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Blame src/logic/slbt_exec_execute.c

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/*******************************************************************/
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/*  slibtool: a skinny libtool implementation, written in C        */
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/*  Copyright (C) 2016--2018  Z. Gilboa                            */
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/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
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/*******************************************************************/
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#include <string.h>
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#include <stdbool.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <slibtool/slibtool.h>
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#include "slibtool_spawn_impl.h"
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#include "slibtool_driver_impl.h"
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#include "slibtool_errinfo_impl.h"
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int  slbt_exec_execute(
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	const struct slbt_driver_ctx *	dctx,
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	struct slbt_exec_ctx *		ectx)
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{
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	int			ret;
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	int			fdcwd;
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	char *			program;
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	char *			script;
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	char *			base;
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	char *			mark;
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	char			exeref [PATH_MAX];
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	char			wrapper[PATH_MAX];
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	struct stat		st;
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	struct slbt_exec_ctx *	actx = 0;
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	/* dry run */
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	if (dctx->cctx->drvflags & SLBT_DRIVER_DRY_RUN)
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		return 0;
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	/* context */
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	if (ectx)
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		slbt_disable_placeholders(ectx);
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	else if ((ret = slbt_get_exec_ctx(dctx,&ectx)))
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		return ret;
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	else {
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		actx = ectx;
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		slbt_disable_placeholders(ectx);
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	}
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	/* script, program */
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	program = ectx->cargv[0];
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	script  = ectx->cargv[1];
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	if (script) {
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		/* wrapper */
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		if ((size_t)snprintf(wrapper,sizeof(wrapper),"%s%s.exe.wrapper",
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					(script[0] == '/') ? "" : "./",
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					script)
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				>= sizeof(wrapper)) {
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			slbt_free_exec_ctx(actx);
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			return SLBT_BUFFER_ERROR(dctx);
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		}
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		/* exeref */
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		if ((base = strrchr(script,'/')))
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			base++;
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		else
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			base = script;
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		strcpy(exeref,script);
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		mark = exeref + (base - script);
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		sprintf(mark,".libs/%s",base);
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		/* fdcwd */
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		fdcwd = slbt_driver_fdcwd(dctx);
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		/* swap vector */
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		if (!fstatat(fdcwd,script,&st,0) && !fstatat(fdcwd,wrapper,&st,0)) {
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			ectx->cargv[0] = wrapper;
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			ectx->cargv[1] = program;
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			ectx->cargv[2] = exeref;
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		} else {
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			script = program;
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		}
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		/* execute mode */
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		ectx->program = script;
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		ectx->argv    = ectx->cargv;
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	} else {
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		ectx->program = program;
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		ectx->argv    = ectx->cargv;
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	}
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	/* step output */
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	if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT))
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		if (slbt_output_execute(dctx,ectx)) {
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			slbt_free_exec_ctx(actx);
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			return SLBT_NESTED_ERROR(dctx);
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		}
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	execvp(ectx->cargv[0],ectx->argv);
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	slbt_free_exec_ctx(actx);
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	return SLBT_SYSTEM_ERROR(dctx,0);
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}