ShellCheck-0.9.0: src/ShellCheck/Checks/ShellSupport.hs
{-
Copyright 2012-2020 Vidar Holen
This file is part of ShellCheck.
https://www.shellcheck.net
ShellCheck is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
ShellCheck is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE FlexibleContexts #-}
module ShellCheck.Checks.ShellSupport (checker , ShellCheck.Checks.ShellSupport.runTests) where
import ShellCheck.AST
import ShellCheck.ASTLib
import ShellCheck.AnalyzerLib
import ShellCheck.Interface
import ShellCheck.Prelude
import ShellCheck.Regex
import Control.Monad
import Control.Monad.RWS
import Data.Char
import Data.Functor.Identity
import Data.List
import Data.Maybe
import qualified Data.Map as Map
import qualified Data.Set as Set
import Test.QuickCheck.All (forAllProperties)
import Test.QuickCheck.Test (quickCheckWithResult, stdArgs, maxSuccess)
data ForShell = ForShell [Shell] (Token -> Analysis)
getChecker params list = Checker {
perScript = nullCheck,
perToken = foldl composeAnalyzers nullCheck $ mapMaybe include list
}
where
shell = shellType params
include (ForShell list a) = do
guard $ shell `elem` list
return a
checker params = getChecker params checks
checks = [
checkForDecimals
,checkBashisms
,checkEchoSed
,checkBraceExpansionVars
,checkMultiDimensionalArrays
,checkPS1Assignments
]
testChecker (ForShell _ t) =
Checker {
perScript = nullCheck,
perToken = t
}
verify c s = producesComments (testChecker c) s == Just True
verifyNot c s = producesComments (testChecker c) s == Just False
prop_checkForDecimals1 = verify checkForDecimals "((3.14*c))"
prop_checkForDecimals2 = verify checkForDecimals "foo[1.2]=bar"
prop_checkForDecimals3 = verifyNot checkForDecimals "declare -A foo; foo[1.2]=bar"
checkForDecimals = ForShell [Sh, Dash, Bash] f
where
f t@(TA_Expansion id _) = sequence_ $ do
str <- getLiteralString t
first <- str !!! 0
guard $ isDigit first && '.' `elem` str
return $ err id 2079 "(( )) doesn't support decimals. Use bc or awk."
f _ = return ()
prop_checkBashisms = verify checkBashisms "while read a; do :; done < <(a)"
prop_checkBashisms2 = verify checkBashisms "[ foo -nt bar ]"
prop_checkBashisms3 = verify checkBashisms "echo $((i++))"
prop_checkBashisms4 = verify checkBashisms "rm !(*.hs)"
prop_checkBashisms5 = verify checkBashisms "source file"
prop_checkBashisms6 = verify checkBashisms "[ \"$a\" == 42 ]"
prop_checkBashisms7 = verify checkBashisms "echo ${var[1]}"
prop_checkBashisms8 = verify checkBashisms "echo ${!var[@]}"
prop_checkBashisms9 = verify checkBashisms "echo ${!var*}"
prop_checkBashisms10 = verify checkBashisms "echo ${var:4:12}"
prop_checkBashisms11 = verifyNot checkBashisms "echo ${var:-4}"
prop_checkBashisms12 = verify checkBashisms "echo ${var//foo/bar}"
prop_checkBashisms13 = verify checkBashisms "exec -c env"
prop_checkBashisms14 = verify checkBashisms "echo -n \"Foo: \""
prop_checkBashisms15 = verify checkBashisms "let n++"
prop_checkBashisms16 = verify checkBashisms "echo $RANDOM"
prop_checkBashisms17 = verify checkBashisms "echo $((RANDOM%6+1))"
prop_checkBashisms18 = verify checkBashisms "foo &> /dev/null"
prop_checkBashisms19 = verify checkBashisms "foo > file*.txt"
prop_checkBashisms20 = verify checkBashisms "read -ra foo"
prop_checkBashisms21 = verify checkBashisms "[ -a foo ]"
prop_checkBashisms22 = verifyNot checkBashisms "[ foo -a bar ]"
prop_checkBashisms23 = verify checkBashisms "trap mything ERR INT"
prop_checkBashisms24 = verifyNot checkBashisms "trap mything INT TERM"
prop_checkBashisms25 = verify checkBashisms "cat < /dev/tcp/host/123"
prop_checkBashisms26 = verify checkBashisms "trap mything ERR SIGTERM"
prop_checkBashisms27 = verify checkBashisms "echo *[^0-9]*"
prop_checkBashisms28 = verify checkBashisms "exec {n}>&2"
prop_checkBashisms29 = verify checkBashisms "echo ${!var}"
prop_checkBashisms30 = verify checkBashisms "printf -v '%s' \"$1\""
prop_checkBashisms31 = verify checkBashisms "printf '%q' \"$1\""
prop_checkBashisms32 = verifyNot checkBashisms "#!/bin/dash\n[ foo -nt bar ]"
prop_checkBashisms33 = verify checkBashisms "#!/bin/sh\necho -n foo"
prop_checkBashisms34 = verifyNot checkBashisms "#!/bin/dash\necho -n foo"
prop_checkBashisms35 = verifyNot checkBashisms "#!/bin/dash\nlocal foo"
prop_checkBashisms36 = verifyNot checkBashisms "#!/bin/dash\nread -p foo -r bar"
prop_checkBashisms37 = verifyNot checkBashisms "HOSTNAME=foo; echo $HOSTNAME"
prop_checkBashisms38 = verify checkBashisms "RANDOM=9; echo $RANDOM"
prop_checkBashisms39 = verify checkBashisms "foo-bar() { true; }"
prop_checkBashisms40 = verify checkBashisms "echo $(<file)"
prop_checkBashisms41 = verify checkBashisms "echo `<file`"
prop_checkBashisms42 = verify checkBashisms "trap foo int"
prop_checkBashisms43 = verify checkBashisms "trap foo sigint"
prop_checkBashisms44 = verifyNot checkBashisms "#!/bin/dash\ntrap foo int"
prop_checkBashisms45 = verifyNot checkBashisms "#!/bin/dash\ntrap foo INT"
prop_checkBashisms46 = verify checkBashisms "#!/bin/dash\ntrap foo SIGINT"
prop_checkBashisms47 = verify checkBashisms "#!/bin/dash\necho foo 42>/dev/null"
prop_checkBashisms48 = verifyNot checkBashisms "#!/bin/sh\necho $LINENO"
prop_checkBashisms49 = verify checkBashisms "#!/bin/dash\necho $MACHTYPE"
prop_checkBashisms50 = verify checkBashisms "#!/bin/sh\ncmd >& file"
prop_checkBashisms51 = verifyNot checkBashisms "#!/bin/sh\ncmd 2>&1"
prop_checkBashisms52 = verifyNot checkBashisms "#!/bin/sh\ncmd >&2"
prop_checkBashisms52b = verifyNot checkBashisms "#!/bin/sh\ncmd >& $var"
prop_checkBashisms52c = verify checkBashisms "#!/bin/sh\ncmd >& $dir/$var"
prop_checkBashisms53 = verifyNot checkBashisms "#!/bin/sh\nprintf -- -f\n"
prop_checkBashisms54 = verify checkBashisms "#!/bin/sh\nfoo+=bar"
prop_checkBashisms55 = verify checkBashisms "#!/bin/sh\necho ${@%foo}"
prop_checkBashisms56 = verifyNot checkBashisms "#!/bin/sh\necho ${##}"
prop_checkBashisms57 = verifyNot checkBashisms "#!/bin/dash\nulimit -c 0"
prop_checkBashisms58 = verify checkBashisms "#!/bin/sh\nulimit -c 0"
prop_checkBashisms59 = verify checkBashisms "#!/bin/sh\njobs -s"
prop_checkBashisms60 = verifyNot checkBashisms "#!/bin/sh\njobs -p"
prop_checkBashisms61 = verifyNot checkBashisms "#!/bin/sh\njobs -lp"
prop_checkBashisms62 = verify checkBashisms "#!/bin/sh\nexport -f foo"
prop_checkBashisms63 = verifyNot checkBashisms "#!/bin/sh\nexport -p"
prop_checkBashisms64 = verify checkBashisms "#!/bin/sh\nreadonly -a"
prop_checkBashisms65 = verifyNot checkBashisms "#!/bin/sh\nreadonly -p"
prop_checkBashisms66 = verifyNot checkBashisms "#!/bin/sh\ncd -P ."
prop_checkBashisms67 = verify checkBashisms "#!/bin/sh\ncd -P -e ."
prop_checkBashisms68 = verify checkBashisms "#!/bin/sh\numask -p"
prop_checkBashisms69 = verifyNot checkBashisms "#!/bin/sh\numask -S"
prop_checkBashisms70 = verify checkBashisms "#!/bin/sh\ntrap -l"
prop_checkBashisms71 = verify checkBashisms "#!/bin/sh\ntype -a ls"
prop_checkBashisms72 = verifyNot checkBashisms "#!/bin/sh\ntype ls"
prop_checkBashisms73 = verify checkBashisms "#!/bin/sh\nunset -n namevar"
prop_checkBashisms74 = verifyNot checkBashisms "#!/bin/sh\nunset -f namevar"
prop_checkBashisms75 = verifyNot checkBashisms "#!/bin/sh\necho \"-n foo\""
prop_checkBashisms76 = verifyNot checkBashisms "#!/bin/sh\necho \"-ne foo\""
prop_checkBashisms77 = verifyNot checkBashisms "#!/bin/sh\necho -Q foo"
prop_checkBashisms78 = verify checkBashisms "#!/bin/sh\necho -ne foo"
prop_checkBashisms79 = verify checkBashisms "#!/bin/sh\nhash -l"
prop_checkBashisms80 = verifyNot checkBashisms "#!/bin/sh\nhash -r"
prop_checkBashisms81 = verifyNot checkBashisms "#!/bin/dash\nhash -v"
prop_checkBashisms82 = verifyNot checkBashisms "#!/bin/sh\nset -v +o allexport -o errexit -C"
prop_checkBashisms83 = verifyNot checkBashisms "#!/bin/sh\nset --"
prop_checkBashisms84 = verify checkBashisms "#!/bin/sh\nset -o pipefail"
prop_checkBashisms85 = verify checkBashisms "#!/bin/sh\nset -B"
prop_checkBashisms86 = verifyNot checkBashisms "#!/bin/dash\nset -o emacs"
prop_checkBashisms87 = verify checkBashisms "#!/bin/sh\nset -o emacs"
prop_checkBashisms88 = verifyNot checkBashisms "#!/bin/sh\nset -- wget -o foo 'https://some.url'"
prop_checkBashisms89 = verifyNot checkBashisms "#!/bin/sh\nopts=$-\nset -\"$opts\""
prop_checkBashisms90 = verifyNot checkBashisms "#!/bin/sh\nset -o \"$opt\""
prop_checkBashisms91 = verify checkBashisms "#!/bin/sh\nwait -n"
prop_checkBashisms92 = verify checkBashisms "#!/bin/sh\necho $((16#FF))"
prop_checkBashisms93 = verify checkBashisms "#!/bin/sh\necho $(( 10#$(date +%m) ))"
prop_checkBashisms94 = verify checkBashisms "#!/bin/sh\n[ -v var ]"
prop_checkBashisms95 = verify checkBashisms "#!/bin/sh\necho $_"
prop_checkBashisms96 = verifyNot checkBashisms "#!/bin/dash\necho $_"
prop_checkBashisms97 = verify checkBashisms "#!/bin/sh\necho ${var,}"
prop_checkBashisms98 = verify checkBashisms "#!/bin/sh\necho ${var^^}"
prop_checkBashisms99 = verify checkBashisms "#!/bin/dash\necho [^f]oo"
checkBashisms = ForShell [Sh, Dash] $ \t -> do
params <- ask
kludge params t
where
-- This code was copy-pasted from Analytics where params was a variable
kludge params = bashism
where
isDash = shellType params == Dash
warnMsg id code s =
if isDash
then err id code $ "In dash, " ++ s ++ " not supported."
else warn id code $ "In POSIX sh, " ++ s ++ " undefined."
bashism (T_ProcSub id _ _) = warnMsg id 3001 "process substitution is"
bashism (T_Extglob id _ _) = warnMsg id 3002 "extglob is"
bashism (T_DollarSingleQuoted id _) = warnMsg id 3003 "$'..' is"
bashism (T_DollarDoubleQuoted id _) = warnMsg id 3004 "$\"..\" is"
bashism (T_ForArithmetic id _ _ _ _) = warnMsg id 3005 "arithmetic for loops are"
bashism (T_Arithmetic id _) = warnMsg id 3006 "standalone ((..)) is"
bashism (T_DollarBracket id _) = warnMsg id 3007 "$[..] in place of $((..)) is"
bashism (T_SelectIn id _ _ _) = warnMsg id 3008 "select loops are"
bashism (T_BraceExpansion id _) = warnMsg id 3009 "brace expansion is"
bashism (T_Condition id DoubleBracket _) = warnMsg id 3010 "[[ ]] is"
bashism (T_HereString id _) = warnMsg id 3011 "here-strings are"
bashism (TC_Binary id SingleBracket op _ _)
| op `elem` [ "<", ">", "\\<", "\\>", "<=", ">=", "\\<=", "\\>="] =
unless isDash $ warnMsg id 3012 $ "lexicographical " ++ op ++ " is"
bashism (TC_Binary id SingleBracket op _ _)
| op `elem` [ "-ot", "-nt", "-ef" ] =
unless isDash $ warnMsg id 3013 $ op ++ " is"
bashism (TC_Binary id SingleBracket "==" _ _) =
warnMsg id 3014 "== in place of = is"
bashism (TC_Binary id SingleBracket "=~" _ _) =
warnMsg id 3015 "=~ regex matching is"
bashism (TC_Unary id SingleBracket "-v" _) =
warnMsg id 3016 "unary -v (in place of [ -n \"${var+x}\" ]) is"
bashism (TC_Unary id _ "-a" _) =
warnMsg id 3017 "unary -a in place of -e is"
bashism (TA_Unary id op _)
| op `elem` [ "|++", "|--", "++|", "--|"] =
warnMsg id 3018 $ filter (/= '|') op ++ " is"
bashism (TA_Binary id "**" _ _) = warnMsg id 3019 "exponentials are"
bashism (T_FdRedirect id "&" (T_IoFile _ (T_Greater _) _)) = warnMsg id 3020 "&> is"
bashism (T_FdRedirect id "" (T_IoFile _ (T_GREATAND _) file)) =
unless (all isDigit $ onlyLiteralString file) $ warnMsg id 3021 ">& filename (as opposed to >& fd) is"
bashism (T_FdRedirect id ('{':_) _) = warnMsg id 3022 "named file descriptors are"
bashism (T_FdRedirect id num _)
| all isDigit num && length num > 1 = warnMsg id 3023 "FDs outside 0-9 are"
bashism (T_Assignment id Append _ _ _) =
warnMsg id 3024 "+= is"
bashism (T_IoFile id _ word) | isNetworked =
warnMsg id 3025 "/dev/{tcp,udp} is"
where
file = onlyLiteralString word
isNetworked = any (`isPrefixOf` file) ["/dev/tcp", "/dev/udp"]
bashism (T_Glob id str) | "[^" `isInfixOf` str =
warnMsg id 3026 "^ in place of ! in glob bracket expressions is"
bashism t@(TA_Variable id str _) | isBashVariable str =
warnMsg id 3028 $ str ++ " is"
bashism t@(T_DollarBraced id _ token) = do
mapM_ check expansion
when (isBashVariable var) $
warnMsg id 3028 $ var ++ " is"
where
str = concat $ oversimplify token
var = getBracedReference str
check (regex, code, feature) =
when (isJust $ matchRegex regex str) $ warnMsg id code feature
bashism t@(T_Pipe id "|&") =
warnMsg id 3029 "|& in place of 2>&1 | is"
bashism (T_Array id _) =
warnMsg id 3030 "arrays are"
bashism (T_IoFile id _ t) | isGlob t =
warnMsg id 3031 "redirecting to/from globs is"
bashism (T_CoProc id _ _) =
warnMsg id 3032 "coproc is"
bashism (T_Function id _ _ str _) | not (isVariableName str) =
warnMsg id 3033 "naming functions outside [a-zA-Z_][a-zA-Z0-9_]* is"
bashism (T_DollarExpansion id [x]) | isOnlyRedirection x =
warnMsg id 3034 "$(<file) to read files is"
bashism (T_Backticked id [x]) | isOnlyRedirection x =
warnMsg id 3035 "`<file` to read files is"
bashism t@(T_SimpleCommand _ _ (cmd:arg:_))
| t `isCommand` "echo" && argString `matches` flagRegex =
if isDash
then
when (argString /= "-n") $
warnMsg (getId arg) 3036 "echo flags besides -n"
else
warnMsg (getId arg) 3037 "echo flags are"
where
argString = concat $ oversimplify arg
flagRegex = mkRegex "^-[eEsn]+$"
bashism t@(T_SimpleCommand _ _ (cmd:arg:_))
| getLiteralString cmd == Just "exec" && "-" `isPrefixOf` concat (oversimplify arg) =
warnMsg (getId arg) 3038 "exec flags are"
bashism t@(T_SimpleCommand id _ _)
| t `isCommand` "let" = warnMsg id 3039 "'let' is"
bashism t@(T_SimpleCommand _ _ (cmd:args))
| t `isCommand` "set" = unless isDash $
checkOptions $ getLiteralArgs args
where
-- Get the literal options from a list of arguments,
-- up until the first non-literal one
getLiteralArgs :: [Token] -> [(Id, String)]
getLiteralArgs = foldr go []
where
go first rest = case getLiteralString first of
Just str -> (getId first, str) : rest
Nothing -> []
-- Check a flag-option pair (such as -o errexit)
checkOptions (flag@(fid,flag') : opt@(oid,opt') : rest)
| flag' `matches` oFlagRegex = do
when (opt' `notElem` longOptions) $
warnMsg oid 3040 $ "set option " <> opt' <> " is"
checkFlags (flag:rest)
| otherwise = checkFlags (flag:opt:rest)
checkOptions (flag:rest) = checkFlags (flag:rest)
checkOptions _ = return ()
-- Check that each option in a sequence of flags
-- (such as -aveo) is valid
checkFlags (flag@(fid, flag'):rest)
| startsOption flag' = do
unless (flag' `matches` validFlagsRegex) $
forM_ (tail flag') $ \letter ->
when (letter `notElem` optionsSet) $
warnMsg fid 3041 $ "set flag " <> ('-':letter:" is")
checkOptions rest
| beginsWithDoubleDash flag' = do
warnMsg fid 3042 $ "set flag " <> flag' <> " is"
checkOptions rest
-- Either a word that doesn't start with a dash, or simply '--',
-- so stop checking.
| otherwise = return ()
checkFlags [] = return ()
options = "abCefhmnuvxo"
optionsSet = Set.fromList options
startsOption = (`matches` mkRegex "^(\\+|-[^-])")
oFlagRegex = mkRegex $ "^[-+][" <> options <> "]*o$"
validFlagsRegex = mkRegex $ "^[-+]([" <> options <> "]+o?|o)$"
beginsWithDoubleDash = (`matches` mkRegex "^--.+$")
longOptions = Set.fromList
[ "allexport", "errexit", "ignoreeof", "monitor", "noclobber"
, "noexec", "noglob", "nolog", "notify" , "nounset", "verbose"
, "vi", "xtrace" ]
bashism t@(T_SimpleCommand id _ (cmd:rest)) =
let name = fromMaybe "" $ getCommandName t
flags = getLeadingFlags t
in do
when (name == "local" && not isDash) $
-- This is so commonly accepted that we'll make it a special case
warnMsg id 3043 $ "'local' is"
when (name `elem` unsupportedCommands) $
warnMsg id 3044 $ "'" ++ name ++ "' is"
sequence_ $ do
allowed' <- Map.lookup name allowedFlags
allowed <- allowed'
(word, flag) <- find
(\x -> (not . null . snd $ x) && snd x `notElem` allowed) flags
return . warnMsg (getId word) 3045 $ name ++ " -" ++ flag ++ " is"
when (name == "source") $ warnMsg id 3046 "'source' in place of '.' is"
when (name == "trap") $
let
check token = sequence_ $ do
str <- getLiteralString token
let upper = map toUpper str
return $ do
when (upper `elem` ["ERR", "DEBUG", "RETURN"]) $
warnMsg (getId token) 3047 $ "trapping " ++ str ++ " is"
when ("SIG" `isPrefixOf` upper) $
warnMsg (getId token) 3048
"prefixing signal names with 'SIG' is"
when (not isDash && upper /= str) $
warnMsg (getId token) 3049
"using lower/mixed case for signal names is"
in
mapM_ check (drop 1 rest)
when (name == "printf") $ sequence_ $ do
format <- rest !!! 0 -- flags are covered by allowedFlags
let literal = onlyLiteralString format
guard $ "%q" `isInfixOf` literal
return $ warnMsg (getId format) 3050 "printf %q is"
where
unsupportedCommands = [
"let", "caller", "builtin", "complete", "compgen", "declare", "dirs", "disown",
"enable", "mapfile", "readarray", "pushd", "popd", "shopt", "suspend",
"typeset"
]
allowedFlags = Map.fromList [
("cd", Just ["L", "P"]),
("exec", Just []),
("export", Just ["p"]),
("hash", Just $ if isDash then ["r", "v"] else ["r"]),
("jobs", Just ["l", "p"]),
("printf", Just []),
("read", Just $ if isDash then ["r", "p"] else ["r"]),
("readonly", Just ["p"]),
("trap", Just []),
("type", Just []),
("ulimit", if isDash then Nothing else Just ["f"]),
("umask", Just ["S"]),
("unset", Just ["f", "v"]),
("wait", Just [])
]
bashism t@(T_SourceCommand id src _)
| getCommandName src == Just "source" = warnMsg id 3051 "'source' in place of '.' is"
bashism (TA_Expansion _ (T_Literal id str : _))
| str `matches` radix = warnMsg id 3052 "arithmetic base conversion is"
where
radix = mkRegex "^[0-9]+#"
bashism _ = return ()
varChars="_0-9a-zA-Z"
expansion = let re = mkRegex in [
(re $ "^![" ++ varChars ++ "]", 3053, "indirect expansion is"),
(re $ "^[" ++ varChars ++ "]+\\[.*\\]$", 3054, "array references are"),
(re $ "^![" ++ varChars ++ "]+\\[[*@]]$", 3055, "array key expansion is"),
(re $ "^![" ++ varChars ++ "]+[*@]$", 3056, "name matching prefixes are"),
(re $ "^[" ++ varChars ++ "*@]+:[^-=?+]", 3057, "string indexing is"),
(re $ "^([*@][%#]|#[@*])", 3058, "string operations on $@/$* are"),
(re $ "^[" ++ varChars ++ "*@]+(\\[.*\\])?[,^]", 3059, "case modification is"),
(re $ "^[" ++ varChars ++ "*@]+(\\[.*\\])?/", 3060, "string replacement is")
]
bashVars = [
-- This list deliberately excludes $BASH_VERSION as it's often used
-- for shell identification.
"OSTYPE", "MACHTYPE", "HOSTTYPE", "HOSTNAME",
"DIRSTACK", "EUID", "UID", "SHLVL", "PIPESTATUS", "SHELLOPTS",
"_", "BASHOPTS", "BASHPID", "BASH_ALIASES", "BASH_ARGC",
"BASH_ARGV", "BASH_ARGV0", "BASH_CMDS", "BASH_COMMAND",
"BASH_EXECUTION_STRING", "BASH_LINENO", "BASH_REMATCH", "BASH_SOURCE",
"BASH_SUBSHELL", "BASH_VERSINFO", "EPOCHREALTIME", "EPOCHSECONDS",
"FUNCNAME", "GROUPS", "MACHTYPE", "MAPFILE"
]
bashDynamicVars = [ "RANDOM", "SECONDS" ]
dashVars = [ "_" ]
isBashVariable var =
(var `elem` bashDynamicVars
|| var `elem` bashVars && not (isAssigned var))
&& not (isDash && var `elem` dashVars)
isAssigned var = any f (variableFlow params)
where
f x = case x of
Assignment (_, _, name, _) -> name == var
_ -> False
prop_checkEchoSed1 = verify checkEchoSed "FOO=$(echo \"$cow\" | sed 's/foo/bar/g')"
prop_checkEchoSed1b = verify checkEchoSed "FOO=$(sed 's/foo/bar/g' <<< \"$cow\")"
prop_checkEchoSed2 = verify checkEchoSed "rm $(echo $cow | sed -e 's,foo,bar,')"
prop_checkEchoSed2b = verify checkEchoSed "rm $(sed -e 's,foo,bar,' <<< $cow)"
checkEchoSed = ForShell [Bash, Ksh] f
where
f (T_Redirecting id lefts r) =
when (any redirectHereString lefts) $
checkSed id rcmd
where
redirectHereString :: Token -> Bool
redirectHereString t = case t of
(T_FdRedirect _ _ T_HereString{}) -> True
_ -> False
rcmd = oversimplify r
f (T_Pipeline id _ [a, b]) =
when (acmd == ["echo", "${VAR}"]) $
checkSed id bcmd
where
acmd = oversimplify a
bcmd = oversimplify b
f _ = return ()
checkSed id ["sed", v] = checkIn id v
checkSed id ["sed", "-e", v] = checkIn id v
checkSed _ _ = return ()
-- This should have used backreferences, but TDFA doesn't support them
sedRe = mkRegex "^s(.)([^\n]*)g?$"
isSimpleSed s = isJust $ do
[h:_,rest] <- matchRegex sedRe s
let delimiters = filter (== h) rest
guard $ length delimiters == 2
checkIn id s =
when (isSimpleSed s) $
style id 2001 "See if you can use ${variable//search/replace} instead."
prop_checkBraceExpansionVars1 = verify checkBraceExpansionVars "echo {1..$n}"
prop_checkBraceExpansionVars2 = verifyNot checkBraceExpansionVars "echo {1,3,$n}"
prop_checkBraceExpansionVars3 = verify checkBraceExpansionVars "eval echo DSC{0001..$n}.jpg"
prop_checkBraceExpansionVars4 = verify checkBraceExpansionVars "echo {$i..100}"
checkBraceExpansionVars = ForShell [Bash] f
where
f t@(T_BraceExpansion id list) = mapM_ check list
where
check element =
when (any (`isInfixOf` toString element) ["$..", "..$"]) $ do
c <- isEvaled element
if c
then style id 2175 "Quote this invalid brace expansion since it should be passed literally to eval."
else warn id 2051 "Bash doesn't support variables in brace range expansions."
f _ = return ()
literalExt t =
case t of
T_DollarBraced {} -> return "$"
T_DollarExpansion {} -> return "$"
T_DollarArithmetic {} -> return "$"
_ -> return "-"
toString t = runIdentity $ getLiteralStringExt literalExt t
isEvaled t = do
cmd <- getClosestCommandM t
return $ maybe False (`isUnqualifiedCommand` "eval") cmd
prop_checkMultiDimensionalArrays1 = verify checkMultiDimensionalArrays "foo[a][b]=3"
prop_checkMultiDimensionalArrays2 = verifyNot checkMultiDimensionalArrays "foo[a]=3"
prop_checkMultiDimensionalArrays3 = verify checkMultiDimensionalArrays "foo=( [a][b]=c )"
prop_checkMultiDimensionalArrays4 = verifyNot checkMultiDimensionalArrays "foo=( [a]=c )"
prop_checkMultiDimensionalArrays5 = verify checkMultiDimensionalArrays "echo ${foo[bar][baz]}"
prop_checkMultiDimensionalArrays6 = verifyNot checkMultiDimensionalArrays "echo ${foo[bar]}"
checkMultiDimensionalArrays = ForShell [Bash] f
where
f token =
case token of
T_Assignment _ _ name (first:second:_) _ -> about second
T_IndexedElement _ (first:second:_) _ -> about second
T_DollarBraced _ _ l ->
when (isMultiDim l) $ about token
_ -> return ()
about t = warn (getId t) 2180 "Bash does not support multidimensional arrays. Use 1D or associative arrays."
re = mkRegex "^\\[.*\\]\\[.*\\]" -- Fixme, this matches ${foo:- [][]} and such as well
isMultiDim l = getBracedModifier (concat $ oversimplify l) `matches` re
prop_checkPS11 = verify checkPS1Assignments "PS1='\\033[1;35m\\$ '"
prop_checkPS11a = verify checkPS1Assignments "export PS1='\\033[1;35m\\$ '"
prop_checkPSf2 = verify checkPS1Assignments "PS1='\\h \\e[0m\\$ '"
prop_checkPS13 = verify checkPS1Assignments "PS1=$'\\x1b[c '"
prop_checkPS14 = verify checkPS1Assignments "PS1=$'\\e[3m; '"
prop_checkPS14a = verify checkPS1Assignments "export PS1=$'\\e[3m; '"
prop_checkPS15 = verifyNot checkPS1Assignments "PS1='\\[\\033[1;35m\\]\\$ '"
prop_checkPS16 = verifyNot checkPS1Assignments "PS1='\\[\\e1m\\e[1m\\]\\$ '"
prop_checkPS17 = verifyNot checkPS1Assignments "PS1='e033x1B'"
prop_checkPS18 = verifyNot checkPS1Assignments "PS1='\\[\\e\\]'"
checkPS1Assignments = ForShell [Bash] f
where
f token = case token of
(T_Assignment _ _ "PS1" _ word) -> warnFor word
_ -> return ()
warnFor word =
let contents = concat $ oversimplify word in
when (containsUnescaped contents) $
info (getId word) 2025 "Make sure all escape sequences are enclosed in \\[..\\] to prevent line wrapping issues"
containsUnescaped s =
let unenclosed = subRegex enclosedRegex s "" in
isJust $ matchRegex escapeRegex unenclosed
enclosedRegex = mkRegex "\\\\\\[.*\\\\\\]" -- FIXME: shouldn't be eager
escapeRegex = mkRegex "\\\\x1[Bb]|\\\\e|\x1B|\\\\033"
return []
runTests = $( [| $(forAllProperties) (quickCheckWithResult (stdArgs { maxSuccess = 1 }) ) |])