user/chmoddirbr

   1 #!/usr/bin/env bash
   2 # Desc: Applies chmod to a segment of a directory branch of the
   3 # filesystem tree. Changes applied to all directories starting with
   4 # TIP and ending with (but not including) TRUNK.
   5
   6 # Usage: chmoddirbr [path TRUNK] [path TIP]
   7 # Input: arg1: TRUNK path
   8 #        arg2: TIP path
   9 #        arg3+ arguments to be passed on to chmod
  10 # Output: None.
  11 # Depends: GNU Coreutils 8.30 (chmod), Bash 5.0.3
  12
  13 # Example: chmoddirbr /tmp /tmp/1/2/3/4/5/6 o+rx
  14 #   This runs `chmod o+rx /tmp/1/2/3/4/5/6`
  15 #             `chmod o+rx /tmp/1/2/3/4/5`
  16 #             `chmod o+rx /tmp/1/2/3/4`
  17 #             ...
  18 #             `chmod o+rx /tmp/1`
  19
  20 yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
  21 die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
  22 try() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
  23 main() {
  24     declare -a chmod_args
  25     declare -a dirs_branch
  26
  27     arg1="$1"; shift;
  28     arg2="$1"; shift;
  29     chmod_args=("$@");
  30
  31     #yell "DEBUG:arg1:$arg1";
  32     #yell "DEBUG:arg2:$arg2";
  33     #yell "DEBUG:chmod_args:${chmod_args[@]}";
  34
  35     # Check input dirs
  36     if [[ -d $arg1 ]]; then
  37         dir_trunk="$(readlink -f "$arg1")"; # use full path
  38         #yell "DEBUG:dir_trunk:$dir_trunk";
  39     else
  40         die "ERROR:TRUNK is not a dir:$arg1";
  41     fi;
  42     if [[ -d $arg2 ]]; then
  43         dir_tip="$(readlink -f "$arg2")"; # use full path
  44         #yell "DEBUG:dir_tip  :$dir_tip";
  45     else
  46         die "ERROR:TIP is not a dir:$arg2";
  47     fi;
  48
  49     # Check if $dir_trunk points to $dir_tip
  50     if [[ $dir_tip =~ ^"$dir_trunk" ]]; then
  51         :
  52         #yell "DEBUG:Tip is within trunk.";
  53     else
  54         yell "NOTE:dir_trunk:$dir_trunk";
  55         yell "NOTE:dir_tip  :$dir_tip";
  56         die "ERROR:Tip is not within trunk.";
  57     fi;
  58
  59     # Assemble dirs_branch array
  60     ## Note: dirs_branch will not include $dir_trunk
  61     point="$dir_tip";
  62     while [[ $point != $dir_trunk ]]; do
  63         #yell "DEBUG:start point    :$point";
  64         #yell "DEBUG:start dir_trunk:$dir_trunk";
  65         dirs_branch+=("$point");
  66
  67         # Walk up branch
  68         point="$(dirname "$point")";
  69         #yell "DEBUG:end   point    :$point";
  70         #yell "DEBUG:end   dir_trunk:$dir_trunk";
  71         #yell ""; # debug
  72     done;
  73     unset point;
  74     #yell "DEBUG:${dirs_branch[@]}";
  75
  76     # Perform action
  77     n=0;
  78     for dir in "${dirs_branch[@]}"; do
  79         yell "STATUS:$((n+1)):Running: chmod $chmod_args $dir";
  80         try chmod "$chmod_args" "$dir" && ((n++));
  81     done;
  82     yell "STATUS:Finished. Ran chmod $((n)) times.";
  83 } # main program
  84
  85 main "$@";
  86
  87 # Author: Steven Baltakatei Sandoval
  88 # License: GPLv3+