mirror of
https://github.com/NixOS/nix.git
synced 2024-11-25 16:23:02 +00:00
nix develop: Don't parse bash environment with regexes
Instead have get-env.sh dump the bash environment as JSON. This should be a lot less error-prone. Fixes #4992.
This commit is contained in:
Eelco Dolstra
parent
b1cfe8f984
commit
b1f1347ade
@ -8,7 +8,7 @@
|
||||
#include "affinity.hh"
|
||||
#include "progress-bar.hh"
|
||||
|
||||
#include <regex>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using namespace nix;
|
||||
|
||||
@ -25,94 +25,98 @@ static DevelopSettings developSettings;
|
||||
|
||||
static GlobalConfig::Register rDevelopSettings(&developSettings);
|
||||
|
||||
struct Var
|
||||
{
|
||||
bool exported = true;
|
||||
bool associative = false;
|
||||
std::string quoted; // quoted string or array
|
||||
};
|
||||
|
||||
struct BuildEnvironment
|
||||
{
|
||||
std::map<std::string, Var> env;
|
||||
std::string bashFunctions;
|
||||
};
|
||||
struct String
|
||||
{
|
||||
bool exported;
|
||||
std::string value;
|
||||
};
|
||||
|
||||
BuildEnvironment readEnvironment(const Path & path)
|
||||
{
|
||||
BuildEnvironment res;
|
||||
using Array = std::vector<std::string>;
|
||||
|
||||
std::set<std::string> exported;
|
||||
using Associative = std::map<std::string, std::string>;
|
||||
|
||||
debug("reading environment file '%s'", path);
|
||||
using Value = std::variant<String, Array, Associative>;
|
||||
|
||||
auto file = readFile(path);
|
||||
std::map<std::string, Value> vars;
|
||||
std::map<std::string, std::string> bashFunctions;
|
||||
|
||||
auto pos = file.cbegin();
|
||||
static BuildEnvironment fromJSON(const Path & path)
|
||||
{
|
||||
BuildEnvironment res;
|
||||
|
||||
static std::string varNameRegex =
|
||||
R"re((?:[a-zA-Z_][a-zA-Z0-9_]*))re";
|
||||
std::set<std::string> exported;
|
||||
|
||||
static std::string simpleStringRegex =
|
||||
R"re((?:[a-zA-Z0-9_/:\.\-\+=@%]*))re";
|
||||
debug("reading environment file '%s'", path);
|
||||
|
||||
static std::string dquotedStringRegex =
|
||||
R"re((?:\$?"(?:[^"\\]|\\[$`"\\\n])*"))re";
|
||||
auto json = nlohmann::json::parse(readFile(path));
|
||||
|
||||
static std::string squotedStringRegex =
|
||||
R"re((?:\$?(?:'(?:[^'\\]|\\[abeEfnrtv\\'"?])*'|\\')+))re";
|
||||
|
||||
static std::string indexedArrayRegex =
|
||||
R"re((?:\(( *\[[0-9]+\]="(?:[^"\\]|\\.)*")*\)))re";
|
||||
|
||||
static std::regex declareRegex(
|
||||
"^declare -a?x (" + varNameRegex + ")(=(" +
|
||||
dquotedStringRegex + "|" + indexedArrayRegex + "))?\n");
|
||||
|
||||
static std::regex varRegex(
|
||||
"^(" + varNameRegex + ")=(" + simpleStringRegex + "|" + squotedStringRegex + "|" + indexedArrayRegex + ")\n");
|
||||
|
||||
/* Note: we distinguish between an indexed and associative array
|
||||
using the space before the closing parenthesis. Will
|
||||
undoubtedly regret this some day. */
|
||||
static std::regex assocArrayRegex(
|
||||
"^(" + varNameRegex + ")=" + R"re((?:\(( *\[[^\]]+\]="(?:[^"\\]|\\.)*")* *\)))re" + "\n");
|
||||
|
||||
static std::regex functionRegex(
|
||||
"^" + varNameRegex + " \\(\\) *\n");
|
||||
|
||||
while (pos != file.end()) {
|
||||
|
||||
std::smatch match;
|
||||
|
||||
if (std::regex_search(pos, file.cend(), match, declareRegex, std::regex_constants::match_continuous)) {
|
||||
pos = match[0].second;
|
||||
exported.insert(match[1]);
|
||||
for (auto & [name, info] : json["variables"].items()) {
|
||||
std::string type = info["type"];
|
||||
if (type == "var" || type == "exported")
|
||||
res.vars.insert({name, BuildEnvironment::String { .exported = type == "exported", .value = info["value"] }});
|
||||
else if (type == "array")
|
||||
res.vars.insert({name, (Array) info["value"]});
|
||||
else if (type == "associative")
|
||||
res.vars.insert({name, (Associative) info["value"]});
|
||||
}
|
||||
|
||||
else if (std::regex_search(pos, file.cend(), match, varRegex, std::regex_constants::match_continuous)) {
|
||||
pos = match[0].second;
|
||||
res.env.insert({match[1], Var { .exported = exported.count(match[1]) > 0, .quoted = match[2] }});
|
||||
for (auto & [name, def] : json["bashFunctions"].items()) {
|
||||
res.bashFunctions.insert({name, def});
|
||||
}
|
||||
|
||||
else if (std::regex_search(pos, file.cend(), match, assocArrayRegex, std::regex_constants::match_continuous)) {
|
||||
pos = match[0].second;
|
||||
res.env.insert({match[1], Var { .associative = true, .quoted = match[2] }});
|
||||
}
|
||||
|
||||
else if (std::regex_search(pos, file.cend(), match, functionRegex, std::regex_constants::match_continuous)) {
|
||||
res.bashFunctions = std::string(pos, file.cend());
|
||||
break;
|
||||
}
|
||||
|
||||
else throw Error("shell environment '%s' has unexpected line '%s'",
|
||||
path, file.substr(pos - file.cbegin(), 60));
|
||||
return res;
|
||||
}
|
||||
|
||||
res.env.erase("__output");
|
||||
void toBash(std::ostream & out, const std::set<std::string> & ignoreVars) const
|
||||
{
|
||||
for (auto & [name, value] : vars) {
|
||||
if (!ignoreVars.count(name) && !hasPrefix(name, "BASH_")) {
|
||||
if (auto str = std::get_if<String>(&value)) {
|
||||
out << fmt("%s=%s\n", name, shellEscape(str->value));
|
||||
if (str->exported)
|
||||
out << fmt("export %s\n", name);
|
||||
}
|
||||
else if (auto arr = std::get_if<Array>(&value)) {
|
||||
out << "declare -a " << name << "=(";
|
||||
for (auto & s : *arr)
|
||||
out << shellEscape(s) << " ";
|
||||
out << ")\n";
|
||||
}
|
||||
else if (auto arr = std::get_if<Associative>(&value)) {
|
||||
out << "declare -A " << name << "=(";
|
||||
for (auto & [n, v] : *arr)
|
||||
out << "[" << shellEscape(n) << "]=" << shellEscape(v) << " ";
|
||||
out << ")\n";
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return res;
|
||||
}
|
||||
for (auto & [name, def] : bashFunctions) {
|
||||
out << name << " ()\n{\n" << def << "}\n";
|
||||
}
|
||||
}
|
||||
|
||||
static std::string getString(const Value & value)
|
||||
{
|
||||
if (auto str = std::get_if<String>(&value))
|
||||
return str->value;
|
||||
else
|
||||
throw Error("bash variable is not a string");
|
||||
}
|
||||
|
||||
static Array getStrings(const Value & value)
|
||||
{
|
||||
if (auto str = std::get_if<String>(&value))
|
||||
return tokenizeString<Array>(str->value);
|
||||
else if (auto arr = std::get_if<Array>(&value)) {
|
||||
return *arr;
|
||||
}
|
||||
else
|
||||
throw Error("bash variable is not a string or array");
|
||||
}
|
||||
};
|
||||
|
||||
const static std::string getEnvSh =
|
||||
#include "get-env.sh.gen.hh"
|
||||
@ -185,7 +189,7 @@ StorePath getDerivationEnvironment(ref<Store> store, const StorePath & drvPath)
|
||||
|
||||
struct Common : InstallableCommand, MixProfile
|
||||
{
|
||||
std::set<string> ignoreVars{
|
||||
std::set<std::string> ignoreVars{
|
||||
"BASHOPTS",
|
||||
"EUID",
|
||||
"HOME", // FIXME: don't ignore in pure mode?
|
||||
@ -233,22 +237,10 @@ struct Common : InstallableCommand, MixProfile
|
||||
|
||||
out << "nix_saved_PATH=\"$PATH\"\n";
|
||||
|
||||
for (auto & i : buildEnvironment.env) {
|
||||
if (!ignoreVars.count(i.first) && !hasPrefix(i.first, "BASH_")) {
|
||||
if (i.second.associative)
|
||||
out << fmt("declare -A %s=(%s)\n", i.first, i.second.quoted);
|
||||
else {
|
||||
out << fmt("%s=%s\n", i.first, i.second.quoted);
|
||||
if (i.second.exported)
|
||||
out << fmt("export %s\n", i.first);
|
||||
}
|
||||
}
|
||||
}
|
||||
buildEnvironment.toBash(out, ignoreVars);
|
||||
|
||||
out << "PATH=\"$PATH:$nix_saved_PATH\"\n";
|
||||
|
||||
out << buildEnvironment.bashFunctions << "\n";
|
||||
|
||||
out << "export NIX_BUILD_TOP=\"$(mktemp -d -t nix-shell.XXXXXX)\"\n";
|
||||
for (auto & i : {"TMP", "TMPDIR", "TEMP", "TEMPDIR"})
|
||||
out << fmt("export %s=\"$NIX_BUILD_TOP\"\n", i);
|
||||
@ -258,16 +250,16 @@ struct Common : InstallableCommand, MixProfile
|
||||
auto script = out.str();
|
||||
|
||||
/* Substitute occurrences of output paths. */
|
||||
auto outputs = buildEnvironment.env.find("outputs");
|
||||
assert(outputs != buildEnvironment.env.end());
|
||||
auto outputs = buildEnvironment.vars.find("outputs");
|
||||
assert(outputs != buildEnvironment.vars.end());
|
||||
|
||||
// FIXME: properly unquote 'outputs'.
|
||||
StringMap rewrites;
|
||||
for (auto & outputName : tokenizeString<std::vector<std::string>>(replaceStrings(outputs->second.quoted, "'", ""))) {
|
||||
auto from = buildEnvironment.env.find(outputName);
|
||||
assert(from != buildEnvironment.env.end());
|
||||
for (auto & outputName : BuildEnvironment::getStrings(outputs->second)) {
|
||||
auto from = buildEnvironment.vars.find(outputName);
|
||||
assert(from != buildEnvironment.vars.end());
|
||||
// FIXME: unquote
|
||||
rewrites.insert({from->second.quoted, outputsDir + "/" + outputName});
|
||||
rewrites.insert({BuildEnvironment::getString(from->second), outputsDir + "/" + outputName});
|
||||
}
|
||||
|
||||
/* Substitute redirects. */
|
||||
@ -321,7 +313,7 @@ struct Common : InstallableCommand, MixProfile
|
||||
|
||||
updateProfile(shellOutPath);
|
||||
|
||||
return {readEnvironment(strPath), strPath};
|
||||
return {BuildEnvironment::fromJSON(strPath), strPath};
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
@ -8,10 +8,98 @@ if [[ -n $stdenv ]]; then
|
||||
source $stdenv/setup
|
||||
fi
|
||||
|
||||
# Better to use compgen, but stdenv bash doesn't have it.
|
||||
__vars="$(declare -p)"
|
||||
__functions="$(declare -F)"
|
||||
|
||||
__dumpEnv() {
|
||||
printf '{\n'
|
||||
|
||||
printf ' "bashFunctions": {\n'
|
||||
local __first=1
|
||||
while read __line; do
|
||||
if ! [[ $__line =~ ^declare\ -f\ (.*) ]]; then continue; fi
|
||||
__fun_name="${BASH_REMATCH[1]}"
|
||||
__fun_body="$(type $__fun_name)"
|
||||
if [[ $__fun_body =~ \{(.*)\} ]]; then
|
||||
if [[ -z $__first ]]; then printf ',\n'; else __first=; fi
|
||||
__fun_body="${BASH_REMATCH[1]}"
|
||||
printf " "
|
||||
__escapeString "$__fun_name"
|
||||
printf ':'
|
||||
__escapeString "$__fun_body"
|
||||
else
|
||||
printf "Cannot parse definition of function '%s'.\n" "$__fun_name" >&2
|
||||
return 1
|
||||
fi
|
||||
done < <(printf "%s\n" "$__functions")
|
||||
printf '\n },\n'
|
||||
|
||||
printf ' "variables": {\n'
|
||||
local __first=1
|
||||
while read __line; do
|
||||
if ! [[ $__line =~ ^declare\ (-[^ ])\ ([^=]*) ]]; then continue; fi
|
||||
local type="${BASH_REMATCH[1]}"
|
||||
local __var_name="${BASH_REMATCH[2]}"
|
||||
|
||||
if [[ -z $__first ]]; then printf ',\n'; else __first=; fi
|
||||
|
||||
printf " "
|
||||
__escapeString "$__var_name"
|
||||
printf ': {'
|
||||
|
||||
# FIXME: handle -i, -r, -n.
|
||||
if [[ $type == -x ]]; then
|
||||
printf '"type": "exported", "value": '
|
||||
__escapeString "${!__var_name}"
|
||||
elif [[ $type == -- ]]; then
|
||||
printf '"type": "var", "value": '
|
||||
__escapeString "${!__var_name}"
|
||||
elif [[ $type == -a ]]; then
|
||||
printf '"type": "array", "value": ['
|
||||
local __first2=1
|
||||
__var_name="$__var_name[@]"
|
||||
for __i in "${!__var_name}"; do
|
||||
if [[ -z $__first2 ]]; then printf ', '; else __first2=; fi
|
||||
__escapeString "$__i"
|
||||
printf ' '
|
||||
done
|
||||
printf ']'
|
||||
elif [[ $type == -A ]]; then
|
||||
printf '"type": "associative", "value": {\n'
|
||||
local __first2=1
|
||||
declare -n __var_name2="$__var_name"
|
||||
for __i in "${!__var_name2[@]}"; do
|
||||
if [[ -z $__first2 ]]; then printf ',\n'; else __first2=; fi
|
||||
printf " "
|
||||
__escapeString "$__i"
|
||||
printf ": "
|
||||
__escapeString "${__var_name2[$__i]}"
|
||||
done
|
||||
printf '\n }'
|
||||
else
|
||||
printf '"type": "unknown"'
|
||||
fi
|
||||
|
||||
printf "}"
|
||||
done < <(printf "%s\n" "$__vars")
|
||||
printf '\n }\n}'
|
||||
}
|
||||
|
||||
__escapeString() {
|
||||
local __s="$1"
|
||||
__s="${__s//\\/\\\\}"
|
||||
__s="${__s//\"/\\\"}"
|
||||
__s="${__s//$'\n'/\\n}"
|
||||
__s="${__s//$'\r'/\\r}"
|
||||
__s="${__s//$'\t'/\\t}"
|
||||
printf '"%s"' "$__s"
|
||||
}
|
||||
|
||||
# Dump the bash environment as JSON.
|
||||
for __output in $outputs; do
|
||||
if [[ -z $__done ]]; then
|
||||
export > ${!__output}
|
||||
set >> ${!__output}
|
||||
__dumpEnv > ${!__output}
|
||||
__done=1
|
||||
else
|
||||
echo -n >> ${!__output}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user