[Buildroot] [PATCH 1/5 v2] package/pkg-cargo: allow packages to define download environment

[Buildroot] [PATCH 1/5 v2] package/pkg-cargo: allow packages to define download environment

[yann.morin]

From: "Yann E. MORIN" <yann.morin@orange.com>

Currently, the cargo infrastructure forcibly sets the package _DL_ENV
variable, instead of appending to it, which prevents packages from
providing their own download environment variables.

We fix that by using an append-assignment.

Note: when introduced, that variable was explicitly not documented, and
is supposed to only be used by packages infrastructures. However, that
variable exists, and it can be (ab)used by br2-external packages (most
probably to ill effects, but heh!). We anyway leave it undocumented,
like _ROOTFS_PRE_CMD_HOOKS.

Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
---
 package/pkg-cargo.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/pkg-cargo.mk b/package/pkg-cargo.mk
index e74a8358bc..66bea513e0 100644
--- a/package/pkg-cargo.mk
+++ b/package/pkg-cargo.mk
@@ -69,7 +69,7 @@ define inner-cargo-package
 $(2)_DOWNLOAD_DEPENDENCIES += host-rustc
 
 $(2)_DOWNLOAD_POST_PROCESS = cargo
-$(2)_DL_ENV = CARGO_HOME=$$(HOST_DIR)/share/cargo
+$(2)_DL_ENV += CARGO_HOME=$$(HOST_DIR)/share/cargo
 
 # Due to vendoring, it is pretty likely that not all licenses are
 # listed in <pkg>_LICENSE.
-- 
2.25.1


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Re: [Buildroot] [PATCH 1/5 v2] package/pkg-cargo: allow packages to define download environment

[Thomas Petazzoni via buildroot]

On Wed, 9 Feb 2022 17:08:43 +0100
<yann.morin@orange.com> wrote:

> From: "Yann E. MORIN" <yann.morin@orange.com>
> 
> Currently, the cargo infrastructure forcibly sets the package _DL_ENV
> variable, instead of appending to it, which prevents packages from
> providing their own download environment variables.
> 
> We fix that by using an append-assignment.
> 
> Note: when introduced, that variable was explicitly not documented, and
> is supposed to only be used by packages infrastructures. However, that
> variable exists, and it can be (ab)used by br2-external packages (most
> probably to ill effects, but heh!). We anyway leave it undocumented,
> like _ROOTFS_PRE_CMD_HOOKS.
> 
> Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

-- 
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Embedded Linux and Kernel engineering and training
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Re: [Buildroot] [PATCH 1/5 v2] package/pkg-cargo: allow packages to define download environment

[Thomas Petazzoni via buildroot]

On Wed, 9 Feb 2022 17:08:43 +0100
<yann.morin@orange.com> wrote:

>  $(2)_DOWNLOAD_POST_PROCESS = cargo
> -$(2)_DL_ENV = CARGO_HOME=$$(HOST_DIR)/share/cargo
> +$(2)_DL_ENV += CARGO_HOME=$$(HOST_DIR)/share/cargo

But, but, then, how is:

PYTHON_CRYPTOGRAPHY_DL_ENV = \
        BR_CARGO_MANIFEST_PATH=src/rust/Cargo.toml

currently working?

Thomas
-- 
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Embedded Linux and Kernel engineering and training
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Re: [Buildroot] [PATCH 1/5 v2] package/pkg-cargo: allow packages to define download environment

[Yann E. MORIN]

Thomas, All,

On 2022-02-09 20:52 +0100, Thomas Petazzoni via buildroot spake thusly:
> On Wed, 9 Feb 2022 17:08:43 +0100
> <yann.morin@orange.com> wrote:
> >  $(2)_DOWNLOAD_POST_PROCESS = cargo
> > -$(2)_DL_ENV = CARGO_HOME=$$(HOST_DIR)/share/cargo
> > +$(2)_DL_ENV += CARGO_HOME=$$(HOST_DIR)/share/cargo
> 
> But, but, then, how is:
> 
> PYTHON_CRYPTOGRAPHY_DL_ENV = \
>         BR_CARGO_MANIFEST_PATH=src/rust/Cargo.toml
> 
> currently working?

Because, its the name implies, it is a python-package, not a
cargo-package.

Yeah, I got puzzled too. ;-)

Regards,
Yann E. MORIN.

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Re: [Buildroot] [PATCH 1/5 v2] package/pkg-cargo: allow packages to define download environment

[Thomas Petazzoni via buildroot]

On Wed, 9 Feb 2022 21:55:27 +0100
"Yann E. MORIN" <yann.morin.1998@free.fr> wrote:

> > But, but, then, how is:
> > 
> > PYTHON_CRYPTOGRAPHY_DL_ENV = \
> >         BR_CARGO_MANIFEST_PATH=src/rust/Cargo.toml
> > 
> > currently working?  
> 
> Because, its the name implies, it is a python-package, not a
> cargo-package.
> 
> Yeah, I got puzzled too. ;-)

Aah, yes. Indeed. A python-package that builds Rust stuff. I wonder how
it's possible for me to forget this, after having spent so many hours
on this particular package! :-)

Thomas
-- 
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Embedded Linux and Kernel engineering and training
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[Buildroot] [PATCH 2/5 v2] package/pkg-cargo: allow building in a sub-directory

[yann.morin]

From: "Yann E. MORIN" <yann.morin@orange.com>

Some packages have their rust sources as a sub-directory, rather
than at the root of the source tree.

Do like we do for autotools-package, and use the package's _SRCDIR
rather than the top-level directory $(@D).

Additionally, in such a situation, it is more than probable that
the Cargo.toml is also present in that sub-directory, so use that
when vendoring the package, unless the package took extra precautions
to specify an alternate location.

Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

---
Changes v1 -> v2:
  - fix conditional (inverted logic)
  - fix syntax in conditional (missing comma)
---
 package/pkg-cargo.mk | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/package/pkg-cargo.mk b/package/pkg-cargo.mk
index 66bea513e0..e1d81197b5 100644
--- a/package/pkg-cargo.mk
+++ b/package/pkg-cargo.mk
@@ -71,6 +71,14 @@ $(2)_DOWNLOAD_DEPENDENCIES += host-rustc
 $(2)_DOWNLOAD_POST_PROCESS = cargo
 $(2)_DL_ENV += CARGO_HOME=$$(HOST_DIR)/share/cargo
 
+# If building in a sub directory, use that to find the Cargo.toml, unless
+# the package already provided its location.
+ifneq ($$($(2)_SUBDIR),)
+ifeq ($$(filter BR_CARGO_MANIFEST_PATH=%,$$($(2)_DL_ENV)),)
+$(2)_DL_ENV += BR_CARGO_MANIFEST_PATH=$$($(2)_SUBDIR)/Cargo.toml
+endif
+endif
+
 # Due to vendoring, it is pretty likely that not all licenses are
 # listed in <pkg>_LICENSE.
 $(2)_LICENSE += , vendored dependencies licenses probably not listed
@@ -97,7 +105,7 @@ $(2)_LICENSE += , vendored dependencies licenses probably not listed
 ifndef $(2)_BUILD_CMDS
 ifeq ($(4),target)
 define $(2)_BUILD_CMDS
-	cd $$(@D) && \
+	cd $$($$(PKG)_SRCDIR) && \
 	$$(TARGET_MAKE_ENV) \
 		$$(TARGET_CONFIGURE_OPTS) \
 		$$(PKG_CARGO_ENV) \
@@ -111,7 +119,7 @@ define $(2)_BUILD_CMDS
 endef
 else # ifeq ($(4),target)
 define $(2)_BUILD_CMDS
-	cd $$(@D) && \
+	cd $$($$(PKG)_SRCDIR) && \
 	$$(HOST_MAKE_ENV) \
 		RUSTFLAGS="$$(addprefix -C link-args=,$$(HOST_LDFLAGS))" \
 		$$(HOST_CONFIGURE_OPTS) \
@@ -133,7 +141,7 @@ endif # ifndef $(2)_BUILD_CMDS
 #
 ifndef $(2)_INSTALL_TARGET_CMDS
 define $(2)_INSTALL_TARGET_CMDS
-	cd $$(@D) && \
+	cd $$($$(PKG)_SRCDIR) && \
 	$$(TARGET_MAKE_ENV) \
 		$$(TARGET_CONFIGURE_OPTS) \
 		$$(PKG_CARGO_ENV) \
@@ -152,7 +160,7 @@ endif
 
 ifndef $(2)_INSTALL_CMDS
 define $(2)_INSTALL_CMDS
-	cd $$(@D) && \
+	cd $$($$(PKG)_SRCDIR) && \
 	$$(HOST_MAKE_ENV) \
 		RUSTFLAGS="$$(addprefix -C link-args=,$$(HOST_LDFLAGS))" \
 		$$(HOST_CONFIGURE_OPTS) \
-- 
2.25.1


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Re: [Buildroot] [PATCH 2/5 v2] package/pkg-cargo: allow building in a sub-directory

[Thomas Petazzoni via buildroot]

On Wed, 9 Feb 2022 17:08:44 +0100
<yann.morin@orange.com> wrote:

> +# If building in a sub directory, use that to find the Cargo.toml, unless
> +# the package already provided its location.
> +ifneq ($$($(2)_SUBDIR),)
> +ifeq ($$(filter BR_CARGO_MANIFEST_PATH=%,$$($(2)_DL_ENV)),)
> +$(2)_DL_ENV += BR_CARGO_MANIFEST_PATH=$$($(2)_SUBDIR)/Cargo.toml

I find that a bit "meh". Should we have an explicit package variable
that tells the location of the Cargo.toml, instead of directly have
packages pass this "magic" BR_CARGO_MANIFEST_PATH variable ?

Should $(2)_SUBDIR be documented for the cargo-package infra in the
documentation ?

Thomas
-- 
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Embedded Linux and Kernel engineering and training
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Re: [Buildroot] [PATCH 2/5 v2] package/pkg-cargo: allow building in a sub-directory

[yann.morin]

Thomas, All,

On 2022-02-09 20:54 +0100, Thomas Petazzoni spake thusly:
> On Wed, 9 Feb 2022 17:08:44 +0100
> <yann.morin@orange.com> wrote:
> > +# If building in a sub directory, use that to find the Cargo.toml, unless
> > +# the package already provided its location.
> > +ifneq ($$($(2)_SUBDIR),)
> > +ifeq ($$(filter BR_CARGO_MANIFEST_PATH=%,$$($(2)_DL_ENV)),)
> > +$(2)_DL_ENV += BR_CARGO_MANIFEST_PATH=$$($(2)_SUBDIR)/Cargo.toml
> 
> I find that a bit "meh".

I too am not fond of it, to be honest... But I am not a rust/cargo
expert, by far, I wanted not to break any existing setup.

However, the cargo infra is brand new, and BR_CARGO_MANIFEST_PATH was
not even advertised either, so we should probably not have to expect any
package to actually use it already.

> Should we have an explicit package variable
> that tells the location of the Cargo.toml, instead of directly have
> packages pass this "magic" BR_CARGO_MANIFEST_PATH variable ?

I was wondering if that would even make sense to have a different
_SUBDIR and BR_CARGO_MANIFEST_PATH to begin with?

We have a package here that seems to be in such a situation, though:
    https://github.com/Orange-OpenSource/its-client

The Cargo.toml is in rust/ but we need to do the build in
rust/its-client/ ("cargo build" works perfectly well with a virtual
workspace, like is used here, but "cargo install" refuses to work,
muahaha...)

Still, because of a missing Cargo.lock in that package, vendoring by
Buildroot does not work eother (we'll fix that later).

So, for now, I suggest we just expect that BR_CARGO_MANIFEST_PATH is the
same as _SUBDIR, and thus the conditional assignment is not needed.

If in the future we do have an actual, working situation where they
differ, then we may add the necessary infra, seems like a plan?

In the meantime, I'll respin the series with the ugly conditional
removed.

> Should $(2)_SUBDIR be documented for the cargo-package infra in the
> documentation ?

It is not documented for any of the other infras that make use of it
(autotools, cmake, python, etc...).

The only mention of _SUBDIR in the manual is about _SUBDIRS (plural) for
the kernel-module sub-infra.

Thanks for the review!

Regards,
Yann E. MORIN.

> Thomas
> -- 
> Thomas Petazzoni, co-owner and CEO, Bootlin
> Embedded Linux and Kernel engineering and training
> https://bootlin.com

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Re: [Buildroot] [PATCH 2/5 v2] package/pkg-cargo: allow building in a sub-directory

[yann.morin]

Thomas, Alll,

On 2022-02-10 16:08 +0100, MORIN Yann INNOV/IT-S spake thusly:
> On 2022-02-09 20:54 +0100, Thomas Petazzoni spake thusly:
> > Should $(2)_SUBDIR be documented for the cargo-package infra in the
> > documentation ?
> It is not documented for any of the other infras that make use of it
> (autotools, cmake, python, etc...).
> The only mention of _SUBDIR in the manual is about _SUBDIRS (plural) for
> the kernel-module sub-infra.

Scratch that, I seem to be unable to do a proper search in a webpage...
:-(

I'll add it to the cargo part of the manual.

Cordialement,
Yann E. MORIN.

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[Buildroot] [PATCH 3/5 v2] package/pkg-cargo: host-rustc is also a build dependency

[yann.morin]

From: "Yann E. MORIN" <yann.morin@orange.com>

Currently, host-rustc is a download dependency, because we need cargo
for the vendoring during the downlaod step.

However, when using a package in override-srcdir, there is no download
step, so host-rustc is not pulled in as a dependency which breaks
running the build of a single pcakge from scratch:
    $ make clean
    $ make my-rust-package
    [...]
    [...] cargo build --offline --release --manifest-path Cargo.toml --locked
    /bin/sh: cargo: command not found

We fix that by adding host-rustc as a standard dependency too.

Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
---
 package/pkg-cargo.mk | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/package/pkg-cargo.mk b/package/pkg-cargo.mk
index e1d81197b5..24dd50e399 100644
--- a/package/pkg-cargo.mk
+++ b/package/pkg-cargo.mk
@@ -65,8 +65,10 @@ HOST_PKG_CARGO_ENV = \
 
 define inner-cargo-package
 
-# We need host-rustc to run cargo
+# We need host-rustc to run cargo at download time (for vendoring),
+# and at build and install time.
 $(2)_DOWNLOAD_DEPENDENCIES += host-rustc
+$(2)_DEPENDENCIES += host-rustc
 
 $(2)_DOWNLOAD_POST_PROCESS = cargo
 $(2)_DL_ENV += CARGO_HOME=$$(HOST_DIR)/share/cargo
-- 
2.25.1


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Re: [Buildroot] [PATCH 3/5 v2] package/pkg-cargo: host-rustc is also a build dependency

[Thomas Petazzoni via buildroot]

On Wed, 9 Feb 2022 17:08:45 +0100
<yann.morin@orange.com> wrote:

> From: "Yann E. MORIN" <yann.morin@orange.com>
> 
> Currently, host-rustc is a download dependency, because we need cargo
> for the vendoring during the downlaod step.

                                ^^^^^^^^ download

> However, when using a package in override-srcdir, there is no download
> step, so host-rustc is not pulled in as a dependency which breaks
> running the build of a single pcakge from scratch:

                                ^^^^^^  package

>     $ make clean
>     $ make my-rust-package
>     [...]
>     [...] cargo build --offline --release --manifest-path Cargo.toml --locked
>     /bin/sh: cargo: command not found
> 
> We fix that by adding host-rustc as a standard dependency too.
> 
> Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

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[Buildroot] [PATCH 4/5 v2] package/pkg-golang: allow packages to define download environment

[yann.morin]

From: "Yann E. MORIN" <yann.morin@orange.com>

Currently, the golang infrastructure forcibly sets the package _DL_ENV
variable, instead of appending to it, which prevents packages from
providing their own download environment variables.

We fix that by using an append-assignment.

Note: when introduced, that variable was explicitly not documented, and
is supposed to only be used by packages infrastructures. However, that
variable exists, and it can be (ab)used by br2-external packages (most
probably to ill effects, but heh!). We anyway leave it undocumented,
like _ROOTFS_PRE_CMD_HOOKS.

Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Christian Stewart <christian@paral.in>
Cc: Anisse Astier <anisse@astier.eu>
---
 package/pkg-golang.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/pkg-golang.mk b/package/pkg-golang.mk
index 35bcb1673b..69eae02830 100644
--- a/package/pkg-golang.mk
+++ b/package/pkg-golang.mk
@@ -83,7 +83,7 @@ endef
 $(2)_POST_PATCH_HOOKS += $(2)_GEN_GOMOD
 
 $(2)_DOWNLOAD_POST_PROCESS = go
-$(2)_DL_ENV = \
+$(2)_DL_ENV += \
 	$(HOST_GO_COMMON_ENV) \
 	GOPROXY=direct \
 	BR_GOMOD=$$($(2)_GOMOD)
-- 
2.25.1


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Re: [Buildroot] [PATCH 4/5 v2] package/pkg-golang: allow packages to define download environment

[Thomas Petazzoni via buildroot]

On Wed, 9 Feb 2022 17:08:46 +0100
<yann.morin@orange.com> wrote:

> From: "Yann E. MORIN" <yann.morin@orange.com>
> 
> Currently, the golang infrastructure forcibly sets the package _DL_ENV
> variable, instead of appending to it, which prevents packages from
> providing their own download environment variables.
> 
> We fix that by using an append-assignment.
> 
> Note: when introduced, that variable was explicitly not documented, and
> is supposed to only be used by packages infrastructures. However, that
> variable exists, and it can be (ab)used by br2-external packages (most
> probably to ill effects, but heh!). We anyway leave it undocumented,
> like _ROOTFS_PRE_CMD_HOOKS.
> 
> Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> Cc: Christian Stewart <christian@paral.in>
> Cc: Anisse Astier <anisse@astier.eu>

Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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Re: [Buildroot] [PATCH 4/5 v2] package/pkg-golang: allow packages to define download environment

[Christian Stewart via buildroot]

Hi,

On Wed, Feb 9, 2022 at 8:09 AM <yann.morin@orange.com> wrote:
>
> From: "Yann E. MORIN" <yann.morin@orange.com>
>
> Currently, the golang infrastructure forcibly sets the package _DL_ENV
> variable, instead of appending to it, which prevents packages from
> providing their own download environment variables.
>
> We fix that by using an append-assignment.
>
> Note: when introduced, that variable was explicitly not documented, and
> is supposed to only be used by packages infrastructures. However, that
> variable exists, and it can be (ab)used by br2-external packages (most
> probably to ill effects, but heh!). We anyway leave it undocumented,
> like _ROOTFS_PRE_CMD_HOOKS.
>
> Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> Cc: Christian Stewart <christian@paral.in>
> Cc: Anisse Astier <anisse@astier.eu>
> ---
>  package/pkg-golang.mk | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/package/pkg-golang.mk b/package/pkg-golang.mk
> index 35bcb1673b..69eae02830 100644

Reviewed-by: Christian Stewart <christian@paral.in>

Best,
Christian
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[Buildroot] [PATCH 5/5 v2] package/pkg-golang: host-go is also a build dependency

[yann.morin]

From: "Yann E. MORIN" <yann.morin@orange.com>

Currently, host-go is a download dependency, because we need go for the
vendoring during the downlaod step.

However, when using a package in override-srcdir, there is no download
step, so host-go is not pulled in as a dependency, which will break the
build of a single package from scratch.

We fix that by adding host-go as a standard dependency too.

Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Christian Stewart <christian@paral.in>
Cc: Anisse Astier <anisse@astier.eu>
---
 package/pkg-golang.mk | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/package/pkg-golang.mk b/package/pkg-golang.mk
index 69eae02830..ddefdf1214 100644
--- a/package/pkg-golang.mk
+++ b/package/pkg-golang.mk
@@ -47,8 +47,10 @@ $(2)_BUILD_OPTS += \
 	-trimpath \
 	-p $(PARALLEL_JOBS)
 
-# Target packages need the Go compiler on the host.
+# Target packages need the Go compiler on the host at download time (for
+# vendoring), and at build and install time.
 $(2)_DOWNLOAD_DEPENDENCIES += host-go
+$(2)_DEPENDENCIES += host-go
 
 $(2)_BUILD_TARGETS ?= .
 
-- 
2.25.1


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Re: [Buildroot] [PATCH 5/5 v2] package/pkg-golang: host-go is also a build dependency

[Thomas Petazzoni via buildroot]

On Wed, 9 Feb 2022 17:08:47 +0100
<yann.morin@orange.com> wrote:

> From: "Yann E. MORIN" <yann.morin@orange.com>
> 
> Currently, host-go is a download dependency, because we need go for the
> vendoring during the downlaod step.
> 
> However, when using a package in override-srcdir, there is no download
> step, so host-go is not pulled in as a dependency, which will break the
> build of a single package from scratch.
> 
> We fix that by adding host-go as a standard dependency too.
> 
> Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> Cc: Christian Stewart <christian@paral.in>
> Cc: Anisse Astier <anisse@astier.eu>

Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>


-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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Re: [Buildroot] [PATCH 5/5 v2] package/pkg-golang: host-go is also a build dependency

[Christian Stewart via buildroot]

On Wed, Feb 9, 2022 at 8:09 AM <yann.morin@orange.com> wrote:
>
> From: "Yann E. MORIN" <yann.morin@orange.com>
>
> Currently, host-go is a download dependency, because we need go for the
> vendoring during the downlaod step.
>
> However, when using a package in override-srcdir, there is no download
> step, so host-go is not pulled in as a dependency, which will break the
> build of a single package from scratch.
>
> We fix that by adding host-go as a standard dependency too.
>
> Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> Cc: Christian Stewart <christian@paral.in>
> Cc: Anisse Astier <anisse@astier.eu>
> ---
>  package/pkg-golang.mk | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/package/pkg-golang.mk b/package/pkg-golang.mk
> index 69eae02830..ddefdf1214 100644

Reviewed-by: Christian Stewart <christian@paral.in>

Best,
Christian
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