From 6228dde234ae7d198071fc5e96f7c98af3044398 Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@kublai.com>
Date: Wed, 6 Jun 2018 12:57:34 -0400
Subject: More intelligent backup clone script.

---
 backup.conf    | 17 +++++++++++++++++
 send-backup    | 15 ---------------
 send-backup.pl | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 71 insertions(+), 15 deletions(-)
 create mode 100644 backup.conf
 delete mode 100755 send-backup
 create mode 100755 send-backup.pl

diff --git a/backup.conf b/backup.conf
new file mode 100644
index 0000000..3021ad9
--- /dev/null
+++ b/backup.conf
@@ -0,0 +1,17 @@
+# -*- mode: yaml -*-
+
+sources: 
+  - babar/bjc
+  - babar/ditto
+  - babar/shared
+  - babar/vms/arceus
+  - babar/vms/blacktop
+  - babar/vms/centos7
+  - babar/vms/freebsd10
+  - babar/vms/gandy
+  - babar/vms/macos10.6
+  - babar/vms/munchlax
+  - babar/vms/silver
+  - babar/vms/win10
+
+dest: backup
diff --git a/send-backup b/send-backup
deleted file mode 100755
index 520cf0b..0000000
--- a/send-backup
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/bin/sh
-
-src=babar
-dst=backup
-
-datasets=`zfs list -Ho name -r $src | tail -n +2 | cut -d/ -f2-`
-for fs in $datasets; do
-    from=`zfs list -Ht snap -d 1 -o name -s creation $dst/$fs | tail -1 | cut -d@ -f2`
-    to=`zfs list -Ht snap -d 1 -o name -s creation $src/$fs | tail -1 | cut -d@ -f2`
-
-    echo send $fs@$from to $fs@$to
-    if [ "x$from" != "x$to" ]; then
-       zfs send -RI babar/$fs@$from babar/$fs@$to | zfs recv backup/$fs
-    fi
-done
diff --git a/send-backup.pl b/send-backup.pl
new file mode 100755
index 0000000..ac12f32
--- /dev/null
+++ b/send-backup.pl
@@ -0,0 +1,54 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+
+use YAML::Tiny;
+use Data::Dumper;
+
+my $conffile = 'backup.conf';
+
+my $conf = YAML::Tiny->read($conffile);
+my $srcs = $conf->[0]->{sources};
+my $dest = $conf->[0]->{dest};
+
+system("zfs list $dest > /dev/null 2>&1") == 0 or
+  die "Error: pool '$dest' not found. Is it imported?\n";
+
+foreach my $src (@$srcs) {
+  my ($pool, $fs) = split(/\//, $src, 2);
+  my ($from, $to) = limits($pool, $dest, $fs);
+
+  unless (defined $from) {
+    print "Warning: $dest does not contain $fs. Initialize with:\n" .
+      "\tzfs send -R $pool/$to | zfs recv $dest/$fs\n";
+    next;
+  }
+
+  if ($from eq $to) {
+    print "No new snapshots for $pool/$fs.\n";
+    next;
+  }
+
+  print "Sending to $dest: $pool/$from -> $to\n";
+  my $cmd = "zfs send -RI $pool/$from $pool/$to | zfs recv $dest/$fs";
+  system($cmd) == 0 or die "Error: couldn't send snapshots with:\n\t$cmd\n."
+}
+
+sub limits {
+  my ($src, $dst, $fs) = @_;
+
+  my @dstsnaps = snaps("$dst/$fs");
+  my @srcsnaps = snaps("$src/$fs");
+
+  ($dstsnaps[$#dstsnaps], $srcsnaps[$#srcsnaps]);
+}
+
+sub snaps {
+  my $fs = shift;
+
+  map {
+    chomp;
+    (split /\//, $_, 2)[1];
+  } `zfs list -Ht snap -d 1 -o name -s creation $fs`;
+}
-- 
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