[U-Boot] [PATCH 2/3] ubifs: Add a ubifsexists command

[Hans de Goede]

Add a ubifsexists command to check whether a file exists on an ubifs volume.

This is useful for use in standardized bootscripts, such as the scripts
from include/config_distro_bootcmd.h.

Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
 common/cmd_ubifs.c | 23 +++++++++++++++++++++++
 fs/ubifs/ubifs.c   | 12 ++++++++++++
 fs/ubifs/ubifs.h   |  1 +
 3 files changed, 36 insertions(+)

diff --git a/common/cmd_ubifs.c b/common/cmd_ubifs.c
index 8e9a4e5..1a54ba0 100644
--- a/common/cmd_ubifs.c
+++ b/common/cmd_ubifs.c
@@ -145,6 +145,22 @@ static int do_ubifs_load(cmd_tbl_t *cmdtp, int flag, int 
argc,
        return ret;
 }
 
+int do_ubifs_exists(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+       if (!ubifs_mounted) {
+               printf("UBIFS not mounted, use ubifs mount to mount volume 
first!\n");
+               return -1;
+       }
+
+       if (argc != 2)
+               return CMD_RET_USAGE;
+
+       if (!ubifs_exists(argv[1]))
+               return CMD_RET_FAILURE;
+
+       return 0;
+}
+
 U_BOOT_CMD(
        ubifsmount, 2, 0, do_ubifs_mount,
        "mount UBIFS volume",
@@ -171,3 +187,10 @@ U_BOOT_CMD(
        "<addr> <filename> [bytes]\n"
        "    - load file 'filename' to address 'addr'"
 );
+
+U_BOOT_CMD(
+       ubifsexists, 2, 0, do_ubifs_exists,
+       "check file exists on an UBIFS filesystem",
+       "<filename>\n"
+       "    - check 'filename' exists"
+);
diff --git a/fs/ubifs/ubifs.c b/fs/ubifs/ubifs.c
index 6dd6174..2ef6ab8 100644
--- a/fs/ubifs/ubifs.c
+++ b/fs/ubifs/ubifs.c
@@ -857,3 +857,15 @@ out:
        ubi_close_volume(c->ubi);
        return err;
 }
+
+int ubifs_exists(char *filename)
+{
+       struct ubifs_info *c = ubifs_sb->s_fs_info;
+       unsigned long inum;
+
+       c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
+       inum = ubifs_findfile(ubifs_sb, filename);
+       ubi_close_volume(c->ubi);
+
+       return inum != 0;
+}
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index a51b237..070fcde 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -2385,5 +2385,6 @@ int uboot_ubifs_mount(char *vol_name);
 void ubifs_umount(struct ubifs_info *c);
 int ubifs_ls(char *dir_name);
 int ubifs_load(char *filename, u32 addr, u32 size);
+int ubifs_exists(char *filename);
 #endif
 #endif /* !__UBIFS_H__ */
-- 
2.4.3

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