aegis -Develop_Begin(1)     General Commands Manual    aegis -Develop_Begin(1)

        aegis develop begin - begin development of a change

        aegis -Develop_Begin change‐number [ option...  ]
        aegis -Develop_Begin -List [ option...  ]
        aegis -Develop_Begin -Help

        The aegis -Develop_Begin command is used to commence development of a

        The development directory for the change will be created
        automatically; below the directory specified in the default_‐
        development_directory field of aeuconf(5), or if not set below the
        directory specified in the default_development_directory field of
        aepattr(5), or if not set below the current user's home directory.  It
        is rare to need to know the exact pathname of the development
        directory, as the aecd(1) command can take you there at any time.

        Successful execution of this command will move the specified change
        from the awaiting development state to the being developed state.
              ├┤awaiting │
         develop    │develop
         begin      ┬begin
         undo  ┌────┴────┐
               │  being  │

        The develop_begin_command in the project configuration file (see
        aepconf(5) for more information) will be run, if specified.  This is
        run after the aegis locks are released, so additional aegis commands
        may be run from here, if used with care.  The symbolic links (see
        below) have not yet been created.

   Development Directory Location
        Please Note: Aegis also consults the underlying file system, to
        determine its notion of maximum file size.  Where the file system's
        maximum file size is less than maximum_filename_length, the filesystem
        wins.  This can happen, for example, when you are using the Linux
        UMSDOS file system, or when you have an NFS mounted an ancient V7
        filesystem.  Setting maximum_filename_length to 255 in these cases
        does not alter the fact that the underlying file systems limits are
        far smaller (12 and 14, respectively).

        If your development directories (or your whole project) is on
        filesystems with filename limitations, or a portion of the
        heterogeneous builds take place in such an environment, it helps to
        tell Aegis what they are (using the project config file's fields) so
        that you don't run into the situation where the project builds on the
        more permissive environments, but fails with mysterious errors in the
        more limited environments.

        If your development directories are routinely on a Linux UMSDOS
        filesystem, you would probably be better off setting
        dos_filename_required = true, and also changing the
        development_directory_template field.  Heterogeneous development with
        various Windows environments may also require this.

        It is possible for project administrators to use the -User option to
        force a developer to start developing a change.  Some sites prefer to
        work this way.  Note that developers still have the ability to use the
        aedbu(1) command.

        Warning: capricious use of this command will rapidly alienate
        developers.  The defaulting rules, particularly for the change number,
        depend on aegis and the developer agreeing on what the developer is
        currently working on.

        The forced_develop_begin_notify_command project attribute (see
        aepattr(5) for more information) will be run when an administrator
        uses the -User option, in an attempt to minimize the surprises for
        developers.  A suitable command is
                forced_develop_begin_notify_command =
                    "$datadir/ $p $c $developer";
        This command will send e‐mail to the developer, informing her that the
        change has been assigned to her.

        Many dependency maintenance tools, and indeed some compilers, have
        little or no support for include file search paths, and thus for the
        concept of the two‐level directory hierarchy employed by Aegis.  (It
        becomes multi‐level when Aegis' branching functionality is used.)  To
        allow these tools to be used, Aegis provides the ability to maintain a
        set of symbolic links between the development directory of a change
        and the baseline of a project, so it appears to these tools that all
        of the project's files are present in the development directory.

   Project Configuration
        The development_directory_style field of the project configuration
        file controls the appearance of the development directory.  See
        aepconf(5) for more information.

        By using a setting such as
                development_directory_style =
                    source_file_symlink = true;
                    during_build_only = true;
        the user never sees the symbolic links, because they are added purely
        for the benefit of the dependency maintenance tool during the
        execution of the aeb(1) command.

        By using a setting such as
                development_directory_style =
                    source_file_symlink = true;
        (the other will default to false) the symbolic links will be created
        at develop begin time (see aedb(1) for more information) and also
        maintained by each aeb(1) invocation.  Note that the symbolic links
        are only maintained at these times, so project integrations during the
        course of editing change sourec files may leave the symbolic links in
        an inconsistent state until the next build.

        When files are copied from the baseline into a change, using the
        aecp(1) command, the symbolic link pointing into the baseline, if any,
        will be removed before the file is copied.

        Note: Using this functionality in either form has implications for how
        the rules file of the dependency maintenance tool is written.  Rules
        must remove their targets before creating them (usually with an rm -f
        command) if you use any of the link sub‐fields (both hard links and
        symbolic links).  This is to avoid attempting to write the result on
        the symbolic link, which will point at a read‐only file in the project
        baseline.  This is similar to the same requirement for using the
        link_integration_directory field of the project configuration file.

   User Configuration
        There is a symbolic_link_preference field in the user configuration
        file (see aeuconf(5) for more information).  This controls whether
        aeb(1) will verify the symbolic links before the build (default) or
        whether it will assume they are up‐to‐date.  (This field is only
        relevant if development_directory__style.source_file_symlink is true.)

        For medium‐to‐large projects, verifying the symbolic links can take as
        long as the build itself.  Assuming the symbolic links are up‐to‐date
        can be a large time‐saving for these projects.  It may be advisable to
        review your choice of DMT in such a situation.

        The aedb(1) command does not consult this preference.  Thus, in most
        situations, the symbolic links will be up‐to‐date when the build is
        performed.  The only Aegis function which may result in the symbolic
        links becoming out‐of‐date is the integration of another change, as
        this may alter the presence or absence of files in the baseline.  In
        this situation, the default aeb(1) action is to ignore the user
        preference and the verify symbolic links.

        There are two command line options which modify aeb(1) behavior
        further: the -Verify‐Symbolic‐Links option says to verify the symbolic
        links; and the -Assume‐Symbolic‐Links option says to assume the
        symbolic links are up‐to‐date.  In each case the option over‐rides the
        default and the user preference.

        It is possible to obtain behaviour similar to Tom Lord'a Arch by using
        a setting such as:
                development_directory_style =
                    source_file_link = true;
                    source_file_symlink = true;

        It is possible to obtain behaviour similar to CVS by using a setting
        such as:
                development_directory_style =
                    source_file_copy = true;
        There are many more possible configurations of the development_‐
        directory_style, usually with helpful build side‐effects.  See
        aepconf(1) and the Depenedency Maintenance Tool chapter of the User
        Guide for more information.

        The symbolic link command line options and preferences apply equally
        to hard links and file copies (the names have historical origins).

        The following options are understood:

        -Change number
                This option may be used to specify a particular change within
                a project.  See aegis(1) for a complete description of this

        -DIRectory path
                This option may be used to specify which directory is to be
                used.  It is an error if the current user does not have
                appropriate permissions to create the directory path given.
                This must be an absolute path.

                Caution: If you are using an automounter do not use `pwd` to
                make an absolute path, it usually gives the wrong answer.

                This option may be used to obtain more information about how
                to use the aegis program.

                This option may be used to obtain a list of suitable subjects
                for this command.  The list may be more general than expected.

        -Project name
                This option may be used to select the project of interest.
                When no -Project option is specified, the AEGIS_PROJECT
                environment variable is consulted.  If that does not exist,
                the user's $HOME/.aegisrc file is examined for a default
                project field (see aeuconf(5) for more information).  If that
                does not exist, when the user is only working on changes
                within a single project, the project name defaults to that
                project.  Otherwise, it is an error.

        -REAson text
                This option may be used to attach a comment to the change
                history generated by this command.  You will need to use
                quotes to insulate the spaces from the shell.

                This option may be used to cause listings to produce the bare
                minimum of information.  It is usually useful for shell

        -User name
                This option is used to specify the user who is to develop the
                change.  This option may only be used by a project

                This option may be used to cause aegis to produce more output.
                By default aegis only produces output on errors.  When used
                with the -List option this option causes column headings to be

        -Wait   This option may be used to require Aegis commands to wait for
                access locks, if they cannot be obtained immediately.
                Defaults to the user's lock_wait_preference if not specified,
                see aeuconf(5) for more information.

                This option may be used to require Aegis commands to emit a
                fatal error if access locks cannot be obtained immediately.
                Defaults to the user's lock_wait_preference if not specified,
                see aeuconf(5) for more information.

        See also aegis(1) for options common to all aegis commands.

        All options may be abbreviated; the abbreviation is documented as the
        upper case letters, all lower case letters and underscores (_) are
        optional.  You must use consecutive sequences of optional letters.

        All options are case insensitive, you may type them in upper case or
        lower case or a combination of both, case is not important.

        For example: the arguments “-project”, “-PROJ” and “-p” are all
        interpreted to mean the -Project option.  The argument “-prj” will not
        be understood, because consecutive optional characters were not

        Options and other command line arguments may be mixed arbitrarily on
        the command line, after the function selectors.

        The GNU long option names are understood.  Since all option names for
        aegis are long, this means ignoring the extra leading '-'.  The
        “--option=value” convention is also understood.

        The recommended alias for this command is
        csh%    alias aedb 'aegis -db \!* -v'
        sh$     aedb(){aegis -db "$@" -v}

        It is an error if the change does not exist.
        It is an error if the change is not in the awaiting development state.
        It is an error if the current user is not a developer of the specified

        The aegis command will exit with a status of 1 on any error.  The
        aegis command will only exit with a status of 0 if there are no

        See aegis(1) for a list of environment variables which may affect this
        command.  See aepconf(5) for the project configuration file's
        project_specific field for how to set environment variables for all
        commands executed by Aegis.

        aeb(1)  build a change

        aecd(1) change directory

        aecp(1) copy files into a change

        aed(1)  find differences between a change and the baseline

                undo the effects of aedb

        aede(1) complete development of a change

        aemv(1) rename a file as part of a change

        aenc(1) add a new change to a project

        aend(1) add a new developer to a project

        aenf(1) add new files to a change

        aent(1) add a new test to a change

        aepa(1) modify the attributes of a project

        aerm(1) add files to be deleted to a change

        aet(1)  run tests

                project attributes file format

                user configuration file format

        aegis version 4.25.D510
        Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
        2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
        2011, 2012 Peter Miller

        The aegis program comes with ABSOLUTELY NO WARRANTY; for details use
        the 'aegis -VERSion License' command.  This is free software and you
        are welcome to redistribute it under certain conditions; for details
        use the 'aegis -VERSion License' command.

        Peter Miller   E‐Mail:
        /\/\*             WWW:

Reference Manual                     Aegis             aegis -Develop_Begin(1)