Little helper to create tar balls of an executable together with its ELF shared library dependencies.

Little helper to create tar balls of an executable together with its ELF shared library dependencies. This is useful for prototyping with gokrazy: https://gokrazy.org/prototyping/

Installation

go install github.com/gokrazy/freeze/cmd/...@latest

Usage

Let’s assume you want to try the upcoming Linux ksmbd feature.

On Linux, build ksmbd-tools:

$ git clone https://github.com/cifsd-team/ksmbd-tools
$ cd ksmbd-tools
$ ./autogen.sh
$ ./configure 
$ make -j8
$ freeze control/ksmbd.control
[…]
2021/10/24 15:29:33 Download freeze1373262977.tar to your gokrazy device and run:
	LD_LIBRARY_PATH=$PWD ./ld-linux-x86-64.so.2 ./ksmbd.control

Then, on your gokrazy device, e.g. via breakglass:

$ cd /tmp
$ wget http://10.0.0.76:4080/freeze1373262977.tar
$ tar xf freeze1373262977.tar 
$ cd freeze1373262977/
$ LD_LIBRARY_PATH=$PWD ./ld-linux-x86-64.so.2 ./ksmbd.control
Usage: ksmbd.control
	-s | --shutdown
	-d | --debug=all or [smb, auth, etc...]
	-c | --ksmbd-version
	-V | --version
Owner
null
https://github.com/gokrazy/freeze
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Comments
  • [comment] same need, same solution

    [comment] same need, same solution

    I came across the same need when packaging a python application into a standalone folder.

    I used the same trick : embed libs given by ldd with the exe into a tarball. Work pretty well.

    Since I'm more a shell guy than a go guy, I used the following:

    # cd into dist folder
ldd $1       |  # list shared libs
  awk '$2 == "=>" { print $3 }' |  # format ldd output
  sort -u    |  # remove duplicated
  tar c -T - |  # tar from file list from stdin
  tar x         # untar in current folder
  • support cross compilation

    support cross compilation

    The tc example on https://gokrazy.org/prototyping/ uses cross compilation.

    freeze should work out of the box with binaries that are not for the host architecture.

  • Refactor the way dependencies are foudn?

    Refactor the way dependencies are foudn?

    There are a couple of issues with the FindShLibs() function:

    • Some executables like /usr/sbin/nft b0rk at no arguments passed and exit with an exit status of 1. I kid you not 🤦‍♂️ Whoever designed the nft tool this way, shame 😅
    • Furthermore, I found that the LD_TRACE_LOADED_OBJECTS=1 seems to be a GNU LIBC thing only? This does not work on Alpine for example which uses musl? (I could be wrong) but I wasn't able to use freeze on Alpine.
  • libresolv / libnss are not frozen (for iperf3, or wget)

    libresolv / libnss are not frozen (for iperf3, or wget)

    When name resolution (via getaddrinfo) is broken due to lack of libnss*.so and libresolv*.so, iperf3 fails to start with an opaque error message (iperf3: error - unable to send control message: Bad file descriptor).

    Looks like libnss_dns* and libresolv* are the minimum files we need for name resolution to work.

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