added snapshot comparison browse tool

diff --git a/ssbrowse.sh b/ssbrowse.sh
new file mode 100755 (executable)
index 0000000..82a7b37
--- /dev/null
+++ b/ssbrowse.sh
@@ -0,0 +1,90 @@
+#!/bin/bash
+#
+# Browse snapshots of a given path and run meld to compare with
+# current directory
+# $1: path -- into mounted nilfs
+# $2: [path] -- to compare with
+
+## Prepare for mounting of snapshots
+MOUNT=/tmp/ssmeld-$$
+mkdir -p $MOUNT || exit 1
+
+function exitbrowse() {
+    umount $MOUNT 2>/dev/null
+    rmdir -f $MOUNT
+    trap "" 0
+}
+trap "exitbrowse" 0 2 9 15
+
+DF=( $(df $1 | awk '{d=$1;p=$NF;} END {printf "%s %s", d, p;}') )
+
+NILFSROOT=${DF[1]}
+NILFSDEV=${DF[0]}
+PTR="${1#$NILFSROOT}"
+DIR0=$MOUNT$PTR
+DIR1=$NILFSROOT
+
+function snap2iselect() {
+    lscp -r -s $NILFSDEV  | while read CNO DATE TIME REST ; do
+       [ $CNO = CNO ] && continue
+       echo "  <s:$CNO> [$CNO] ${DATE} ${TIME}"
+    done
+}
+
+function dirof() {
+    x="${1%%|*}"
+    x="${x%%(*}"
+    echo "${x}" | sed 's/\(\S\+\s\+\)\{8\}//;s/\s*$//'
+}
+
+function dirsdiff() {
+    while true ; do
+       LEFT="$(cd $DIR0/${1#/} && ls -l)"
+       RIGHT="$(cd $DIR1/${1#/} && ls -l)"
+       SEL="$(diff -W 500 -y --left-column <(echo "$LEFT") <(echo "$RIGHT")| \
+            column -t | \
+            iselect -n "($CNO ~ $DIR1)" -K -kd -kx -kz -a -t "${1-/}" )"
+       KEY="${SEL%%:*}"
+       SEL="${SEL#*:}"
+       [ -z "$SEL" ] && break
+       case "$KEY" in
+           RETURN|KEY_RIGHT)
+               ZEL="$(echo "${SEL}" | sed 's/^>\s*//;s/\s*$//')"
+               if [ -z "${ZEL##d*}" ] ; then
+                   D="$(dirof "$ZEL")"
+                   dirsdiff "$1/$D" || return 1
+               else
+                   D="$(dirof "$ZEL")"
+                   diff -D "$CNO" -N $DIR0/${1#/}/$D $DIR1/${1#/}/$D |\
+                       less
+                        
+               fi
+               ;;
+           d) # Find next dept-first difference 
+               :
+               ;;
+           x) # Exit
+               return 1
+               ;;
+           *)
+               echo "*** ${KEY}:${SEL}"
+               read x
+               ;;
+       esac
+    done
+}
+
+N=2
+while true ; do
+    SNAPS="$(snap2iselect)"
+    CNO="$(iselect -n "($DIR1/)" \
+                 -t "Snapshots for $NILFSDEV=$NILFSROOT" -p $N -P \
+                 "Select snapshot" "$SNAPS")"
+    [ -z "$CNO" ] && break
+    N=${CNO%%:*}
+    CNO=${CNO#*:}
+    if sudo mount -t nilfs2 -oro,cp=$CNO $NILFSDEV $MOUNT ; then
+       dirsdiff /
+       sudo umount $MOUNT
+    fi
+done