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015-help.bats
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015-help.bats
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#!/usr/bin/env bats
#
# Tests based on 'podman help'
#
# Find all commands listed by 'podman --help'. Run each one, make sure it
# provides its own --help output. If the usage message ends in '[command]',
# treat it as a subcommand, and recurse into its own list of sub-subcommands.
#
# Any usage message that ends in '[flags]' is interpreted as a command
# that takes no further arguments; we confirm by running with 'invalid-arg'
# and confirming that it exits with error status and message.
#
load helpers
# run 'podman help', parse the output looking for 'Available Commands';
# return that list.
function podman_commands() {
dprint "$@"
run_podman help "$@" |\
awk '/^Available Commands:/{ok=1;next}/^Flags:/{ok=0}ok { print $1 }' |\
grep .
"$output"
}
function check_help() {
local count=0
local -A found
for cmd in $(podman_commands "$@"); do
# Human-readable podman command string, with multiple spaces collapsed
command_string="podman $* $cmd"
command_string=${command_string// / } # 'podman x' -> 'podman x'
dprint "$command_string --help"
run_podman "$@" $cmd --help
local full_help="$output"
# The line immediately after 'Usage:' gives us a 1-line synopsis
usage=$(echo "$full_help" | grep -A1 '^Usage:' | tail -1)
[ -n "$usage" ] || die "podman $cmd: no Usage message found"
# e.g. 'podman ps' should not show 'podman container ps' in usage
# Trailing space in usage handles 'podman system renumber' which
# has no ' [flags]'
is "$usage " " $command_string .*" "Usage string matches command"
# If usage ends in '[command]', recurse into subcommands
if expr "$usage" : '.*\[command\]$' >/dev/null; then
found[subcommands]=1
check_help "$@" $cmd
continue
fi
# We had someone write upper-case '[FLAGS]' once. Prevent it.
if expr "$usage" : '.*\[FLAG' >/dev/null; then
die "'flags' string must be lower-case in usage: $usage"
fi
# We had someone do 'podman foo ARG [flags]' one time. Yeah, no.
if expr "$usage" : '.*[A-Z].*\[flag' >/dev/null; then
die "'flags' must precede arguments in usage: $usage"
fi
# Cross-check: if usage includes '[flags]', there must be a
# longer 'Flags:' section in the full --help output; vice-versa,
# if 'Flags:' is in full output, usage line must have '[flags]'.
if expr "$usage" : '.*\[flag' >/dev/null; then
if ! expr "$full_help" : ".*Flags:" >/dev/null; then
die "$command_string: Usage includes '[flags]' but has no 'Flags:' subsection"
fi
elif expr "$full_help" : ".*Flags:" >/dev/null; then
die "$command_string: --help has 'Flags:' section but no '[flags]' in synopsis"
fi
# If usage lists no arguments (strings in ALL CAPS), confirm
# by running with 'invalid-arg' and expecting failure.
if ! expr "$usage" : '.*[A-Z]' >/dev/null; then
if [ "$cmd" != "help" ]; then
dprint "$command_string invalid-arg"
run_podman '?' "$@" $cmd invalid-arg
is "$status" 125 "'$command_string invalid-arg' - exit status"
is "$output" "Error: .* takes no arguments" \
"'$command_string' with extra (invalid) arguments"
fi
found[takes_no_args]=1
fi
# If usage has required arguments, try running without them.
# The expression here is 'first capital letter is not in [BRACKETS]'.
# It is intended to handle 'podman foo [flags] ARG' but not ' [ARG]'.
if expr "$usage" : '[^A-Z]\+ [A-Z]' >/dev/null; then
# Exceptions: these commands don't work rootless
if is_rootless; then
# "pause is not supported for rootless containers"
if [ "$cmd" = "pause" -o "$cmd" = "unpause" ]; then
continue
fi
# "network rm" too
if [ "$@" = "network" -a "$cmd" = "rm" ]; then
continue
fi
fi
# The </dev/null protects us from 'podman login' which will
# try to read username/password from stdin.
dprint "$command_string (without required args)"
run_podman '?' "$@" $cmd </dev/null
is "$status" 125 "'$command_string' with no arguments - exit status"
is "$output" "Error:.* \(require\|specif\|must\|provide\|need\|choose\|accepts\)" \
"'$command_string' without required arg"
found[required_args]=1
fi
# Commands with fixed number of arguments (i.e. no ellipsis): count
# the required args, then invoke with one extra. We should get a
# usage error.
if ! expr "$usage" : ".*\.\.\."; then
# "podman help" can take infinite args, so skip that one
if [ "$cmd" != "help" ]; then
# Get the args part of the command line; this should be
# everything from the first CAPITAL LETTER onward. We
# don't actually care about the letter itself, so just
# make it 'X'. And we don't care about [OPTIONAL] brackets
# either. What we do care about is stuff like 'IMAGE | CTR'
# which is actually one argument; convert to 'IMAGE-or-CTR'
local rhs=$(sed -e 's/^[^A-Z]\+[A-Z]/X/' -e 's/ | /-or-/g' <<<"$usage")
local n_args=$(wc -w <<<"$rhs")
run_podman '?' "$@" $cmd $(seq --format='x%g' 0 $n_args)
is "$status" 125 "'$command_string' with >$n_args arguments - exit status"
is "$output" "Error:.* \(takes no arguments\|requires exactly $n_args arg\|accepts at most\|too many arguments\|accepts $n_args arg(s), received\|accepts between .* and .* arg(s), received \)" \
"'$command_string' with >$n_args arguments"
found[fixed_args]=1
fi
fi
count=$(expr $count + 1)
done
# Any command that takes subcommands, must throw error if called
# without one.
dprint "podman $@"
run_podman '?' "$@"
is "$status" 125 "'podman $*' without any subcommand - exit status"
is "$output" "Error: missing command .*$@ COMMAND" \
"'podman $*' without any subcommand - expected error message"
# Assume that 'NoSuchCommand' is not a command
dprint "podman $@ NoSuchCommand"
run_podman '?' "$@" NoSuchCommand
is "$status" 125 "'podman $* NoSuchCommand' - exit status"
is "$output" "Error: unrecognized command .*$@ NoSuchCommand" \
"'podman $* NoSuchCommand' - expected error message"
# This can happen if the output of --help changes, such as between
# the old command parser and cobra.
[ $count -gt 0 ] || \
die "Internal error: no commands found in 'podman help $@' list"
# Sanity check: make sure the special loops above triggered at least once.
# (We've had situations where a typo makes the conditional never run)
if [ -z "$*" ]; then
for i in subcommands required_args takes_no_args fixed_args; do
if [[ -z ${found[$i]} ]]; then
die "Internal error: '$i' subtest did not trigger"
fi
done
fi
}
@test "podman help - basic tests" {
skip_if_remote
# Called with no args -- start with 'podman --help'. check_help() will
# recurse for any subcommands.
check_help
}
# vim: filetype=sh