Implement thread hiding

upgrade_sqlite.sh

@@ -0,0 +1,82 @@
+#!/usr/bin/env bash
+
+# Script to upgrade a database from one version to another by adding columns,
+# tables etc.
+
+LAST_VERSION=agreper-v0.1.1
+
+SQLITE=sqlite3
+
+export SQLITE
+
+set -e
+
+if [ $# -lt 1 ]
+then
+	echo "Usage: $0 <file.db> [--no-backup]" >&2
+	exit 1
+fi
+
+make_backup=0
+
+if [ $# -ge 2 ]
+then
+	case "$2" in
+		--no-backup)
+			make_backup=1
+			;;
+		*)
+			echo "Unknown option $2"
+			exit 1
+			;;
+	esac
+fi
+
+if ! [ -f "$1" ]
+then
+	echo "Database '$1' doesn't exist" >&2
+	exit 1
+fi
+
+version=$(sqlite3 "$1" 'select version from config')
+
+while true
+do
+	case "$version" in 
+		# Last version, do nothing
+		agreper-v0.1.1)
+			echo "$version is the latest version"
+			exit 0
+			;;
+		# Try to upgrade
+		agreper-*)
+			echo "Upgrading from $version"
+
+			if [ $make_backup ]
+			then
+				backup="$1.bak-$version"
+				if [ -f "$backup" ]
+				then
+					echo "Backup '$backup' already exists (did a previous upgrade fail?)" >&2
+					exit 1
+				fi
+				echo "Creating backup of $1 at $backup"
+				cp --reflink=auto "$1" "$backup"
+				make_backup=1
+			fi
+
+			script="./upgrade/sqlite/${version#agreper-}.sh"
+			if ! bash "$script" "$1"
+			then
+				echo "Error while executing $script"
+				exit 1
+			fi
+			;;
+		# Unrecognized version
+		*)
+			echo "Unknown version $version" >&2
+			exit 1
+			;;
+	esac
+	version=$(sqlite3 "$1" 'select version from config')
+done