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shell.cc
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shell.cc
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/* shell.cc -- GNU's idea of the POSIX shell specification. */
/* Copyright (C) 1987-2019 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash 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.
Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
*/
/*
Birthdate:
Sunday, January 10th, 1988.
Initial author: Brian Fox
*/
#include "config.h"
#include "shell.hh"
#include "conftypes.hh"
#if !defined(HAVE_GETPW_DECLS)
extern struct passwd *getpwuid ();
#endif /* !HAVE_GETPW_DECLS */
#if defined(NO_MAIN_ENV_ARG)
/* systems without third argument to main() */
int
main (int argc, char **argv)
{
try
{
bash::the_shell = new bash::Shell ();
bash::the_shell->start (argc, argv, bash::environ);
}
catch (const std::exception &e)
{
report_error (_ ("unhandled exception: %s"), e.what ());
exit (2);
}
}
#else /* !NO_MAIN_ENV_ARG */
int
main (int argc, char **argv, char **env)
{
try
{
bash::the_shell = new bash::Shell ();
bash::the_shell->start_shell (argc, argv, env);
}
catch (const std::exception &e)
{
fprintf (stderr, _ ("unhandled exception: %s"), e.what ());
exit (2);
}
}
#endif /* !NO_MAIN_ENV_ARG */
// Start of the bash namespace
namespace bash
{
void
Shell::init_long_args ()
{
long_args.push_back (LongArg ("debug", &debugging));
#if defined(DEBUGGER)
long_args.push_back (LongArg ("debugger", &debugging_mode));
#endif
long_args.push_back (LongArg ("dump-po-strings", &dump_po_strings));
long_args.push_back (LongArg ("dump-strings", &dump_translatable_strings));
long_args.push_back (LongArg ("help", &want_initial_help));
long_args.push_back (LongArg ("init-file", &bashrc_file));
long_args.push_back (LongArg ("login", &make_login_shell));
long_args.push_back (LongArg ("noediting", &no_line_editing));
long_args.push_back (LongArg ("noprofile", &no_profile));
long_args.push_back (LongArg ("norc", &no_rc));
long_args.push_back (LongArg ("posix", &posixly_correct));
long_args.push_back (LongArg ("pretty-print", &pretty_print_mode));
#if defined(WORDEXP_OPTION)
long_args.push_back (LongArg ("protected", &protected_mode));
#endif
long_args.push_back (LongArg ("rcfile", &bashrc_file));
#if defined(RESTRICTED_SHELL)
long_args.push_back (LongArg ("restricted", &restricted));
#endif
long_args.push_back (LongArg ("verbose", &verbose_flag));
long_args.push_back (LongArg ("version", &do_version));
#if defined(WORDEXP_OPTION)
long_args.push_back (LongArg ("wordexp", &wordexp_only));
#endif
}
#ifdef __CYGWIN__
void
Shell::_cygwin32_check_tmp ()
{
struct stat sb;
if (stat ("/tmp", &sb) < 0)
internal_warning (_ ("could not find /tmp, please create!"));
else
{
if (S_ISDIR (sb.st_mode) == 0)
internal_warning (_ ("/tmp must be a valid directory name"));
}
}
#endif /* __CYGWIN__ */
// Initialize the simple shell variables to default values.
SimpleState::SimpleState ()
: shell_tty (-1), shell_pgrp (NO_PID), terminal_pgrp (NO_PID),
original_pgrp (NO_PID), last_made_pid (NO_PID),
last_asynchronous_pid (NO_PID), current_command_number (1),
#if defined(BUFFERED_INPUT)
default_buffered_input (-1),
#endif
rseed (1), rseed32 (1073741823), last_command_subst_pid (NO_PID),
current_command_subst_pid (NO_PID), eof_encountered_limit (10),
word_top (-1), indentation_amount (4), xtrace_fd (-1), xattrfd (-1),
sh_opterr (true), sh_optopt ('?'), array_needs_making (true),
#if defined(JOB_CONTROL)
job_control (true),
#endif
check_window_size (CHECKWINSIZE_DEFAULT), hashing_enabled (1),
#if defined(BANG_HISTORY)
history_expansion (HISTEXPAND_DEFAULT),
#endif
interactive_comments (1),
#if defined(RESTRICTED_SHELL)
save_restricted (-1),
#endif
#if defined(BRACE_EXPANSION)
brace_expansion (1),
#endif
extended_quote (1), promptvars (1),
#ifdef HAVE_DEV_FD
have_devfd (HAVE_DEV_FD),
#endif
#if !defined(READLINE)
no_line_editing (1), /* can't have line editing without readline */
#endif
#if defined(STRICT_POSIX)
posixly_correct (1)
#else
posixly_correct (0)
#endif
{
// XXX - remove this if Linux doesn't need this path
#if defined(PGRP_PIPE)
// initialize the array here for strict C++03 compatibility
pgrp_pipe[0] = -1;
pgrp_pipe[1] = -1;
#endif
// manual init for C++03 compatibility
getopt_errstr[0] = '-';
getopt_errstr[1] = '\0';
getopt_errstr[2] = '\0';
}
Shell::Shell ()
: SimpleState (), bashrc_file (const_cast<char *> (DEFAULT_BASHRC)),
primary_prompt (PPROMPT), secondary_prompt (SPROMPT), source (0),
redir (0), old_winch (SIG_DFL), execignore ("EXECIGNORE"),
fignore ("FIGNORE"), globignore ("GLOBIGNORE"), histignore ("HISTIGNORE")
{
// alloc this 4K read buffer from the heap to keep the class size small
zread_lbuf = new char[ZBUFSIZ];
init_long_args ();
posix_vars[0] = &interactive_comments;
posix_vars[1] = &source_uses_path;
posix_vars[2] = &expand_aliases;
posix_vars[3] = &inherit_errexit;
posix_vars[4] = &print_shift_error;
init_token_lists ();
}
// Virtual destructor for Shell.
Shell::~Shell () noexcept { delete[] zread_lbuf; }
// Everything happens when we call this method.
// Renamed from "start" to avoid accidentally appearing to be
// a local variable named "start".
void
Shell::start_shell (int argc, char **argv, char **env)
{
early_init ();
for (;;)
{
try
{
run_shell (argc, argv, env);
}
catch (const subshell_child_start &)
{
argc = subshell_argc;
argv = subshell_argv;
env = subshell_envp;
sourced_env = false;
}
}
}
void
Shell::early_init ()
{
xtrace_init ();
#ifdef __CYGWIN__
_cygwin32_check_tmp ();
#endif /* __CYGWIN__ */
/* Wait forever if we are debugging a login shell. */
while (debugging_login_shell)
sleep (3);
set_default_locale ();
running_setuid = uidget ();
if (getenv ("POSIXLY_CORRECT") || getenv ("POSIX_PEDANTIC"))
posixly_correct = true;
}
void
Shell::run_shell (int argc, char **argv, char **env)
{
#if defined(RESTRICTED_SHELL)
int saverst;
#endif
bool locally_skip_execution;
shell_reinitialized = false;
/* Initialize `local' variables for all `invocations' of main (). */
int arg_index = 1;
if (arg_index > argc)
arg_index = argc;
command_execution_string = nullptr;
shell_script_filename = nullptr;
want_pending_command = locally_skip_execution = read_from_stdin = false;
default_input = stdin;
#if defined(BUFFERED_INPUT)
default_buffered_input = -1;
#endif
/* Fix for the `infinite process creation' bug when running shell scripts
from startup files on System V. */
login_shell = make_login_shell = 0;
/* If this shell has already been run, then reinitialize it to a
vanilla state. */
if (shell_initialized || shell_name)
{
/* Make sure that we do not infinitely recurse as a login shell. */
if (*shell_name == '-')
shell_name++;
shell_reinitialize ();
}
shell_environment = env;
set_shell_name (argv[0]);
gettimeofday (&shellstart, nullptr);
shell_start_time = shellstart.tv_sec;
/* Parse argument flags from the input line. */
/* Find full word arguments first. */
arg_index = parse_long_options (argv, arg_index, argc);
if (want_initial_help)
{
show_shell_usage (stdout, true);
exit (EXECUTION_SUCCESS);
}
if (do_version)
{
show_shell_version (1);
exit (EXECUTION_SUCCESS);
}
echo_input_at_read = verbose_flag; /* --verbose given */
/* All done with full word options; do standard shell option parsing.*/
this_command_name = shell_name; /* for error reporting */
arg_index = parse_shell_options (argv, arg_index, argc);
/* If user supplied the "--login" (or -l) flag, then set and invert
LOGIN_SHELL. */
if (make_login_shell)
{
login_shell++;
login_shell = -login_shell;
}
set_login_shell ("login_shell", login_shell != 0);
if (dump_po_strings)
dump_translatable_strings = true;
if (dump_translatable_strings)
read_but_dont_execute = 1;
if (running_setuid && privileged_mode == 0)
disable_priv_mode ();
/* Need to get the argument to a -c option processed in the
above loop. The next arg is a command to execute, and the
following args are $0...$n respectively. */
if (want_pending_command)
{
command_execution_string = argv[arg_index];
if (command_execution_string == nullptr)
{
report_error (_ ("%s: option requires an argument"), "-c");
exit (EX_BADUSAGE);
}
arg_index++;
}
this_command_name.clear ();
/* First, let the outside world know about our interactive status.
A shell is interactive if the `-i' flag was given, or if all of
the following conditions are met:
no -c command
no arguments remaining or the -s flag given
standard input is a terminal
standard error is a terminal
Refer to Posix.2, the description of the `sh' utility. */
if (forced_interactive || // -i flag or
(!command_execution_string && // No -c command and ...
!wordexp_only && // No --wordexp and ...
((arg_index == argc) || // no remaining args or...
read_from_stdin)
&& // -s flag with args, and
isatty (fileno (stdin)) && // Input is a terminal and
isatty (fileno (stderr)))) // error output is a terminal.
init_interactive ();
else
init_noninteractive ();
/* If we're in a strict Posix.2 mode, turn on interactive comments,
alias expansion in non-interactive shells, and other Posix.2 things.
*/
if (posixly_correct)
{
bind_variable ("POSIXLY_CORRECT", "y");
sv_strict_posix ("POSIXLY_CORRECT");
}
/* Now we run the shopt_alist and process the options. */
if (!shopt_alist.empty ())
run_shopt_alist ();
/* From here on in, the shell must be a normal functioning shell.
Variables from the environment are expected to be set, etc. */
shell_initialize ();
set_default_lang ();
set_default_locale_vars ();
/*
* M-x term -> TERM=eterm-color INSIDE_EMACS='251,term:0.96' (eterm)
* M-x shell -> TERM='dumb' INSIDE_EMACS='25.1,comint' (no line editing)
*
* Older versions of Emacs may set EMACS to 't' or to something like
* '22.1 (term:0.96)' instead of (or in addition to) setting
* INSIDE_EMACS. They may set TERM to 'eterm' instead of 'eterm-color'.
* They may have a now-obsolete command that sets neither EMACS nor
* INSIDE_EMACS: M-x terminal -> TERM='emacs-em7955' (line editing)
*/
if (interactive_shell)
{
bool emacs_term, in_emacs;
const string *term = get_string_value ("TERM");
const string *emacs = get_string_value ("EMACS");
const string *inside_emacs = get_string_value ("INSIDE_EMACS");
if (inside_emacs)
{
emacs_term = inside_emacs->find (",term:") != string::npos;
in_emacs = true;
}
else if (emacs)
{
/* Infer whether we are in an older Emacs. */
emacs_term = emacs->find (" (term:") != string::npos;
in_emacs = emacs_term || *emacs == "t";
}
else
in_emacs = emacs_term = false;
/* Not sure any emacs terminal emulator sets TERM=emacs any more */
if (term)
{
no_line_editing |= *term == "emacs";
no_line_editing |= in_emacs && *term == "dumb";
/* running_under_emacs == 2 for `eterm' */
running_under_emacs = in_emacs || term->find ("emacs") == 0;
running_under_emacs += emacs_term && term->find ("eterm") == 0;
}
if (running_under_emacs)
gnu_error_format = 1;
}
int top_level_arg_index = arg_index;
// Note: Infer says this write is a dead store, but the variable is
// used in the catch block, so I think it's necessary to initialize it.
char old_errexit_flag = exit_immediately_on_error;
/* Give this shell a place to catch exceptions before executing the
startup files. This allows users to press C-c to abort the
lengthy startup, which retries with locally_skip_execution set. */
for (;;)
{
try
{
arg_index = top_level_arg_index;
/* Execute the start-up scripts. */
if (!interactive_shell)
{
unbind_variable ("PS1");
unbind_variable ("PS2");
interactive = false;
#if 0
/* This has already been done by init_noninteractive */
expand_aliases = posixly_correct;
#endif
}
else
{
change_flag ('i', FLAG_ON);
interactive = true;
}
#if defined(RESTRICTED_SHELL)
/* Set restricted_shell based on whether the basename of $0 indicates
that the shell should be restricted or if the `-r' option was
supplied at startup. */
restricted_shell = shell_is_restricted (shell_name);
/* If the `-r' option is supplied at invocation, make sure that the
shell is not in restricted mode when running the startup files. */
saverst = restricted;
restricted = 0;
#endif
/* Set positional parameters before running startup files.
top_level_arg_index holds the index of the current argument before
setting the positional parameters, so any changes performed in the
startup files won't affect later option processing. */
if (wordexp_only)
; /* nothing yet */
else if (command_execution_string)
(void)bind_args (argv, arg_index, argc, 0); /* $0 ... $n */
else if (arg_index != argc && read_from_stdin == 0)
{
shell_script_filename = argv[arg_index++];
(void)bind_args (argv, arg_index, argc, 1); /* $1 ... $n */
}
else
(void)bind_args (argv, arg_index, argc, 1); /* $1 ... $n */
/* The startup files are run with `set -e' temporarily disabled. */
if (!locally_skip_execution && !running_setuid)
{
old_errexit_flag = exit_immediately_on_error;
exit_immediately_on_error = 0;
run_startup_files ();
exit_immediately_on_error += old_errexit_flag;
}
/* If we are invoked as `sh', turn on Posix mode. */
if (act_like_sh)
{
bind_variable ("POSIXLY_CORRECT", "y");
sv_strict_posix ("POSIXLY_CORRECT");
}
#if defined(RESTRICTED_SHELL)
/* Turn on the restrictions after executing the startup files. This
means that `bash -r' or `set -r' invoked from a startup file will
turn on the restrictions after the startup files are executed. */
restricted = saverst || restricted;
if (!shell_reinitialized)
maybe_make_restricted (shell_name);
#endif /* RESTRICTED_SHELL */
#if defined(WORDEXP_OPTION)
if (wordexp_only)
{
startup_state = 3;
last_command_exit_value
= run_wordexp (argv[top_level_arg_index]);
exit_shell (last_command_exit_value);
}
#endif
if (command_execution_string)
{
startup_state = 2;
if (debugging_mode)
start_debugger ();
#if defined(ONESHOT)
executing = true;
run_one_command (command_execution_string);
exit_shell (last_command_exit_value);
#else /* ONESHOT */
with_input_from_string (command_execution_string, "-c");
goto read_and_execute;
#endif /* !ONESHOT */
}
/* Get possible input filename and set up default_buffered_input or
default_input as appropriate. */
if (shell_script_filename)
open_shell_script (shell_script_filename);
else if (!interactive)
{
/* In this mode, bash is reading a script from stdin, which is a
pipe or redirected file. */
#if defined(BUFFERED_INPUT)
default_buffered_input = fileno (stdin); /* == 0 */
#else
setbuf (default_input, nullptr);
#endif /* !BUFFERED_INPUT */
read_from_stdin = true;
}
else if (top_level_arg_index
== argc) /* arg index before startup files */
/* "If there are no operands and the -c option is not specified,
the -s option shall be assumed." */
read_from_stdin = true;
set_bash_input ();
if (debugging_mode && locally_skip_execution == 0
&& running_setuid == 0
&& (reading_shell_script || interactive_shell == 0))
start_debugger ();
/* Do the things that should be done only for interactive shells. */
if (interactive_shell)
{
/* Set up for checking for presence of mail. */
reset_mail_timer ();
init_mail_dates ();
#if defined(HISTORY)
/* Initialize the interactive history stuff. */
bash_initialize_history ();
/* Don't load the history from the history file if we've already
saved some lines in this session (e.g., by putting `history -s
xx' into one of the startup files). */
if (!shell_initialized && history_lines_this_session == 0)
load_history ();
#endif /* HISTORY */
/* Initialize terminal state for interactive shells after the
.bash_profile and .bashrc are interpreted. */
get_tty_state ();
}
#if !defined(ONESHOT)
read_and_execute:
#endif /* !ONESHOT */
shell_initialized = true;
if (pretty_print_mode && interactive_shell)
{
internal_warning (
_ ("pretty-printing mode ignored in interactive shells"));
pretty_print_mode = false;
}
if (pretty_print_mode)
exit_shell (pretty_print_loop ());
/* Read commands until exit condition. */
reader_loop ();
exit_shell (last_command_exit_value);
}
catch (const bash_exception &e)
{
if (e.type == EXITPROG || e.type == ERREXIT)
exit_shell (last_command_exit_value);
else
{
#if defined(JOB_CONTROL)
/* Reset job control, since run_startup_files turned it off. */
set_job_control (interactive_shell);
#endif
/* Reset value of `set -e', since it's turned off before running
the startup files. */
exit_immediately_on_error += old_errexit_flag;
locally_skip_execution = true;
}
}
}
}
int
Shell::parse_long_options (char **argv, int arg_start, int arg_end)
{
int arg_index, longarg;
char *arg_string;
arg_index = arg_start;
while ((arg_index != arg_end) && (arg_string = argv[arg_index])
&& (*arg_string == '-'))
{
longarg = 0;
/* Make --login equivalent to -login. */
if (arg_string[1] == '-' && arg_string[2])
{
longarg = 1;
arg_string++;
}
vector<LongArg>::const_iterator it;
string_view this_arg (arg_string + 1); // skip '-'
bool found = false;
for (it = long_args.begin (); it != long_args.end (); ++it)
{
if (this_arg == (*it).name)
{
if ((*it).type == Bool)
*(*it).value.bool_ptr = true;
else if ((*it).type == Flag)
*(*it).value.flag_ptr = 1;
else if (argv[++arg_index] == nullptr)
{
string name_cstr (to_string ((*it).name));
report_error (_ ("%s: option requires an argument"),
name_cstr.c_str ());
exit (EX_BADUSAGE);
}
else
*(*it).value.char_ptr = argv[arg_index];
found = true;
break;
}
}
if (!found)
{
if (longarg)
{
report_error (_ ("%s: invalid option"), argv[arg_index]);
show_shell_usage (stderr, false);
exit (EX_BADUSAGE);
}
break; /* No such argument. Maybe flag arg. */
}
arg_index++;
}
return arg_index;
}
int
Shell::parse_shell_options (char **argv, int arg_start, int arg_end)
{
char *arg_string;
int arg_index = arg_start;
while (arg_index != arg_end && (arg_string = argv[arg_index])
&& (*arg_string == '-' || *arg_string == '+'))
{
/* There are flag arguments, so parse them. */
int next_arg = arg_index + 1;
/* A single `-' signals the end of options. From the 4.3 BSD sh.
An option `--' means the same thing; this is the standard
getopt(3) meaning. */
if (arg_string[0] == '-'
&& (arg_string[1] == '\0'
|| (arg_string[1] == '-' && arg_string[2] == '\0')))
return next_arg;
int i = 1;
char arg_character;
char *o_option;
char on_or_off = arg_string[0];
while ((arg_character = arg_string[i++]))
{
switch (arg_character)
{
case 'c':
want_pending_command = true;
break;
case 'l':
make_login_shell = true;
break;
case 's':
read_from_stdin = true;
break;
case 'o':
o_option = argv[next_arg];
if (o_option == nullptr)
{
set_option_defaults ();
list_minus_o_opts (-1, (on_or_off == '-') ? 0 : 1);
reset_option_defaults ();
break;
}
if (set_minus_o_option (on_or_off, o_option)
!= EXECUTION_SUCCESS)
exit (EX_BADUSAGE);
next_arg++;
break;
case 'O':
/* Since some of these can be overridden by the normal
interactive/non-interactive shell initialization or
initializing posix mode, we save the options and process
them after initialization. */
o_option = argv[next_arg];
if (o_option == nullptr)
{
shopt_listopt (o_option, (on_or_off == '-') ? 0 : 1);
break;
}
add_shopt_to_alist (o_option, on_or_off);
next_arg++;
break;
case 'D':
dump_translatable_strings = true;
break;
default:
if (change_flag (arg_character, on_or_off) == FLAG_ERROR)
{
report_error (_ ("%c%c: invalid option"), on_or_off,
arg_character);
show_shell_usage (stderr, false);
exit (EX_BADUSAGE);
}
}
}
/* Can't do just a simple increment anymore -- what about
"bash -abouo emacs ignoreeof -hP"? */
arg_index = next_arg;
}
return arg_index;
}
/* Exit the shell with status S. */
void
Shell::exit_shell (int s)
{
fflush (stdout); /* XXX */
fflush (stderr);
/* Clean up the terminal if we are in a state where it's been modified. */
#if defined(READLINE)
if (RL_ISSTATE (RL_STATE_TERMPREPPED) && rl_deprep_term_function)
(*(dynamic_cast<Readline *> (this)).*rl_deprep_term_function) ();
#endif
if (read_tty_modified ())
read_tty_cleanup ();
/* Do trap[0] if defined. Allow it to override the exit status
passed to us. */
if (signal_is_trapped (0))
s = run_exit_trap ();
#if defined(PROCESS_SUBSTITUTION)
unlink_all_fifos ();
#endif /* PROCESS_SUBSTITUTION */
#if defined(HISTORY)
if (remember_on_history)
maybe_save_shell_history ();
#endif /* HISTORY */
#if defined(COPROCESS_SUPPORT)
coproc_flush ();
#endif
#if defined(JOB_CONTROL)
/* If the user has run `shopt -s huponexit', hangup all jobs when we exit
an interactive login shell. ksh does this unconditionally. */
if (interactive_shell && login_shell && hup_on_exit)
hangup_all_jobs ();
/* If this shell is interactive, or job control is active, terminate all
stopped jobs and restore the original terminal process group. Don't do
this if we're in a subshell and calling exit_shell after, for example,
a failed word expansion. We want to do this even if the shell is not
interactive because we set the terminal's process group when job control
is enabled regardless of the interactive status. */
if (subshell_environment == 0)
end_job_control ();
#endif /* JOB_CONTROL */
/* Always return the exit status of the last command to our parent. */
sh_exit (s);
}
/* Exit a subshell, which includes calling the exit trap. We don't want to
do any more cleanup, since a subshell is created as an exact copy of its
parent. */
void
Shell::subshell_exit (int s)
{
fflush (stdout);
fflush (stderr);
/* Do trap[0] if defined. Allow it to override the exit status
passed to us. */
if (signal_is_trapped (0))
s = run_exit_trap ();
sh_exit (s);
}
/* Source the bash startup files. If POSIXLY_CORRECT is non-zero, we obey
the Posix.2 startup file rules: $ENV is expanded, and if the file it
names exists, that file is sourced. The Posix.2 rules are in effect
for interactive shells only. (section 4.56.5.3) */
/* Execute ~/.bashrc for most shells. Never execute it if
ACT_LIKE_SH is set, or if NO_RC is set.
If the executable file "/usr/gnu/src/bash/foo" contains:
#!/usr/gnu/bin/bash
echo hello
then:
COMMAND EXECUTE BASHRC
--------------------------------
bash -c foo NO
bash foo NO
foo NO
rsh machine ls YES (for rsh, which calls `bash -c')
rsh machine foo YES (for shell started by rsh) NO (for foo!)
echo ls | bash NO
login NO
bash YES
*/
void
Shell::execute_env_file (const char *env_file)
{
if (env_file && *env_file)
{
string fn (expand_string_unsplit_to_string (env_file, Q_DOUBLE_QUOTES));
if (!fn.empty ())
maybe_execute_file (fn.c_str (), true);
}
}
void
Shell::run_startup_files ()
{
#if defined(JOB_CONTROL)
bool old_job_control;
#endif
bool sourced_login, run_by_ssh;
/* get the rshd/sshd case out of the way first. */
if (!interactive_shell && !no_rc && (login_shell == 0) && !act_like_sh
&& command_execution_string)
{
#ifdef SSH_SOURCE_BASHRC
run_by_ssh = (find_variable ("SSH_CLIENT") != (SHELL_VAR *)0)
|| (find_variable ("SSH2_CLIENT") != (SHELL_VAR *)0);
#else
run_by_ssh = false;
#endif
/* If we were run by sshd or we think we were run by rshd, execute
~/.bashrc if we are a top-level shell. */
if ((run_by_ssh || isnetconn (fileno (stdin))) && shell_level < 2)
{
#ifdef SYS_BASHRC
maybe_execute_file (SYS_BASHRC, 1);
#endif
maybe_execute_file (bashrc_file, 1);
return;
}
}
#if defined(JOB_CONTROL)
/* Startup files should be run without job control enabled. */
old_job_control = interactive_shell ? set_job_control (false) : false;
#endif
sourced_login = false;
/* A shell begun with the --login (or -l) flag that is not in posix mode
runs the login shell startup files, no matter whether or not it is
interactive. If NON_INTERACTIVE_LOGIN_SHELLS is defined, run the
startup files if argv[0][0] == '-' as well. */
#if defined(NON_INTERACTIVE_LOGIN_SHELLS)
if (login_shell && !posixly_correct)
#else
if (login_shell < 0 && !posixly_correct)
#endif
{
/* We don't execute .bashrc for login shells. */
no_rc = true;
/* Execute /etc/profile and one of the personal login shell
initialization files. */
if (!no_profile)
{
maybe_execute_file (SYS_PROFILE, true);
if (act_like_sh) /* sh */
maybe_execute_file ("~/.profile", true);
else if ((maybe_execute_file ("~/.bash_profile", true) == 0)
&& (maybe_execute_file ("~/.bash_login", true)
== 0)) /* bash */
maybe_execute_file ("~/.profile", true);
}
sourced_login = true;
}
/* A non-interactive shell not named `sh' and not in posix mode reads and
executes commands from $BASH_ENV. If `su' starts a shell with `-c cmd'
and `-su' as the name of the shell, we want to read the startup files.
No other non-interactive shells read any startup files. */
if (!interactive_shell && !(su_shell && login_shell))
{
if (!posixly_correct && !act_like_sh && !privileged_mode && !sourced_env)
{
sourced_env = true;
const string *bash_env = get_string_value ("BASH_ENV");
if (bash_env)
execute_env_file (bash_env->c_str ());
}
return;
}
/* Interactive shell or `-su' shell. */
if (!posixly_correct) /* bash, sh */
{
if (login_shell && !sourced_login)
{
// sourced_login = true; // not referenced again
/* We don't execute .bashrc for login shells. */
no_rc = true;
/* Execute /etc/profile and one of the personal login shell
initialization files. */
if (!no_profile)
{
maybe_execute_file (SYS_PROFILE, true);
if (act_like_sh) /* sh */
maybe_execute_file ("~/.profile", true);
else if ((maybe_execute_file ("~/.bash_profile", true) == 0)
&& (maybe_execute_file ("~/.bash_login", true)
== 0)) /* bash */
maybe_execute_file ("~/.profile", true);