upstream/mercurial-mirror Files · rust/rhg/src/commands/debugrequirements.rs

tracked-key: remove the dual write and rename to tracked-hint...

tracked-key: remove the dual write and rename to tracked-hint The dual-write approach was mostly useless. As explained in the previous version of the help, the key had to be read twice before we could cache a value. However this "read twice" limitation actually also apply to any usage of the key. If some operation wants to rely of the "same value == same tracked set" property it would need to read the value before, and after running that operation (or at least, after, in all cases). So it cannot be sure the operation it did is "valid" until checking the key after the operation. As a resultat such operation can only be read-only or rollbackable. This reduce the utility of the "same value == same tracked set" a lot. So it seems simpler to drop the double write and to update the documentation to highlight that this file does not garantee race-free operation. As a result the "key" is demoted to a "hint". Documentation is updated accordingly. Differential Revision: https://phab.mercurial-scm.org/D12201

Simon Sapin - - Load All Authors

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             debugrequirements.rs
        
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                | application/rls-services+xml
            
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             / rust / rhg / src / commands / debugrequirements.rs
          
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      use crate::error::CommandError;

      pub const HELP_TEXT: &str = "

      Print the current repo requirements.

      ";

      pub fn args() -> clap::App<'static, 'static> {

          clap::SubCommand::with_name("debugrequirements").about(HELP_TEXT)

      }

      pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {

          let repo = invocation.repo?;

          let mut output = String::new();

          let mut requirements: Vec<_> = repo.requirements().iter().collect();

          requirements.sort();

          for req in requirements {

              output.push_str(req);

              output.push('\n');

          }

          invocation.ui.write_stdout(output.as_bytes())?;

          Ok(())

      }

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				use crate::error::CommandError;

				pub const HELP_TEXT: &str = "
				Print the current repo requirements.
				";

				pub fn args() -> clap::App<'static, 'static> {
				clap::SubCommand::with_name("debugrequirements").about(HELP_TEXT)
				}

				pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {
				let repo = invocation.repo?;
				let mut output = String::new();
				let mut requirements: Vec<_> = repo.requirements().iter().collect();
				requirements.sort();
				for req in requirements {
				output.push_str(req);
				output.push('\n');
				}
				invocation.ui.write_stdout(output.as_bytes())?;
				Ok(())
				}