Arch Linux

Description:

xpra requires the which command, which is provided by which. Without which, xpra sessions cannot start:

2022-02-17 21:44:26,337 will try to run xpra from: ['xpra', '$XDG_RUNTIME_DIR/xpra/run-xpra', '/usr/local/bin/xpra', '~/.xpra/run-xpra', 'Xpra_cmd.exe']
2022-02-17 21:44:26,337 paramiko_run_test_command(transport, 'which xpra')
2022-02-17 21:44:26,951 exec_command returned
2022-02-17 21:44:26,951 exit status is not ready yet, sleeping
2022-02-17 21:44:26,962 exec_command('which xpra')=127
2022-02-17 21:44:26,962 exec_command out=''
2022-02-17 21:44:26,963 exec_command err='bash: line 1: which: command not found\n'
2022-02-17 21:44:26,963 paramiko_run_test_command(transport, 'which $XDG_RUNTIME_DIR/xpra/run-xpra')
2022-02-17 21:44:26,977 exec_command returned
2022-02-17 21:44:26,977 exit status is not ready yet, sleeping
2022-02-17 21:44:26,987 exit status is not ready yet, sleeping
2022-02-17 21:44:26,998 exec_command('which $XDG_RUNTIME_DIR/xpra/run-xpra')=127
2022-02-17 21:44:26,999 exec_command out=''
2022-02-17 21:44:26,999 exec_command err='bash: line 1: which: command not found\n'
2022-02-17 21:44:26,999 paramiko_run_test_command(transport, 'which /usr/local/bin/xpra')
2022-02-17 21:44:27,047 exec_command returned
2022-02-17 21:44:27,048 exit status is not ready yet, sleeping
2022-02-17 21:44:27,058 exit status is not ready yet, sleeping
2022-02-17 21:44:27,068 exec_command('which /usr/local/bin/xpra')=127
2022-02-17 21:44:27,069 exec_command out=''
2022-02-17 21:44:27,069 exec_command err='bash: line 1: which: command not found\n'
2022-02-17 21:44:27,069 paramiko_run_test_command(transport, 'which ~/.xpra/run-xpra')
2022-02-17 21:44:27,082 exec_command returned
2022-02-17 21:44:27,082 exit status is not ready yet, sleeping
2022-02-17 21:44:27,093 exec_command('which ~/.xpra/run-xpra')=127
2022-02-17 21:44:27,093 exec_command out=''
2022-02-17 21:44:27,093 exec_command err='bash: line 1: which: command not found\n'
2022-02-17 21:44:27,094 paramiko_run_test_command(transport, 'ver')
2022-02-17 21:44:27,150 exec_command returned
2022-02-17 21:44:27,150 exit status is not ready yet, sleeping
2022-02-17 21:44:27,160 exit status is not ready yet, sleeping
2022-02-17 21:44:27,171 exit status is not ready yet, sleeping
2022-02-17 21:44:27,182 exec_command('ver')=127
2022-02-17 21:44:27,182 exec_command out=''
2022-02-17 21:44:27,183 exec_command err='bash: line 1: ver: command not found\n'

This is with xpra 4.2.3-3.

Marking as critical because xpra does not run without this dependency installed.

Steps to reproduce:
1. Uninstall which on the remote, if installed.
2. Attempt to connect to a remote xpra server (-d ssh enabled for debugging):
xpra start ssh:user@host -d ssh --exit-with-children --start-child=xterm