commit - 30a624fb1ef8d2d9706a604cbf65dcdacf072e72
commit + 4c9b88110ffd0deb6eed9861f320246d8354bae2
blob - 8c49224c3f3618922f155e0671044215eba5d031
blob + f593c2654e3b83e7aaf1b5fa2a6a2f3311675648
--- include/got_opentemp.h
+++ include/got_opentemp.h
@@ -42,3 +42,6 @@ const struct got_error *got_opentemp_named_fd(char **,
 
 /* Truncate a file. This is useful for re-using open temporary files. */
 const struct got_error *got_opentemp_truncate(FILE *);
+
+/* Truncate a file via a file descriptor. */
+const struct got_error *got_opentemp_truncatefd(int);
blob - af76736e74e8d84085430ebf22b10d5375f8d887
blob + a0d0c2213dfee3f56549ae2f92dc2415d3d9744d
--- lib/opentemp.c
+++ lib/opentemp.c
@@ -132,3 +132,13 @@ got_opentemp_truncate(FILE *f)
 		return got_error_from_errno("fseeko");
 	return NULL;
 }
+
+const struct got_error *
+got_opentemp_truncatefd(int fd)
+{
+	if (ftruncate(fd, 0L) == -1)
+		return got_error_from_errno("ftruncate");
+	if (lseek(fd, 0L, SEEK_SET) == -1)
+		return got_error_from_errno("lseek");
+	return NULL;
+}