From: Stephen Warren swarren@nvidia.com
This could be used in scripts such as:
if exists 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 --- common/cmd_fs.c | 14 ++++++++++++++ fs/fs.c | 38 ++++++++++++++++++++++++++++++++++++++ include/fs.h | 10 ++++++++++ 3 files changed, 62 insertions(+)
diff --git a/common/cmd_fs.c b/common/cmd_fs.c index 91a205ac1e69..44b00cd125b7 100644 --- a/common/cmd_fs.c +++ b/common/cmd_fs.c @@ -49,3 +49,17 @@ U_BOOT_CMD( " - List files in directory 'directory' of partition 'part' on\n" " device type 'interface' instance 'dev'." ); + +int do_exists_wrapper(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + return do_exists(cmdtp, flag, argc, argv, FS_TYPE_ANY); +} + +U_BOOT_CMD( + exists, 4, 0, do_exists_wrapper, + "determine whether a file exists", + "<interface> <dev[:part]> filename\n" + " - Determine whether 'filename' exists in partition 'part' on\n" + " device type 'interface' instance 'dev', and set the command.\n" + " exit status so that 'if exists ...; then' works.\n" +); diff --git a/fs/fs.c b/fs/fs.c index 9c2ef6b6597c..f3d9a1c6bc7d 100644 --- a/fs/fs.c +++ b/fs/fs.c @@ -41,6 +41,11 @@ static inline int fs_ls_unsupported(const char *dirname) return -1; }
+static inline int fs_exists_unsupported(const char *filename) +{ + return -1; +} + static inline int fs_read_unsupported(const char *filename, void *buf, int offset, int len) { @@ -62,6 +67,7 @@ struct fstype_info { int (*probe)(block_dev_desc_t *fs_dev_desc, disk_partition_t *fs_partition); int (*ls)(const char *dirname); + int (*exists)(const char *filename); int (*read)(const char *filename, void *buf, int offset, int len); int (*write)(const char *filename, void *buf, int offset, int len); void (*close)(void); @@ -74,6 +80,7 @@ static struct fstype_info fstypes[] = { .probe = fat_set_blk_dev, .close = fat_close, .ls = file_fat_ls, + .exists = fs_exists_unsupported, .read = fat_read_file, .write = fs_write_unsupported, }, @@ -84,6 +91,7 @@ static struct fstype_info fstypes[] = { .probe = ext4fs_probe, .close = ext4fs_close, .ls = ext4fs_ls, + .exists = fs_exists_unsupported, .read = ext4_read_file, .write = fs_write_unsupported, }, @@ -94,6 +102,7 @@ static struct fstype_info fstypes[] = { .probe = sandbox_fs_set_blk_dev, .close = sandbox_fs_close, .ls = sandbox_fs_ls, + .exists = fs_exists_unsupported, .read = fs_read_sandbox, .write = fs_write_sandbox, }, @@ -103,6 +112,7 @@ static struct fstype_info fstypes[] = { .probe = fs_probe_unsupported, .close = fs_close_unsupported, .ls = fs_ls_unsupported, + .exists = fs_exists_unsupported, .read = fs_read_unsupported, .write = fs_write_unsupported, }, @@ -184,6 +194,19 @@ int fs_ls(const char *dirname) return ret; }
+int fs_exists(const char *filename) +{ + int ret; + + struct fstype_info *info = fs_get_info(fs_type); + + ret = info->exists(filename); + + fs_close(); + + return ret; +} + int fs_read(const char *filename, ulong addr, int offset, int len) { struct fstype_info *info = fs_get_info(fs_type); @@ -309,6 +332,21 @@ int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[], return 0; }
+int do_exists(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[], + int fstype) +{ + if (argc != 4) + return CMD_RET_USAGE; + + if (fs_set_blk_dev(argv[1], argv[2], fstype)) + return 1; + + if (fs_exists(argv[3])) + return 1; + + return 0; +} + int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[], int fstype) { diff --git a/include/fs.h b/include/fs.h index 97b0094e954b..b8b7706410ad 100644 --- a/include/fs.h +++ b/include/fs.h @@ -44,6 +44,14 @@ 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 0 if the file exists, non-zero if it doesn't exist. + * This encoding was picked to help shell command implementation. + */ +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" * bytes. "offset" may be 0 to read from the start of the file. "len" may be @@ -72,6 +80,8 @@ 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 do_exists(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[], + int fstype); int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[], int fstype);