From ad5f03c11a6d52aba33b9787ed1dd23296b3c756 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Sat, 26 Oct 2019 16:45:27 +0200
Subject: forwarddown neu

---
 .gitignore     |   1 +
 Makefile       |   5 +--
 forwarddown.in | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 115 insertions(+), 2 deletions(-)
 create mode 100644 forwarddown.in

diff --git a/.gitignore b/.gitignore
index b917e42..6dae642 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@ backup@.timer
 backup-progress
 backup-statistics
 fast-repair
+forwarddown
 last-backups
 remove-old-backups
 man.commons
diff --git a/Makefile b/Makefile
index 4a7c599..761b72b 100644
--- a/Makefile
+++ b/Makefile
@@ -33,6 +33,7 @@ all: man.commons \
  backup@.service backup@.timer \
  backup-progress \
  backup-statistics backup-statistics.1 \
+ forwarddown forwarddown.1 \
  last-backups last-backups.1 \
  remove-old-backups remove-old-backups.1
 
@@ -53,9 +54,9 @@ all: man.commons \
 .PHONY:	install dist clean
 
 install: all
-	install -D -m0755 -t $(DESTDIR)$(BINDIR) backup backup-progress backup-statistics last-backups remove-old-backups
+	install -D -m0755 -t $(DESTDIR)$(BINDIR) backup backup-progress backup-statistics forwarddown last-backups remove-old-backups
 	install -D -m0644 -t $(DESTDIR)$(LIBDIR)/systemd/system backup@.service backup@.timer
-	install -D -m0644 -t $(DESTDIR)$(MANDIR)/man1 backup.1 backup-statistics.1 last-backups.1 remove-old-backups.1
+	install -D -m0644 -t $(DESTDIR)$(MANDIR)/man1 backup.1 backup-statistics.1 forwarddown.1 last-backups.1 remove-old-backups.1
 	install -D -m0644 -t $(DESTDIR)$(ETCDIR) backup.conf
 	install -D -m0755 -T sendmailadvanced.hook $(DESTDIR)$(ETCDIR)/sendmailadvanced.hooks/last-backups
 
diff --git a/forwarddown.in b/forwarddown.in
new file mode 100644
index 0000000..31b4487
--- /dev/null
+++ b/forwarddown.in
@@ -0,0 +1,111 @@
+#!/bin/bash
+
+[ -r "#ETCDIR#/backup.conf" ] && \
+  . "#ETCDIR#/backup.conf"
+
+usage()
+{
+  >&2 echo \
+'Usage:  forwarddown key-id date backup-id1 backup-id2 ...
+Write encrypted, compressed tar from backed up files not newer than date to stdout.
+
+Options:
+  key-id        key id of key to encrypt to
+  date          backup should not be newer than the given date
+  backup-id[n]  backups to restore
+#HELPTEXT#              #'
+  [ -z "$1" ] && exit 1
+  exit $1
+}
+
+if [ $# -eq 1 ]; then
+  if [ "$1" == "--help" ]; then
+    usage 0
+  elif [ "$1" == "--version" ]; then
+    echo '#VERSION#'
+    exit
+  fi
+fi
+
+if [ $# -lt 3 ]; then
+  usage
+fi
+
+key_id=$(
+  printf '%s\n' "$1" \
+  | tr '[:lower:]' '[:upper:]'
+)
+shift
+
+if ! gpg --list-keys --with-colon "${key_id}" \
+| grep -qxF 'fpr:::::::::'"${key_id}"':'; then
+  >&2 printf 'Cannot find gpg key with fingerprint "%s"\n' "${key_id}"
+  usage
+fi
+
+if ! date=$(date -u '+%Y_%m_%d' -d"${1}"); then
+  >&2 printf 'Cannot parse date "%s"\n' "${1}"
+  usage
+fi
+shift
+
+forwarddown_dirs=()
+
+for backup_id in "$@"; do
+  if [ -z "${backups[${backup_id}]}" ]; then
+    >&2 printf 'backup id "%s" is unknown\n' "${backup_id}"
+    usage
+  fi
+  forwarddown_dirs+=("${backups[${backup_id}]## *}")
+done
+
+date=$(
+  {
+    find "${forwarddown_dirs[@]%% *}" -mindepth 1 -maxdepth 1 -type d -printf '0 %f\n'
+    printf '1 %s\n' "${date}"
+  } \
+  | sort -k2,2 -k1,1 \
+  | sed '
+    s/^0 //
+    t
+    /^1 / q
+  ' \
+  | uniq -c \
+  | sed '
+    s/^\s*'"${#forwarddown_dirs[@]}"'\s\+//
+    t
+    d
+  ' \
+  | tail -n1
+)
+
+transforms=(
+  $(
+    for backup_id in "$@"; do
+      printf -- '--transform=s@^%s/%s/@%s/%s/@\n' \
+        "${backups[${backup_id}]%% *}" \
+        "${date}" \
+        "${date}" \
+        "${backup_id}"
+    done
+  )
+)
+
+directories=(
+  $(
+    for backup_id in "$@"; do
+      printf '%s/%s/\n' \
+        "${backups[${backup_id}]%% *}" \
+        "${date}"
+    done
+  )
+)
+
+tar \
+  -c \
+  -f - \
+  --absolute-names \
+  "${transforms[@]}" \
+  "${directories[@]}" \
+| pigz --best -c - \
+| gpg -e -r "${key_id}" -o - -
-- 
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