autoretry.sh

#!/bin/sh

set -e

script_name="$(basename "${0}")"
usage="${script_name}: force retries executing a custom command until it exits successfully.
Usage:
    ${script_name} COMMAND ARG1 ARG2 ...
Example:
    ${script_name} curl -C - --retry 5 -L -O {URL}"

if [ "$#" -lt 1 ]; then
    echo "${usage}" 1>&2
    exit 1
fi

count=1

execute() {
    local ret
    echo "Executing command: " "$@" 1>&2
    if "$@"; ret="$?"; [ "$ret" -ne 0 ]; then
        echo "Command failed with exit code $ret"
        return "$ret"
    fi
    return 0
}

#while echo "Executing command:" "$@" 1>&2 && ! "$@"
while ! execute "$@"
do
    sleep 1
    echo "------------------------\n"
    echo "Retrying... (attempt: ${count})"
    count=$((count + 1))
done

Example:

$ retry.sh brew install adobe-acrobat-reader
Executing command:  brew install adobe-acrobat-reader
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
==> Updated Formulae
Updated 1 formula.

==> Downloading https://ardownload2.adobe.com/pub/adobe/reader/mac/AcrobatDC/2100720099/AcroRdrDC_2100720099_MUI.dmg
###############################################################           88.6%
curl: (18) transfer closed with 34607262 bytes remaining to read
Error: Download failed on Cask 'adobe-acrobat-reader' with message: Download failed: https://ardownload2.adobe.com/pub/adobe/reader/mac/AcrobatDC/2100720099/AcroRdrDC_2100720099_MUI.dmg
Command failed with exit code 1
------------------------

Retrying... (attempt: 1)
Executing command:  brew install adobe-acrobat-reader
==> Downloading https://ardownload2.adobe.com/pub/adobe/reader/mac/AcrobatDC/2100720099/AcroRdrDC_2100720099_MUI.dmg
################################################################          89.1%