[bug #57022] Error 127 executing a script with no #!

[Dmitry Goncharov]

Follow-up Comment #4, bug #57022 (project make):

1. gmake posix_spawn's dodgy
2. fork inside posix_spawn succeeds and posix_spawn returns 0.
3. gmake skips fallback to /bin/sh because posix_spawn's return code is not
enoexec.
4. posix_spawn's child proceeds to exec dodgy and fails
5. posix_spawn does not have a fallback to /bin/sh and the child exits with
127.

The reason dodgy succeeds with SHELL=/bin/bash is gmake spawning /bin/bash and
passing as a parameter to /bin/bash via argv.
The reason dodgy fails with SHELL=/bin/sh is gmake treats SHELL=/bin/sh as if
no shell was explicitly specified in the makefile and again spawns dodgy.

Having configure disable posix_spawn was discussed here
https://lists.gnu.org/archive/html/bug-make/2019-09/msg00000.html.

It is possible have gmake always spawn a shell (subject to configure test).
This solution'd cause gmake spawn a shell even when no shell is needed.

Paul, what about replacing --disable-posix-spawn with --enable-posix-spawn?

regards, Dmitry

    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?57022>

_______________________________________________
  Message sent via Savannah
  https://savannah.gnu.org/