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#!/usr/bin/env bash
set -Eeuo pipefail
possibles=( nobody daemon irc www-data )
if [ -n "${AUTOPKGTEST_NORMAL_USER:-}" ]; then
possibles=( "$AUTOPKGTEST_NORMAL_USER" "${possibles[@]}" )
fi
if self="$(id -un 2>/dev/null)"; then
# try "self" last because that's the least interesting test (root becoming root)
possibles+=( "$self" )
fi
gosuAs=
expect=
for user in "${possibles[@]}"; do
if grep -qP "^\Q${user}\E:" /etc/passwd && expect="$(id "$user" 2> /dev/null)"; then
gosuAs="$user"
break
fi
done
if [ -z "$gosuAs" ]; then
cat >&2 <<-EOF
error: AUTOPKGTEST_NORMAL_USER not set (or not usable) and could not find a suitable alternative user
tried: ${possibles[*]}
EOF
id "${possibles[@]}" >&2 || :
exit 1
fi
actual="$(gosu "$gosuAs" id)"
if [ "$actual" != "$expect" ]; then
cat >&2 <<-EOF
error: unexpected output ("gosu $gosuAs id"):
actual: $actual
expect: $expect
EOF
exit 1
fi
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