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fs: implement infrastructure for an 'exists' function

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This could be used in scripts such as:

if test -e mmc 0:1 /boot/boot.scr; then
    load mmc 0:1 ${scriptaddr} /boot/boot.scr
    source ${scriptaddr}
fi

rather than:

if load mmc 0:1 ${scriptaddr} /boot/boot.scr; then
    source ${scriptaddr}
fi

This prevents errors being printed by attempts to load non-existent
files, which can be important when checking for a large set of files,
such as /boot/boot.scr.uimg, /boot/boot.scr, /boot/extlinux.conf,
/boot.scr.uimg, /boot.scr, /extlinux.conf.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Stephen Warren
2014-02-03 13:21:00 -07:00
committed by Tom Rini
parent bd6fb31fab
commit 6152916a95
2 changed files with 41 additions and 0 deletions
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9
include/fs.h
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@@ -43,6 +43,13 @@ int fs_set_blk_dev(const char *ifname, const char *dev_part_str, int fstype);
*/
int fs_ls(const char *dirname);
/*
* Determine whether a file exists
*
* Returns 1 if the file exists, 0 if it doesn't exist.
*/
int fs_exists(const char *filename);
/*
* Read file "filename" from the partition previously set by fs_set_blk_dev(),
* to address "addr", starting at byte offset "offset", and reading "len"
@@ -72,6 +79,8 @@ int do_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
int fstype);
int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
int fstype);
int file_exists(const char *dev_type, const char *dev_part, const char *file,
int fstype);
int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
int fstype);