tools/pkginfo: simple tool to dump a package.mk

[MilhouseVH]

Tool to dump fully evaluated package variables for a specific package. Additional parameters will be interpreted as variable names to be evaluated.

For example:

$ tools/pkginfo linux PKG_BUILD_PERF
PROJECT=Generic, DEVICE=, ARCH=x86_64
PKG_NAME="linux"
PKG_VERSION="5.0.7"
PKG_SITE="http://www.kernel.org"
PKG_URL="https://www.kernel.org/pub/linux/kernel/v5.x/linux-5.0.7.tar.xz"
PKG_DIR="/home/neil/projects/pullrequest_repos/LibreELEC.tv/packages/linux"
PKG_NEED_UNPACK="/home/neil/projects/pullrequest_repos/LibreELEC.tv/projects/Generic/linux /home/neil/projects/pullrequest_repos/LibreELEC.tv/projects/Generic/patches/linux /home/neil/projects/pullrequest_repos/LibreELEC.tv/projects/Generic/packages/linux /home/neil/projects/pullrequest_repos/LibreELEC.tv/packages/linux /home/neil/projects/pullrequest_repos/LibreELEC.tv/packages/linux-firmware/intel-ucode /home/neil/projects/pullrequest_repos/LibreELEC.tv/packages/linux-firmware/kernel-firmware"
PKG_DEPENDS_UNPACK=""
PKG_DEPENDS_BOOTSTRAP=""
PKG_DEPENDS_INIT="toolchain"
PKG_DEPENDS_HOST="ccache:host openssl:host"
PKG_DEPENDS_TARGET="toolchain cpio:host kmod:host xz:host wireless-regdb keyutils  binutils elfutils libunwind zlib openssl intel-ucode:host kernel-firmware elfutils:host pciutils"
PKG_IS_ADDON="no"
PKG_IS_KERNEL_PKG="yes"
PKG_BUILD_PERF="yes"

[vpeter4]

I think you could remove root path /home/neil/projects/pullrequest_repos/LibreELEC.tv/ because I think it is clear everything happen in LE folder.

[MilhouseVH]

I personally would rather leave it as it is, since the script outputs the actual value of PKG_DIR (or whatever) - if we start manipulating variables to make them cosmetically more appealing then they're no longer the actual values being used by the build system.

[vpeter4]

But this script tools/pkginfo is for human use or for some scripting? If for human then same path again and again is just useless. But that's just me.

[MilhouseVH]

Yes, it's for human consumption and it outputs the actual values without any mangling - stripping $ROOT may not always be desirable depending on how one wants to use what it outputs. If we strip $ROOT from variables then we're no longer outputting the true value, which troubles me.

I'm not sure I envisioned this as being some cosmetically attractive tool, to be honest - it's function is to dump the package variables, accurately, so that there's no uncertainty regarding the value a package is using.

[MilhouseVH]

@vpeter4 how does http://ix.io/1HG6 work for you - just make sure --strip is the first parameter.

[vpeter4]

Looks ok. But as I wrote this should be default output and use argument for full path.
Or ROOT path could be written before packages variable to see where we are atm.

[MilhouseVH]

Hard to know what should be default output as I prefer to see the complete path by default which is what the build system will be using. I guess we'll need to agree to disagree.

[vpeter4]

Well, I will probably not use tool much so I can live with it as is.
If you really insist of having full path then in case there are 2 or more entries write one on every line. This would be at least more readable.

[MilhouseVH]

It's for dumping the variables by default, if you want pretty print I'll take a patch. :)