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Support KAKOUNE_POSIX_SHELL environment variable to choose the shell path

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The shell will always be run with 'sh' as argv[0] to make shells such
as busybox sh supported.

Closes #2547
This commit is contained in:
Maxime Coste 2018-11-27 22:21:20 +11:00
parent 5250593129
commit d1274836cd
1 changed files with 21 additions and 11 deletions
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32
src/shell_manager.cc
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@ -28,22 +28,32 @@ namespace Kakoune
ShellManager::ShellManager(ConstArrayView<EnvVarDesc> builtin_env_vars)
: m_env_vars{builtin_env_vars}
{
// Get a guaranteed to be POSIX shell binary
auto is_executable = [](StringView path) {
struct stat st;
if (stat(path.zstr(), &st))
return false;
bool executable = (st.st_mode & S_IXUSR)
| (st.st_mode & S_IXGRP)
| (st.st_mode & S_IXOTH);
return S_ISREG(st.st_mode) and executable;
};
if (const char* shell = getenv("KAKOUNE_POSIX_SHELL"))
{
if (not is_executable(shell))
throw runtime_error{format("KAKOUNE_POSIX_SHELL '{}' is not executable", shell)};
m_shell = shell;
}
else // Get a guaranteed to be POSIX shell binary
{
auto size = confstr(_CS_PATH, nullptr, 0);
String path; path.resize(size-1, 0);
confstr(_CS_PATH, path.data(), size);
for (auto dir : StringView{path} | split<StringView>(':'))
{
String candidate = format("{}/sh", dir);
struct stat st;
if (stat(candidate.c_str(), &st))
continue;
bool executable = (st.st_mode & S_IXUSR)
| (st.st_mode & S_IXGRP)
| (st.st_mode & S_IXOTH);
if (S_ISREG(st.st_mode) and executable)
auto candidate = format("{}/sh", dir);
if (is_executable(candidate))
{
m_shell = std::move(candidate);
break;
@ -100,7 +110,7 @@ pid_t spawn_shell(const char* shell, StringView cmdline,
envptrs.push_back(nullptr);
auto cmdlinezstr = cmdline.zstr();
Vector<const char*> execparams = { shell, "-c", cmdlinezstr };
Vector<const char*> execparams = { "sh", "-c", cmdlinezstr };
if (not params.empty())
execparams.push_back(shell);
for (auto& param : params)