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Go Back   Linux Archive > ArchLinux > ArchLinux General Discussion

 
 
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Old 06-30-2010, 09:47 PM
Victor Lowther
 
Default Rewrite /etc/crypttab processing.

Split out reading /etc/crypttab and procssing the individual lines into
their own helper functions, and bashify the resulting shorter code.

Processing this file is still ugly, though.
---
functions | 43 +++++++++++++++++--
rc.shutdown | 36 +++++------------
rc.sysinit | 131 ++++++++++++++++++----------------------------------------
3 files changed, 90 insertions(+), 120 deletions(-)

diff --git a/functions b/functions
index bf6ed45..9ec8b5e 100644
--- a/functions
+++ b/functions
@@ -232,6 +232,40 @@ kill_everything() {
run_hook single_postkillall
}

+activate_vgs() {
+ [[ $USELVM =~ yes|YES && -x /sbin/lvm && -d /sys/block ]] || return
+ # Kernel 2.6.x, LVM2 groups
+ /sbin/modprobe -q dm-mod 2>/dev/null
+ stat_busy "Activating LVM2 groups"
+ if /sbin/lvm vgchange --ignorelockingfailure -a y >/dev/null; then
+ stat_done
+ else
+ stat_fail
+ fi
+}
+
+# Arch cryptsetup packages traditionally contained the binaries
+# /usr/sbin/cryptsetup
+# /sbin/cryptsetup.static
+# By default, initscripts used the /sbin/cryptsetup.static.
+# Newer packages will only have /sbin/cryptsetup and no static binary
+# This ensures maximal compatibility with the old and new layout
+for CS in /sbin/cryptsetup /usr/sbin/cryptsetup
+ /sbin/cryptsetup.static '; do
+ [[ -x $CS ]] && break
+done
+
+read_crypttab() {
+ # $1 = function to call with the split out line from the crypttab
+ local line nspo failed=0
+ while read line; do
+ [[ $line && ${line:0:1} != '#' ]] || continue
+ eval nspo=("${line%#*}")
+ $1 "${nspo[@]}" || failed=1
+ done < /etc/crypttab
+ return $failed
+}
+
###############################
# Custom hooks in initscripts #
###############################
@@ -278,7 +312,7 @@ run_hook() {
[[ $1 ]] || return 1
local func
for func in ${hook_funcs["$1"]}; do
- "${func}"
+ q"${func}"
done
}

@@ -293,13 +327,14 @@ set_consolefont() {
for i in /dev/tty[0-9]*; do
/usr/bin/setfont ${CONSOLEMAP:+-m ${CONSOLEMAP}}
$CONSOLEFONT -C ${i} >/dev/null 2>&1
- done
+ done
if (($? != 0)); then
stat_fail
elif [[ $CONSOLEMAP ]]; then
cat <<"EOF" >>/etc/profile.d/locale.sh
-if [ "$CONSOLE" = "" -a "$TERM" = "linux" -a -t 1 ]; then printf "33(K"; fi
-
+if [ "$CONSOLE" = "" -a "$TERM" = "linux" -a -t 1 ]
+ then printf "33(K"
+fi
EOF
stat_done
fi
diff --git a/rc.shutdown b/rc.shutdown
index e823ed2..1081970 100755
--- a/rc.shutdown
+++ b/rc.shutdown
@@ -65,33 +65,17 @@ stat_busy "Unmounting Filesystems"
stat_done

# Kill non-root encrypted partition mappings
-if [[ -f /etc/crypttab ]]; then
+if [[ -f /etc/crypttab && $CS ]]; then
stat_busy "Deactivating encrypted volumes:"
- # Arch cryptsetup packages traditionally contained the binaries
- # /usr/sbin/cryptsetup
- # /sbin/cryptsetup.static
- # By default, initscripts used the /sbin/cryptsetup.static.
- # Newer packages will only have /sbin/cryptsetup and no static binary
- # This ensures maximal compatibility with the old and new layout
- for CS in /sbin/cryptsetup /usr/sbin/cryptsetup
- /sbin/cryptsetup.static '; do
- [[ -x $CS ]] && break
- done
- if [[ ! $CS ]]; then
- stat_append " Failed, unable to find cryptsetup."
- stat_fail
- else
- while read name src passwd opts; do
- [[ ! $name || ${name:0:1} = '#']] && continue
- [[ -b /dev/mapper/$name ]] || continue
- stat_append "${1}.."
- if "$CS" remove "$name" >/dev/null 2>&1; then
- stat_append "ok "
- else
- stat_append "failed "
- fi
- done </etc/crypttab
- fi
+ do_lock() {
+ stat_append "${1}.."
+ if $CS remove "$1" >/dev/null 2>&1; then
+ stat_append "ok "
+ else
+ stat_append "failed "
+ fi
+ }
+ read_crypttab do_lock
stat_done
fi

diff --git a/rc.sysinit b/rc.sysinit
index 404e11a..d54b9bb 100755
--- a/rc.sysinit
+++ b/rc.sysinit
@@ -127,104 +127,55 @@ if [[ -f /etc/mdadm.conf ]] && /bin/grep -q ^ARRAY /etc/mdadm.conf; then
status "Activating RAID arrays" /sbin/mdadm --assemble --scan
fi

-if [ "$USELVM" = "yes" -o "$USELVM" = "YES" ]; then
- if [ -x /sbin/lvm -a -d /sys/block ]; then
- # Kernel 2.6.x, LVM2 groups
- /sbin/modprobe -q dm-mod 2>/dev/null
- stat_busy "Activating LVM2 groups"
- /sbin/lvm vgchange --ignorelockingfailure -a y >/dev/null
- if [ $? -ne 0 ]; then
- stat_fail
- else
- stat_done
- fi
- fi
-fi
+activate_vgs

# Set up non-root encrypted partition mappings
-if [ -f /etc/crypttab -a -n "$(/bin/grep -v ^# /etc/crypttab | /bin/grep -v ^$)" ]; then
- /sbin/modprobe -q dm-mod 2>/dev/null
+if [[ -f /etc/crypttab && $CS ]]; then
+ /sbin/modprobe -q dm-crypt 2>/dev/null
stat_busy "Unlocking encrypted volumes:"
- csfailed=0
- # Arch cryptsetup packages traditionally contained the binaries
- # /usr/sbin/cryptsetup
- # /sbin/cryptsetup.static
- # By default, initscripts used the /sbin/cryptsetup.static.
- # Newer packages will only have /sbin/cryptsetup and no static binary
- # This ensures maximal compatibility with the old and new layout
- if [ -x /sbin/cryptsetup ]; then
- CS=/sbin/cryptsetup
- elif [ -x /usr/sbin/cryptsetup ]; then
- CS=/usr/sbin/cryptsetup
- else
- CS=/sbin/cryptsetup.static
- fi
- do_crypt() {
- if [ $# -ge 3 ]; then
- cname="$1"
- csrc="$2"
- cpass="$3"
- shift 3
- copts="$*"
- stat_append "${cname}.."
- # For some fun reason, the parameter ordering varies for
- # LUKS and non-LUKS devices. Joy.
- if [ "${cpass}" = "SWAP" ]; then
- # This is DANGEROUS! The only possible safety check
- # is to not proceed in case we find a LUKS device
- # This may cause dataloss if it is not used carefully
- if $CS isLuks $csrc 2>/dev/null; then
- false
- else
- $CS -d /dev/urandom $copts create $cname $csrc >/dev/null
- if [ $? -eq 0 ]; then
- stat_append "creating swapspace.."
- /sbin/mkswap -f -L $cname /dev/mapper/$cname >/dev/null
- fi
- fi
- elif [ "${cpass}" = "ASK" ]; then
- printf "
Opening '${cname}' volume:
"
-
- if $CS isLuks $csrc 2>/dev/null; then
- $CS $copts luksOpen $csrc $cname < /dev/console
- else
- $CS $copts create $cname $csrc < /dev/console
- fi
- elif [ "${cpass:0:1}" != "/" ]; then
- if $CS isLuks $csrc 2>/dev/null; then
- echo "$cpass" | $CS $copts luksOpen $csrc $cname >/dev/null
- else
- echo "$cpass" | $CS $copts create $cname $csrc >/dev/null
- fi
- else
- if $CS isLuks $csrc 2>/dev/null; then
- $CS -d $cpass $copts luksOpen $csrc $cname >/dev/null
- else
- $CS -d $cpass $copts create $cname $csrc >/dev/null
- fi
- fi
- if [ $? -ne 0 ]; then
- csfailed=1
- stat_append "failed "
- else
- stat_append "ok "
- fi
- fi
- }
- while read line; do
- eval do_crypt "$line"
- done </etc/crypttab
- if [ $csfailed -eq 0 ]; then
+ do_unlock() {
+ # $1 = requested name
+ # $2 = source device
+ # $3 = password
+ # $4 = options
+ local open=create a="$1" b="$2" failed=0
+ # Ordering of options is different if you are using LUKS vs. not.
+ # Use ugly swizzling to deal with it.
+ if $CS isLuks "$2"; then
+ open=luksOpen
+ a="$2"
+ b="$1"
+ fi
+ case $3 in
+ SWAP) if [[ $_isluks ]]; then
+ # This is DANGEROUS! The only possible safety check
+ # is to not proceed in case we find a LUKS device
+ # This may cause dataloss if it is not used carefully
+ false
+ elif $CS -d /dev/urandom $4 $open "$a" "$b" >/dev/null; then
+ stat_append "creating swapspace.."
+ /sbin/mkswap -f -L $1 /dev/mapper/$1 >/dev/null
+ fi;;
+ ASK) printf "
Opening '$1' volume:
"
+ $CS $4 $open "$a" "$b" < /dev/console;;
+ /*) $CS -d "$3" $4 $open "$a" "$b" >/dev/null;;
+ *) echo "$3" | $CS $4 $open "$a" "$b" >/dev/null;;
+ esac
+ if (($? != 0)); then
+ failed=1
+ stat_append "failed "
+ else
+ stat_append "ok "
+ fi
+ return $failed
+ }
+ if read_crypttab do_unlock; then
stat_done
else
stat_fail
fi
# Maybe someone has LVM on an encrypted block device
- if [ "$USELVM" = "yes" -o "$USELVM" = "YES" ]; then
- if [ -x /sbin/lvm -a -d /sys/block ]; then
- /sbin/lvm vgchange --ignorelockingfailure -a y >/dev/null
- fi
- fi
+ activate_vgs
fi

status "Mounting Root Read-only" /bin/mount -n -o remount,ro /
--
1.7.1
 

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