cbe95b1a45
We currently need to generate reproducible archives in at least two
locations: the git and svn download backends. We also know of some
future potential use (e.g. the other download backends, like cvs, or
in the upcoming download post-processors for vendoring, like cargo
and go).
However, we are currently limited to a narrow range of tar versions
that we support, to create reproducible archives, because the gnu
format we use has changed with tar 1.30.
As a consequence, and as time advances, more and more distros are,
or will eventually start, shipping with tar 1.30 or later, and thus
we need to always build our on host-tar.
Now, thanks to some grunt work by Vincent, we have a set of options
that we can pass tar, to generate reproducible archives back from
tar-1.27 and up through tar-1.32, the latest released version.
However, those options are non-trivial, so we do not want to have
to repeat those (and maintain them) in multiple locations.
Introduce a helper that can generate a reproducible archive from
an input directory.
The --pax-option, to set specific PAX headers, does not accept
RFC2822 timestamps which value are too away from some fixed point
(set atcompile-time?):
tar: Time stamp is out of allowed range
However, the same timestamps passed as strict compliant ISO 8601 are
accepted, so that's what we expect as a date format.
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Vincent Fazio <vfazio@xes-inc.com>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Reviewed-by: Vincent Fazio <vfazio@xes-inc.com>
---8<------8<------8<------8<---
# Here is a Makefile used to test all the versions of tar, with
# different output formats and different sets of options:
# Versions prior to 1.27 do not build on recent machines, because
# 'gets()' got removed (rightfully so), so don't count them as
# candidates.
VERSIONS = 1.27 1.27.1 1.28 1.29 1.30 1.31 1.32
DATE = Thu 21 May 2020 06:44:11 PM CEST
TARS = \
$(patsubst %,test_gnu_%.tar,$(VERSIONS)) \
$(patsubst %,test_posix_%.tar,$(VERSIONS)) \
$(patsubst %,test_posix_paxoption_%.tar,$(VERSIONS))
all: $(TARS)
sha1sum $(^)
.INTERMEDIATE: test_%.tar
test_gnu_%.tar: tar.% list
./$(<) cf - -C test \
--transform="s#^\./#test-version/#" \
--numeric-owner --owner=0 --group=0 \
--mtime="$(DATE)" \
--format=gnu \
-T list \
>$(@)
test_posix_%.tar: tar.% list
./$(<) cf - -C test \
--transform="s#^\./#test-version/#" \
--numeric-owner --owner=0 --group=0 \
--mtime="$(DATE)" \
--format=posix \
-T list \
>$(@)
test_posix_paxoption_%.tar: tar.% list
./$(<) cf - -C test \
--transform="s#^\./#test-version/#" \
--numeric-owner --owner=0 --group=0 \
--mtime="$(DATE)" \
--format=posix \
--pax-option='delete=atime,delete=ctime,delete=mtime' \
--pax-option='exthdr.name=%d/PaxHeaders/%f,exthdr.mtime={$(DATE)}' \
-T list \
>$(@)
list: .FORCE
list: test
(cd test && find . -not -type d ) |LC_ALL=C sort >$(@)
LONG = L$$(for i in $$(seq 1 200); do printf 'o'; done)ng
test: .FORCE
test:
rm -rf test
mkdir -p test/bar
echo foo >test/Foo
echo bar >test/bar/Bar
ln -s bar/Bar test/buz
echo long >test/Very-$(LONG)-filename
ln test/Very-$(LONG)-filename \
test/short
.PRECIOUS: tar.%
tar.%: tar-%
cd $(<) && ./configure
$(MAKE) -C $(<)
install -m 0755 $(<)/src/tar $(@)
.PRECIOUS: tar-%
tar-%: tar-%.tar.gz
tar xzf $(<)
.PRECIOUS: tar-%.tar.gz
tar-%.tar.gz:
wget "https://ftp.gnu.org/gnu/tar/$(@)"
.FORCE:
clean:
rm -rf tar-* tar.* test_* test list
---8<------8<------8<------8<---
|
||
|---|---|---|
| arch | ||
| board | ||
| boot | ||
| configs | ||
| docs | ||
| fs | ||
| linux | ||
| package | ||
| support | ||
| system | ||
| toolchain | ||
| utils | ||
| .defconfig | ||
| .flake8 | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| CHANGES | ||
| Config.in | ||
| Config.in.legacy | ||
| COPYING | ||
| DEVELOPERS | ||
| Makefile | ||
| Makefile.legacy | ||
| README | ||
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches