1 files changed, 59 insertions, 0 deletions
diff --git a/src/lib-fs/fs-sis-common.c b/src/lib-fs/fs-sis-common.c
new file mode 100644
index 0000000..654c44e
--- /dev/null
+++ b/src/lib-fs/fs-sis-common.c
@@ -0,0 +1,59 @@
+/* Copyright (c) 2010-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "fs-sis-common.h"
+
+#include <sys/stat.h>
+
+int fs_sis_path_parse(struct fs_file *file, const char *path,
+		      const char **dir_r, const char **hash_r)
+{
+	const char *fname, *p;
+
+	fname = strrchr(path, '/');
+	if (fname == NULL) {
+		*dir_r = ".";
+		fname = path;
+	} else {
+		*dir_r = t_strdup_until(path, fname);
+		fname++;
+	}
+
+	/* assume filename begins with "<hash>-" */
+	p = strchr(fname, '-');
+	if (p == NULL) {
+		fs_set_error(file->event, EINVAL, "open(%s) failed: "
+			     "Filenames must begin with '<hash>-'", path);
+		return -1;
+	}
+	*hash_r = t_strdup_until(fname, p);
+	return 0;
+}
+
+void fs_sis_try_unlink_hash_file(struct fs_file *sis_file,
+				 struct fs_file *super_file)
+{
+	struct fs_file *hash_file;
+	struct stat st1, st2;
+	const char *dir, *hash, *hash_path;
+
+	if (fs_sis_path_parse(sis_file, super_file->path, &dir, &hash) == 0 &&
+	    fs_stat(super_file, &st1) == 0 && st1.st_nlink == 2) {
+		/* this may be the last link. if hashes/ file is the same,
+		   delete it. */
+		hash_path = t_strdup_printf("%s/"HASH_DIR_NAME"/%s", dir, hash);
+		hash_file = fs_file_init_with_event(super_file->fs,
+						    super_file->event, hash_path,
+						    FS_OPEN_MODE_READONLY);
+		if (fs_stat(hash_file, &st2) == 0 &&
+		    st1.st_ino == st2.st_ino &&
+		    CMP_DEV_T(st1.st_dev, st2.st_dev)) {
+			if (fs_delete(hash_file) < 0) {
+				e_error(hash_file->event, "%s",
+					fs_file_last_error(hash_file));
+			}
+		}
+		fs_file_deinit(&hash_file);
+	}
+}
+