gnu: racket: Adjust patch for "/bin/sh" in rktio.

Use '_PATH_BSHELL' instead of a custom preprocessor macro. This may not
be The Right Thing in the long term, but it at least avoids a
proliferation of 'CPPFLAGS'.

* gnu/packages/patches/racket-minimal-sh-via-rktio.patch: Rename to ...
* gnu/packages/patches/racket-rktio-bin-sh.patch: ... this, and change
to use '_PATH_BSHELL'.
* gnu/local.mk (dist_patch_DATA): Update accordingly.
* gnu/packages/racket.scm (%racket-origin)[patches]: Likewise.
(racket-vm-common-configure-flags): Stop setting 'CPPFLAGS'. Change to a
constant instead of a function, since we no longer need the delay.
(racket-vm-cgc, racket-vm-bc,
racket-vm-cs)[arguments]<#:configure-flags>: Update accordingly.
[inputs]: Remove 'bash-minimal'.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

1 files changed, 29 insertions, 31 deletions

diff --git a/gnu/packages/patches/racket-minimal-sh-via-rktio.patch b/gnu/packages/patches/racket-rktio-bin-sh.patch
index 6bc2ee8331..ec6f0d9c56 100644
--- a/gnu/packages/patches/racket-minimal-sh-via-rktio.patch
+++ b/gnu/packages/patches/racket-rktio-bin-sh.patch
@@ -1,7 +1,7 @@
-From 3574b567c486d264d680a37586436c3b5a8cb978 Mon Sep 17 00:00:00 2001
+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] patch rktio_process for "/bin/sh" on Guix
+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).
@@ -12,37 +12,38 @@ 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.
 
-Guix should enable the special case by defining the C preprocessor
-macro `GUIX_RKTIO_PATCH_BIN_SH` with the path to `sh` in the store.
 If:
 
-    1. The `GUIX_RKTIO_PATCH_BIN_SH` macro is defined; and
+    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 path specified by `GUIX_RKTIO_PATCH_BIN_SH` does exists;
+    3. The file specified by `_PATH_BSHELL` exists;
 
-then `rktio_process` will execute the file specified
-by `GUIX_RKTIO_PATCH_BIN_SH` instead of "/bin/sh".
+then `rktio_process` will execute the file specified by `_PATH_BSHELL`
+instead of "/bin/sh".
 
-Compared to previous attempts to patch the Racket sources,
-making this change at the C level is both:
-
-    - More comprehensive: it catches all attempts to execute "/bin/sh",
-      without having to track down the source of every occurance; and
-
-    - Less intrusive: by guarding the special case with a C preprocessor
-      conditional and a runtime check that the file in the store exists,
-      we make it much less likely that it will "leak" out of Guix.
+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 | 21 ++++++++++++++++++++-
- 1 file changed, 20 insertions(+), 1 deletion(-)
+ 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 89202436c0..465ebdd5c5 100644
+index fafaf728c1..796ebc59ce 100644
 --- a/racket/src/rktio/rktio_process.c
 +++ b/racket/src/rktio/rktio_process.c
-@@ -1224,12 +1224,14 @@ int rktio_process_allowed_flags(rktio_t *rktio)
+@@ -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,
@@ -58,22 +59,17 @@ index 89202436c0..465ebdd5c5 100644
    rktio_process_result_t *result;
    intptr_t to_subprocess[2], from_subprocess[2], err_subprocess[2];
    int pid;
-@@ -1255,6 +1257,23 @@ rktio_process_result_t *rktio_process(rktio_t *rktio,
+@@ -1333,6 +1336,18 @@ rktio_process_result_t *rktio_process(rktio_t *rktio,
    int i;
  #endif
  
 +/* BEGIN PATCH for Guix */
-+#if defined(GUIX_RKTIO_PATCH_BIN_SH)
-+# define GUIX_AS_a_STR_HELPER(x) #x
-+# define GUIX_AS_a_STR(x) GUIX_AS_a_STR_HELPER(x)
-+  /* A level of indirection makes `#` work as needed: */
++#if defined(_PATH_BSHELL)
 +  command =
 +      ((0 == strcmp(_guix_orig_command, "/bin/sh"))
-+       && rktio_file_exists(rktio, GUIX_AS_a_STR(GUIX_RKTIO_PATCH_BIN_SH)))
-+      ? GUIX_AS_a_STR(GUIX_RKTIO_PATCH_BIN_SH)
++       && rktio_file_exists(rktio, _PATH_BSHELL))
++      ? _PATH_BSHELL
 +      : _guix_orig_command;
-+# undef GUIX_AS_a_STR
-+# undef GUIX_AS_a_STR_HELPER
 +#else
 +  command = _guix_orig_command;
 +#endif
@@ -82,6 +78,8 @@ index 89202436c0..465ebdd5c5 100644
    /* avoid compiler warnings: */
    to_subprocess[0] = -1;
    to_subprocess[1] = -1;
+
+base-commit: 9d228d16fb99c274c964e5bef93e97333888769f
 -- 
-2.21.1 (Apple Git-122.3)
+2.32.0