nixify the project

[rvolosatovs]

• Did a little reorganization of the repo:
  • moved RustStore to top-level
• Check-in Cargo.lock
• Check-in flake.lock
• Removed .cargo target linker overrides etc. (note, that mold is already used by Nixify by default when possible)

Refs rvolosatovs/nixify#199

From root of this repo:

$ nix build -L

Produces:

$ ls result/bin 
server  sync  syncdb

Similarly (on aarch64-darwin):

$ nix build -L '.#RustStore-armv7-unknown-linux-musleabihf'

For android (only supported on x86_64-linux) at this time:

$ nix build -L '.#packages.x86_64-linux.RustStore-aarch64-linux-android'

[rvolosatovs]

I encountered this while building for Android:

RustStore-deps>   = note: ld: error: cannot open Scrt1.o: No such file or directory
RustStore-deps>           ld: error: cannot open crti.o: No such file or directory
RustStore-deps>           ld: error: cannot open crtbeginS.o: No such file or directory
RustStore-deps>           ld: error: unable to find library -lgcc_s
RustStore-deps>           ld: error: unable to find library -lutil
RustStore-deps>           ld: error: unable to find library -lrt
RustStore-deps>           ld: error: unable to find library -lpthread
RustStore-deps>           ld: error: unable to find library -lm
RustStore-deps>           ld: error: unable to find library -ldl
RustStore-deps>           ld: error: unable to find library -lc
RustStore-deps>           ld: error: cannot open crtendS.o: No such file or directory
RustStore-deps>           ld: error: cannot open crtn.o: No such file or directory
RustStore-deps>           clang-14: error: linker command failed with exit code 1 (use -v to see invocation)

It was caused by .cargo target build overrides, so I simply removed the config there and the build succeeded:

$ file ./result/bin/*         
./result/bin/server: ELF 64-bit LSB pie executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /system/bin/linker64, stripped
./result/bin/sync:   ELF 64-bit LSB pie executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /system/bin/linker64, stripped
./result/bin/syncdb: ELF 64-bit LSB pie executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /system/bin/linker64, stripped