rbm.conf: Handle SIGINT case

rbm.conf

@@ -504,6 +504,18 @@ runc:
   remote_start: |
     #!/bin/sh
     set -e
+
+    # Handle SIGINT case
+    if [ -d '[% c("rbm_tmp_dir") %]'/../interrupted_dirs/'[% c("var/build_id") %]' ]
+    then
+        # We previously did this build but it was manually interrupted.
+        # Restore the container's saved state instead of making a new container.
+        mkdir -p '[% c("var/container/dir") %]'
+        rmdir '[% c("var/container/dir") %]'
+        mv '[% c("rbm_tmp_dir") %]'/../interrupted_dirs/'[% c("var/build_id") %]' '[% c("var/container/dir") %]'
+        exit
+    fi
+
     if [ $(ls -1 '[% c("remote_srcdir", { error_if_undef => 1 }) %]/container-image_'* | wc -l) -ne 1 ]
     then
       echo "Can't find container image in input files" >&2
@@ -580,6 +592,19 @@ runc:
   remote_finish: |
     #!/bin/sh
     set -e
+
+    # Handle SIGINT case
+    if [ -e '[% c("rbm_tmp_dir") %]'/../interrupted ]
+    then
+        # This build was manually interrupted via tools/container-interrupt.sh.
+        # Save the container's state instead of deleting, so we can resume 
+        # the build later.
+        mkdir -p '[% c("rbm_tmp_dir") %]'/../interrupted_dirs
+        mv '[% c("var/container/dir") %]' '[% c("rbm_tmp_dir") %]'/../interrupted_dirs/'[% c("var/build_id") %]'
+        rm '[% c("rbm_tmp_dir") %]'/../interrupted
+        exit
+    fi
+
     sudo rm -Rf '[% c("var/container/dir", { error_if_undef => 1 }) %]'/rootfs '[% c("var/container/dir", { error_if_undef => 1 }) %]'/config.json
     rmdir '[% c("var/container/dir") %]'