def ExecExternalProgram(argv, environ):
"""Execute a program and exit this process.
Called by:
ls /
exec ls /
( ls / )
"""
# TODO: If there is an error, like the file isn't executable, then we should
# exit, and the parent will reap it. Should it capture stderr?
try:
os_.execvpe(argv[0], argv, environ)
except OSError as e:
util.error('%r: %s', argv[0], posix.strerror(e.errno))
# POSIX mentions 126 and 127 for two specific errors. The rest are
# unspecified.
#
# http://pubs.opengroup.org/onlinepubs/9699919799.2016edition/utilities/V3_chap02.html#tag_18_08_02
if e.errno == errno.EACCES:
status = 126
elif e.errno == errno.ENOENT:
status = 127 # e.g. command not found should be 127.
else:
# dash uses 2, but we use that for parse errors. This seems to be
# consistent with mksh and zsh.
status = 127
sys.exit(status)
def Exec(self, arg_vec, environ):
"""Execute a program and exit this process.
Called by:
ls /
exec ls /
( ls / )
"""
argv = arg_vec.strs
if self.hijack_shebang:
try:
f = self.fd_state.Open(argv[0])
except OSError as e:
pass
else:
try:
line = f.read(40)
if _ShouldHijack(line):
self.debug_f.log('Hijacked: %s with %s', argv,
self.hijack_shebang)
argv = [self.hijack_shebang] + argv
else:
#self.debug_f.log('Not hijacking %s (%r)', argv, line)
pass
finally:
f.close()
# TODO: If there is an error, like the file isn't executable, then we should
# exit, and the parent will reap it. Should it capture stderr?
try:
os_.execvpe(argv[0], argv, environ)
except OSError as e:
# TODO: Run with /bin/sh when ENOEXEC error (noshebang). Because all
# shells do it.
# Would be nice: when the path is relative and ENOENT: print PWD and do
# spelling correction?
self.errfmt.Print("Can't execute %r: %s",
argv[0],
posix.strerror(e.errno),
span_id=arg_vec.spids[0])
# POSIX mentions 126 and 127 for two specific errors. The rest are
# unspecified.
#
# http://pubs.opengroup.org/onlinepubs/9699919799.2016edition/utilities/V3_chap02.html#tag_18_08_02
if e.errno == errno.EACCES:
status = 126
elif e.errno == errno.ENOENT:
status = 127 # e.g. command not found should be 127.
else:
# dash uses 2, but we use that for parse errors. This seems to be
# consistent with mksh and zsh.
status = 127
sys.exit(status) # raises SystemExit