src/lib-fs/fs-sis-common.c

/* 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 *fs, 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(fs, "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 *sis_fs, 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_fs, 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_last_error(hash_file->fs));
            }
        }
        fs_file_deinit(&hash_file);
    }
}