/*

 * GIT - The information manager from hell

 *

 * Copyright (C) Linus Torvalds, 2005

 */

#define USE_THE_INDEX_VARIABLE

#include "builtin.h"

#include "bulk-checkin.h"

#include "config.h"

#include "environment.h"

#include "gettext.h"

#include "hash.h"

#include "hex.h"

#include "lockfile.h"

#include "quote.h"

#include "cache-tree.h"

#include "tree-walk.h"

#include "object-file.h"

#include "refs.h"

#include "resolve-undo.h"

#include "parse-options.h"

#include "pathspec.h"

#include "dir.h"

#include "read-cache.h"

#include "repository.h"

#include "setup.h"

#include "sparse-index.h"

#include "split-index.h"

#include "symlinks.h"

#include "fsmonitor.h"

#include "write-or-die.h"

/*

 * Default to not allowing changes to the list of files. The

 * tool doesn't actually care, but this makes it harder to add

 * files to the revision control by mistake by doing something

 * like "git update-index *" and suddenly having all the object

 * files be revision controlled.

 */

static int allow_add;

static int allow_remove;

static int allow_replace;

static int info_only;

static int force_remove;

static int verbose;

static int mark_valid_only;

static int mark_skip_worktree_only;

static int mark_fsmonitor_only;

static int ignore_skip_worktree_entries;

#define MARK_FLAG 1

#define UNMARK_FLAG 2

static struct strbuf mtime_dir = STRBUF_INIT;

/* Untracked cache mode */

enum uc_mode {

  UC_UNSPECIFIED = -1,

  UC_DISABLE = 0,

  UC_ENABLE,

  UC_TEST,

  UC_FORCE

};

__attribute__((format (printf, 1, 2)))

static void report(const char *fmt, ...)

{

  va_list vp;

  if (!verbose)

    return;

  /*

   * It is possible, though unlikely, that a caller could use the verbose

   * output to synchronize with addition of objects to the object

   * database. The current implementation of ODB transactions leaves

   * objects invisible while a transaction is active, so flush the

   * transaction here before reporting a change made by update-index.

   */

  flush_odb_transaction();

  va_start(vp, fmt);

  vprintf(fmt, vp);

  putchar('\n');

  va_end(vp);

}

static void remove_test_directory(void)

{

  if (mtime_dir.len)

    remove_dir_recursively(&mtime_dir, 0);

}

static const char *get_mtime_path(const char *path)

{

  static struct strbuf sb = STRBUF_INIT;

  strbuf_reset(&sb);

  strbuf_addf(&sb, "%s/%s", mtime_dir.buf, path);

  return sb.buf;

}

static void xmkdir(const char *path)

{

  path = get_mtime_path(path);

  if (mkdir(path, 0700))

    die_errno(_("failed to create directory %s"), path);

}

static int xstat_mtime_dir(struct stat *st)

{

  if (stat(mtime_dir.buf, st))

    die_errno(_("failed to stat %s"), mtime_dir.buf);

  return 0;

}

static int create_file(const char *path)

{

  int fd;

  path = get_mtime_path(path);

  fd = xopen(path, O_CREAT | O_RDWR, 0644);

  return fd;

}

static void xunlink(const char *path)

{

  path = get_mtime_path(path);

  if (unlink(path))

    die_errno(_("failed to delete file %s"), path);

}

static void xrmdir(const char *path)

{

  path = get_mtime_path(path);

  if (rmdir(path))

    die_errno(_("failed to delete directory %s"), path);

}

static void avoid_racy(void)

{

  /*

   * not use if we could usleep(10) if USE_NSEC is defined. The

   * field nsec could be there, but the OS could choose to

   * ignore it?

   */

  sleep(1);

}

static int test_if_untracked_cache_is_supported(void)

{

  struct stat st;

  struct stat_data base;

  int fd, ret = 0;

  char *cwd;

  strbuf_addstr(&mtime_dir, "mtime-test-XXXXXX");

  if (!mkdtemp(mtime_dir.buf))

    die_errno("Could not make temporary directory");

  cwd = xgetcwd();

  fprintf(stderr, _("Testing mtime in '%s' "), cwd);

  free(cwd);

  atexit(remove_test_directory);

  xstat_mtime_dir(&st);

  fill_stat_data(&base, &st);

  fputc('.', stderr);

  avoid_racy();

  fd = create_file("newfile");

  xstat_mtime_dir(&st);

  if (!match_stat_data(&base, &st)) {

    close(fd);

    fputc('\n', stderr);

    fprintf_ln(stderr,_("directory stat info does not "

            "change after adding a new file"));

    goto done;

  }

  fill_stat_data(&base, &st);

  fputc('.', stderr);

  avoid_racy();

  xmkdir("new-dir");

  xstat_mtime_dir(&st);

  if (!match_stat_data(&base, &st)) {

    close(fd);

    fputc('\n', stderr);

    fprintf_ln(stderr, _("directory stat info does not change "

             "after adding a new directory"));

    goto done;

  }

  fill_stat_data(&base, &st);

  fputc('.', stderr);

  avoid_racy();

  write_or_die(fd, "data", 4);

  close(fd);

  xstat_mtime_dir(&st);

  if (match_stat_data(&base, &st)) {

    fputc('\n', stderr);

    fprintf_ln(stderr, _("directory stat info changes "

             "after updating a file"));

    goto done;

  }

  fputc('.', stderr);

  avoid_racy();

  close(create_file("new-dir/new"));

  xstat_mtime_dir(&st);

  if (match_stat_data(&base, &st)) {

    fputc('\n', stderr);

    fprintf_ln(stderr, _("directory stat info changes after "

             "adding a file inside subdirectory"));

    goto done;

  }

  fputc('.', stderr);

  avoid_racy();

  xunlink("newfile");

  xstat_mtime_dir(&st);

  if (!match_stat_data(&base, &st)) {

    fputc('\n', stderr);

    fprintf_ln(stderr, _("directory stat info does not "

             "change after deleting a file"));

    goto done;

  }

  fill_stat_data(&base, &st);

  fputc('.', stderr);

  avoid_racy();

  xunlink("new-dir/new");

  xrmdir("new-dir");

  xstat_mtime_dir(&st);

  if (!match_stat_data(&base, &st)) {

    fputc('\n', stderr);

    fprintf_ln(stderr, _("directory stat info does not "

             "change after deleting a directory"));

    goto done;

  }

  if (rmdir(mtime_dir.buf))

    die_errno(_("failed to delete directory %s"), mtime_dir.buf);

  fprintf_ln(stderr, _(" OK"));

  ret = 1;

done:

  strbuf_release(&mtime_dir);

  return ret;

}

static int mark_ce_flags(const char *path, int flag, int mark)

{

  int namelen = strlen(path);

  int pos = index_name_pos(&the_index, path, namelen);

  if (0 <= pos) {

    mark_fsmonitor_invalid(&the_index, the_index.cache[pos]);

    if (mark)

      the_index.cache[pos]->ce_flags |= flag;

    else

      the_index.cache[pos]->ce_flags &= ~flag;

    the_index.cache[pos]->ce_flags |= CE_UPDATE_IN_BASE;

    cache_tree_invalidate_path(&the_index, path);

    the_index.cache_changed |= CE_ENTRY_CHANGED;

    return 0;

  }

  return -1;

}

static int remove_one_path(const char *path)

{

  if (!allow_remove)

    return error("%s: does not exist and --remove not passed", path);

  if (remove_file_from_index(&the_index, path))

    return error("%s: cannot remove from the index", path);

  return 0;

}

/*

 * Handle a path that couldn't be lstat'ed. It's either:

 *  - missing file (ENOENT or ENOTDIR). That's ok if we're

 *    supposed to be removing it and the removal actually

 *    succeeds.

 *  - permission error. That's never ok.

 */

static int process_lstat_error(const char *path, int err)

{

  if (is_missing_file_error(err))

    return remove_one_path(path);

  return error("lstat(\"%s\"): %s", path, strerror(err));

}

static int add_one_path(const struct cache_entry *old, const char *path, int len, struct stat *st)

{

  int option;

  struct cache_entry *ce;

  /* Was the old index entry already up-to-date? */

  if (old && !ce_stage(old) && !ie_match_stat(&the_index, old, st, 0))

    return 0;

  ce = make_empty_cache_entry(&the_index, len);

  memcpy(ce->name, path, len);

  ce->ce_flags = create_ce_flags(0);

  ce->ce_namelen = len;

  fill_stat_cache_info(&the_index, ce, st);

  ce->ce_mode = ce_mode_from_stat(old, st->st_mode);

  if (index_path(&the_index, &ce->oid, path, st,

           info_only ? 0 : HASH_WRITE_OBJECT)) {

    discard_cache_entry(ce);

    return -1;

  }

  option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;

  option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;

  if (add_index_entry(&the_index, ce, option)) {

    discard_cache_entry(ce);

    return error("%s: cannot add to the index - missing --add option?", path);

  }

  return 0;

}

/*

 * Handle a path that was a directory. Four cases:

 *

 *  - it's already a gitlink in the index, and we keep it that

 *    way, and update it if we can (if we cannot find the HEAD,

 *    we're going to keep it unchanged in the index!)

 *

 *  - it's a *file* in the index, in which case it should be

 *    removed as a file if removal is allowed, since it doesn't

 *    exist as such any more. If removal isn't allowed, it's

 *    an error.

 *

 *    (NOTE! This is old and arguably fairly strange behaviour.

 *    We might want to make this an error unconditionally, and

 *    use "--force-remove" if you actually want to force removal).

 *

 *  - it used to exist as a subdirectory (ie multiple files with

 *    this particular prefix) in the index, in which case it's wrong

 *    to try to update it as a directory.

 *

 *  - it doesn't exist at all in the index, but it is a valid

 *    git directory, and it should be *added* as a gitlink.

 */

static int process_directory(const char *path, int len, struct stat *st)

{

  struct object_id oid;

  int pos = index_name_pos(&the_index, path, len);

  /* Exact match: file or existing gitlink */

  if (pos >= 0) {

    const struct cache_entry *ce = the_index.cache[pos];

    if (S_ISGITLINK(ce->ce_mode)) {

      /* Do nothing to the index if there is no HEAD! */

      if (resolve_gitlink_ref(path, "HEAD", &oid) < 0)

        return 0;

      return add_one_path(ce, path, len, st);

    }

    /* Should this be an unconditional error? */

    return remove_one_path(path);

  }

  /* Inexact match: is there perhaps a subdirectory match? */

  pos = -pos-1;

  while (pos < the_index.cache_nr) {

    const struct cache_entry *ce = the_index.cache[pos++];

    if (strncmp(ce->name, path, len))

      break;

    if (ce->name[len] > '/')

      break;

    if (ce->name[len] < '/')

      continue;

    /* Subdirectory match - error out */

    return error("%s: is a directory - add individual files instead", path);

  }

  /* No match - should we add it as a gitlink? */

  if (!resolve_gitlink_ref(path, "HEAD", &oid))

    return add_one_path(NULL, path, len, st);

  /* Error out. */

  return error("%s: is a directory - add files inside instead", path);

}

static int process_path(const char *path, struct stat *st, int stat_errno)

{

  int pos, len;

  const struct cache_entry *ce;

  len = strlen(path);

  if (has_symlink_leading_path(path, len))

    return error("'%s' is beyond a symbolic link", path);

  pos = index_name_pos(&the_index, path, len);

  ce = pos < 0 ? NULL : the_index.cache[pos];

  if (ce && ce_skip_worktree(ce)) {

    /*

     * working directory version is assumed "good"

     * so updating it does not make sense.

     * On the other hand, removing it from index should work

     */

    if (!ignore_skip_worktree_entries && allow_remove &&

        remove_file_from_index(&the_index, path))

      return error("%s: cannot remove from the index", path);

    return 0;

  }

  /*

   * First things first: get the stat information, to decide

   * what to do about the pathname!

   */

  if (stat_errno)

    return process_lstat_error(path, stat_errno);

  if (S_ISDIR(st->st_mode))

    return process_directory(path, len, st);

  return add_one_path(ce, path, len, st);

}

static int add_cacheinfo(unsigned int mode, const struct object_id *oid,

       const char *path, int stage)

{

  int len, option;

  struct cache_entry *ce;

  if (!verify_path(path, mode))

    return error("Invalid path '%s'", path);

  len = strlen(path);

  ce = make_empty_cache_entry(&the_index, len);

  oidcpy(&ce->oid, oid);

  memcpy(ce->name, path, len);

  ce->ce_flags = create_ce_flags(stage);

  ce->ce_namelen = len;

  ce->ce_mode = create_ce_mode(mode);

  if (assume_unchanged)

    ce->ce_flags |= CE_VALID;

  option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;

  option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;

  if (add_index_entry(&the_index, ce, option))

    return error("%s: cannot add to the index - missing --add option?",

           path);

  report("add '%s'", path);

  return 0;

}

static void chmod_path(char flip, const char *path)

{

  int pos;

  struct cache_entry *ce;

  pos = index_name_pos(&the_index, path, strlen(path));

  if (pos < 0)

    goto fail;

  ce = the_index.cache[pos];

  if (chmod_index_entry(&the_index, ce, flip) < 0)

    goto fail;

  report("chmod %cx '%s'", flip, path);

  return;

 fail:

  die("git update-index: cannot chmod %cx '%s'", flip, path);

}

static void update_one(const char *path)

{

  int stat_errno = 0;

  struct stat st;

  if (mark_valid_only || mark_skip_worktree_only || force_remove ||

      mark_fsmonitor_only)

    st.st_mode = 0;

  else if (lstat(path, &st) < 0) {

    st.st_mode = 0;

    stat_errno = errno;

  } /* else stat is valid */

  if (!verify_path(path, st.st_mode)) {

    fprintf(stderr, "Ignoring path %s\n", path);

    return;

  }

  if (mark_valid_only) {

    if (mark_ce_flags(path, CE_VALID, mark_valid_only == MARK_FLAG))

      die("Unable to mark file %s", path);

    return;

  }

  if (mark_skip_worktree_only) {

    if (mark_ce_flags(path, CE_SKIP_WORKTREE, mark_skip_worktree_only == MARK_FLAG))

      die("Unable to mark file %s", path);

    return;

  }

  if (mark_fsmonitor_only) {

    if (mark_ce_flags(path, CE_FSMONITOR_VALID, mark_fsmonitor_only == MARK_FLAG))

      die("Unable to mark file %s", path);

    return;

  }

  if (force_remove) {

    if (remove_file_from_index(&the_index, path))

      die("git update-index: unable to remove %s", path);

    report("remove '%s'", path);

    return;

  }

  if (process_path(path, &st, stat_errno))

    die("Unable to process path %s", path);

  report("add '%s'", path);

}

static void read_index_info(int nul_term_line)

{

  const int hexsz = the_hash_algo->hexsz;

  struct strbuf buf = STRBUF_INIT;

  struct strbuf uq = STRBUF_INIT;

  strbuf_getline_fn getline_fn;

  getline_fn = nul_term_line ? strbuf_getline_nul : strbuf_getline_lf;

  while (getline_fn(&buf, stdin) != EOF) {

    char *ptr, *tab;

    char *path_name;

    struct object_id oid;

    unsigned int mode;

    unsigned long ul;

    int stage;

    /* This reads lines formatted in one of three formats:

     *

     * (1) mode         SP sha1          TAB path

     * The first format is what "git apply --index-info"

     * reports, and used to reconstruct a partial tree

     * that is used for phony merge base tree when falling

     * back on 3-way merge.

     *

     * (2) mode SP type SP sha1          TAB path

     * The second format is to stuff "git ls-tree" output

     * into the index file.

     *

     * (3) mode         SP sha1 SP stage TAB path

     * This format is to put higher order stages into the

     * index file and matches "git ls-files --stage" output.

     */

    errno = 0;

    ul = strtoul(buf.buf, &ptr, 8);

    if (ptr == buf.buf || *ptr != ' '

        || errno || (unsigned int) ul != ul)

      goto bad_line;

    mode = ul;

    tab = strchr(ptr, '\t');

    if (!tab || tab - ptr < hexsz + 1)

      goto bad_line;

    if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {

      stage = tab[-1] - '0';

      ptr = tab + 1; /* point at the head of path */

      tab = tab - 2; /* point at tail of sha1 */

    }

    else {

      stage = 0;

      ptr = tab + 1; /* point at the head of path */

    }

    if (get_oid_hex(tab - hexsz, &oid) ||

      tab[-(hexsz + 1)] != ' ')

      goto bad_line;

    path_name = ptr;

    if (!nul_term_line && path_name[0] == '"') {

      strbuf_reset(&uq);

      if (unquote_c_style(&uq, path_name, NULL)) {

        die("git update-index: bad quoting of path name");

      }

      path_name = uq.buf;

    }

    if (!verify_path(path_name, mode)) {

      fprintf(stderr, "Ignoring path %s\n", path_name);

      continue;

    }

    if (!mode) {

      /* mode == 0 means there is no such path -- remove */

      if (remove_file_from_index(&the_index, path_name))

        die("git update-index: unable to remove %s",

            ptr);

    }

    else {

      /* mode ' ' sha1 '\t' name

       * ptr[-1] points at tab,

       * ptr[-41] is at the beginning of sha1

       */

      ptr[-(hexsz + 2)] = ptr[-1] = 0;

      if (add_cacheinfo(mode, &oid, path_name, stage))

        die("git update-index: unable to update %s",

            path_name);

    }

    continue;

  bad_line:

    die("malformed index info %s", buf.buf);

  }

  strbuf_release(&buf);

  strbuf_release(&uq);

}

static const char * const update_index_usage[] = {

  N_("git update-index [<options>] [--] [<file>...]"),

  NULL

};

static struct cache_entry *read_one_ent(const char *which,

          struct object_id *ent, const char *path,

          int namelen, int stage)

{

  unsigned short mode;

  struct object_id oid;

  struct cache_entry *ce;

  if (get_tree_entry(the_repository, ent, path, &oid, &mode)) {

    if (which)

      error("%s: not in %s branch.", path, which);

    return NULL;

  }

  if (!the_index.sparse_index && mode == S_IFDIR) {

    if (which)

      error("%s: not a blob in %s branch.", path, which);

    return NULL;

  }

  ce = make_empty_cache_entry(&the_index, namelen);

  oidcpy(&ce->oid, &oid);

  memcpy(ce->name, path, namelen);

  ce->ce_flags = create_ce_flags(stage);

  ce->ce_namelen = namelen;

  ce->ce_mode = create_ce_mode(mode);

  return ce;

}

static int unresolve_one(const char *path)

{

  struct string_list_item *item;

  int res = 0;

  if (!the_index.resolve_undo)

    return res;

  item = string_list_lookup(the_index.resolve_undo, path);

  if (!item)

    return res; /* no resolve-undo record for the path */

  res = unmerge_index_entry(&the_index, path, item->util, 0);

  FREE_AND_NULL(item->util);

  return res;

}

static int do_unresolve(int ac, const char **av,

      const char *prefix, int prefix_length)

{

  int i;

  int err = 0;

  for (i = 1; i < ac; i++) {

    const char *arg = av[i];

    char *p = prefix_path(prefix, prefix_length, arg);

    err |= unresolve_one(p);

    free(p);

  }

  return err;

}

static int do_reupdate(const char **paths,

           const char *prefix)

{

  /* Read HEAD and run update-index on paths that are

   * merged and already different between index and HEAD.

   */

  int pos;

  int has_head = 1;

  struct pathspec pathspec;

  struct object_id head_oid;

  parse_pathspec(&pathspec, 0,

           PATHSPEC_PREFER_CWD,

           prefix, paths);

  if (read_ref("HEAD", &head_oid))

    /* If there is no HEAD, that means it is an initial

     * commit.  Update everything in the index.

     */

    has_head = 0;

 redo:

  for (pos = 0; pos < the_index.cache_nr; pos++) {

    const struct cache_entry *ce = the_index.cache[pos];

    struct cache_entry *old = NULL;

    int save_nr;

    char *path;

    if (ce_stage(ce) || !ce_path_match(&the_index, ce, &pathspec, NULL))

      continue;

    if (has_head)

      old = read_one_ent(NULL, &head_oid,

             ce->name, ce_namelen(ce), 0);

    if (old && ce->ce_mode == old->ce_mode &&

        oideq(&ce->oid, &old->oid)) {

      discard_cache_entry(old);

      continue; /* unchanged */

    }

    /* At this point, we know the contents of the sparse directory are

     * modified with respect to HEAD, so we expand the index and restart

     * to process each path individually

     */

    if (S_ISSPARSEDIR(ce->ce_mode)) {

      ensure_full_index(&the_index);

      goto redo;

    }

    /* Be careful.  The working tree may not have the

     * path anymore, in which case, under 'allow_remove',

     * or worse yet 'allow_replace', active_nr may decrease.

     */

    save_nr = the_index.cache_nr;

    path = xstrdup(ce->name);

    update_one(path);

    free(path);

    discard_cache_entry(old);

    if (save_nr != the_index.cache_nr)

      goto redo;

  }

  clear_pathspec(&pathspec);

  return 0;

}

struct refresh_params {

  unsigned int flags;

  int *has_errors;

};

static int refresh(struct refresh_params *o, unsigned int flag)

{

  setup_work_tree();

  repo_read_index(the_repository);

  *o->has_errors |= refresh_index(&the_index, o->flags | flag, NULL,

          NULL, NULL);

  if (has_racy_timestamp(&the_index)) {

    /*

     * Even if nothing else has changed, updating the file

     * increases the chance that racy timestamps become

     * non-racy, helping future run-time performance.

     * We do that even in case of "errors" returned by

     * refresh_index() as these are no actual errors.

     * cmd_status() does the same.

     */

    the_index.cache_changed |= SOMETHING_CHANGED;

  }

  return 0;

}

static int refresh_callback(const struct option *opt,

        const char *arg, int unset)

{

  BUG_ON_OPT_NEG(unset);

  BUG_ON_OPT_ARG(arg);

  return refresh(opt->value, 0);

}

static int really_refresh_callback(const struct option *opt,

        const char *arg, int unset)

{

  BUG_ON_OPT_NEG(unset);

  BUG_ON_OPT_ARG(arg);

  return refresh(opt->value, REFRESH_REALLY);

}

static int chmod_callback(const struct option *opt,

        const char *arg, int unset)

{

  char *flip = opt->value;

  BUG_ON_OPT_NEG(unset);

  if ((arg[0] != '-' && arg[0] != '+') || arg[1] != 'x' || arg[2])

    return error("option 'chmod' expects \"+x\" or \"-x\"");

  *flip = arg[0];

  return 0;

}

static int resolve_undo_clear_callback(const struct option *opt UNUSED,

        const char *arg, int unset)

{

  BUG_ON_OPT_NEG(unset);

  BUG_ON_OPT_ARG(arg);

  resolve_undo_clear_index(&the_index);

  return 0;

}

static int parse_new_style_cacheinfo(const char *arg,

             unsigned int *mode,

             struct object_id *oid,

             const char **path)

{

  unsigned long ul;

  char *endp;

  const char *p;

  if (!arg)

    return -1;

  errno = 0;

  ul = strtoul(arg, &endp, 8);

  if (errno || endp == arg || *endp != ',' || (unsigned int) ul != ul)

    return -1; /* not a new-style cacheinfo */

  *mode = ul;

  endp++;

  if (parse_oid_hex(endp, oid, &p) || *p != ',')

    return -1;

  *path = p + 1;

  return 0;

}

static enum parse_opt_result cacheinfo_callback(

  struct parse_opt_ctx_t *ctx, const struct option *opt UNUSED,

  const char *arg, int unset)

{

  struct object_id oid;

  unsigned int mode;

  const char *path;

  BUG_ON_OPT_NEG(unset);

  BUG_ON_OPT_ARG(arg);

  if (!parse_new_style_cacheinfo(ctx->argv[1], &mode, &oid, &path)) {

    if (add_cacheinfo(mode, &oid, path, 0))

      die("git update-index: --cacheinfo cannot add %s", path);

    ctx->argv++;

    ctx->argc--;

    return 0;

  }

  if (ctx->argc <= 3)

    return error("option 'cacheinfo' expects <mode>,<sha1>,<path>");

  if (strtoul_ui(*++ctx->argv, 8, &mode) ||

      get_oid_hex(*++ctx->argv, &oid) ||

      add_cacheinfo(mode, &oid, *++ctx->argv, 0))

    die("git update-index: --cacheinfo cannot add %s", *ctx->argv);

  ctx->argc -= 3;

  return 0;

}

static enum parse_opt_result stdin_cacheinfo_callback(

  struct parse_opt_ctx_t *ctx, const struct option *opt,

  const char *arg, int unset)

{

  int *nul_term_line = opt->value;

  BUG_ON_OPT_NEG(unset);

  BUG_ON_OPT_ARG(arg);

  if (ctx->argc != 1)

    return error("option '%s' must be the last argument", opt->long_name);

  allow_add = allow_replace = allow_remove = 1;

  read_index_info(*nul_term_line);

  return 0;

}

static enum parse_opt_result stdin_callback(

  struct parse_opt_ctx_t *ctx, const struct option *opt,

  const char *arg, int unset)

{

  int *read_from_stdin = opt->value;

  BUG_ON_OPT_NEG(unset);

  BUG_ON_OPT_ARG(arg);

  if (ctx->argc != 1)

    return error("option '%s' must be the last argument", opt->long_name);

  *read_from_stdin = 1;

  return 0;

}

static enum parse_opt_result unresolve_callback(

  struct parse_opt_ctx_t *ctx, const struct option *opt,

  const char *arg, int unset)

{

  int *has_errors = opt->value;

  const char *prefix = startup_info->prefix;

  BUG_ON_OPT_NEG(unset);

  BUG_ON_OPT_ARG(arg);

  /* consume remaining arguments. */

  *has_errors = do_unresolve(ctx->argc, ctx->argv,