diff options
Diffstat (limited to 'gnu/packages/patches/racket-sh-via-rktio.patch')
| -rw-r--r-- | gnu/packages/patches/racket-sh-via-rktio.patch | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/gnu/packages/patches/racket-sh-via-rktio.patch b/gnu/packages/patches/racket-sh-via-rktio.patch new file mode 100644 index 0000000000..b4fefd1514 --- /dev/null +++ b/gnu/packages/patches/racket-sh-via-rktio.patch @@ -0,0 +1,87 @@ +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) + |