initial commit

update.sh

@@ -0,0 +1,87 @@
+#!/bin/bash
+
+# Download latest howto database to destination directory
+# Features:
+# - check for valid SHA-256
+# - skip download on remote data match local version (up to date)
+
+# =========================================================================
+# Configuration
+# =========================================================================
+
+ThisDir="/home/bdoku/howtools"
+DataDir="/home/bdoku/howto-db"
+
+RemoteHost="http://[222:a8e4:50cd:55c:788e:b0a5:4e2f:a92c]"
+RemoteVersion=$(date -d "$date -1 days" +"%F")-23-30
+
+RemoteDataURL="${RemoteHost}/howto-wiki_${RemoteVersion}.tar.gz"
+RemoteSHA256URL="${RemoteHost}/howto-wiki_${RemoteVersion}.tar.gz.sha-256"
+
+RemoteSHA256TMP="${ThisDir}/tmp/remote.sha-256"
+LocalSHA256TMP="${ThisDir}/tmp/local.sha-256"
+LocalDataTMP="${ThisDir}/tmp/data.tar.gz"
+
+# =========================================================================
+# Compare versions
+# =========================================================================
+
+# Get remote SHA-256
+wget $RemoteSHA256URL -O $RemoteSHA256TMP
+
+# Remote SHA-256 valid
+RemoteSHA256=$(<$RemoteSHA256TMP)
+
+if ! [[ ${RemoteSHA256:0:64} =~ ^([0-9a-f]{64})$ ]]; then
+  echo Invalid remote SHA-256
+  exit
+fi
+
+# Get local SHA-256
+if [[ -f $LocalSHA256TMP ]]; then
+  LocalSHA256=$(<$LocalSHA256TMP)
+else
+  LocalSHA256=""
+fi
+
+# Compare versions
+if [[ ${LocalSHA256:0:64} == ${RemoteSHA256:0:64} ]]; then
+  echo "DB up to date!"
+  exit
+fi
+
+# =========================================================================
+# SHA-256 versions mismatch, begin update
+# =========================================================================
+
+echo "Begin update..."
+
+wget $RemoteDataURL -O $LocalDataTMP
+
+# Generate SHA-256
+sha256sum $LocalDataTMP > $LocalSHA256TMP
+
+if [[ -f $LocalSHA256TMP ]]; then
+  LocalSHA256=$(<$LocalSHA256TMP)
+else
+  LocalSHA256=""
+fi
+
+# Check for download contain valid SHA-256
+if ! [[ ${LocalSHA256:0:64} =~ ^([0-9a-f]{64})$ ]]; then
+  echo Invalid local SHA-256
+  exit
+fi
+
+# Check for download match remote SHA-256
+if ! [[ ${LocalSHA256:0:64} == ${RemoteSHA256:0:64} ]]; then
+  echo "SHA-256 mismatch!"
+  exit
+fi
+
+# Begin update
+echo "Unpack downloaded data to destination..."
+
+tar -xvf $LocalDataTMP -C $DataDir
+
+echo "Update completed!"