[Buildroot] [PATCH 4/4 v2] core: check files are nto touched by more than on package

[Peter Seiderer <ps.report@gmx.net>]

Hello Yann,

typo in the patch title s/nto/not/...

On Sun, 22 Oct 2017 17:15:40 +0200, "Yann E. MORIN" <yann.morin.1998@free.fr> wrote:

> Currently, we do nothing about packages that touch the same file: given
> a specific configuration, the result is reproducible (even though it
> might not be what the user expected) because the build order is
> guaranteed.
> 
> Hwever, when we later introduce top-level parallel buil, we will no

s/Hwever/However/, s/buil/build/

> longer be able to guarantee a build order, by the mere way of it being
> parallel. Reconcialliting all those modified files will be impossible to
> do automatically. The only way will be to  refuse such situations.

s/  / /

Regards,
Peter

> 
> As a preliminary step, introduce a helper script that detects files that
> are being moified by two or more packages, and reports them and the
> impacted packages, at the end of the build.
> 
> The list being reported at the end of the build will make it prominently
> visible in autobuilder results, so we can assess the problem, if any.
> 
> Later on, calling that helper script can be done right after the package
> installation step, to bail out early.
> 
> Thanks Arnout for the pythonist way to write default dictionaries! ;-)
> 
> Note: doing it in python rather than a shell script is impressively
> faster: where the shell script takes ~1.2s on a minimalist build, the
> python script only takes ~0.015s, that is about 80 times faster.
> 
> Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
> Cc: Arnout Vandecappelle <arnout@mind.be>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> Cc: Peter Korsgaard <peter@korsgaard.com>
> ---
>  Makefile                            |  4 ++++
>  support/scripts/check-uniq-files.py | 40 +++++++++++++++++++++++++++++++++++++
>  2 files changed, 44 insertions(+)
>  create mode 100755 support/scripts/check-uniq-files.py
> 
> diff --git a/Makefile b/Makefile
> index 79db7fe48a..f0b60bae5c 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -679,6 +679,10 @@ $(TARGETS_ROOTFS): target-finalize
>  .PHONY: target-finalize
>  target-finalize: $(PACKAGES)
>  	@$(call MESSAGE,"Finalizing target directory")
> +	# Check files that are touched by more than one package
> +	./support/scripts/check-uniq-files.py -t target $(BUILD_DIR)/packages-file-list.txt
> +	./support/scripts/check-uniq-files.py -t staging $(BUILD_DIR)/packages-file-list-staging.txt
> +	./support/scripts/check-uniq-files.py -t host $(BUILD_DIR)/packages-file-list-host.txt
>  	$(foreach hook,$(TARGET_FINALIZE_HOOKS),$($(hook))$(sep))
>  	rm -rf $(TARGET_DIR)/usr/include $(TARGET_DIR)/usr/share/aclocal \
>  		$(TARGET_DIR)/usr/lib/pkgconfig $(TARGET_DIR)/usr/share/pkgconfig \
> diff --git a/support/scripts/check-uniq-files.py b/support/scripts/check-uniq-files.py
> new file mode 100755
> index 0000000000..e77472cf80
> --- /dev/null
> +++ b/support/scripts/check-uniq-files.py
> @@ -0,0 +1,40 @@
> +#!/usr/bin/env python2
> +
> +import sys
> +import csv
> +import argparse
> +from collections import defaultdict
> +
> +warn = 'Warnng: {}s file "{}" is touched by more than one package: {}\n'
> +
> +def main():
> +    parser = argparse.ArgumentParser()
> +    parser.add_argument('packages_file_list', nargs='*',
> +                    help='The packages-file-list to check from')
> +    parser.add_argument('-t', '--type', metavar="TYPE",
> +                        help='Report as a TYPE file (TYPE is either target, staging, or host)')
> +
> +    args = parser.parse_args()
> +
> +    if not len(args.packages_file_list) == 1:
> +        sys.stderr.write('No packages-file-list was provided.\n')
> +        return False
> +
> +    if args.type is None:
> +        sys.stderr.write('No type was provided\n')
> +        return False
> +
> +    file_to_pkg = defaultdict(list)
> +    with open(args.packages_file_list[0], 'rb') as pkg_file_list:
> +        r = csv.reader(pkg_file_list, delimiter=',')
> +        for row in r:
> +            pkg = row[0]
> +            file = row[1]
> +            file_to_pkg[file].append(pkg)
> +
> +    for file in file_to_pkg:
> +        if len(file_to_pkg[file]) > 1:
> +            sys.stderr.write(warn.format(args.type, file, file_to_pkg[file]))
> +
> +if __name__ == "__main__":
> +    sys.exit(main())