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μget

Simple utility to help CI guys do their job in constrained environments to download and run binaries in /tmp. Size of μget is around 4Kb.

Features

  • Could be used as curl or wget replacement. In my case it's convenient to PUT binary to S3 bucket and then run it on device

  • Supports only HTTP (we need deal with size), no redirects yet

  • No fancy error messages inside binary, returns only exit codes from defined preset (see Error codes section).

Usage

  • As curl replacement: uget ifconfig.me

  • Ad-hoc utility to download and run binary:

$ ./uget run openipc.s3-eu-west-1.amazonaws.com/ipc_chip_info

Transferring to device using telnet

# on your Linux workstation
$ ./bin2sh uget > uget.sh
# login via telnet to embedded device, copy-paste text from uget.sh
# target binary will reside in /tmp
$ ./uget example.com

# if target system doesn't support printf use
$ ./bin2sh -echo uget > uget.sh

Demo

asciicast

Error codes

Error code Description
0 everything is ok
1 general error code
2 socket creation error
3 DNS resolution error
4 connection error
5 send error
6 incorrect command line options
  • HTTP response codes other than 2XX are transformed from XYZ number to XZ exit code (so 44 means 404, or 52 means 502)