From 5398e6d3305def343a009aba7c5f8915851c4115 Mon Sep 17 00:00:00 2001 From: Philip McGrath Date: Wed, 24 Aug 2022 19:55:14 -0400 Subject: [PATCH] Chez Scheme: patch s_process for "/bin/sh" on Guix If: 1. The nonstandard but ubiquitous macro `_PATH_BSHELL` from is defined; and 2. The path specified by `_PATH_BSHELL` exists; then `s_process` will call `execl` with 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 the patched Chez Scheme or executables it builds in non-Guix envoronments. This patch does not change the behavior of `s_system`, which relies on `system` from the C library. --- Notes: See also chez-scheme-bin-sh.patch, racket-rktio-bin-sh.patch, and zuo-bin-sh.patch. racket/src/ChezScheme/c/prim5.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/racket/src/ChezScheme/c/prim5.c b/racket/src/ChezScheme/c/prim5.c index 90b087f125..284f063f8b 100644 --- a/racket/src/ChezScheme/c/prim5.c +++ b/racket/src/ChezScheme/c/prim5.c @@ -27,6 +27,12 @@ #include #endif +/* BEGIN PATCH for Guix */ +#ifndef WIN32 +# include +#endif +/* END PATCH for Guix */ + /* locally defined functions */ static INT s_errno(void); static IBOOL s_addr_in_heap(uptr x); @@ -875,6 +881,17 @@ static ptr s_process(char *s, IBOOL stderrp) { INT tofds[2], fromfds[2], errfds[2]; struct sigaction act, oint_act; + /* BEGIN PATCH for Guix */ +#if defined(_PATH_BSHELL) + struct stat guix_stat_buf; + char *guix_sh = + (0 == stat(_PATH_BSHELL, &guix_stat_buf)) + ? _PATH_BSHELL + : "/bin/sh"; +#else /* _PATH_BSHELL */ + char *guix_sh = "/bin/sh"; +#endif + /* END PATCH for Guix */ if (pipe(tofds)) S_error("process","cannot open pipes"); if (pipe(fromfds)) { @@ -911,7 +928,9 @@ static ptr s_process(char *s, IBOOL stderrp) { } } #endif /* __GNU__ Hurd */ - execl("/bin/sh", "/bin/sh", "-c", s, NULL); + /* BEGIN PATCH for Guix */ + execl(guix_sh, guix_sh, "-c", s, NULL); + /* END PATCH for Guix */ _exit(1) /* only if execl fails */; /*NOTREACHED*/ } else { base-commit: 78fef00d4d16a79fdf6ab31924b3a80cadf4b368 -- 2.41.0