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aermu.c

/*
 *    aegis - project change supervisor
 *    Copyright (C) 1991-1999, 2001, 2002 Peter Miller;
 *    All rights reserved.
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to implement remove file undo
 */

#include <ac/stdio.h>
#include <ac/stdlib.h>

#include <ael/change/files.h>
#include <aermu.h>
#include <arglex2.h>
#include <change/branch.h>
#include <change/file.h>
#include <commit.h>
#include <error.h>
#include <help.h>
#include <lock.h>
#include <log.h>
#include <os.h>
#include <progname.h>
#include <project.h>
#include <project/file.h>
#include <sub.h>
#include <trace.h>
#include <user.h>
#include <str_list.h>


/*
 * NAME
 *    remove_file_undo_usage
 *
 * SYNOPSIS
 *    void remove_file_undo_usage(void);
 *
 * DESCRIPTION
 *    The remove_file_undo_usage function is used to
 *    tell the user how to use the 'aegis -ReMove_file_Undo' command.
 */

static void
remove_file_undo_usage(void)
{
    char        *progname;

    progname = progname_get();
    fprintf
    (
      stderr,
      "usage: %s -ReMove_file_Undo <filename>... [ <option>... ]\n",
      progname
    );
    fprintf
    (
      stderr,
      "       %s -ReMove_file_Undo -List [ <option>... ]\n",
      progname
    );
    fprintf(stderr, "       %s -ReMove_file_Undo -Help\n", progname);
    quit(1);
}


/*
 * NAME
 *    remove_file_undo_help
 *
 * SYNOPSIS
 *    void remove_file_undo_help(void);
 *
 * DESCRIPTION
 *    The remove_file_undo_help function is used to
 *    describe the 'aegis -ReMove_file_undo' command to the user.
 */

static void
remove_file_undo_help(void)
{
    help("aermu", remove_file_undo_usage);
}


/*
 * NAME
 *    remove_file_undo_list
 *
 * SYNOPSIS
 *    void remove_file_undo_list(void);
 *
 * DESCRIPTION
 *    The remove_file_undo_list function is used to
 *    list the file the user may wish to remove from the change
 *    as a deletion.    All relevant change files are listed.
 */

static void
remove_file_undo_list(void)
{
    string_ty         *project_name;
    long        change_number;

    trace(("remove_file_undo_list()\n{\n"));
    project_name = 0;
    change_number = 0;
    arglex();
    while (arglex_token != arglex_token_eoln)
    {
      switch (arglex_token)
      {
      default:
          generic_argument(remove_file_undo_usage);
          continue;

      case arglex_token_change:
          if (arglex() != arglex_token_number)
          {
            option_needs_number
            (
                arglex_token_change,
                remove_file_undo_usage
            );
          }
          /* fall through... */

      case arglex_token_number:
          if (change_number)
          {
            duplicate_option_by_name
            (
                arglex_token_change,
                remove_file_undo_usage
            );
          }
          change_number = arglex_value.alv_number;
          if (change_number == 0)
            change_number = MAGIC_ZERO;
          else if (change_number < 1)
          {
            sub_context_ty    *scp;

            scp = sub_context_new();
            sub_var_set_long(scp, "Number", change_number);
            fatal_intl(scp, i18n("change $number out of range"));
            /* NOTREACHED */
            sub_context_delete(scp);
          }
          break;

      case arglex_token_project:
          if (arglex() != arglex_token_string)
            option_needs_name(arglex_token_project, remove_file_undo_usage);
          if (project_name)
          {
            duplicate_option_by_name
            (
                arglex_token_project,
                remove_file_undo_usage
            );
          }
          project_name = str_from_c(arglex_value.alv_string);
          break;
      }
      arglex();
    }
    list_change_files(project_name, change_number);
    if (project_name)
      str_free(project_name);
    trace(("}\n"));
}


/*
 * NAME
 *    remove_undo_main
 *
 * SYNOPSIS
 *    void remove_undo_main(void);
 *
 * DESCRIPTION
 *    The remove_undo_main function is used to
 *    remove a file from a change as a deletion.
 *
 *    The names of the relevant files are gleaned from the command line.
 */

static void
remove_file_undo_main(void)
{
    string_list_ty  wl;
    string_list_ty  wl2;
    string_ty         *s1;
    string_ty         *s2;
    size_t      j;
    size_t      k;
    cstate      cstate_data;
    string_ty         *project_name;
    project_ty        *pp;
    long        change_number;
    change_ty         *cp;
    log_style_ty    log_style;
    user_ty     *up;
    string_ty         *dd;
    int               number_of_errors;
    string_list_ty  search_path;
    int               mend_symlinks;
    pconf       pconf_data;
    int               based;
    string_ty         *base;

    trace(("remove_file_undo_main()\n{\n"));
    arglex();
    project_name = 0;
    change_number = 0;
    string_list_constructor(&wl);
    log_style = log_style_append_default;
    while (arglex_token != arglex_token_eoln)
    {
      switch (arglex_token)
      {
      default:
          generic_argument(remove_file_undo_usage);
          continue;

      case arglex_token_file:
      case arglex_token_directory:
          if (arglex() != arglex_token_string)
            remove_file_undo_usage();
          /* fall through... */

      case arglex_token_string:
          s2 = str_from_c(arglex_value.alv_string);
          string_list_append(&wl, s2);
          str_free(s2);
          break;

      case arglex_token_change:
          if (arglex() != arglex_token_number)
          {
            option_needs_number
            (
                arglex_token_change,
                remove_file_undo_usage
            );
          }
          /* fall through... */

      case arglex_token_number:
          if (change_number)
          {
            duplicate_option_by_name
            (
                arglex_token_change,
                remove_file_undo_usage
            );
          }
          change_number = arglex_value.alv_number;
          if (change_number == 0)
            change_number = MAGIC_ZERO;
          else if (change_number < 1)
          {
            sub_context_ty    *scp;

            scp = sub_context_new();
            sub_var_set_long(scp, "Number", change_number);
            fatal_intl(scp, i18n("change $number out of range"));
            /* NOTREACHED */
            sub_context_delete(scp);
          }
          break;

      case arglex_token_project:
          if (arglex() != arglex_token_string)
            option_needs_name(arglex_token_project, remove_file_undo_usage);
          if (project_name)
          {
            duplicate_option_by_name
            (
                arglex_token_project,
                remove_file_undo_usage
            );
          }
          project_name = str_from_c(arglex_value.alv_string);
          break;

      case arglex_token_nolog:
          if (log_style == log_style_none)
            duplicate_option(remove_file_undo_usage);
          log_style = log_style_none;
          break;

      case arglex_token_wait:
      case arglex_token_wait_not:
          user_lock_wait_argument(remove_file_undo_usage);
          break;

      case arglex_token_base_relative:
      case arglex_token_current_relative:
          user_relative_filename_preference_argument(remove_file_undo_usage);
          break;
      }
      arglex();
    }
    if (!wl.nstrings)
    {
      error_intl(0, i18n("no file names"));
      remove_file_undo_usage();
    }

    /*
     * locate project data
     */
    if (!project_name)
      project_name = user_default_project();
    pp = project_alloc(project_name);
    str_free(project_name);
    project_bind_existing(pp);

    /*
     * locate user data
     */
    up = user_executing(pp);

    /*
     * locate change data
     */
    if (!change_number)
      change_number = user_default_change(up);
    cp = change_alloc(pp, change_number);
    change_bind_existing(cp);

    /*
     * take the locks and read the change state
     */
    change_cstate_lock_prepare(cp);
    lock_take();
    cstate_data = change_cstate_get(cp);

    log_open(change_logfile_get(cp), up, log_style);

    /*
     * It is an error if the change is not in the in_development state.
     * It is an error if the change is not assigned to the current user.
     */
    if (cstate_data->state != cstate_state_being_developed)
      change_fatal(cp, 0, i18n("bad rmu state"));
    if (change_is_a_branch(cp))
      change_fatal(cp, 0, i18n("bad cp undo branch"));
    if (!str_equal(change_developer_name(cp), user_name(up)))
      change_fatal(cp, 0, i18n("not developer"));

    /*
     * Search path for resolving filenames.
     */
    change_search_path_get(cp, &search_path, 1);

    /*
     * Find the base for relative filenames.
     */
    based =
      (
          search_path.nstrings >= 1
      &&
          (
            user_relative_filename_preference
            (
                up,
                uconf_relative_filename_preference_current
            )
          ==
            uconf_relative_filename_preference_base
          )
      );
    if (based)
      base = search_path.string[0];
    else
    {
      os_become_orig();
      base = os_curdir();
      os_become_undo();
    }

    /*
     * resolve the path of each file
     * 1.   the absolute path of the file name is obtained
     * 2.   if the file is inside the development directory, ok
     * 3.   if the file is inside the baseline, ok
     * 4.   if neither, error
     */
    string_list_constructor(&wl2);
    number_of_errors = 0;
    for (j = 0; j < wl.nstrings; ++j)
    {
      string_list_ty    wl_in;

      s1 = wl.string[j];
      if (s1->str_text[0] == '/')
          s2 = str_copy(s1);
      else
          s2 = str_format("%S/%S", base, s1);
      user_become(up);
      s1 = os_pathname(s2, 1);
      user_become_undo();
      str_free(s2);
      s2 = 0;
      for (k = 0; k < search_path.nstrings; ++k)
      {
          s2 = os_below_dir(search_path.string[k], s1);
          if (s2)
            break;
      }
      str_free(s1);
      if (!s2)
      {
          sub_context_ty  *scp;

          scp = sub_context_new();
          sub_var_set_string(scp, "File_Name", wl.string[j]);
          change_error(cp, scp, i18n("$filename unrelated"));
          sub_context_delete(scp);
          ++number_of_errors;
          continue;
      }
      change_file_directory_query(cp, s2, &wl_in, 0);
      if (wl_in.nstrings)
      {
          int               used;

          /*
           * If the user named a directory, add all of the
           * source files in that directory, provided they
           * are not already in the change.
           */
          used = 0;
          for (k = 0; k < wl_in.nstrings; ++k)
          {
            fstate_src  src_data;
            string_ty   *s3;

            s3 = wl_in.string[k];
            src_data = change_file_find(cp, s3);
            assert(src_data);
            if (src_data && src_data->action == file_action_remove)
            {
                if (string_list_member(&wl2, s3))
                {
                  sub_context_ty    *scp;

                  scp = sub_context_new();
                  sub_var_set_string(scp, "File_Name", s3);
                  change_error(cp, scp, i18n("too many $filename"));
                  sub_context_delete(scp);
                  ++number_of_errors;
                }
                else
                  string_list_append(&wl2, s3);
                ++used;
            }
          }
          if (!used)
          {
            sub_context_ty    *scp;

            scp = sub_context_new();
            if (s2->str_length)
                sub_var_set_string(scp, "File_Name", s2);
            else
                sub_var_set_charstar(scp, "File_Name", ".");
            sub_var_set_long(scp, "Number", (long)wl_in.nstrings);
            sub_var_optional(scp, "Number");
            change_error
            (
                cp,
                scp,
                i18n("directory $filename contains no relevant files")
            );
            sub_context_delete(scp);
            ++number_of_errors;
          }
      }
      else
      {
          if (string_list_member(&wl2, s2))
          {
            sub_context_ty    *scp;

            scp = sub_context_new();
            sub_var_set_string(scp, "File_Name", s2);
            change_error(cp, scp, i18n("too many $filename"));
            sub_context_delete(scp);
            ++number_of_errors;
          }
          else
            string_list_append(&wl2, s2);
      }
      string_list_destructor(&wl_in);
      str_free(s2);
    }
    string_list_destructor(&wl);
    wl = wl2;
    string_list_destructor(&search_path);

    /*
     * ensure that each file is part of the change
     */
    for (j = 0; j < wl.nstrings; ++j)
    {
      fstate_src  c_src_data;

      s1 = wl.string[j];
      c_src_data = change_file_find(cp, s1);
      if (!c_src_data)
      {
          c_src_data = change_file_find_fuzzy(cp, s1);
          if (c_src_data)
          {
            sub_context_ty    *scp;

            scp = sub_context_new();
            sub_var_set_string(scp, "File_Name", s1);
            sub_var_set_string(scp, "Guess", c_src_data->file_name);
            change_error(cp, scp, i18n("no $filename, closest is $guess"));
            sub_context_delete(scp);
          }
          else
          {
            sub_context_ty    *scp;

            scp = sub_context_new();
            sub_var_set_string(scp, "File_Name", s1);
            change_error(cp, scp, i18n("no $filename"));
            sub_context_delete(scp);
          }
          ++number_of_errors;
          continue;
      }
      if (c_src_data->action != file_action_remove)
      {
          sub_context_ty  *scp;

          scp = sub_context_new();
          sub_var_set_string(scp, "File_Name", s1);
          change_error(cp, scp, i18n("bad rm undo $filename"));
          sub_context_delete(scp);
          ++number_of_errors;
          continue;
      }
      change_file_remove(cp, s1);
    }
    if (number_of_errors)
    {
      sub_context_ty    *scp;

      scp = sub_context_new();
      sub_var_set_long(scp, "Number", number_of_errors);
      sub_var_optional(scp, "Number");
      change_fatal(cp, scp, i18n("remove file undo fail"));
      /* NOTREACHED */
      sub_context_delete(scp);
    }

    /*
     * Figure out if we need to mend symlinks as we go.
     */
    pconf_data = change_pconf_get(cp, 0);
    mend_symlinks =
      (
          pconf_data->create_symlinks_before_build
      &&
          !pconf_data->remove_symlinks_after_build
      );

    /*
     * Remove the difference files,
     * and the dummy files,
     * if they exist.
     */
    dd = change_development_directory_get(cp, 0);
    user_become(up);
    for (j = 0; j < wl.nstrings; ++j)
    {
      fstate_src  psrc_data;

      s1 = wl.string[j];
      if (mend_symlinks)
      {
          user_become_undo();
          psrc_data = project_file_find(pp, s1, view_path_extreme);
          user_become(up);
      }
      else
          psrc_data = 0;

      s2 = str_format("%S/%S", dd, s1);
      if (psrc_data)
      {
          string_ty         *blf;

          /*
           * This is not as robust in the face of errors
           * as using commit.  Its merit is its simplicity.
           *
           * Also, the rename-and-delete shenanigans take
           * a long time over NFS, and users expect this
           * to be fast.
           */
          user_become_undo();
          blf = project_file_path(pp, s1);
          assert(blf);
          user_become(up);
          if (os_exists(s2))
            os_unlink(s2);
          os_symlink(blf, s2);
          str_free(blf);
      }
      else
      {
          if (os_exists(s2))
            commit_unlink_errok(s2);
      }
      str_free(s2);

      s2 = str_format("%S/%S,D", dd, s1);
      if (os_exists(s2))
          commit_unlink_errok(s2);
      str_free(s2);

      s2 = str_format("%S/%S,B", dd, s1);
      if (os_exists(s2))
          commit_unlink_errok(s2);
      str_free(s2);
    }
    user_become_undo();

    /*
     * the number of files changed, or the version did,
     * so stomp on the validation fields.
     */
    change_build_times_clear(cp);

    /*
     * run the change file command
     * and the project file command if necessary
     */
    change_run_remove_file_undo_command(cp, &wl, up);
    change_run_project_file_command(cp, up);

    /*
     * write the data and release the lock
     */
    change_cstate_write(cp);
    commit();
    lock_release();

    /*
     * verbose success message
     */
    for (j = 0; j < wl.nstrings; ++j)
    {
      sub_context_ty    *scp;

      scp = sub_context_new();
      sub_var_set_string(scp, "File_Name", wl.string[j]);
      change_verbose(cp, scp, i18n("remove file undo $filename complete"));
      sub_context_delete(scp);
    }
    string_list_destructor(&wl);
    change_free(cp);
    project_free(pp);
    user_free(up);
    trace(("}\n"));
}


/*
 * NAME
 *    remove_file_undo
 *
 * SYNOPSIS
 *    void remove_file_undo(void);
 *
 * DESCRIPTION
 *    The remove_file_undo function is used to
 *    dispatch the 'aegis -ReMove_file_Undo' command to the relevant
 *    function to do it's work.
 */

void
remove_file_undo(void)
{
    static arglex_dispatch_ty dispatch[] =
    {
      {arglex_token_help, remove_file_undo_help, },
      {arglex_token_list, remove_file_undo_list, },
    };

    trace(("remove_file_undo()\n{\n"));
    arglex_dispatch(dispatch, SIZEOF(dispatch), remove_file_undo_main);
    trace(("}\n"));
}

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