Module: OsCtl::Lib::Utils::System
- Includes:
- Timeout
- Included in:
- Exporter::Tar, Exporter::Zfs, Zfs::Dataset, Zfs::PropertyReader, Zfs::PropertyState, Zfs::Stream, Zfs::ZpoolStatus
- Defined in:
- lib/libosctl/utils/system.rb
Instance Method Summary collapse
-
#repeat_on_failure(attempts: 3, wait: 5) { ... } ⇒ true, ...
Attempt to run a block several times.
- #syscmd(cmd, opts = {}) ⇒ SystemCommandResult
- #zfs(cmd, opts, component, cmd_opts = {}) ⇒ SystemCommandResult
Instance Method Details
#repeat_on_failure(attempts: 3, wait: 5) { ... } ⇒ true, ...
Attempt to run a block several times
Given block is run repeatedle until it either succeeds, or the number of attempts has been reached. The block is considered successful if it does not raise any exceptions. #repeat_on_failure makes another attempt at calling the block, if it raises Exceptions::SystemCommandFailed. Any other exception will cause an immediate failure.
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# File 'lib/libosctl/utils/system.rb', line 89 def repeat_on_failure(attempts: 3, wait: 5) ret = [] attempts.times do |i| begin return [true, yield] rescue Exceptions::SystemCommandFailed => err log(:warn, "Attempt #{i+1} of #{attempts} failed for '#{err.cmd}'") ret << err break if i == attempts - 1 sleep(wait) end end [false, ret] end |
#syscmd(cmd, opts = {}) ⇒ SystemCommandResult
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# File 'lib/libosctl/utils/system.rb', line 16 def syscmd(cmd, opts = {}) valid_rcs = opts[:valid_rcs] || [] stderr = opts[:stderr].nil? ? true : opts[:stderr] out = "" log(:work, cmd) IO.popen( opts[:env] || ENV, "exec #{cmd} #{stderr ? '2>&1' : '2> /dev/null'}", opts[:input] ? 'r+' : 'r' ) do |io| if opts[:input] io.write(opts[:input]) io.close_write end if opts[:timeout] begin timeout(opts[:timeout]) do out = io.read end rescue Timeout::Error if opts[:on_timeout] opts[:on_timeout].call(io) else Process.kill('TERM', io.pid) raise Exceptions::SystemCommandFailed.new(cmd, 1, '') end end else out = io.read end end if $?.exitstatus != 0 && (valid_rcs != :all && !valid_rcs.include?($?.exitstatus)) raise Exceptions::SystemCommandFailed.new(cmd, $?.exitstatus, out) end SystemCommandResult.new($?.exitstatus, out) end |
#zfs(cmd, opts, component, cmd_opts = {}) ⇒ SystemCommandResult
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# File 'lib/libosctl/utils/system.rb', line 72 def zfs(cmd, opts, component, cmd_opts = {}) syscmd("zfs #{cmd} #{opts} #{component}", cmd_opts) end |