1 files changed, 69 insertions, 0 deletions
diff --git a/lib/backup/s3.sh b/lib/backup/s3.sh
new file mode 100644
index 0000000..e463e76
--- /dev/null
+++ b/lib/backup/s3.sh
@@ -0,0 +1,69 @@
+# The configuration variable "backup_bucket_name" must contain the name
+# of the s3 bucket to use.
+
+# Raw bucket is mounted to /mnt/s3backer
+test -z "$backup_mp_s3backer" && backup_mp_s3backer=/mnt/s3backer
+# The actual file system is mounted to /mnt/s3
+test -z "$backup_mp" && backup_mp_s3=/mnt/s3
+
+# This variable is populated by s3_mount and is used by s3_unmount to unmount
+# s3-backed file system.
+umount_list=""
+
+s3_mount() {	
+  # Make sure both mountpoints exist
+  test -d $backup_mp_s3backer || mkdir $backup_mp_s3backer
+  test -d $backup_mp_s3 || mkdir $backup_mp_s3backer
+
+# Sample mount output, split into several lines:
+# http://finox-backup-fs.s3.amazonaws.com/ on /mnt/s3backer type fuse.s3backer
+#  (rw,nosuid,nodev,allow_other,default_permissions)
+  set -- $(mount -tfuse.s3backer | 
+           awk '/https?:\/\/'$backup_bucket_name'/ { print $3 }')
+  if test -z "$1"; then
+    $dry_run s3backer --accessFile=/root/.s3backer_passwd --vhost \
+                      $backup_bucket_name $backup_mp_s3backer ||
+	     abend 1 "unable to mount $backup_bucket_name"
+    umount_list="$backup_mp_s3backer"
+  else
+    backup_mp_s3backer=$1
+  fi
+  set -- $(mount | grep "^${backup_mp_s3backer}/file" | awk '{ print $3 }')
+  if test -z "$1"; then
+    case $(basename $0) in
+    restore) mountopt=",ro";;
+    backup)  mountopt=",rw,data=writeback";;
+    s3mount) ;;
+    *)       error "called as $0: assuming default mount options"
+    esac
+    # NOTE: For ext4 add the journal_async_commit option.
+    $dry_run mount -oloop$mountopt $backup_mp_s3backer/file $backup_mp_s3 || 
+             abend 1 "unable to mount $backup_mp_s3backer/file"
+    umount_list="$backup_mp_s3 $umount_list"
+  else
+    backup_mp_s3=$1
+  fi
+  epilogue_hook="s3_unmount $epilogue_hook"
+}
+
+s3_getmpoint()
+{
+  case $1 in
+  backer)
+    mount -tfuse.s3backer | 
+           awk '/https?:\/\/'$backup_bucket_name'/ { print $3 }';;
+  s3)
+    mount | grep "^${backup_mp_s3backer}/file" | awk '{ print $3 }';;
+  *)
+    abent 1 "invalid usage of getmpoint"
+  esac
+}
+
+s3_unmount()
+{
+  for id in s3 backer
+  do
+    mpoint=$(s3_getmpoint $id)
+    test -n "$mpoint" && umount $mpoint
+  done
+}