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From 6a553f24439fe64fd3a2f0b5902f00590ca4241f Mon Sep 17 00:00:00 2001
From: Philip McGrath <philip@philipmcgrath.com>
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
<paths.h> 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 <sys/wait.h>
# include <errno.h>
# include <unistd.h>
+# include <paths.h> /* PATCHED for Guix */
# ifdef USE_ULIMIT
# include <ulimit.h>
# 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
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