Bad syscall when running on termux

[lucasew]

I just downloaded the aarch64 version, chmod +x then run without parameters. I might hack around with this later.

It's a Redmi Note 5 Pro (whyred) running the latest stock that is based on Android 9.

[pvonmoradi]

I installed proot and guided nix-portable to use local git and proot. Got same error as you.

[Aleksanaa]

Same on OnePlus 9 pro with 5.4.243 kernel.

[wakearray]

Same error on the S24 Ultra trying to unzip zstd. The code in that area is:

for bin in $busyBins; do
    [ ! -e "$dir/busybox/bin/$bin" ] && ln -s busybox "$dir/busybox/bin/$bin"
  done

  export PATH="$dir/busybox/bin"

  # install other binaries
  unzip -qqoj "$self" nix/store/19p4fzsi2cfplknv2mpz4q59jl0sdqab-zstd/bin/zstd -d $dir/bin
chmod +wx $dir/bin/zstd;

  unzip -qqoj "$self" nix/store/qim5npfpw89nzzq1iwmr8zhbiilar2n7-proot/bin/proot -d $dir/bin
chmod +wx $dir/bin/proot;

  unzip -qqoj "$self" nix/store/c9ji7k8kmdpfj2mnh1rjpdg7wpbdxs2b-bwrap/bin/bwrap -d $dir/bin
chmod +wx $dir/bin/bwrap;

  unzip -qqoj "$self" nix/store/shc7yym58533x9xl3d0ppci7nhzi9ri3-nix/bin/nix -d $dir/bin
chmod +wx $dir/bin/nix;

  # install ssl cert bundle
  unzip -poj "$self" nix/store/ydsac02yjmww0xgs3qdxislmky4q43l1-cacerts | $dir/bin/zstd -d > $dir/ca-bundle.crt

  recreate_nix_conf
fi

Could we skip this extraction of zstd? Termux has its own zstd inside the stable repo and trying to run binaries inside the Termux native environment would fail if they weren't compiled for the bionic c compiler, as I understand it.

[wakearray]

Since the error is always with unzip, could the Termux version be missing a compilation option? Here's the results of unzip -version on Termux:

UnZip 6.00 of 20 April 2009, by Info-ZIP.  Maintained by C. Spieler.  Send
bug reports using http://www.info-zip.org/zip-bug.html; see README for details.

Latest sources and executables are at ftp://ftp.info-zip.org/pub/infozip/ ;
see ftp://ftp.info-zip.org/pub/infozip/UnZip.html for other sites.

Compiled with gcc Android (8481493, based on r416183c2) Clang 12.0.9 (https://android.googlesource.com/toolchain/llvm-project c935d99d7cf2016289302412d708641d52d2f7ee) for Unix (Linux ELF) on Aug  9 2022.

UnZip special compilation options:
        ACORN_FTYPE_NFS
        COPYRIGHT_CLEAN (PKZIP 0.9x unreducing method not supported)
        SET_DIR_ATTRIB
        SYMLINKS (symbolic links supported, if RTL and file system permit)
        TIMESTAMP
        UNIXBACKUP
        USE_EF_UT_TIME
        USE_UNSHRINK (PKZIP/Zip 1.x unshrinking method supported)
        USE_DEFLATE64 (PKZIP 4.x Deflate64(tm) supported)
        UNICODE_SUPPORT [wide-chars, char coding: UTF-8] (handle UTF-8 paths)
        LARGE_FILE_SUPPORT (large files over 2 GiB supported)
        ZIP64_SUPPORT (archives using Zip64 for large files supported)
        USE_BZIP2 (PKZIP 4.6+, using bzip2 lib version 1.0.8, 13-Jul-2019)
        VMS_TEXT_CONV
        WILD_STOP_AT_DIR
        [decryption, version 2.11 of 05 Jan 2007]

UnZip and ZipInfo environment options:
           UNZIP:  [none]
        UNZIPOPT:  [none]
         ZIPINFO:  [none]
      ZIPINFOOPT:  [none]

[wakearray]

Ahhh I didn't read it correctly.

This part is unpacking a TON of tools including unzip.

  for bin in $busyBins; do
    [ ! -e "$dir/busybox/bin/$bin" ] && ln -s busybox "$dir/busybox/bin/$bin"
  done

Then this line is making the next lines use the recently extracted binaries instead of the system ones:

  export PATH="$dir/busybox/bin"

And that fails because it's trying to run unzip that hasn't been compiled for bionic in the native Termux environment. >.<

[wakearray]

2 Extra Bytes

I moved the export PATH="$dir/busybox/bin" line to the bottom of the function just above recreate_nix_conf and was able to get a new error message (I later found out I needed to remove the line exporting PATH altogether from that area):

warning [/data/data/com.termux/files/home/nix-portable]:  2 extra bytes at beginning or within zipfile
  (attempting to process anyways)

This is an error some people have used 7zip to get around in other situations, so I installed p7zip and replaced all the unzip commands with 7za. Line 28115:

for bin in $busyBins; do
    [ ! -e "$dir/busybox/bin/$bin" ] && ln -s busybox "$dir/busybox/bin/$bin"
  done

-  export PATH="$dir/busybox/bin"

  # install other binaries
-  unzip -qqoj "$self" nix/store/19p4fzsi2cfplknv2mpz4q59jl0sdqab-zstd/bin/zstd -d $dir/bin
+ 7za e "$self" nix/store/19p4fzsi2cfplknv2mpz4q59jl0sdqab-zstd/bin/zstd -o$dir/bin -y
chmod +wx $dir/bin/zstd;

-  unzip -qqoj "$self" nix/store/qim5npfpw89nzzq1iwmr8zhbiilar2n7-proot/bin/proot -d $dir/bin
+ 7za e "$self" nix/store/qim5npfpw89nzzq1iwmr8zhbiilar2n7-proot/bin/proot -o$dir/bin -y
chmod +wx $dir/bin/proot;

-  unzip -qqoj "$self" nix/store/c9ji7k8kmdpfj2mnh1rjpdg7wpbdxs2b-bwrap/bin/bwrap -d $dir/bin
+ 7za e "$self" nix/store/c9ji7k8kmdpfj2mnh1rjpdg7wpbdxs2b-bwrap/bin/bwrap -o$dir/bin -y
chmod +wx $dir/bin/bwrap;

-  unzip -qqoj "$self" nix/store/shc7yym58533x9xl3d0ppci7nhzi9ri3-nix/bin/nix -d $dir/bin
+ 7za e "$self" nix/store/shc7yym58533x9xl3d0ppci7nhzi9ri3-nix/bin/nix -o$dir/bin -y
chmod +wx $dir/bin/nix;

  # install ssl cert bundle
-  unzip -poj "$self" nix/store/ydsac02yjmww0xgs3qdxislmky4q43l1-cacerts | $dir/bin/zstd -d > $dir/ca-bundle.crt
+ 7za e -so "$self" nix/store/ydsac02yjmww0xgs3qdxislmky4q43l1-cacerts | $dir/bin/zstd -d > $dir/ca-bundle.crt

  recreate_nix_conf
fi

Line 28362:

-unzip -qqp "$self" nix/store/rfp19y4z6d3ahpg6kgygqq0z51l9zdyn-nix-portable-store-tarball/tar         | $dir/bin/zstd -d         | tar -x $missing --strip-components 2
+7za e -so "$self" nix/store/rfp19y4z6d3ahpg6kgygqq0z51l9zdyn-nix-portable-store-tarball/tar | $dir/bin/zstd -d | tar -x $missing --strip-components 2

Permission Denied

The next error I got was for the find command:

find: ‘/’: Permission denied

Find is trying to access root, but that's not something you can even look at on Android using Termux without root. This is where I really show that I have no idea what I'm doing. 😅 From what I understand there's certain system folders needed, like /dev/ that can't be linked fully on Android? This is something I'll look into in a bit.

Looking on my NixOS laptop the command that files delivers this list of files:

/root
/mnt
/run
/sys
/usr
/boot
/srv
/lib64
/bin
/etc
/var
/home
/proc
/tmp
/lost+found
/lib

So I set it to the root path of Termux: /data/data/com.termux.com/files

/data/data/com.termux/files/apps
/data/data/com.termux/files/home
/data/data/com.termux/files/rList
/data/data/com.termux/files/usr
/data/data/com.termux/files/system
/data/data/com.termux/files/vendor
/data/data/com.termux/files/data
/data/data/com.termux/files/apex
/data/data/com.termux/files/linkerconfig
/data/data/com.termux/files/storage
/data/data/com.termux/files/bin
/data/data/com.termux/files/etc
/data/data/com.termux/files/lib
/data/data/com.termux/files/share
/data/data/com.termux/files/tmp
/data/data/com.termux/files/var
/data/data/com.termux/files/proc

Line 28194:

- pathsTopLevel="$(find / -mindepth 1 -maxdepth 1 -not -name nix -not -name dev)"
+ pathsTopLevel="$(find /data/data/com.termux/files -mindepth 1 -maxdepth 1 -not -name nix -not -name dev)"

Fatal Error

After all that, when run without an argument the script said:

Error: please specify the nix binary to execute
Alternatively symlink against ./nix-portable

Success? No. Attempting to actually run anything (like ./nix-portable nix run nixpkgs#htop or even included packages like ./nix-portable pwd) gives yet another error:

Fatal Error: nix is unable to build packages

NP_DEBUG

After setting NP_DEBUG to 1, the output after filtering out all the 7zip spam is:

installing files
figuring out ssl certs
SSL_CERT_FILE not defined. trying to find certs automatically
/etc/ssl/certs does not exist. Will use certs from nixpkgs.
figuring out which runtime to use
bwrap executable: /data/data/com.termux/files/home/.nix-portable/bin/bwrap
nix executable: /data/data/com.termux/files/home/.nix-portable/bin/nix
proot executable: /data/data/com.termux/files/usr/bin/proot
testing all available runtimes...
runtime selected via NP_RUNTIME: proot
NP_RUNTIME: proot
base command will be: /data/data/com.termux/files/usr/bin/proot -r /data/data/com.termux/files/home/.nix-portable/emptyroot -b /dev:/dev -b /data/data/com.termux/files/home/.nix-portable/nix:/nix -b /data/data/com.termux/files/apps:/data/data/com.termux/files/apps -b /data/data/com.termux/files/home:/data/data/com.termux/files/home -b /data/data/com.termux/files/rList:/data/data/com.termux/files/rList -b /data/data/com.termux/files/usr:/data/data/com.termux/files/usr -b /data/data/com.termux/files/system:/data/data/com.termux/files/system -b /data/data/com.termux/files/vendor:/data/data/com.termux/files/vendor -b /data/data/com.termux/files/data:/data/data/com.termux/files/data -b /data/data/com.termux/files/apex:/data/data/com.termux/files/apex -b /data/data/com.termux/files/linkerconfig:/data/data/com.termux/files/linkerconfig -b /data/data/com.termux/files/storage:/data/data/com.termux/files/storage -b /data/data/com.termux/files/bin:/data/data/com.termux/files/bin -b /data/data/com.termux/files/etc:/data/data/com.termux/files/etc -b /data/data/com.termux/files/lib:/data/data/com.termux/files/lib -b /data/data/com.termux/files/share:/data/data/com.termux/files/share -b /data/data/com.termux/files/tmp:/data/data/com.termux/files/tmp -b /data/data/com.termux/files/var:/data/data/com.termux/files/var -b /data/data/com.termux/files/proc:/data/data/com.termux/files/proc -b /system/etc/hosts:/system/etc/hosts -b /system/etc/passwd:/system/etc/passwd -b /system/etc/group:/system/etc/group -b /data/data/com.termux/files/home:/data/data/com.termux/files/home -b /data/data/com.termux/files/home/.nix-portable/ca-bundle.crt:/data/data/com.termux/files/home/.nix-portable/ca-bundle.crt
Testing if nix can build stuff without sandbox
Fatal error: nix is unable to build packages
/data/data/com.termux/files/home/.nix-portable/nix/store/1kykyij2ajl0yf5cjq764nzjpama17kj-nix-2.20.6/bin/nix: error while loading shared libraries: /nix/store/17f0lq1gmx0zmzqnhal6sj33zy0n1i21-glibc-2.37-45/lib/libc.so: invalid ELF header
./nix-portable: line 1: /tmp/np_env: No such file or directory

As far as I can tell the only important part is:

/nix/store/17f0lq1gmx0zmzqnhal6sj33zy0n1i21-glibc-2.37-45/lib/libc.so: invalid ELF header

And I have no idea how to fix that.

Where I'm At Now

I assume this either has to do with the pathsTopLevel variable and/or something necessary not being compiled for the bionic c compiler Android uses. I'll keep trying to figure out what I need to do, but if anyone has any ideas or documentation I should be looking through, please let me know. 👍