gnu: racket: Unbundle racket-minimal.

This change takes advantage of improved support for layered
and tethered installations in Racket 8.2.

* gnu/packages/racket.scm (extend-layer): New private variable.
This is a script for configuring a new config-tethered layer
chaining to an existing Racket installation.
* gnu/packages/racket.scm (racket)[source](snippet): Unbundle
`racket-minimal`.
[inputs]: Remove inputs that properly belong to `racket-minimal`.
[native-inputs]: Add `racket-minimal` and `extend-layer`.
[arguments]: Stop inheriting from `racket-minimal`. Add phase
'unpack-packages to move the sources and links file into place.
Replace 'configure phase using `extend-layer`.
Replace 'build phase using `raco setup`.
Delete 'install phase.
* gnu/packages/patches/racket-sh-via-rktio.patch: Rename to ...
* gnu/packages/patches/racket-minimal-sh-via-rktio.patch: ... this
file to placate `guix lint`.
* gnu/local.mk (dist_patch_DATA): Update accordingly.
* gnu/packages/racket.scm (racket-minimal)[source]: Likewise.

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

1 files changed, 0 insertions, 87 deletions

diff --git a/gnu/packages/patches/racket-sh-via-rktio.patch b/gnu/packages/patches/racket-sh-via-rktio.patch
deleted file mode 100644
index b4fefd1514..0000000000
--- a/gnu/packages/patches/racket-sh-via-rktio.patch
+++ /dev/null
@@ -1,87 +0,0 @@
-From 3574b567c486d264d680a37586436c3b5a8cb978 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
-
-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.
-
-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
-
-    2. `rktio_process` is called with the exact path "/bin/sh"; and
-
-    3. The path specified by `GUIX_RKTIO_PATCH_BIN_SH` does exists;
-
-then `rktio_process` will execute the file specified
-by `GUIX_RKTIO_PATCH_BIN_SH` 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.
----
- src/rktio/rktio_process.c | 21 ++++++++++++++++++++-
- 1 file changed, 20 insertions(+), 1 deletion(-)
-
-diff --git a/src/rktio/rktio_process.c b/src/rktio/rktio_process.c
-index 89202436c0..465ebdd5c5 100644
---- a/src/rktio/rktio_process.c
-+++ b/src/rktio/rktio_process.c
-@@ -1224,12 +1224,14 @@ 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;
-@@ -1255,6 +1257,23 @@ 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: */
-+  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)
-+      : _guix_orig_command;
-+# undef GUIX_AS_a_STR
-+# undef GUIX_AS_a_STR_HELPER
-+#else
-+  command = _guix_orig_command;
-+#endif
-+/* END PATCH for Guix */
-+
-   /* avoid compiler warnings: */
-   to_subprocess[0] = -1;
-   to_subprocess[1] = -1;
--- 
-2.21.1 (Apple Git-122.3)
-