Mercurial > hg > toybox
view main.c @ 1470:4f25d3a3eda9 draft
Create a generated/build.sh with a single compiler command line to rebuild the toybox_unstripped binary using the existing generated/*.h files.
This way we can snapshot the generated/*.{h,sh} from a defconfig build into
a "shipped" directory or something, and then people can maybe build on crazy
crippled environments like pcbsd that haven't got gmake and put bash under
/usr/local so none of the #!/scripts can find it. This solves at least
part of the "toybox can build with itself but you need to build toybox first
to have the tools to run the build scripts" problem.
Next up: work out the minimal config to provide the build tools needed
to run an actual build. (This should, eventually, include a "make" command
if freebsd's kernel is going to refuse to build with netbsd's "make" and
we don't just write off the whole thing as crazy. But it probably shouldn't
include commands that #include <linux/*.h> if we are trying to make that work.)
author | Rob Landley <rob@landley.net> |
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date | Thu, 11 Sep 2014 20:50:10 -0500 |
parents | d1411369baa7 |
children | 74b29c369420 |
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/* Toybox infrastructure. * * Copyright 2006 Rob Landley <rob@landley.net> */ #include "toys.h" // Populate toy_list[]. #undef NEWTOY #undef OLDTOY #define NEWTOY(name, opts, flags) {#name, name##_main, opts, flags}, #define OLDTOY(name, oldname, opts, flags) {#name, oldname##_main, opts, flags}, struct toy_list toy_list[] = { #include "generated/newtoys.h" }; // global context for this command. struct toy_context toys; union global_union this; char toybuf[4096], libbuf[4096]; struct toy_list *toy_find(char *name) { int top, bottom, middle; // If the name starts with "toybox" accept that as a match. Otherwise // skip the first entry, which is out of order. if (!strncmp(name,"toybox",6)) return toy_list; bottom = 1; // Binary search to find this command. top = ARRAY_LEN(toy_list)-1; for (;;) { int result; middle = (top+bottom)/2; if (middle<bottom || middle>top) return NULL; result = strcmp(name,toy_list[middle].name); if (!result) return toy_list+middle; if (result<0) top=--middle; else bottom = ++middle; } } // Figure out whether or not anything is using the option parsing logic, // because the compiler can't figure out whether or not to optimize it away // on its' own. NEED_OPTIONS becomes a constant allowing if() to optimize // stuff out via dead code elimination. #undef NEWTOY #undef OLDTOY #define NEWTOY(name, opts, flags) opts || #define OLDTOY(name, oldname, opts, flags) opts || static const int NEED_OPTIONS = #include "generated/newtoys.h" 0; // Ends the opts || opts || opts... // Subset of init needed by singlemain static void toy_singleinit(struct toy_list *which, char *argv[]) { toys.which = which; toys.argv = argv; if (CFG_TOYBOX_I18N && (which->flags & TOYFLAG_LOCALE)) setlocale(LC_ALL, ""); if (CFG_TOYBOX_HELP_DASHDASH && argv[1] && !strcmp(argv[1], "--help")) { if (toys.which == toy_list && toys.argv[2]) if (!(toys.which = toy_find(toys.argv[2]))) return; show_help(); xexit(); } if (NEED_OPTIONS && which->options) get_optflags(); else { toys.optargs = argv+1; for (toys.optc=0; toys.optargs[toys.optc]; toys.optc++); } toys.old_umask = umask(0); if (!(which->flags & TOYFLAG_UMASK)) umask(toys.old_umask); toys.signalfd--; toys.toycount = ARRAY_LEN(toy_list); } // Setup toybox global state for this command. void toy_init(struct toy_list *which, char *argv[]) { // Drop permissions for non-suid commands. if (CFG_TOYBOX_SUID) { uid_t uid = getuid(), euid = geteuid(); if (!(which->flags & TOYFLAG_STAYROOT)) { if (uid != euid) { if (!setuid(uid)) perror_exit("setuid %d->%d", euid, uid); // drop root else euid = uid; } } else if (CFG_TOYBOX_DEBUG && uid && which != toy_list) error_msg("Not installed suid root"); if ((which->flags & TOYFLAG_NEEDROOT) && euid) { toys.exithelp++; error_exit("Not root"); } } // Free old toys contents (to be reentrant), but leave rebound if any if (toys.optargs != toys.argv+1) free(toys.optargs); memset(&toys, 0, offsetof(struct toy_context, rebound)); // Subset of init needed by singlemain. toy_singleinit(which, argv); } // Like exec() but runs an internal toybox command instead of another file. // Only returns if it can't run command internally, otherwise exit() when done. void toy_exec(char *argv[]) { struct toy_list *which; // Return if we can't find it, or need to re-exec to acquire root, // or if stack depth is getting silly. if (!(which = toy_find(argv[0]))) return; if (toys.recursion && (which->flags & TOYFLAG_ROOTONLY) && getuid()) return; if (toys.recursion++ > 5) return; // Run command toy_init(which, argv); if (toys.which) toys.which->toy_main(); if (fflush(NULL) || ferror(stdout)) perror_exit("write"); xexit(); } // Multiplexer command, first argument is command to run, rest are args to that. // If first argument starts with - output list of command install paths. void toybox_main(void) { static char *toy_paths[]={"usr/","bin/","sbin/",0}; int i, len = 0; toys.which = toy_list; if (toys.argv[1]) { toys.optc = 0; toy_exec(toys.argv+1); if (toys.argv[1][0] == '-') goto list; error_exit("Unknown command %s",toys.argv[1]); } list: // Output list of command. for (i=1; i<ARRAY_LEN(toy_list); i++) { int fl = toy_list[i].flags; if (fl & TOYMASK_LOCATION) { if (toys.argv[1]) { int j; for (j=0; toy_paths[j]; j++) if (fl & (1<<j)) len += printf("%s", toy_paths[j]); } len += printf("%s ",toy_list[i].name); if (len>65) { xputc('\n'); len=0; } } } xputc('\n'); } int main(int argc, char *argv[]) { if (CFG_TOYBOX) { // Trim path off of command name *argv = basename(*argv); // Call the multiplexer, adjusting this argv[] to be its' argv[1]. // (It will adjust it back before calling toy_exec().) toys.argv = argv-1; toybox_main(); } else { // a single toybox command built standalone with no multiplexer toy_singleinit(toy_list, argv); toy_list->toy_main(); if (fflush(NULL) || ferror(stdout)) perror_exit("write"); } return toys.exitval; }