+ contents = run_with_timeout(ctx, cmd, &ok, time_ms);
+ if (ok) {
+ talloc_free(contents);
+ return NULL;
+ }
+
+ if (!contents)
+ err(1, "Problem running child");
+ if (*time_ms == 0)
+ contents = talloc_asprintf_append(contents,
+ "\n== TIMED OUT ==\n");
+ return contents;
+}
+
+static int unlink_all(char *dir)
+{
+ char cmd[strlen(dir) + sizeof("rm -rf ")];
+ sprintf(cmd, "rm -rf %s", dir);
+ if (system(cmd) != 0)
+ warn("Could not remove temporary work in %s", dir);
+ return 0;
+}
+
+char *temp_file(const void *ctx, const char *extension)
+{
+ /* For first call, create dir. */
+ while (!tmpdir) {
+ tmpdir = getenv("TMPDIR");
+ if (!tmpdir)
+ tmpdir = "/tmp";
+ tmpdir = talloc_asprintf(talloc_autofree_context(),
+ "%s/ccanlint-%u.%lu",
+ tmpdir, getpid(), random());
+ if (mkdir(tmpdir, 0700) != 0) {
+ if (errno == EEXIST) {
+ talloc_free(tmpdir);
+ tmpdir = NULL;
+ continue;
+ }
+ err(1, "mkdir %s failed", tmpdir);
+ }
+ talloc_set_destructor(tmpdir, unlink_all);
+ }
+
+ return talloc_asprintf(ctx, "%s/%u%s", tmpdir, count++, extension);
+}
+
+char *maybe_temp_file(const void *ctx, const char *extension, bool keep,
+ const char *srcname)
+{
+ size_t baselen;
+
+ if (!keep)
+ return temp_file(ctx, extension);
+
+ baselen = strrchr(srcname, '.') - srcname;
+ return talloc_asprintf(ctx, "%.*s%s", baselen, srcname, extension);
+}
+
+bool move_file(const char *oldname, const char *newname)
+{
+ char *contents;
+ size_t size;
+ int fd;
+ bool ret;
+
+ /* Simple case: rename works. */
+ if (rename(oldname, newname) == 0)
+ return true;
+
+ /* Try copy and delete: not atomic! */
+ contents = grab_file(NULL, oldname, &size);
+ if (!contents)
+ return false;
+
+ fd = open(newname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
+ if (fd < 0) {
+ ret = false;
+ goto free;
+ }
+
+ ret = write_all(fd, contents, size);
+ if (close(fd) != 0)
+ ret = false;