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run-command: show prepared command

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This adds a trace point in start_command so we can see the full
command invocation without having to resort to strace/code inspection.
For example:

 $ GIT_TRACE=1 git test foo
 git.c:755               trace: exec: git-test foo
 run-command.c:657       trace: run_command: git-test foo
 run-command.c:657       trace: run_command: 'echo $*' foo
 run-command.c:749       trace: start_command: /bin/sh -c 'echo $* "$@"' 'echo $*' foo

Prior changes have made the documentation around the internals of the
alias command execution clearer, but I have still found this detailed
view of the aliased command being run helpful for debugging purposes.

A test case is added to ensure the full command output is present in
the execution flow.

Signed-off-by: Ian Wienand <iwienand@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ian Wienand
2024-05-27 10:30:49 +10:00
committed by Junio C Hamano
parent d35a743659
commit 291ef5b61c
2 changed files with 14 additions and 0 deletions
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3
run-command.c
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@ -746,6 +746,8 @@ fail_pipe:
goto end_of_spawn;
}
trace_argv_printf(&argv.v[1], "trace: start_command:");
if (pipe(notify_pipe))
notify_pipe[0] = notify_pipe[1] = -1;
@ -913,6 +915,7 @@ end_of_spawn:
else if (cmd->use_shell)
cmd->args.v = prepare_shell_cmd(&nargv, sargv);
trace_argv_printf(cmd->args.v, "trace: start_command:");
cmd->pid = mingw_spawnvpe(cmd->args.v[0], cmd->args.v,
(char**) cmd->env.v,
cmd->dir, fhin, fhout, fherr);