libxbps: add fexec.c from NetBSD's pkg_install, with some minor mods.

--HG--
extra : convert_revision : 42a4231615746fdc21c826d7f5c1ccbe5ea7a6e2

include/fexec.h

@@ -0,0 +1,37 @@
+/*-
+ * Copyright (c) 2003 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matthias Scheler.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _XBPS_FEXEC_H_
+#define _XBPS_FEXEC_H_
+
+int	xbps_file_exec(const char *, ...);
+int	xbps_file_exec_skipempty(const char *, ...);
+int	xbps_file_chdir_exec(const char *, const char *, ...);
+
+#endif

include/xbps_api.h

@@ -58,5 +58,6 @@
 #include "plist.h"
 #include "sha256.h"
 #include "queue.h"
+#include "fexec.h"
 
 #endif /* !_XBPS_API_H_ */

lib/Makefile

@@ -9,7 +9,7 @@ LIBXBPS		= libxbps.so
 LIBXBPS_LDFLAGS	= -larchive -lprop -shared -Wl,-soname,$(LIBXBPS).$(MAJOR)
 
 OBJECTS	=	cmpver.o depends.o humanize_number.o install.o plist.o
-OBJECTS	+=	sha256.o util.o repository.o
+OBJECTS	+=	sha256.o util.o repository.o fexec.o
 
 all: $(LIBXBPS)
 .PHONY: all

lib/fexec.c

@@ -0,0 +1,153 @@
+/*-
+ * Copyright (c) 2003 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matthias Scheler.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+static int	vfcexec(const char *, int, const char *, va_list);
+static int	pfcexec(const char *, const char *, const char **);
+
+/*
+ * fork, then change current working directory to path and
+ * execute the command and arguments in the argv array.
+ * wait for the command to finish, then return the exit status.
+ */
+static int
+pfcexec(const char *path, const char *file, const char **argv)
+{
+	pid_t			child;
+	int			status;
+
+	child = vfork();
+	switch (child) {
+	case 0:
+		if ((path != NULL) && (chdir(path) < 0))
+			_exit(127);
+
+		(void)execvp(file, (char ** const)argv);
+		_exit(127);
+		/* NOTREACHED */
+	case -1:
+		return -1;
+	}
+
+	while (waitpid(child, &status, 0) < 0) {
+		if (errno != EINTR)
+			return -1;
+	}
+
+	if (!WIFEXITED(status))
+		return -1;
+
+	return WEXITSTATUS(status);
+}
+
+static int
+vfcexec(const char *path, int skipempty, const char *arg, va_list ap)
+{
+	const char **argv;
+	size_t argv_size, argc;
+	int retval;
+
+	argv_size = 16;
+	if ((argv = malloc(argv_size * sizeof(*argv))) == NULL) {
+		errno = ENOMEM;
+		return -1;
+	}
+
+	argv[0] = arg;
+	argc = 1;
+
+	do {
+		if (argc == argv_size) {
+			argv_size *= 2;
+			argv = realloc(argv, argv_size * sizeof(*argv));
+			if (argv == NULL) {
+				errno = ENOMEM;
+				return -1;
+			}
+		}
+
+		arg = va_arg(ap, const char *);
+		if (skipempty && arg && strlen(arg) == 0)
+		    continue;
+
+		argv[argc++] = arg;
+
+	} while (arg != NULL);
+
+	retval = pfcexec(path, argv[0], argv);
+	free(argv);
+
+	return retval;
+}
+
+int
+xbps_file_exec(const char *arg, ...)
+{
+	va_list	ap;
+	int	result;
+
+	va_start(ap, arg);
+	result = vfcexec(NULL, 0, arg, ap);
+	va_end(ap);
+
+	return result;
+}
+
+int
+xbps_file_exec_skipempty(const char *arg, ...)
+{
+	va_list	ap;
+	int	result;
+
+	va_start(ap, arg);
+	result = vfcexec(NULL, 1, arg, ap);
+	va_end(ap);
+
+	return result;
+}
+
+int
+xbps_file_chdir_exec(const char *path, const char *arg, ...)
+{
+	va_list	ap;
+	int	result;
+
+	va_start(ap, arg);
+	result = vfcexec(path, 0, arg, ap);
+	va_end(ap);
+
+	return result;
+}