From 2c37f041937f468596158d76bb8ecb3442b0e4b4 Mon Sep 17 00:00:00 2001
From: CyberLeo <cyberleo@cyberleo.net>
Date: Mon, 3 Jan 2011 07:23:03 -0600
Subject: [PATCH] Add fixusers script to handle bash-config symlinks in user
 directories

---
 share/fixuser | 197 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 197 insertions(+)
 create mode 100755 share/fixuser

diff --git a/share/fixuser b/share/fixuser
new file mode 100755
index 0000000..d26d014
--- /dev/null
+++ b/share/fixuser
@@ -0,0 +1,197 @@
+#!/bin/sh
+
+pebkac() {
+  [ "${*}" ] && printf "%s\n\n" "${*}"
+  cat <<EOF
+Usage: fixuser [-c|-i|-r] <user> [user ...]
+
+ -c    Check symlinks for sanity
+ -i    Install symlinks
+ -r    Remove symlinks
+
+This script will adjust the bash-config symlinks in the homedir of
+the supplied user, or all users if unspecified.
+
+This script will avoid tampering with files that it thinks are
+manually added. Use -c to check, and verify the files manually
+afterwards.
+
+EOF
+  exit "${#}"
+}
+
+files="bash_profile bashrc"
+
+userlist() {
+  # Ignore users with shell not in /etc/shells
+  # Ignore users with invalid homedir
+  # Ignore subsequent users with the same homedir (root, toor, daemon, etc)
+  # List all remaining usernames
+  local _home_cache
+  getent passwd | while IFS=: read user pass uid gid gecos home shell extra
+  do
+    getent shells "${shell}" >&- || continue
+    [ -d "${home}" ] || continue
+    echo "${_home_cache}" | grep -q " ${home} " && continue
+    _home_cache="${_home_cache} ${home} "
+    echo "${user}"
+  done
+}
+
+userdir() {
+  [ "${1}" ] || return 1
+  # This is a loop because read will not work after pipe due to subshell isolation
+  getent passwd "${1}" | while IFS=: read user pass uid gid gecos home shell extra
+  do
+    echo "${home}"
+    break
+  done
+}
+
+mine() {
+  [ "${1}" ] || return 1
+  user="${1}"; shift
+  [ "${#}" -eq 0 ] && set - ${files}
+  while [ "${1}" ]
+  do
+    file="${1}"
+    link="$(userdir "${user}")/.${file}"
+    real="/usr/local/etc/bash-config/${file}"
+    if [ ! -L "${link}" ] || [ "$(realpath "$(readlink "${link}")")" != "${real}" ]
+    then
+      return 1
+    fi
+    shift
+  done
+  return 0
+}
+
+gone() {
+  [ "${1}" ] || return 1
+  user="${1}"; shift
+  [ "${#}" -eq 0 ] && set - ${files}
+  while [ "${1}" ]
+  do
+    file="${1}"
+    link="$(userdir "${user}")/.${file}"
+    [ -f "${link}" ] && return 1
+    shift
+  done
+  return 0
+}
+
+check() {
+  [ "${1}" ] || return 1
+  user="${1}"; shift
+  [ "${#}" -eq 0 ] && set - ${files}
+  echo "Checking user ${user}..."
+  while [ "${1}" ]
+  do
+    file="${1}"
+    if gone "${user}" "${file}"
+    then
+      echo " File ${file} does not exist."
+    else
+      if mine "${user}" "${file}"
+      then
+        echo " File ${file} is mine."
+      else
+        echo " File ${file} exists, but is not mine."
+      fi
+    fi
+    shift
+  done
+}
+
+install() {
+  [ "${1}" ] || return 1
+  user="${1}"
+  if mine "${user}"
+  then
+    echo "User symlinks appear to be correct"
+    return 0
+  fi
+  
+  if ! gone "${user}"
+  then
+    echo "User files (${files}) appear to exist, and are not mine"
+    echo "Refusing to molest them"
+    return 1
+  fi
+  
+  for file in ${files}
+  do
+    link="$(userdir "${user}")/.${file}"
+    real="/usr/local/etc/bash-config/${file}"
+    [ "${link%%.${file}}" = "/" ] && return 1
+    su "${user}" -c "ln -s '${real}' '${link}'" || return $?
+  done
+  return 0
+}
+
+remove() {
+  [ "${1}" ] || return 1
+  user="${1}"
+  if gone "${user}"
+  then
+    echo "User symlinks already removed"
+    return 0
+  fi
+  
+  if ! mine "${user}"
+  then
+    echo "User files (${files}) appear to exist, and are not mine"
+    echo "Refusing to molest them"
+    return 1
+  fi
+  
+  for file in ${files}
+  do
+    link="$(userdir "${user}")/.${file}"
+    [ "${link%%.${file}}" = "/" ] && return 1
+    rm -f "${link}" || return $?
+  done
+  return 0
+}
+
+state() {
+  [ -z "${cmd}" ] || pebkac "Only specify one of -c -i -r"
+  cmd="${1}"
+}
+
+cmd=""
+
+while getopts "cir" opt
+do
+  case "${opt}" in
+  c)  state check ;;
+  i)  state install ;;
+  r)  state remove ;;
+  [?]) pebkac "Unrecognized option ${OPTARG}" ;;
+  esac
+done
+shift $(( $OPTIND - 1 ))
+
+[ "${cmd}" ] || pebkac
+
+# Default to current user if not root
+if [ "$(id -u)" -gt 0 ]
+then
+  if [ "${*}" -a "${*}" != "${USER}" ]
+  then
+    echo "Mortal users can only modify themselves" >&2
+    exit 1
+  fi
+  [ "${#}" -eq 0 ] && set - ${USER}
+else
+  [ "${#}" -eq 0 ] && set - $(userlist)
+fi
+
+printf "Working on user(s) "
+echo "${@}"
+
+while [ "${1}" ]
+do
+  "${cmd}" "${1}"
+  shift
+done
-- 
2.42.0