Add a script to save the contents of the students home directories (i…

…novex#8)

* Add a script to save the contents of the students home directories

* Add docs

* scp in parallel for better network utilization

Add output to gitignore

.gitignore

@@ -6,5 +6,6 @@ terraform.tfstate.backup
 .terraform
 ips
 packages
+homes
 account.json
 .DS_STORE

Readme.md

@@ -39,3 +39,7 @@ Now we can verify everything with the `plan` step: `terraform plan` if everythin
 ## Clean up
 
 In order to clean up everything just run: `terraform destroy`
+
+### Save Homes
+
+If you want to save the homes for your students, run the script `save_homes.sh`. This will copy all the contents of `/home/student` from the machines onto your machine. Then zip the files up and place them in `$(pwd)/homes`.

save_homes.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+set -eu
+
+# Find the script location. Inspired by: https://stackoverflow.com/questions/59895/get-the-source-directory-of-a-bash-script-from-within-the-script-itself
+scriptLocation="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+dest=${scriptLocation}/homes
+mkdir -p ${dest}
+
+function ipOf() {
+ local student=${1}
+ local node=${2}
+ cat ${scriptLocation}/ips/${student} | grep ${node} | awk '{ print $2 }'
+}
+
+function download() {
+ local student=${1}
+ tmpDir=$(mktemp -d)
+ mkdir ${tmpDir}/master
+ scp -q -o StrictHostKeyChecking=no -r -i ${scriptLocation}/keys/${student} student@$(ipOf ${student} master):/home/student ${tmpDir}/master || echo "some files might be missing for ${student} master"
+ mkdir ${tmpDir}/node
+ scp -q -o StrictHostKeyChecking=no -r -i ${scriptLocation}/keys/${student} student@$(ipOf ${student} node):/home/student ${tmpDir}/node || echo "some files might be missing for ${student} node"
+ zip -q -r ${dest}/${student}_home.zip ${tmpDir}
+ rm -rf ${tmpDir}
+}
+
+for student in $(find ips -type f -exec basename {} \;) ; 
+do 
+ download ${student} &
+done
+
+wait