From 7e776ad42c3b6f839739f3f87f319f6abfb20cfc Mon Sep 17 00:00:00 2001
From: Otho <otho@othoulrich.com>
Date: Sat, 19 Nov 2022 03:49:50 -0500
Subject: [PATCH] Updated to single data file.

---
 .gitignore |  5 ++---
 backup.sh  | 65 +++++++++++++++++++++++-------------------------------
 2 files changed, 30 insertions(+), 40 deletions(-)

diff --git a/.gitignore b/.gitignore
index 3958b7c..3c87c1f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
 datasets.txt
-rootzfs.txt
-hosts.txt
-user.txt
+nodes.txt
+old-snapshot.txt
diff --git a/backup.sh b/backup.sh
index 8072b4d..7deb499 100755
--- a/backup.sh
+++ b/backup.sh
@@ -1,18 +1,11 @@
 #!/usr/bin/env sh
 
-## Data Format
-
-### user.txt
-# <username>
-
-### hosts.txt
-# <host 1 address> <host 1 port> <host 1 root zfs>
-# <host 2 address> <host 2 port> <host 2 root zfs>
+### nodes.txt
+# localhost 22 <this host's root zfs> <this host's user>
+# <remote host 1 address> <host 1 port> <host 1 root zfs>
+# <remote host 2 address> <host 2 port> <host 2 root zfs>
 # ...
 
-### rootzfs.txt
-# <root zfs>
-
 ### datasets.txt (Only required for aggregator setup.)
 # <dataset 1>
 # <dataset 1>/<dataset 1a>
@@ -22,21 +15,19 @@
 # <dataset 3>
 # ...
 
-if [ ! -f user.txt ]; then echo "No user specified."; exit 2; fi
-if [ ! -f hosts.txt ]; then echo "No hosts specified."; exit 2; fi
-if [ ! -f rootzfs.txt ]; then echo "No rootzfs specified."; exit 2; fi
+if [ ! -f nodes.txt ]; then echo "No nodes specified."; exit 2; fi
 
-BAKRNG_ROOT=`cat rootzfs.txt`
+read BR_HOST BR_PORT BR_ROOT BR_USER < nodes.txt
 
 list_filesets()
 {
-    zfs list | tail -n +2 | cut -d' ' -f1|grep ${BAKRNG_ROOT}
+    zfs list | tail -n +2 | cut -d' ' -f1|grep ${BR_ROOT}
 }
 
 get_latest_snapshot()
 {
     zfs list -t snapshot |
-        grep ${BAKRNG_ROOT} |
+        grep ${BR_ROOT} |
         tail -n1 |
         cut -d'@' -f2 |
         cut -d' ' -f 1
@@ -44,7 +35,7 @@ get_latest_snapshot()
 
 setup_aggregator()
 {
-    zfs allow -u `cat user.txt` send,snapshot,hold ${BAKRNG_ROOT}
+    zfs allow -u ${BR_USER} send,snapshot,hold ${BR_ROOT}
     for dataset in `cat datasets.txt`; do
 	    zfs create $dataset
     done
@@ -52,43 +43,43 @@ setup_aggregator()
 
 setup_mirror()
 {
-    zfs allow -u `cat user.txt` send,snapshot,hold ${BAKRNG_ROOT}
-    zfs allow -du `cat user.txt` \
-        compression,mountpoint,receive,create,mount ${BAKRNG_ROOT}
+    zfs allow -u ${BR_USER} send,snapshot,hold ${BR_ROOT}
+    zfs allow -du ${BR_USER} \
+        compression,mountpoint,receive,create,mount ${BR_ROOT}
 }
 
 create_snapshot()
 {
     id="`date -I`-`date +%s`"
-    zfs snapshot -r ${BAKRNG_ROOT}@${id}
+    zfs snapshot -r ${BR_ROOT}@${id}
 }
 
 send_single_snapshot()
 {
-    BAKRNG_SEND_SNAPSHOT=`get_latest_snapshot`
-    while read BAKRNG_REMOTE_ADDR BAKRNG_REMOTE_PORT BAKRNG_REMOTE_ROOT; do
-        zfs send -R ${BAKRNG_ROOT}@${BAKRNG_SEND_SNAPSHOT} |
-            ssh -i ~/.ssh/id_rsa \
-            -o port=${BAKRNG_REMOTE_PORT} ${BAKRNG_REMOTE_ADDR} \
-            zfs receive -dvu ${BAKRNG_REMOTE_ROOT}@${BAKRNG_SEND_SNAPSHOT}
+    BR_NEW_SNAPSHOT=`get_latest_snapshot`
+    while read BR_REMOTE_ADDR BR_REMOTE_PORT BR_REMOTE_ROOT BR_REMOTE_USER; do
+        zfs send -R ${BR_ROOT}@${BR_NEW_SNAPSHOT} |
+            ssh -i ~/.ssh/id_rsa -o port=${BR_REMOTE_PORT} \
+            ${BR_REMOTE_USER}@${BR_REMOTE_ADDR} \
+            zfs receive -dvu ${BR_REMOTE_ROOT}@${BR_NEW_SNAPSHOT}
     done
-    echo $BAKRNG_SEND_SNAPSHOT > "last-snapshot.txt"
+    echo $BR_NEW_SNAPSHOT > "old-snapshot.txt"
 }
 
 send_incremental_snapshop()
 {
-    BAKRNG_SEND_SNAPSHOT=`get_latest_snapshot`
-    while read BAKRNG_REMOTE_ADDR BAKRNG_REMOTE_PORT BAKRNG_REMOTE_ROOT; do
-        zfs send -R -i `cat last-snapshot.txt` \
-            ${BAKRNG_ROOT}@${BAKRNG_SEND_SNAPSHOT} | ssh -i ~/.ssh/id_rsa \
-            -o port=${BAKRNG_REMOTE_PORT} ${BAKRNG_REMOTE_ADDR} \
-            zfs receive -dvu ${BAKRNG_REMOTE_ROOT}@${BAKRNG_SEND_SNAPSHOT}
+    BR_NEW_SNAPSHOT=`get_latest_snapshot`
+    while read BR_REMOTE_ADDR BR_REMOTE_PORT BR_REMOTE_ROOT BR_REMOTE_USER; do
+        zfs send -R -i `cat old-snapshot.txt` ${BR_ROOT}@${BR_NEW_SNAPSHOT} |
+            ssh -i ~/.ssh/id_rsa -o port=${BR_REMOTE_PORT} \
+            ${BR_REMOTE_USER}@${BR_REMOTE_ADDR} \
+            zfs receive -dvu ${BR_REMOTE_ROOT}@${BR_NEW_SNAPSHOT}
     done
-    echo $BAKRNG_SEND_SNAPSHOT > "last-snapshot.txt"
+    echo $BR_NEW_SNAPSHOT > "old-snapshot.txt"
 }
 
 
-if [ -f "last-snapshot.txt" ]; then
+if [ -f "old-snapshot.txt" ]; then
     send_incremental_snapshop
 else
     send_single_snapshot