chdir to the target directory, run make there and fchdir back after.

allows Makefiles with ${.CURDIR} constructs to work with crunchgen.
pointed out by Holger Mikolon, input from theo, ok theo millert

diff --git a/usr.sbin/crunchgen/crunchgen.c b/usr.sbin/crunchgen/crunchgen.c
index c86ee92..5e088b9 100644 (file)
--- a/usr.sbin/crunchgen/crunchgen.c
+++ b/usr.sbin/crunchgen/crunchgen.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: crunchgen.c,v 1.19 2017/07/27 15:33:42 espie Exp $         */
+/* $OpenBSD: crunchgen.c,v 1.20 2018/02/06 00:05:24 henning Exp $       */
 
 /*
  * Copyright (c) 1994 University of Maryland
@@ -42,6 +42,8 @@
 #include <ctype.h>
 #include <string.h>
 #include <limits.h>
+#include <fcntl.h>
+#include <libgen.h>
 
 #define CRUNCH_VERSION "1.3"
 
@@ -657,8 +659,8 @@ fillin_program(prog_t * p)
 void 
 fillin_program_objs(prog_t * p, char *path)
 {
-       char           *cp, *obj, tempfname[PATH_MAX];
-       int             fd, rc;
+       char           *cp, *obj, tempfname[PATH_MAX], cwd[PATH_MAX];
+       int             fd, dotfd, rc;
        FILE           *f;
 
        /* discover the objs from the srcdir Makefile */
@@ -678,12 +680,28 @@ fillin_program_objs(prog_t * p, char *path)
        fprintf(f, "crunchgen_objs:\n\t@echo 'OBJS= '${OBJS}\n");
        fclose(f);
 
-       snprintf(line, sizeof(line), "make -f %s crunchgen_objs 2>&1", tempfname);
+       if ((dotfd = open(".", O_RDONLY, 0)) == -1 ||
+           getcwd(cwd, sizeof(cwd)) == NULL) {
+               perror("get cwd");
+               goterror = 1;
+               return;
+       }
+       if (chdir(dirname(path)) == -1) {
+               perror("chdir target dir");
+               goterror = 1;
+               return;
+       }
+       snprintf(line, sizeof(line), "make -f %s/%s crunchgen_objs 2>&1", cwd, tempfname);
        if ((f = popen(line, "r")) == NULL) {
                perror("submake pipe");
                goterror = 1;
                return;
        }
+       if (fchdir(dotfd) == -1) {
+               perror("fchdir back");
+               goterror = 1;
+               return;
+       }
        while (fgets(line, MAXLINELEN, f)) {
                if (strncmp(line, "OBJS= ", 6)) {
                        if (strcmp(line,