Implement blackbox in Golang (#250)

* Initial release

binv2/blackbox_addadmin

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+#!/usr/bin/env bash
+exec blackbox admin add "$@"

binv2/blackbox_cat

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+#!/usr/bin/env bash
+exec blackbox cat "$@"

binv2/blackbox_decrypt_all_files

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+#!/usr/bin/env bash
+exec blackbox decrypt --all --agentcheck=true --overwrite "@"

binv2/blackbox_decrypt_file

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+#!/usr/bin/env bash
+exec blackbox decrypt --overwrite "$@"

binv2/blackbox_deregister_file

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+#!/usr/bin/env bash
+exec blackbox file remove --safe "$@"

binv2/blackbox_diff

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+#!/usr/bin/env bash
+exec blackbox diff --diff "$@"

binv2/blackbox_edit

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+#!/usr/bin/env bash
+exec blackbox edit "$@"

binv2/blackbox_edit_end

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+#!/usr/bin/env bash
+exec blackbox encrypt --shred "$@"

binv2/blackbox_edit_start

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+#!/usr/bin/env bash
+exec blackbox decrypt "$@"

binv2/blackbox_initialize

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+#!/usr/bin/env bash
+exec blackbox init "$@"

binv2/blackbox_list_admins

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+#!/usr/bin/env bash
+exec blackbox admin list

binv2/blackbox_list_files

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+#!/usr/bin/env bash
+exec blackbox file list

binv2/blackbox_listadmins

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+#!/usr/bin/env bash
+exec blackbox admin list

binv2/blackbox_postdeploy

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+#!/usr/bin/env bash
+blackbox decrypt --all --overwrite --group "$1"

binv2/blackbox_register_new_file

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+#!/usr/bin/env bash
+exec blackbox file add --shred "$@"

binv2/blackbox_removeadmin

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+#!/usr/bin/env bash
+exec blackbox admin remove "$@"

binv2/blackbox_shred_all_files

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+#!/usr/bin/env bash
+exec blackbox shred --all

binv2/blackbox_update_all_files

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+#!/usr/bin/env bash
+exec blackbox reencrypt --all --agentcheck

binv2/blackbox_view

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+#!/usr/bin/env bash
+blackbox cat "$@" | ${PAGER:-less}

binv2/blackbox_whatsnew

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+#!/usr/bin/env bash
+
+#
+# blackbox_whatsnew - show what has changed in the last commit for a given file
+#
+exec blackbox whatsnew "$@"
+exit 0
+
+set -e
+source "${0%/*}/_blackbox_common.sh"
+
+if [[ $# -ne 1 ]]
+then
+  echo "Pass only 1 file at a time"
+  exit 1
+fi
+
+fail_if_not_in_repo
+gpg_agent_notice
+
+COLUMNS=`tput cols`
+FILE=$1
+GIT="git log --abbrev-commit --pretty=oneline"
+CURR_COMMIT=`$GIT                  $FILE | head -1 | awk '{print $1}'`
+PREV_COMMIT=`$GIT ${CURR_COMMIT}~1 $FILE | head -1 | awk '{print $1}'`
+# Use colordiff if available
+if which colordiff > /dev/null 2>&1
+  then DIFF="colordiff"
+  else DIFF="diff"
+fi
+
+cat_commit()
+{
+  COMMIT=$1
+  git checkout $COMMIT $FILE
+  echo "[$COMMIT] $FILE"
+  echo "---------------------"
+  "${BLACKBOX_HOME}/blackbox_cat" $FILE | sed '/========== PLAINFILE/,/========== EXTRACTING/d'
+}
+
+CURR_CONTENT=`cat_commit $CURR_COMMIT`
+PREV_CONTENT=`cat_commit $PREV_COMMIT`
+clear
+
+# For some unknown reason this command executes fine but return exit code 1
+$DIFF -y --width $COLUMNS \
+  <(echo "CURRENT"  "$CURR_CONTENT" | fold -w $(( $COLUMNS / 2 - 4 ))  ) \
+  <(echo "PREVIOUS" "$PREV_CONTENT" | fold -w $(( $COLUMNS / 2 - 4 ))  )
+
+git checkout $CURR_COMMIT $FILE
+echo