From 6a553f24439fe64fd3a2f0b5902f00590ca4241f Mon Sep 17 00:00:00 2001 From: Philip McGrath Date: Thu, 4 Mar 2021 04:11:50 -0500 Subject: [PATCH] rktio: patch rktio_process for "/bin/sh" on Guix Racket provides the functions `system` and `process`, which execute shell commands using `sh` (or `cmd` on Windows). Racket assumes that `sh` can be found at "/bin/sh", which is not necessarily true on Guix. This patch adds a special case for "/bin/sh" to `rktio_process`, the C function that implements the core of `system`, `process`, and related Racket functions. If: 1. The nonstandard but ubiquitous macro `_PATH_BSHELL` from is defined; and 2. `rktio_process` is called with the exact path "/bin/sh"; and 3. The file specified by `_PATH_BSHELL` exists; then `rktio_process` will execute the file specified by `_PATH_BSHELL` instead of "/bin/sh". Checking that the path specified by `_PATH_BSHELL` exists safeguards against obscure errors if attempting to use stand-alone executables built by the patched Racket in non-Guix envoronments. --- racket/src/rktio/rktio_process.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/racket/src/rktio/rktio_process.c b/racket/src/rktio/rktio_process.c index fafaf728c1..796ebc59ce 100644 --- a/racket/src/rktio/rktio_process.c +++ b/racket/src/rktio/rktio_process.c @@ -9,6 +9,7 @@ # include # include # include +# include /* PATCHED for Guix */ # ifdef USE_ULIMIT # include # endif @@ -1301,12 +1302,14 @@ int rktio_process_allowed_flags(rktio_t *rktio) /*========================================================================*/ rktio_process_result_t *rktio_process(rktio_t *rktio, - const char *command, int argc, rktio_const_string_t *argv, + /* PATCHED for Guix (next line) */ + const char *_guix_orig_command, int argc, rktio_const_string_t *argv, rktio_fd_t *stdout_fd, rktio_fd_t *stdin_fd, rktio_fd_t *stderr_fd, rktio_process_t *group_proc, const char *current_directory, rktio_envvars_t *envvars, int flags) { + const char *command; /* PATCHED for Guix */ rktio_process_result_t *result; intptr_t to_subprocess[2], from_subprocess[2], err_subprocess[2]; int pid; @@ -1333,6 +1336,18 @@ rktio_process_result_t *rktio_process(rktio_t *rktio, int i; #endif +/* BEGIN PATCH for Guix */ +#if defined(_PATH_BSHELL) + command = + ((0 == strcmp(_guix_orig_command, "/bin/sh")) + && rktio_file_exists(rktio, _PATH_BSHELL)) + ? _PATH_BSHELL + : _guix_orig_command; +#else + command = _guix_orig_command; +#endif +/* END PATCH for Guix */ + /* avoid compiler warnings: */ to_subprocess[0] = -1; to_subprocess[1] = -1; base-commit: 9d228d16fb99c274c964e5bef93e97333888769f -- 2.32.0