add unpublished backup script

diff --git a/small-backup b/small-backup
new file mode 100755 (executable)
index 0000000..cba5b83
--- /dev/null
+++ b/small-backup
@@ -0,0 +1,128 @@
+#!/bin/bash
+
+# for duplicity source build
+PATH="$PATH:/usr/local/bin"
+
+# [--retry] interval_name [max_age]
+# takes 2 arguments specifying the name of the subfolder,
+# and optionally, the max age of the backup
+
+# this script setup by adding a user crontab. see t.org for the script
+# it's also setup to email me only when it fails, and only for daily or weekly runs
+
+# uncomment for debugging, prints all commands to stdout
+#set -x
+
+set -E
+#trap 'echo trapped error from \"$BASH_COMMAND\" returned $? line $LINENO; accumulated_errors=true' ERR
+trap 'echo trapped err: $?; accumulated_errors=true' ERR
+
+exec 3>&1 4>&2
+exec &>> /tmp/small-backup.log
+
+echo "BEGIN: $(date): args $*"
+
+
+# only works with a single letter, ie 2D, not 2D12h
+half-time() {
+    local time_word
+    local letter=${1##*[0-9]}
+    case $letter in
+        s) time_wrod=second ;;
+        m) time_word=minute ;;
+        h) time_word=hour ;;
+        D) time_word=day ;;
+        W) time_word=week ;;
+        M) time_word=month ;;
+        Y) time_word=year ;;
+    esac
+    echo "${1%%$letter} $time_word"
+    local x=$(date +%s -d "${1%%$letter} $time_word")
+    local y=$(date +%s)
+}
+
+
+if [[ $1 == --retry ]]; then
+    shift
+    x=0
+    while pid=( $(pidof -o %PPID -x ${0##*/}) ) && (( ${#pid[@]} > 1 )) && (( x < 20 )); do
+        x=$(( x + 1 ))
+        sleep 30
+    done
+    if [[ $x == 20 ]]; then
+        ps -F ${pid[@]}
+        echo timeout error: existing ${0##*/} running for over 5 minutes >&2
+        exit 1
+    fi
+else
+    if pid=( $(pidof -o %PPID -x ${0##*/}) ) && (( ${#pid[@]} > 1 )); then
+        echo ps -F ${pid[@]}
+        ps -F ${pid[@]}
+        echo error: existing ${0##*/} running >&2
+        exit 1
+    fi
+fi
+
+interval=$1
+max_age=$2
+full_backup_arg=""
+if [[ $max_age ]]; then
+    full_backup_arg="--full-if-older-than $(half-time $max_age)"
+fi
+
+rbackup () {
+
+    local d=$1
+    shift
+    local dest=root@li::/root/rdiff-backups/${d##*/}/${interval}
+
+    c="rdiff-backup $* --create-full-path $d $dest"
+    echo "$c"; $c
+
+    if [[ $max_age ]]; then
+        c="rdiff-backup --force --remove-older-than $max_age $dest"
+        echo "$c"; $c
+
+    fi
+}
+
+
+rbackup /a/bin --exclude /a/bin/fai-basefiles
+rbackup /a/c
+
+# this is populated after input_setup.sh is run on login
+
+ssh root@li mkdir -p /root/duplicity-backups/p/$interval
+source /p/duplicity/gpg_agent_env
+duplicity_dest=rsync://root@li//root/duplicity-backups/p/$interval
+
+x=(/p/*)
+if ((${#x[@]} > 1)); then
+    set -x
+    # archive-dir is sort of a persistent cache
+    duplicity --use-agent \
+              --encrypt-sign-key E969C67B \
+              --include-globbing-filelist /p/duplicity/filelist \
+              --archive-dir /p/duplicity/archive \
+              --tempdir /p/tmp \
+              $full_backup_arg /p $duplicity_dest
+    if [[ $max_age ]]; then
+        duplicity --use-agent \
+                  remove-all-but-n-full 2 --force $duplicity_dest
+    fi
+    set +x
+fi
+# example restore command. We only need to make the first argument be a url for it to know it to do restore
+# the archive-dir and tempdir args are not needed
+# duplicity --use-agent --encrypt-sign-key E969C67B --archive-dir /p/duplicity/archive --tempdir /p/tmp ssh://root@li//root/duplicity-backups/p/weekly /p/duptest
+
+
+echo END
+
+# to restore duplicity. see man for additional options
+# duplicity --use-agent restore ...
+if [[ $accumulated_error ]]; then
+    eccho "tail -n 50 of /tmp/small-backup.log:"
+    tail -n 50 /tmp/small-backup.log
+    exit 1
+fi