hush: do not convert to return code too early ...

parse_stream_outer used to convert a exit value to a return code,
but parse_stream_outer maybe inside a recursion. This means that
the exit status is lost in this case. Test case:

if [ 0 = 0 ]; then
	false
	exit $?
fi

echo "shouldn't be here"

Without this patch "shouldn't be here" will be printed.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

run_shell: run again on ctrl-c ...

We can start a new interactive shell now using the 'sh' command on
the command line. This shell exits on ctrl-c though. Add a loop
around it to continue instead of exiting.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'next' ...

Conflicts:
	common/hush.c

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: bail out of scripts on syntax error ...

On a systax error we have to bail out of the shell instead of
setting inp->p to NULL and crash barebox with a NULL pointer
deref. This only happened in scripts.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

This fixes the problem I had (i.e. a boot loop caused by a stray fi in
/env/bin/init).

Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Tested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

hush: allow to run interactive shell in do_sh ...

This allows to call 'sh' in scripts without arguments in which
case an interactive shell will be started.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: Fix globbing ...

hush has a long standing and anoying glob bug. hush expands wildcards
during parsing of the script or command stream. When the command stream
begins to execute the wildcards are already expanded which leads to:

mkdir /tmp
cd /tmp
mkdir foo; ls *
ls: *: No such file or directory

To fix this expand wildcards right before executing the command. Since
'for' loops are not executed in commands, we have to keep the old behaviour
in here so that 'for i in *' still works.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: pass GLOB_NOCHECK to glob ...

By doing so glob will not return GLOB_NOMATCH anymore but instead
just does what fake_glob would do.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: simplify globhack ...

hush used to escape '*' '[' '?' during parsing because the quotes
got removed in the first parsing loop.

globhack is used to remove these escapes again for glob. Since we now
keep the quotes until the end of parsing and we no longer escape glob
wildcards, we do no longer have to remove any quotes. With this globhack
can be much simpler.

While at it, change the prototype to match the one from glob() and rename
the function to fake_glob, because that's what it is: it just copies the
input string into the output struct without actually globbing.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: remove quotes at end of processing ...

hush removes the quotes from strings too early. This leads to some bugs.
When hush executes

echo "hello sascha"

it correctly results in:

argv[0] = "echo"
argv[1] = "hello sascha"

However, the following behaves incorrect:

a="hello sascha"
echo "$a"

results in:

argv[0] = "echo"
argv[1] = "hello"
argv[2] = "sascha"

This is because hush removes the quotes and inserts variable values in a
single loop, so

echo "$a"

becomes:

echo hello sascha

after the loop.

Instead, keep the quotes until all variables are inserted and remove them
at the end.

This also fixes that echo \" resulted in \" instead of ".

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: run_pipe_real: bail out early to safe an indention level ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: run_pipe_real must have num_progs == 1 ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: remove bogus 'else' ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: cleanup coding style ...

General coding style cleanup

- add some blank lines
- add whitespaces on on both sides of operators

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: safe an indention level by continueing a loop ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: safe indention level by continueing a loop ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Introduce binfmt support ...

This will allow to execute any file and detect it's type to handle it.
This will allow to use shell for bootp bootfile or dfu.

You can register multiple hook for the same filetype. They will be execute
in the invert order of register. If a hook does not handle the file you just
return -ERESTARTNOHAND;

This is only available with hush parser.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

hush source: expand $PATH ...

The behaviour of other shells suggest that with source or '.'
the path should be resolved using the PATH environment variable. Do
the same in barebox.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands: remove struct command pointer from commands ...

This is unused in all commands and thus can be removed.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

getopt: save and restore context ...

execute_command is the single point where commands are executed and thus a new
getopt context is needed. currently we call getopt_reset here to reset the
context. This breaks though when a command tries to run a command itself by
calling execute_command or run_command.  In this case we have to store the
context and restore it afterwards. The same is necessary in builtin_getopt.
Currently noone does this so this one shouldn't fix a bug, but merely allows
us to do such things later.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: Add magicvars ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

move simple_itoa to libbb so that others can use it ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: sparse fixes ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: implement getopt builtin ...

Positional parameters are not nice, so implement a getopt
function. This has to be done as a builtin because otherwise
we have no access to the parents argc/argv.

getopt works as expected, here is a little example:

while getopt "hs:" OPT
do
        if [ $OPT = h ]; then
                echo "usage"
                exit 1
        else
                echo "scr: opt: $OPT optarg: $OPTARG"
	fi
done

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: fix nasty memory leak in hush ...

Fix memory leak in globbing part of hush. a simple '['
on the command line was enough to trigger it.
We must call globfree() before setting the glob structure
to zero.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: pass context around in shell ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: allow fancy prompts ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: only remove backslashes introduced from glob ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

hush: Fix return code when calling 'exit' inside loops ...

v2: Do not exit from all scripts but only the current one

This fixes the case:

barebox:/ cat /test
if [ 0 = 0 ]; then
	exit 1
fi
barebox:/ /test
barebox:/ echo $?
0
barebox:/

Also, remove code to not allow exit from main shell. The for(;;) loop
in common/startup.c will bring us back anyway.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

remove typedef cmd_tbl_t and replace it with struct command ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

rename U-Boot-v2 project to barebox ...

This has been done with the following script:

find -path ./.git -prune -o -type f -print0 | xargs -0 -r sed -i \
	-e 's/u2boot/barebox/g' \
	-e 's/U2Boot/barebox/g' \
	-e 's/U-boot V2/barebox/g' \
	-e 's/u-boot v2/barebox/g' \
	-e 's/U-Boot V2/barebox/g' \
	-e 's/U-Boot-v2/barebox/g' \
	-e 's/U_BOOT/BAREBOX/g' \
	-e 's/UBOOT/BAREBOX/g' \
	-e 's/uboot/barebox/g' \
	-e 's/u-boot/barebox/g' \
	-e 's/u_boot/barebox/g' \
	-e 's/U-Boot/barebox/g' \
	-e 's/U-boot/barebox/g' \
	-e 's/U-BOOT/barebox/g'

find -path ./.git -prune -o \( -name "*u-boot*" -o -name "*uboot*" -o -name "*u_boot*" \) -print0 | \
	xargs -0 -r rename 's/u[-_]?boot/barebox/'

It needs some manual fixup following in the next patch

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>