commit aead84be5857aecb84cf961972e04ab63a84eafb
from: Omar Polo <op@omarpolo.com>
date: Mon Jan 10 11:37:30 2022 UTC

9ps: chdir to script basename before including it

In the *-suite.9ps files we have stuff like `include "lib.9ps"`, but
when ninepscript is called from the *root* directory that include will
fail.

This is a workaround to allow including file relatively and allows to
run the regress suite.

commit - 3656a5b1eb8cc258077306e04015157caca4d17d
commit + aead84be5857aecb84cf961972e04ab63a84eafb
blob - 6e080e055abaead5828c1c95ebd85c1aa530add6
blob + f3bf7eddb1d35506e7f7db3055d8ed8654ec8a6b
--- ninepscript/parse.y
+++ ninepscript/parse.y
@@ -27,13 +27,16 @@
 
 #include <ctype.h>
 #include <errno.h>
+#include <fcntl.h>
 #include <inttypes.h>
+#include <libgen.h>
 #include <limits.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <syslog.h>
+#include <unistd.h>
 
 #include "log.h"
 #include "kami.h"
@@ -667,9 +670,27 @@ popfile(void)
 void
 loadfile(const char *path)
 {
-	int errors;
+	int pwdfd, errors;
+	char p[PATH_MAX], *dir;
 
-	file = pushfile(path);
+	/*
+	 * Ugly workaround: we really need a smarter `include', one that 
+	 * is able to resolve path relatively from the currently processed
+	 * file.  The workaround consist to save the current directory,
+	 * chdir(2) to the script dirname and then jump back by mean of
+	 * fchdir.
+	 */
+
+	if ((pwdfd = open(".", O_RDONLY|O_DIRECTORY)) == -1)
+		err(1, "can't open .");
+	strlcpy(p, path, sizeof(p));
+	dir = dirname(p);
+	if (chdir(dir) == -1)
+		err(1, "chdir %s", dir);
+
+	/* XXX: include the *basename* of the file after chdir */
+	strlcpy(p, path, sizeof(p));
+	file = pushfile(basename(p));
 	if (file == NULL)
 		err(1, "pushfile");
 	topfile = file;
@@ -678,6 +699,9 @@ loadfile(const char *path)
 	errors = file->errors;
 	popfile();
 
+	fchdir(pwdfd);
+	close(pwdfd);
+
 	if (errors)
 		errx(1, "can't load %s because of errors", path);
 }