creation

diff --git a/scripts/crontabs.sh b/scripts/crontabs.sh
new file mode 100755 (executable)
index 0000000..585b7dd
--- /dev/null
+++ b/scripts/crontabs.sh
@@ -0,0 +1,213 @@
+#!/bin/bash
+
+# utility for gathering your crontab file on miscell hosts
+# 
+# relies on a config file named
+# ~/.crontabsrc
+# 
+# SYNTAX
+#
+# COMMENTS: line containing a sharp (#)
+# 
+# any other line should be a HOST declaration like this
+# [method:][username@]hostname
+#
+# defaults :
+# (*) method defaults to ssh:
+# (*) username defaults to $DEF_USER
+
+# examples
+#
+# foo
+#      =>      ssh:yourlogin@foo
+# rsh:bar
+#      =>      rsh:yourlogin@bar
+# joe@tutu
+#      =>      ssh:joe@tutu
+# localhost
+#      =>      local:nologin@$(hostname)
+
+# the config file can optionnally get passed as an argument
+
+COMMAND=$(basename $0)
+REV=$(echo '$Revision: 437 $' | sed -e 's,\$,,g')
+
+DEF_CONFIG="$HOME/.$(basename ${COMMAND} .sh)rc"
+
+OPT_VERBOSE="true" 
+OPT_VERSION="" 
+
+### try different ways to get username
+# linux
+DEF_USER="$(id --user --name 2>/dev/null)"
+# macintosh : id does not accept this syntax
+[[ -z "$DEF_USER" ]] && DEF_USER="$LOGNAME"
+# some other systems I met 
+[[ -z "$DEF_USER" ]] && DEF_USER="$USER"
+# still not found ? let's bail out
+if [[ -z "$DEF_USER" ]] ; then
+  echo "$COMMAND : could not get DEF_USER - emergency exit"
+  exit 1
+fi
+
+usage () {
+
+  echo "Usage: $0 [config-file]"
+  echo "  default config file is $DEF_CONFIG"
+  echo "Config file syntax :"
+  echo "  line containing a # is taken as a comment"
+  echo "  other lines should match the following syntax"
+  echo "  [method:][username@]hostname"
+  echo "Defaults:"
+  echo "  method defaults to ssh (as opposed to rsh or local)"
+  echo "  username defaults to $DEF_USER"
+}
+
+####################
+info () {
+  if [ -n "$OPT_VERBOSE" ] ; then
+    echo "INFO : $@"
+  fi
+}
+
+error () {
+  echo "ERROR : $@"
+}
+
+####################
+parse_config () {
+  config=$1; shift
+
+  if [ ! -f $config ] ; then
+    error "$config not found"
+    exit 1
+  fi
+
+  descriptions=$(grep -v '#' $config)
+
+  for desc in $descriptions ; do
+
+    ###defaults
+    method=ssh
+    user="$DEF_USER"
+    case $desc in
+      *:*@*)
+       method=$(echo $desc | sed -e 's,:.*$,,')
+       user=$(echo $desc | sed -e 's,^.*:,,' -e 's,@.*$,,')
+       host=$(echo $desc | sed -e 's,^.*@,,')
+       ;;
+      *:*)
+       method=$(echo $desc | sed -e 's,:.*$,,')
+       host=$(echo $desc | sed -e 's,^.*:,,')
+       ;;
+      *@*)
+       user=$(echo $desc | sed -e 's,@.*$,,')
+       host=$(echo $desc | sed -e 's,^.*@,,')
+       ;;
+      *)
+       host=$desc
+       ;;
+    esac
+
+    if [ "$host" == localhost ] ; then
+      host="$(hostname)"
+      method="local"
+    fi
+
+    case $method in
+      rsh|ssh|local)
+       get_crontab $method "$user" $host
+       ;;
+      *)
+       error "ERROR: $desc - method must be rsh, ssh or local"
+       break
+       ;;
+    esac
+
+  done
+}
+
+####################
+get_crontab () {
+  method=$1; shift
+  user=$1; shift
+  host=$1; shift
+
+  ## where to backup
+  if [ "$user" = "$DEF_USER" ] ; then
+    backup=~/.crontab-$host
+  else
+    backup=~/.crontab-$host-"$user"
+  fi
+
+  info "getting crontab for $user on $host with method $method into $backup"
+
+  ## temporary - overwites backup only if needed
+  tmp=/tmp/$COMMAND-$$.txt
+
+  case $method in
+    local)
+      crontab -l
+      ;;
+    ssh)
+      ssh "$user"@$host crontab -l
+      ;;
+    rsh)
+      rsh -l "$user" $host crontab -l
+      ;;
+  esac > $tmp 2> /dev/null
+
+  if [ "$?" != 0 ] ; then
+    ### info and not error : allow for too extensive crontabsrc
+    info " could not get crontab on $host"
+    rm -f $tmp
+    return 1
+  fi
+
+  diff $tmp $backup > /dev/null 2>&1
+
+  if [ "$?" != 0 ] ; then
+    ## files differ
+    cp $tmp $backup
+    if [ "$?" = 0 ] ; then
+      info "crontab on host $host saved in $backup"
+    else
+      error "could not overwrite $backup"
+    fi
+  else
+    info "no changes in crontab on $host - kept $backup"
+    rm -f $tmp
+  fi
+}
+####################
+main () {
+
+  while [[ -n "$@" ]] ; do
+    case "$1" in
+      -s*|--silent*)
+       OPT_VERBOSE="" ; shift ;;
+      -v*|--version*)
+       OPT_VERSION="true" ; shift ;;
+      -*)
+       usage ; exit 1 ;;
+      *)
+       break ;;
+    esac
+  done
+
+  if [ -n "$OPT_VERSION" ] ; then
+    echo "This is $COMMAND, $REV"
+    exit 0
+  fi
+
+  if [[ -n "$@" ]] ; then
+    CONFIG=$1; shift
+  else
+    CONFIG=$DEF_CONFIG
+  fi
+
+  parse_config $CONFIG
+}
+
+####################
+main "$@"