From: Stephen Warren <swar...@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 <swar...@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);
--
1.8.1.5
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