[Buildroot] [PATCH RFC] core: enable per-package log files

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Hello,

Thanks for participating into the discussion and trying to prototype
other solutions! I'm happy to make the connection between your nickname
on IRC, and the real person: we have met several times at Kernel
Recipes! :-)

On Mon, 16 Oct 2017 18:20:01 +0200, Anisse Astier wrote:

> -	$(foreach hook,$($(PKG)_PRE_EXTRACT_HOOKS),$(call $(hook))$(sep))
> +	$(foreach hook,$($(PKG)_PRE_EXTRACT_HOOKS),$(call $(hook)) >> $($(PKG)_LOGFILE) 2>&1 $(sep))

Are you sure this is working for multi-line hooks ? I think hooks
suffer from the same problem as commands.

>  	$(Q)mkdir -p $(@D)
> -	$($(PKG)_EXTRACT_CMDS)
> +	@$(call exportvar,$(PKG)_EXTRACT_CMDS)

Why do variables need to be exported? Isn't their value passed as
argument to the recipe-forward-log script ?

> diff --git a/support/scripts/recipe-forward-log b/support/scripts/recipe-forward-log
> new file mode 100755
> index 0000000..8240d74
> --- /dev/null
> +++ b/support/scripts/recipe-forward-log
> @@ -0,0 +1,59 @@
> +#!/usr/bin/env python3
> +
> +import sys
> +import subprocess
> +
> +
> +DEBUG = False
> +
> +if len(sys.argv) < 2:
> +    print("usage: %s <log-file> <make-recipe>" % (sys.argv[0]))
> +    sys.exit(-1)
> +
> +
> +def dprint(*pargs):
> +    if DEBUG:
> +        print(*pargs)
> +
> +log_file = sys.argv[1]
> +
> +args = sys.argv[2:]
> +
> +dprint("args: %s" % (args))
> +if len(args) == 1 and len(args[0]) == 0:
> +    sys.exit(0)  # only one empty argument, supported use case
> +
> +for arg in args:
> +    for line in arg.splitlines():
> +        dprint("line: %s" % (line))
> +        if line[0] != '\t':
> +            print("Recipe line does not start with tab, aborting: %s" % (line))
> +            sys.exit(-1)
> +        line = line[1:]  # remove initial tab
> +        if len(line) == 0:
> +            continue  # empty lines are tolerated
> +        print_command = True
> +        stop_on_err = True
> +        while True:
> +            if line[0] == '@':
> +                dprint("silent mode")
> +                print_command = False
> +                line = line[1:]
> +            elif line[0] == '-':
> +                dprint("ignore err mode")
> +                stop_on_err = False
> +                line = line[1:]
> +            elif line[0] == '+':  # ignore
> +                dprint("jobserver MAKEFLAGS mode")
> +                line = line[1:]
> +            else:  # no more matching initial recipe character
> +                break
> +        if print_command:
> +            print(line)
> +        proc = subprocess.Popen(line, shell=True, stdout=subprocess.PIPE,
> +                                stderr=subprocess.STDOUT)
> +        tee = subprocess.call(["tee", "-a", log_file], stdin=proc.stdout,
> +                              stdout=sys.stdout)
> +        ret = proc.wait()
> +        if ret != 0 and stop_on_err:
> +            sys.exit(ret)

How many packages have you tested with this? I'm just a little bit
concerned with this parsing, and how it could break with arbitrary (but
valid) make commands.

But besides that, I have to say your approach overall looks
interesting, and probably less hackish than the global shell wrapper
approach.

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com