Conditional dependencies use the '(!cond) || dep' syntax, whereas
conditional select uses 'dep if cond'.
Add an extra check to suppress emitting a conditional if an equal
conditional select already exists.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

Rework the bundle-libraries.sh implementation to use a more robust approach
for executing host binaries through the shipped ELF loader and libraries.

The previous approach relied on symlinks pointing to a wrapper script which
caused various issues, especially with multicall binaries as the original
argv[0] name was not preserved through the ld.so invocation. Another down-
side was the fact that the actual binaries got moved into another directory
which caused executables to fail looking up resources with paths relative
to the executable location.

The new library wrapper implements the following improvements:

 - Instead of symlinks pointing to a common wrapper, each ELF executable
   is now replaced by a unqiue shell script which retains the original
   program name getting called

 - Instead of letting ld.so invoke the ELF executable directly, launch
   the final ELF binary through a helper program which fixes up the argv[0]
   argument for the target program

 - Support sharing a common location for the bundled libraries instead of
   having one copy in each directory containing wrapped binaries

Finally modify the SDK build to wrap the staging_dir and toolchain binaries
which allows to use the SDK on systems with a different glibc version.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

Signed-off-by: Felix Fietkau <nbd@nbd.name>

This will be used to simplify the build system code for checking hashes.
Instead of using various variants of md5sum / openssl, use one simple
utility for all of them

Signed-off-by: Felix Fietkau <nbd@nbd.name>

Because wget doesn't know how to do Negotiate authentication with a proxy
and curl does, use curl if it's present. The user is expected to have a
~/.curlrc that sets the options necessary for any proxy authentication.

A ~/.curlrc is completely optional however and curl will work in exactly
the same manner as wget without one.

Signed-off-by: Brian J. Murrell <brian@interlinx.bc.ca>
[Jo-Philipp Wich: Rework code to detect curl usability by checking --version,
                  Use vararg style open() to bypass the shell when downloading,
                  Use Text::ParseWords to decompose env vars into arguments]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

The external script used to generate the package lists for the
LEDE wiki's table of packages [1] and package indexes [2] requires
a "Source:" field in the package lists to find package makefiles.
The package makefiles are used to read the package's Category and Submenu.

The "Source:" field was removed in commit
b4aa3c899cbf1f81cd8a1ea197481ac84a9d646e
to reduce package list sizes and lessen opkg issues in low ram devices.

Add a separate package list file with full data to be used by the wiki's script.
It's called Packages.manifest and isn't compressed as it's not necessary.

1. https://lede-project.org/packages/start
2. https://lede-project.org/packages/index/start

Signed-off-by: Alberto Bursi <alberto.bursi@outlook.it>

Signed-off-by: Felix Fietkau <nbd@nbd.name>

This will attempt to automatically fix common mistakes like using MD5
instead of SHA256, using the MD5SUM variable instead of HASH, or even a
missing mirror file hash.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

In the build system, flock will prevent multiple concurrent downloads
for the same file. However, if one download request for the same file is
waiting for another one to finish, it will result in downloading the
same file twice consecutively.

Prevent this issue by exiting immediately if the file has already been
downloaded

Signed-off-by: Felix Fietkau <nbd@nbd.name>

Saves some more space on the package index

Signed-off-by: Felix Fietkau <nbd@nbd.name>