pkg_install() fails for GitHub package in subdirectory

[paleolimbot]

When trying to install from a package in a subdirectory, I get:

> pak::pkg_install("apache/arrow-nanoarrow/r")
                                                                      
→ Will update 1 package.
→ Will download 1 package with unknown size.
+ nanoarrow 0.0.0.9000 → 0.0.0.9000 👷🏾‍♀️🔧 ⬇ (GitHub: 5d5234d)
? Do you want to continue (Y/n) Y
ℹ Getting 1 pkg with unknown size
✓ Got nanoarrow 0.0.0.9000 (source) (236.48 kB)              
✓ Downloaded 1 package (236.48 kB)in 912ms                   
ℹ Packaging nanoarrow 0.0.0.9000
Error: No root directory found in /private/var/folders/p5/sxv05ml96sd1n2p3ssfhzzth0000gn/T/RtmponxckR/X/nanoarrow or its parent directories. Root criterion: contains a file "DESCRIPTION"
Type .Last.error.trace to see where the error occurred

The equivalent call for remotes seems to work:

remotes::install_github("apache/arrow-nanoarrow/r")
Downloading GitHub repo apache/arrow-nanoarrow@HEAD
✔ checking for file ‘/private/var/folders/p5/sxv05ml96sd1n2p3ssfhzzth0000gn/T/RtmpWIFiBY/remotes162f0305e40be/apache-arrow-nanoarrow-5d5234d/r/DESCRIPTION’ ...
─ preparing ‘nanoarrow’:
✔ checking DESCRIPTION meta-information ...
─ cleaning src
─ checking for LF line-endings in source and make files and shell scripts
─ checking for empty or unneeded directories
─ building ‘nanoarrow_0.0.0.9000.tar.gz’

• installing source package ‘nanoarrow’ ...
  ** using staged installation
  Fetched bundled nanoarrow from https://github.com/apache/arrow-nanoarrow/tree/main/dist
  ** libs
  clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/opt/R/arm64/include -fPIC -falign-functions=64 -Wall -g -O2 -c altrep.c -o altrep.o
  clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/opt/R/arm64/include -fPIC -falign-functions=64 -Wall -g -O2 -c array.c -o array.o
  clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/opt/R/arm64/include -fPIC -falign-functions=64 -Wall -g -O2 -c array_convert_vector.c -o array_convert_vector.o
  clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/opt/R/arm64/include -fPIC -falign-functions=64 -Wall -g -O2 -c array_stream.c -o array_stream.o
  clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/opt/R/arm64/include -fPIC -falign-functions=64 -Wall -g -O2 -c array_view.c -o array_view.o
  clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/opt/R/arm64/include -fPIC -falign-functions=64 -Wall -g -O2 -c buffer.c -o buffer.o
  clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/opt/R/arm64/include -fPIC -falign-functions=64 -Wall -g -O2 -c build_id.c -o build_id.o
  clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/opt/R/arm64/include -fPIC -falign-functions=64 -Wall -g -O2 -c init.c -o init.o
  clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/opt/R/arm64/include -fPIC -falign-functions=64 -Wall -g -O2 -c materialize.c -o materialize.o
  clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/opt/R/arm64/include -fPIC -falign-functions=64 -Wall -g -O2 -c nanoarrow.c -o nanoarrow.o
  clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/opt/R/arm64/include -fPIC -falign-functions=64 -Wall -g -O2 -c pointers.c -o pointers.o
  clang++ -arch arm64 -std=gnu++14 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/opt/R/arm64/include -fPIC -falign-functions=64 -Wall -g -O2 -c pointers_cpp.cc -o pointers_cpp.o
  clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/opt/R/arm64/include -fPIC -falign-functions=64 -Wall -g -O2 -c schema.c -o schema.o
  clang++ -arch arm64 -std=gnu++14 -dynamiclib -Wl,-headerpad_max_install_names -undefined dynamic_lookup -single_module -multiply_defined suppress -L/Library/Frameworks/R.framework/Resources/lib -L/opt/R/arm64/lib -o nanoarrow.so altrep.o array.o array_convert_vector.o array_stream.o array_view.o buffer.o build_id.o init.o materialize.o nanoarrow.o pointers.o pointers_cpp.o schema.o -F/Library/Frameworks/R.framework/.. -framework R -Wl,-framework -Wl,CoreFoundation
  ld: warning: -undefined dynamic_lookup may not work with chained fixups
  installing to /Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/library/00LOCK-nanoarrow/00new/nanoarrow/libs
  ** R
  ** inst
  ** byte-compile and prepare package for lazy loading
  ** help
  *** installing help indices
  ** building package indices
  ** testing if installed package can be loaded from temporary location
  ** checking absolute paths in shared objects and dynamic libraries
  ** testing if installed package can be loaded from final location
  ** testing if installed package keeps a record of temporary installation path
• DONE (nanoarrow)

This would be rather helpful for running CI with a nanoarrow dependency since all those workflows use pak for the dependency install!