Reusable bash functions for creating a local temporary directory with rm exit trap.

local_temp_dir_rm_exit_trap.sh

#!/usr/bin/env bash

set -euo pipefail

####################################################################

#
# Reusable functions for creating a local temporary directory:
#   - [mk_tmp_dir] create local directory with unique name
#   - [cleanup] add exit trap to rm this directory
#
# Use is always in the 2-call pattern:
#     D=$(mk_tmp_dir)
#     trap "cleanup $D" EXIT
#

cleanup() {
    rm -rf "${1}"
}

mk_tmp_dir() {
    # https://stackoverflow.com/a/10823731/362021
    local UUID=$(hexdump -n 16 -v -e '/1 "%02X"' /dev/urandom)
    local TEMP_INSTALL="$(pwd)/temp_install_space-${UUID}"
    mkdir "${TEMP_INSTALL}"
    echo "${TEMP_INSTALL}"
}

####################################################################

# Example use

name=$(mk_tmp_dir)
trap "cleanup $name" EXIT

echo "Local temporary directory: $name"

echo "writing!"
echo "hello world!" > "${name}/hi"

tree "${name}"

s=10
printf "sleep %ds\n" $s
sleep $s

Example run with triggered signal causing exit during sleep --

Run until sleep:

$ ./x.sh
Local temporary directory: /Users/mgreaves/temp_install_space-82BC463E19766E59D88EEDEC25026BFE
writing!
/Users/mgreaves/temp_install_space-82BC463E19766E59D88EEDEC25026BFE
└── hi

1 directory, 1 file
sleep 10s
^Z
[1]  + 28879 suspended  ./x.sh

Inspecting while suspended:

$ ls /Users/mgreaves/temp_install_space-82BC463E19766E59D88EEDEC25026BFE
hi

Resuming and interrupting with SIGINT:

$ fg
[1]  - 28879 continued  ./x.sh
^C

Observe directory is gone:

$ ls /Users/mgreaves/temp_install_space-82BC463E19766E59D88EEDEC25026BFE
ls: /Users/mgreaves/temp_install_space-82BC463E19766E59D88EEDEC25026BFE: No such file or directory

Example run with normal exit --

Run and let program exit normally after sleep:

$ time ./x.sh
Local temporary directory: /Users/mgreaves/temp_install_space-7D2747042EC24D15DD66DD5D8C56C758
writing!
/Users/mgreaves/temp_install_space-7D2747042EC24D15DD66DD5D8C56C758
└── hi

1 directory, 1 file
sleep 10s
./x.sh  0.01s user 0.03s system 0% cpu 10.085 total

Directory is gone after program exits normally:

$ ls /Users/mgreaves/temp_install_space-7D2747042EC24D15DD66DD5D8C56C758
ls: /Users/mgreaves/temp_install_space-7D2747042EC24D15DD66DD5D8C56C758: No such file or directory