On Mon, Jun 19, 2017 at 10:08:30AM -0400, Chet Ramey wrote:
[...]
> I can't reproduce this. I suspect one of your startup files is somehow
> being read and setting PATH. It may also be an interaction with the
> command-not-found hook.
Hm, I can still reproduce it under Debian 9, using the `devel' branch, and I'm
sure no startup files are being sourced.
dualbus@debian:~/src/gnu/bash-builds/devel$ ./bash --norc --noprofile
bash-4.4$ declare -p command-not-found
bash: declare: command-not-found: not found
bash-4.4$
GNU bash, version 4.4.12(3)-maint (x86_64-unknown-linux-gnu)
bash-4.4$ PATH= read -e
bash: vim: No such file or directory
echo this is vim
this is vim
I then patched bash like this:
dualbus@debian:~/src/gnu/bash$ git diff -- execute_cmd.c
diff --git a/execute_cmd.c b/execute_cmd.c
index 0183a105..50f4e2f0 100644
--- a/execute_cmd.c
+++ b/execute_cmd.c
@@ -5550,6 +5550,7 @@ shell_execve (command, args, env)
char sample[HASH_BANG_BUFSIZ];
int sample_len;
+ if (strlen(get_string_value ("PATH")) > 0) abort();
SETOSTYPE (0); /* Some systems use for USG/POSIX semantics */
execve (command, args, env);
i = errno; /* error from execve() */
And I got (the first `\C-x \C-e' gets to shell_execve, but PATH is empty):
dualbus@debian:~/src/gnu/bash-builds/devel$ ./bash --norc --noprofile
bash-4.4$ ulimit -c unlimited
bash-4.4$
GNU bash, version 4.4.12(9)-maint (x86_64-unknown-linux-gnu)
bash-4.4$ PATH= read -e
bash: vim: No such file or directory
Aborted (core dumped)
Core was generated by `./bash --norc --noprofile'.
Program terminated with signal SIGABRT, Aborted.
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1 0x00007f30b14c93fa in __GI_abort () at abort.c:89
#2 0x000055a0df6527c4 in shell_execve (command=0x55a0e0a21020
"/usr/bin/vim", args=0x55a0e0a64610, env=0x55a0e0a207f0) at
../../bash/execute_cmd.c:5553
#3 0x000055a0df6525b1 in execute_disk_command (words=0x55a0e0a63c20,
redirects=0x0, command_line=0x55a0e0a20f60 "vim /tmp/bash-fc.HTeaRz",
pipe_in=-1, pipe_out=-1, async=0,
fds_to_close=0x55a0e0a42d80, cmdflags=0) at ../../bash/execute_cmd.c:5348
#4 0x000055a0df650d4f in execute_simple_command
(simple_command=0x55a0e0a62780, pipe_in=-1, pipe_out=-1, async=0,
fds_to_close=0x55a0e0a42d80) at ../../bash/execute_cmd.c:4466
#5 0x000055a0df64a465 in execute_command_internal (command=0x55a0e0a20e80,
asynchronous=0, pipe_in=-1, pipe_out=-1, fds_to_close=0x55a0e0a42d80) at
../../bash/execute_cmd.c:811
#6 0x000055a0df6ad6a8 in parse_and_execute (string=0x55a0e0a61b10 "vim
/tmp/bash-fc.HTeaRz", from_file=0x55a0df71cecd "fc", flags=4) at
../../../bash/builtins/evalstring.c:430
#7 0x000055a0df6aee93 in fc_builtin (list=0x0) at
../../../bash/builtins/../../../bash/builtins/fc.def:438
#8 0x000055a0df6511cb in execute_builtin (builtin=0x55a0df6ae4ae
<fc_builtin>, words=0x55a0e0a625d0, flags=0, subshell=0) at
../../bash/execute_cmd.c:4609
#9 0x000055a0df6520a7 in execute_builtin_or_function (words=0x55a0e0a625d0,
builtin=0x55a0df6ae4ae <fc_builtin>, var=0x0, redirects=0x0,
fds_to_close=0x55a0e0a63df0, flags=0)
at ../../bash/execute_cmd.c:5107
#10 0x000055a0df650ad1 in execute_simple_command
(simple_command=0x55a0e0a62540, pipe_in=-1, pipe_out=-1, async=0,
fds_to_close=0x55a0e0a63df0) at ../../bash/execute_cmd.c:4395
#11 0x000055a0df64a465 in execute_command_internal (command=0x55a0e0a20400,
asynchronous=0, pipe_in=-1, pipe_out=-1, fds_to_close=0x55a0e0a63df0) at
../../bash/execute_cmd.c:811
#12 0x000055a0df6ad6a8 in parse_and_execute (string=0x55a0e0a613b0 "fc -e
\"${VISUAL:-${EDITOR:-emacs}}\"", from_file=0x55a0df70ccd5 "C-xC-e", flags=4)
at ../../../bash/builtins/evalstring.c:430
#13 0x000055a0df696203 in edit_and_execute_command (count=1, c=5,
editing_mode=1, edit_command=0x55a0df70cd10 "fc -e
\"${VISUAL:-${EDITOR:-emacs}}\"") at ../../bash/bashline.c:977
#14 0x000055a0df6962f0 in emacs_edit_and_execute_command (count=1, c=5) at
../../bash/bashline.c:1013
#15 0x000055a0df6dccd5 in _rl_dispatch_subseq (key=5, map=0x55a0df9461a0
<emacs_ctlx_keymap>, got_subseq=0) at
../../../../bash/lib/readline/readline.c:851
#16 0x000055a0df6dd19a in _rl_dispatch_subseq (key=24, map=0x55a0df944160
<emacs_standard_keymap>, got_subseq=0) at
../../../../bash/lib/readline/readline.c:985
#17 0x000055a0df6dca4c in _rl_dispatch (key=-1320386609, map=0x55a0df944160
<emacs_standard_keymap>) at ../../../../bash/lib/readline/readline.c:797
#18 0x000055a0df6dc6d4 in readline_internal_char () at
../../../../bash/lib/readline/readline.c:629
#19 0x000055a0df6dc72c in readline_internal_charloop () at
../../../../bash/lib/readline/readline.c:656
#20 0x000055a0df6dc750 in readline_internal () at
../../../../bash/lib/readline/readline.c:670
#21 0x000055a0df6dc16d in readline (prompt=0x55a0df71d63c "") at
../../../../bash/lib/readline/readline.c:374
#22 0x000055a0df6b6407 in edit_line (p=0x55a0df71d63c "", itext=0x0) at
../../../bash/builtins/../../../bash/builtins/read.def:1095
#23 0x000055a0df6b5243 in read_builtin (list=0x0) at
../../../bash/builtins/../../../bash/builtins/read.def:559
#24 0x000055a0df6511cb in execute_builtin (builtin=0x55a0df6b44f9
<read_builtin>, words=0x55a0e0a60ed0, flags=0, subshell=0) at
../../bash/execute_cmd.c:4609
#25 0x000055a0df6520a7 in execute_builtin_or_function (words=0x55a0e0a60ed0,
builtin=0x55a0df6b44f9 <read_builtin>, var=0x0, redirects=0x0,
fds_to_close=0x55a0e0a61070, flags=0)
at ../../bash/execute_cmd.c:5107
#26 0x000055a0df650ad1 in execute_simple_command
(simple_command=0x55a0e0a60df0, pipe_in=-1, pipe_out=-1, async=0,
fds_to_close=0x55a0e0a61070) at ../../bash/execute_cmd.c:4395
#27 0x000055a0df64a465 in execute_command_internal (command=0x55a0e0a42ba0,
asynchronous=0, pipe_in=-1, pipe_out=-1, fds_to_close=0x55a0e0a61070) at
../../bash/execute_cmd.c:811
#28 0x000055a0df6499c1 in execute_command (command=0x55a0e0a42ba0) at
../../bash/execute_cmd.c:393
#29 0x000055a0df633a2a in reader_loop () at ../../bash/eval.c:172
#30 0x000055a0df631677 in main (argc=3, argv=0x7fff33cecb28,
env=0x7fff33cecb48) at ../../bash/shell.c:794
(gdb) frame
#2 0x000055a0df6527c4 in shell_execve (command=0x55a0e0a21020
"/usr/bin/vim", args=0x55a0e0a64610, env=0x55a0e0a207f0) at
../../bash/execute_cmd.c:5553
5553 if (strlen(get_string_value ("PATH")) > 0) abort();
(gdb) p env[30]
$15 = 0x55a0e0a21140
"PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games"
(gdb) p env[5]
$16 = 0x55a0e0a61460 "EDITOR=vim"
This works fine though:
dualbus@debian:~/src/gnu/bash-builds/devel$ ./bash --norc --noprofile
bash-4.4$ export PATH=
bash-4.4$ read -e
bash: vim: No such file or directory
bash: vim: No such file or directory
bash: vim: No such file or directory
^C
So it seems that the problem is that the tempenv is reset for the second
execution of the `fc' builtin.
And in the case of getting the extra `;'s in the history, it would seem it adds
one per failed execve:
bash-4.4$ history -c
bash-4.4$ export PATH=
bash-4.4$ read -e
bash: vim: No such file or directory
bash: vim: No such file or directory
bash: vim: No such file or directory
bash: vim: No such file or directory
bash: vim: No such file or directory
bash-4.4$ history
1 export PATH=
2 read -e; ; ; ; ;
3 history
--
Eduardo Bustamante
https://dualbus.me/
