $nstloop
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_verbose "Loop mounted on ::1 mount point::" $TOMBLOOP
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_message "Checking if the tomb is empty (we never step on somebody else's bones)."
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_sudo cryptsetup isLuks ${nstloop}
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_sudo cryptsetup isLuks ${TOMBLOOP}
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if [ $? = 0 ]; then
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# is it a LUKS encrypted nest? then bail out and avoid reformatting it
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_warning "The tomb was already locked with another key."
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@ -2089,12 +2054,12 @@ lock_tomb_with_key() {
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_message "Formatting Luks mapped device."
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_cryptsetup --batch-mode \
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--cipher ${cipher} --hash sha512 --key-size 512 --key-slot 0 \
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luksFormat ${nstloop}
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luksFormat ${TOMBLOOP}
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[[ $? == 0 ]] || {
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_warning "cryptsetup luksFormat returned an error."
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_failure "Operation aborted." }
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_cryptsetup --cipher ${cipher} --hash sha512 luksOpen ${nstloop} tomb.tmp
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_cryptsetup --cipher ${cipher} --hash sha512 luksOpen ${TOMBLOOP} tomb.tmp
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[[ $? == 0 ]] || {
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_warning "cryptsetup luksOpen returned an error."
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_failure "Operation aborted." }
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@ -2130,20 +2095,17 @@ change_tomb_key() {
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_check_swap
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# this also calls _plot()
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is_valid_tomb $tombpath
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lo_mount $TOMBPATH
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nstloop=`lo_new`
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_sudo cryptsetup isLuks ${nstloop}
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_sudo cryptsetup isLuks ${TOMBLOOP}
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# is it a LUKS encrypted nest? we check one more time
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[[ $? == 0 ]] || {
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_failure "Not a valid LUKS encrypted volume: ::1 volume::" $TOMBPATH }
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_load_key $tombkey # Try loading given key and set TOMBKEY
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mapper=`render_mapper`
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[[ "$mapper" == "" ]] && _failure "Operation aborted."
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# TOMBKEYFILE
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local oldkey=$TOMBKEY
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@ -2167,7 +2129,7 @@ change_tomb_key() {
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# luksOpen the tomb (not really mounting, just on the loopback)
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print -R -n - "$old_secret" | _sudo cryptsetup --key-file - \
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luksOpen ${nstloop} ${mapper}
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luksOpen ${TOMBLOOP} ${TOMBMAPPER}
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[[ $? == 0 ]] || _failure "Unexpected error in luksOpen."
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_load_key # Try loading new key from option -k and set TOMBKEYFILE
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@ -2189,11 +2151,11 @@ change_tomb_key() {
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print -R -n - "$TOMBSECRET" >> $tmpnewkey
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print -R -n - "$old_secret" | _sudo cryptsetup --key-file - \
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luksChangeKey "$nstloop" "$tmpnewkey"
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luksChangeKey "$TOMBLOOP" "$tmpnewkey"
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[[ $? == 0 ]] || _failure "Unexpected error in luksChangeKey."
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_sudo cryptsetup luksClose "${mapper}" || _failure "Unexpected error in luksClose."
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_sudo cryptsetup luksClose "${TOMBMAPPER}" || _failure "Unexpected error in luksClose."
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_success "Succesfully changed key for tomb: ::1 tomb file::" $TOMBFILE
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_message "The new key is: ::1 new key::" $TOMBKEYFILE
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@ -2220,23 +2182,18 @@ _update_control_file() {
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# $1 = tombfile $2(optional) = mountpoint
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mount_tomb() {
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local tombpath="$1" # First argument is the path to the tomb
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[[ -n "$tombpath" ]] || _failure "No tomb name specified for opening."
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[[ -n "$1" ]] || _failure "No tomb name specified for opening."
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_message "Commanded to open tomb ::1 tomb name::" $tombpath
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_message "Commanded to open tomb ::1 tomb name::" $1
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_check_swap
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# this also calls _plot()
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is_valid_tomb $tombpath
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is_valid_tomb $1
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_track_stat "$tombpath"
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_track_stat "$TOMBPATH"
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_load_key # Try loading new key from option -k and set TOMBKEYFILE
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mapper=`render_mapper`
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[[ "$mapper" == "" ]] && _failure "Operation aborted."
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tombmount="$2"
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[[ "$tombmount" = "" ]] && {
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tombmount=/media/$TOMBNAME
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@ -2257,15 +2214,14 @@ mount_tomb() {
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done
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lo_mount $TOMBPATH
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nstloop=`lo_new`
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_sudo cryptsetup isLuks ${nstloop} || {
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_sudo cryptsetup isLuks ${TOMBLOOP} || {
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# is it a LUKS encrypted nest? see cryptsetup(1)
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_failure "::1 tomb file:: is not a valid Luks encrypted storage file." $TOMBFILE }
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_message "This tomb is a valid LUKS encrypted device."
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luksdump="`_sudo cryptsetup luksDump ${nstloop}`"
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luksdump="`_sudo cryptsetup luksDump ${TOMBLOOP}`"
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tombdump=(`print $luksdump | awk '
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/^Cipher name/ {print $3}
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/^Cipher mode/ {print $3}
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@ -2293,15 +2249,15 @@ mount_tomb() {
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}
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[[ $? == 0 ]] || _failure "No valid password supplied."
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_cryptsetup luksOpen ${nstloop} ${mapper}
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_cryptsetup luksOpen ${TOMBLOOP} ${TOMBMAPPER}
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[[ $? = 0 ]] || {
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_failure "Failure mounting the encrypted file." }
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# preserve the loopdev after exit
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lo_preserve "$nstloop"
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lo_preserve "$TOMBLOOP"
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# array: [ cipher, keysize, loopdevice ]
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tombstat=(`_sudo cryptsetup status ${mapper} | awk '
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tombstat=(`_sudo cryptsetup status ${TOMBMAPPER} | awk '
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/cipher:/ {print $2}
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/keysize:/ {print $2}
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/device:/ {print $2}'`)
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@ -2309,9 +2265,9 @@ mount_tomb() {
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_verbose "Key size is ::1 size:: for cipher ::2 cipher::" $tombstat[2] $tombstat[1]
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_message "Checking filesystem via ::1::" $tombstat[3]
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_sudo fsck -p -C0 /dev/mapper/${mapper}
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_sudo fsck -p -C0 /dev/mapper/${TOMBMAPPER}
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_verbose "Tomb engraved as ::1 tomb name::" $TOMBNAME
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_sudo tune2fs -L $TOMBNAME /dev/mapper/${mapper} > /dev/null
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_sudo tune2fs -L $TOMBNAME /dev/mapper/${TOMBMAPPER} > /dev/null
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# we need root from here on
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_sudo mkdir -p $tombmount
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@ -2322,15 +2278,15 @@ mount_tomb() {
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MOUNTOPTS="$(option_value -o)" }
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# TODO: safety check MOUNTOPTS
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# safe_mount_options &&
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_sudo mount -o $MOUNTOPTS /dev/mapper/${mapper} ${tombmount}
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_sudo mount -o $MOUNTOPTS /dev/mapper/${TOMBMAPPER} ${tombmount}
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# Clean up if the mount failed
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[[ $? == 0 ]] || {
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_warning "Error mounting ::1 mapper:: on ::2 tombmount::" $mapper $tombmount
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_warning "Error mounting ::1 mapper:: on ::2 tombmount::" $TOMBMAPPER $tombmount
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[[ $oldmountopts != $MOUNTOPTS ]] && \
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_warning "Are mount options '::1 mount options::' valid?" $MOUNTOPTS
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# TODO: move cleanup to _endgame()
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[[ -d $tombmount ]] && _sudo rmdir $tombmount
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[[ -e /dev/mapper/$mapper ]] && _sudo cryptsetup luksClose $mapper
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[[ -e /dev/mapper/$TOMBMAPPER ]] && _sudo cryptsetup luksClose $TOMBMAPPER
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# The loop is taken care of in _endgame()
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_failure "Cannot mount ::1 tomb name::" $TOMBNAME
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}
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@ -2470,7 +2426,7 @@ exec_safe_func_hooks() {
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# here call two actions: open or close. Synopsis:
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# $1 $2 $3 $4 $5
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# open "$tombmount"
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# close "$tombmount" "$tombname" "$tombloop" "$mapper"
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# close "$tombmount" "$tombname" "$tombloop" "$TOMBMAPPER"
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$mnt/exec-hooks "$1" "$2" "$3" "$4" "$5"
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return $?
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}
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@ -2502,7 +2458,7 @@ list_tombs() {
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tombloop=${mapper[(ws:.:)4]}
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# calculate tomb size
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ts=`df -hP /dev/mapper/$mapper |
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ts=`df -hP /dev/mapper/$TOMBMAPPER |
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awk "/mapper/"' { print $2 ";" $3 ";" $4 ";" $5 }'`
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tombtot=${ts[(ws:;:)1]}
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tombused=${ts[(ws:;:)2]}
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@ -2803,8 +2759,8 @@ resize_tomb() {
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_message "Commanded to resize tomb ::1 tomb name:: to ::2 size:: mebibytes." $1 $OPTS[-s]
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[[ -z "$tombpath" ]] && _failure "No tomb name specified for resizing."
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[[ ! -r $tombpath ]] && _failure "Cannot find ::1::" $tombpath
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[[ -z "$1" ]] && _failure "No tomb name specified for resizing."
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[[ ! -r "$1" ]] && _failure "Cannot find ::1::" $1
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newtombsize="`option_value -s`"
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[[ -z "$newtombsize" ]] && {
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@ -2815,9 +2771,6 @@ resize_tomb() {
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_load_key # Try loading new key from option -k and set TOMBKEYFILE
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|
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mapper=`render_mapper`
|
||||
[[ "$mapper" == "" ]] && _failure "Operation aborted."
|
||||
|
||||
if option_is_set --tomb-pwd; then
|
||||
tomb_pwd="`option_value --tomb-pwd`"
|
||||
_verbose "tomb-pwd = ::1 tomb pass::" $tomb_pwd
|
||||
@ -2858,23 +2811,22 @@ resize_tomb() {
|
||||
fi
|
||||
|
||||
lo_mount "$TOMBPATH"
|
||||
nstloop=`lo_new`
|
||||
|
||||
_message "opening tomb"
|
||||
_cryptsetup luksOpen ${nstloop} ${mapper} || {
|
||||
_cryptsetup luksOpen ${TOMBLOOP} ${TOMBMAPPER} || {
|
||||
_failure "Failure mounting the encrypted file." }
|
||||
|
||||
_sudo cryptsetup resize "${mapper}" || {
|
||||
_failure "cryptsetup failed to resize ::1 mapper::" $mapper }
|
||||
_sudo cryptsetup resize "${TOMBMAPPER}" || {
|
||||
_failure "cryptsetup failed to resize ::1 mapper::" $TOMBMAPPER }
|
||||
|
||||
_sudo e2fsck -p -f /dev/mapper/${mapper} || {
|
||||
_failure "e2fsck failed to check ::1 mapper::" $mapper }
|
||||
_sudo e2fsck -p -f /dev/mapper/${TOMBMAPPER} || {
|
||||
_failure "e2fsck failed to check ::1 mapper::" $TOMBMAPPER }
|
||||
|
||||
_sudo resize2fs /dev/mapper/${mapper} || {
|
||||
_failure "resize2fs failed to resize ::1 mapper::" $mapper }
|
||||
_sudo resize2fs /dev/mapper/${TOMBMAPPER} || {
|
||||
_failure "resize2fs failed to resize ::1 mapper::" $TOMBMAPPER }
|
||||
|
||||
# close and free the loop device
|
||||
_sudo cryptsetup luksClose "${mapper}"
|
||||
_sudo cryptsetup luksClose "${TOMBMAPPER}"
|
||||
|
||||
return 0
|
||||
}
|
||||
@ -2915,16 +2867,16 @@ umount_tomb() {
|
||||
_verbose "Name: ::1 tomb name::" $tombname
|
||||
_verbose "Mount: ::1 mount point::" $tombmount
|
||||
_verbose "Loop: ::1 mount loop::" $tombloop
|
||||
_verbose "Mapper: ::1 mapper::" $mapper
|
||||
_verbose "Mapper: ::1 mapper::" $TOMBMAPPER
|
||||
|
||||
[[ -e "$mapper" ]] && {
|
||||
[[ -e "$TOMBMAPPER" ]] && {
|
||||
_warning "Tomb not found: ::1 tomb file::" $1
|
||||
_warning "Please specify an existing tomb."
|
||||
return 0 }
|
||||
|
||||
option_is_set -n || {
|
||||
exec_safe_func_hooks \
|
||||
close "$tombmount" "$tombname" "$tombloop" "$mapper"
|
||||
close "$tombmount" "$tombname" "$tombloop" "$TOMBMAPPER"
|
||||
exec_hook_res=$?
|
||||
[[ $exec_hook_res = 0 ]] || {
|
||||
_warning "close exec-hook returns a non-zero error code: ::1 error::" $exec_hook_res
|
||||
@ -2972,8 +2924,8 @@ umount_tomb() {
|
||||
[[ "$tombmount" =~ "(/run)?/media(/$_USER)?/$tombname_regex" ]] && {
|
||||
_sudo rmdir $tombmount }
|
||||
|
||||
_sudo cryptsetup luksClose $mapper ||
|
||||
_failure "Error occurred in cryptsetup luksClose ::1 mapper::" $mapper
|
||||
_sudo cryptsetup luksClose $TOMBMAPPER ||
|
||||
_failure "Error occurred in cryptsetup luksClose ::1 mapper::" $TOMBMAPPER
|
||||
|
||||
# Normally the loopback device is detached when unused
|
||||
[[ -e "/dev/$tombloop" ]] && {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user