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Francis Laniel <francis.laniel@amarulasolutions.com> says: During 2021 summer, Sean Anderson wrote a contribution to add a new shell, based on LIL, to U-Boot [1, 2]. While one of the goals of this contribution was to address the fact actual U-Boot shell, which is based on Busybox hush, is old there was a discussion about adding a new shell versus updating the actual one [3, 4]. So, in this series, with Harald Seiler, we updated the actual U-Boot shell to reflect what is currently in Busybox source code. Basically, this contribution is about taking a snapshot of Busybox shell/hush.c file (as it exists in commit 37460f5da) and adapt it to suit U-Boot needs. This contribution was written to be as backward-compatible as possible to avoid breaking the existing. So, the modern hush flavor offers the same as the actual, that is to say: 1. Variable expansion. 2. Instruction lists (;, && and ||). 3. If, then and else. 4. Loops (for, while and until). No new features offered by Busybox hush were implemented (e.g. functions). It is possible to change the parser at runtime using the "cli" command: => cli print old => cli set modern => cli print modern => cli set old The default parser is the old one. Note that to use both parser, you would need to set both CONFIG_HUSH_MODERN_PARSER and CONFIG_HUSH_OLD_PARSER. In terms of testing, new unit tests were added to ut to ensure the new behavior is the same as the old one and it does not add regression. Nonetheless, if old behavior was buggy and fixed upstream, the fix is then added to U-Boot [5]. In sandbox, all of these tests pass smoothly: => printenv board board=sandbox => ut hush Running 20 hush tests ... Failures: 0 => cli set modern => ut hush Running 20 hush tests ... Failures: 0 Thanks to the effort of Harald Seiler, I was successful booting a board: => printenv fdtfile fdtfile=amlogic/meson-gxl-s905x-libretech-cc.dtb => cli get old => boot ... root@lepotato:~# root@lepotato:~# reboot ... => cli set modern => cli get modern => printenv fdtfile fdtfile=amlogic/meson-gxl-s905x-libretech-cc.dtb => boot ... root@lepotato:~# This contribution indeed adds a lot of code and there were concern about its size [6, 7]. With regard to the amount of code added, the cli_hush_upstream.c is 13030 lines long but it seems a smaller subset is really used: gcc -D__U_BOOT__ -E common/cli_hush_upstream.c | wc -l 2870 Despite this, it is better to still have the whole upstream code for the sake of easing maintenance. With regard to memory size, I conducted some experiments for version 8 of this series and for a subset of arm64 boards and found the worst case to be 4K [8]. Tom Rini conducted more research on this and also found the increase to be acceptable [9]. If you want to review it - your review will really be appreciated - here are some information regarding the commits: * commits marked as "test:" deal with unit tests. * commit "cli: Add Busybox upstream hush.c file." copies Busybox shell/hush.c into U-Boot tree, this explain why this commit contains around 12000 additions. * commit "cli: Port Busybox 2021 hush to U-Boot." modifies previously added file to permit us to use this as new shell. The really good idea of #include'ing Busybox code into a wrapper file to define some particular functions while minimizing modifications to upstream code comes from Harald Seiler. * commit "cmd: Add new parser command" adds a new command which permits selecting parser at runtime. I am not really satisfied with the fact it calls cli_init() and cli_loop() each time the parser is set, so your reviews would be welcomed. * Other commits focus on enabling features we need (e.g. if).
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* (C) Copyright 2021
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* Francis Laniel, Amarula Solutions, francis.laniel@amarulasolutions.com
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*/
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#include <command.h>
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#include <env_attr.h>
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#include <test/hush.h>
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#include <test/ut.h>
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#include <asm/global_data.h>
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DECLARE_GLOBAL_DATA_PTR;
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static int hush_test_for(struct unit_test_state *uts)
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{
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console_record_reset_enable();
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ut_assertok(run_command("for loop_i in foo bar quux quux; do echo $loop_i; done", 0));
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ut_assert_nextline("foo");
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ut_assert_nextline("bar");
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ut_assert_nextline("quux");
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ut_assert_nextline("quux");
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ut_assert_console_end();
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if (gd->flags & GD_FLG_HUSH_MODERN_PARSER) {
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/* Reset local variable. */
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ut_assertok(run_command("loop_i=", 0));
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} else if (gd->flags & GD_FLG_HUSH_OLD_PARSER) {
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puts("Beware: this test set local variable loop_i and it cannot be unset!");
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}
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return 0;
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}
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HUSH_TEST(hush_test_for, 0);
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static int hush_test_while(struct unit_test_state *uts)
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{
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console_record_reset_enable();
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if (gd->flags & GD_FLG_HUSH_MODERN_PARSER) {
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/*
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* Hush 2021 always returns 0 from while loop...
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* You can see code snippet near this line to have a better
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* understanding:
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* debug_printf_exec(": while expr is false: breaking (exitcode:EXIT_SUCCESS)\n");
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*/
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ut_assertok(run_command("while test -z \"$loop_foo\"; do echo bar; loop_foo=quux; done", 0));
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} else if (gd->flags & GD_FLG_HUSH_OLD_PARSER) {
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/*
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* Exit status is that of test, so 1 since test is false to quit
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* the loop.
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*/
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ut_asserteq(1, run_command("while test -z \"$loop_foo\"; do echo bar; loop_foo=quux; done", 0));
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}
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ut_assert_nextline("bar");
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ut_assert_console_end();
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if (gd->flags & GD_FLG_HUSH_MODERN_PARSER) {
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/* Reset local variable. */
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ut_assertok(run_command("loop_foo=", 0));
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} else if (gd->flags & GD_FLG_HUSH_OLD_PARSER) {
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puts("Beware: this test set local variable loop_foo and it cannot be unset!");
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}
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return 0;
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}
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HUSH_TEST(hush_test_while, 0);
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static int hush_test_until(struct unit_test_state *uts)
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{
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console_record_reset_enable();
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env_set("loop_bar", "bar");
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/*
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* WARNING We have to use environment variable because it is not possible
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* resetting local variable.
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*/
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ut_assertok(run_command("until test -z \"$loop_bar\"; do echo quux; setenv loop_bar; done", 0));
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ut_assert_nextline("quux");
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ut_assert_console_end();
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/*
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* Loop normally resets foo environment variable, but we reset it here in
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* case the test failed.
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*/
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env_set("loop_bar", NULL);
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return 0;
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}
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HUSH_TEST(hush_test_until, 0);
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