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Rework infosys startup scripts to be more robust under systemd (BUGZ-3835)

Andrii Salnikov requested to merge andrii/arc:infosys-systemd-units-improvements into master

Fixes to accommodate both "custom pidfile in arc.conf" and to ensure correct systemd behavior taking into account double forking with delays in third-party bdii-update (BUGZ-3835):

  • Workaround slow bdii-update forking sequence with ExecStartPost checks (like it was in in the scripts before)
  • Ensure MAINPID with hardcoded PIDFile location (returned back behavior), BUT:
    • Path is only hardcoded in systemd unit itself. This hardcoded path accessible to bash-scripts as environmental variable and used additionally to arc.conf valued.
    • If custom PIDFiles are defined in arc.conf, the pidfile in 'hardcoded PIDFile location' will be copied to custom location during ExecStartPost
Edited by Maiken

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