/src/git/builtin/fsck.c

Source (jump to first uncovered line)
#include "builtin.h"
#include "gettext.h"
#include "hex.h"
#include "repository.h"
#include "config.h"
#include "commit.h"
#include "tree.h"
#include "blob.h"
#include "tag.h"
#include "refs.h"
#include "pack.h"
#include "cache-tree.h"
#include "fsck.h"
#include "parse-options.h"
#include "progress.h"
#include "streaming.h"
#include "packfile.h"
#include "object-file.h"
#include "object-name.h"
#include "object-store-ll.h"
#include "path.h"
#include "read-cache-ll.h"
#include "replace-object.h"
#include "resolve-undo.h"
#include "run-command.h"
#include "sparse-index.h"
#include "worktree.h"
#include "pack-revindex.h"
#include "pack-bitmap.h"

#define REACHABLE 0x0001
#define SEEN      0x0002
#define HAS_OBJ   0x0004
/* This flag is set if something points to this object. */
#define USED      0x0008

static int show_root;
static int show_tags;
static int show_unreachable;
static int include_reflogs = 1;
static int check_full = 1;
static int connectivity_only;
static int check_strict;
static int keep_cache_objects;
static struct fsck_options fsck_walk_options = FSCK_OPTIONS_DEFAULT;
static struct fsck_options fsck_obj_options = FSCK_OPTIONS_DEFAULT;
static int errors_found;
static int write_lost_and_found;
static int verbose;
static int show_progress = -1;
static int show_dangling = 1;
static int name_objects;
#define ERROR_OBJECT 01
#define ERROR_REACHABLE 02
#define ERROR_PACK 04
#define ERROR_REFS 010
#define ERROR_COMMIT_GRAPH 020
#define ERROR_MULTI_PACK_INDEX 040
#define ERROR_PACK_REV_INDEX 0100
#define ERROR_BITMAP 0200

static const char *describe_object(const struct object_id *oid)
{
  return fsck_describe_object(&fsck_walk_options, oid);
}

static const char *printable_type(const struct object_id *oid,
          enum object_type type)
{
  const char *ret;

  if (type == OBJ_NONE)
    type = oid_object_info(the_repository, oid, NULL);

  ret = type_name(type);
  if (!ret)
    ret = _("unknown");

  return ret;
}

static int objerror(struct object *obj, const char *err)
{
  errors_found |= ERROR_OBJECT;
  /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
  fprintf_ln(stderr, _("error in %s %s: %s"),
       printable_type(&obj->oid, obj->type),
       describe_object(&obj->oid), err);
  return -1;
}

static int fsck_objects_error_func(struct fsck_options *o UNUSED,
           void *fsck_report,
           enum fsck_msg_type msg_type,
           enum fsck_msg_id msg_id UNUSED,
           const char *message)
{
  struct fsck_object_report *report = fsck_report;
  const struct object_id *oid = report->oid;
  enum object_type object_type = report->object_type;

  switch (msg_type) {
  case FSCK_WARN:
    /* TRANSLATORS: e.g. warning in tree 01bfda: <more explanation> */
    fprintf_ln(stderr, _("warning in %s %s: %s"),
         printable_type(oid, object_type),
         describe_object(oid), message);
    return 0;
  case FSCK_ERROR:
    /* TRANSLATORS: e.g. error in tree 01bfda: <more explanation> */
    fprintf_ln(stderr, _("error in %s %s: %s"),
         printable_type(oid, object_type),
         describe_object(oid), message);
    return 1;
  default:
    BUG("%d (FSCK_IGNORE?) should never trigger this callback",
        msg_type);
  }
}

static struct object_array pending;

static int mark_object(struct object *obj, enum object_type type,
           void *data, struct fsck_options *options UNUSED)
{
  struct object *parent = data;

  /*
   * The only case data is NULL or type is OBJ_ANY is when
   * mark_object_reachable() calls us.  All the callers of
   * that function has non-NULL obj hence ...
   */
  if (!obj) {
    /* ... these references to parent->fld are safe here */
    printf_ln(_("broken link from %7s %s"),
        printable_type(&parent->oid, parent->type),
        describe_object(&parent->oid));
    printf_ln(_("broken link from %7s %s"),
        (type == OBJ_ANY ? _("unknown") : type_name(type)),
        _("unknown"));
    errors_found |= ERROR_REACHABLE;
    return 1;
  }

  if (type != OBJ_ANY && obj->type != type)
    /* ... and the reference to parent is safe here */
    objerror(parent, _("wrong object type in link"));

  if (obj->flags & REACHABLE)
    return 0;
  obj->flags |= REACHABLE;

  if (is_promisor_object(&obj->oid))
    /*
     * Further recursion does not need to be performed on this
     * object since it is a promisor object (so it does not need to
     * be added to "pending").
     */
    return 0;

  if (!(obj->flags & HAS_OBJ)) {
    if (parent && !has_object(the_repository, &obj->oid, 1)) {
      printf_ln(_("broken link from %7s %s\n"
            "              to %7s %s"),
          printable_type(&parent->oid, parent->type),
          describe_object(&parent->oid),
          printable_type(&obj->oid, obj->type),
          describe_object(&obj->oid));
      errors_found |= ERROR_REACHABLE;
    }
    return 1;
  }

  add_object_array(obj, NULL, &pending);
  return 0;
}

static void mark_object_reachable(struct object *obj)
{
  mark_object(obj, OBJ_ANY, NULL, NULL);
}

static int traverse_one_object(struct object *obj)
{
  int result = fsck_walk(obj, obj, &fsck_walk_options);

  if (obj->type == OBJ_TREE) {
    struct tree *tree = (struct tree *)obj;
    free_tree_buffer(tree);
  }
  return result;
}

static int traverse_reachable(void)
{
  struct progress *progress = NULL;
  unsigned int nr = 0;
  int result = 0;
  if (show_progress)
    progress = start_delayed_progress(_("Checking connectivity"), 0);
  while (pending.nr) {
    result |= traverse_one_object(object_array_pop(&pending));
    display_progress(progress, ++nr);
  }
  stop_progress(&progress);
  return !!result;
}

static int mark_used(struct object *obj, enum object_type type UNUSED,
         void *data UNUSED, struct fsck_options *options UNUSED)
{
  if (!obj)
    return 1;
  obj->flags |= USED;
  return 0;
}

static void mark_unreachable_referents(const struct object_id *oid)
{
  struct fsck_options options = FSCK_OPTIONS_DEFAULT;
  struct object *obj = lookup_object(the_repository, oid);

  if (!obj || !(obj->flags & HAS_OBJ))
    return; /* not part of our original set */
  if (obj->flags & REACHABLE)
    return; /* reachable objects already traversed */

  /*
   * Avoid passing OBJ_NONE to fsck_walk, which will parse the object
   * (and we want to avoid parsing blobs).
   */
  if (obj->type == OBJ_NONE) {
    enum object_type type = oid_object_info(the_repository,
              &obj->oid, NULL);
    if (type > 0)
      object_as_type(obj, type, 0);
  }

  options.walk = mark_used;
  fsck_walk(obj, NULL, &options);
  if (obj->type == OBJ_TREE)
    free_tree_buffer((struct tree *)obj);
}

static int mark_loose_unreachable_referents(const struct object_id *oid,
              const char *path UNUSED,
              void *data UNUSED)
{
  mark_unreachable_referents(oid);
  return 0;
}

static int mark_packed_unreachable_referents(const struct object_id *oid,
               struct packed_git *pack UNUSED,
               uint32_t pos UNUSED,
               void *data UNUSED)
{
  mark_unreachable_referents(oid);
  return 0;
}

/*
 * Check a single reachable object
 */
static void check_reachable_object(struct object *obj)
{
  /*
   * We obviously want the object to be parsed,
   * except if it was in a pack-file and we didn't
   * do a full fsck
   */
  if (!(obj->flags & HAS_OBJ)) {
    if (is_promisor_object(&obj->oid))
      return;
    if (has_object_pack(&obj->oid))
      return; /* it is in pack - forget about it */
    printf_ln(_("missing %s %s"),
        printable_type(&obj->oid, obj->type),
        describe_object(&obj->oid));
    errors_found |= ERROR_REACHABLE;
    return;
  }
}

/*
 * Check a single unreachable object
 */
static void check_unreachable_object(struct object *obj)
{
  /*
   * Missing unreachable object? Ignore it. It's not like
   * we miss it (since it can't be reached), nor do we want
   * to complain about it being unreachable (since it does
   * not exist).
   */
  if (!(obj->flags & HAS_OBJ))
    return;

  /*
   * Unreachable object that exists? Show it if asked to,
   * since this is something that is prunable.
   */
  if (show_unreachable) {
    printf_ln(_("unreachable %s %s"),
        printable_type(&obj->oid, obj->type),
        describe_object(&obj->oid));
    return;
  }

  /*
   * "!USED" means that nothing at all points to it, including
   * other unreachable objects. In other words, it's the "tip"
   * of some set of unreachable objects, usually a commit that
   * got dropped.
   *
   * Such starting points are more interesting than some random
   * set of unreachable objects, so we show them even if the user
   * hasn't asked for _all_ unreachable objects. If you have
   * deleted a branch by mistake, this is a prime candidate to
   * start looking at, for example.
   */
  if (!(obj->flags & USED)) {
    if (show_dangling)
      printf_ln(_("dangling %s %s"),
          printable_type(&obj->oid, obj->type),
          describe_object(&obj->oid));
    if (write_lost_and_found) {
      char *filename = git_pathdup("lost-found/%s/%s",
        obj->type == OBJ_COMMIT ? "commit" : "other",
        describe_object(&obj->oid));
      FILE *f;

      if (safe_create_leading_directories_const(filename)) {
        error(_("could not create lost-found"));
        free(filename);
        return;
      }
      f = xfopen(filename, "w");
      if (obj->type == OBJ_BLOB) {
        if (stream_blob_to_fd(fileno(f), &obj->oid, NULL, 1))
          die_errno(_("could not write '%s'"), filename);
      } else
        fprintf(f, "%s\n", describe_object(&obj->oid));
      if (fclose(f))
        die_errno(_("could not finish '%s'"),
            filename);
      free(filename);
    }
    return;
  }

  /*
   * Otherwise? It's there, it's unreachable, and some other unreachable
   * object points to it. Ignore it - it's not interesting, and we showed
   * all the interesting cases above.
   */
}

static void check_object(struct object *obj)
{
  if (verbose)
    fprintf_ln(stderr, _("Checking %s"), describe_object(&obj->oid));

  if (obj->flags & REACHABLE)
    check_reachable_object(obj);
  else
    check_unreachable_object(obj);
}

static void check_connectivity(void)
{
  int i, max;

  /* Traverse the pending reachable objects */
  traverse_reachable();

  /*
   * With --connectivity-only, we won't have actually opened and marked
   * unreachable objects with USED. Do that now to make --dangling, etc
   * accurate.
   */
  if (connectivity_only && (show_dangling || write_lost_and_found)) {
    /*
     * Even though we already have a "struct object" for each of
     * these in memory, we must not iterate over the internal
     * object hash as we do below. Our loop would potentially
     * resize the hash, making our iteration invalid.
     *
     * Instead, we'll just go back to the source list of objects,
     * and ignore any that weren't present in our earlier
     * traversal.
     */
    for_each_loose_object(mark_loose_unreachable_referents, NULL, 0);
    for_each_packed_object(mark_packed_unreachable_referents, NULL, 0);
  }

  /* Look up all the requirements, warn about missing objects.. */
  max = get_max_object_index();
  if (verbose)
    fprintf_ln(stderr, _("Checking connectivity (%d objects)"), max);

  for (i = 0; i < max; i++) {
    struct object *obj = get_indexed_object(i);

    if (obj)
      check_object(obj);
  }
}

static int fsck_obj(struct object *obj, void *buffer, unsigned long size)
{
  int err;

  if (obj->flags & SEEN)
    return 0;
  obj->flags |= SEEN;

  if (verbose)
    fprintf_ln(stderr, _("Checking %s %s"),
         printable_type(&obj->oid, obj->type),
         describe_object(&obj->oid));

  if (fsck_walk(obj, NULL, &fsck_obj_options))
    objerror(obj, _("broken links"));
  err = fsck_object(obj, buffer, size, &fsck_obj_options);
  if (err)
    goto out;

  if (obj->type == OBJ_COMMIT) {
    struct commit *commit = (struct commit *) obj;

    if (!commit->parents && show_root)
      printf_ln(_("root %s"),
          describe_object(&commit->object.oid));
  }

  if (obj->type == OBJ_TAG) {
    struct tag *tag = (struct tag *) obj;

    if (show_tags && tag->tagged) {
      printf_ln(_("tagged %s %s (%s) in %s"),
          printable_type(&tag->tagged->oid, tag->tagged->type),
          describe_object(&tag->tagged->oid),
          tag->tag,
          describe_object(&tag->object.oid));
    }
  }

out:
  if (obj->type == OBJ_TREE)
    free_tree_buffer((struct tree *)obj);
  return err;
}

static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
         unsigned long size, void *buffer, int *eaten)
{
  /*
   * Note, buffer may be NULL if type is OBJ_BLOB. See
   * verify_packfile(), data_valid variable for details.
   */
  struct object *obj;
  obj = parse_object_buffer(the_repository, oid, type, size, buffer,
          eaten);
  if (!obj) {
    errors_found |= ERROR_OBJECT;
    return error(_("%s: object corrupt or missing"),
           oid_to_hex(oid));
  }
  obj->flags &= ~(REACHABLE | SEEN);
  obj->flags |= HAS_OBJ;
  return fsck_obj(obj, buffer, size);
}

static int default_refs;

static void fsck_handle_reflog_oid(const char *refname, struct object_id *oid,
  timestamp_t timestamp)
{
  struct object *obj;

  if (!is_null_oid(oid)) {
    obj = lookup_object(the_repository, oid);
    if (obj && (obj->flags & HAS_OBJ)) {
      if (timestamp)
        fsck_put_object_name(&fsck_walk_options, oid,
                 "%s@{%"PRItime"}",
                 refname, timestamp);
      obj->flags |= USED;
      mark_object_reachable(obj);
    } else if (!is_promisor_object(oid)) {
      error(_("%s: invalid reflog entry %s"),
            refname, oid_to_hex(oid));
      errors_found |= ERROR_REACHABLE;
    }
  }
}

static int fsck_handle_reflog_ent(struct object_id *ooid, struct object_id *noid,
          const char *email UNUSED,
          timestamp_t timestamp, int tz UNUSED,
          const char *message UNUSED, void *cb_data)
{
  const char *refname = cb_data;

  if (verbose)
    fprintf_ln(stderr, _("Checking reflog %s->%s"),
         oid_to_hex(ooid), oid_to_hex(noid));

  fsck_handle_reflog_oid(refname, ooid, 0);
  fsck_handle_reflog_oid(refname, noid, timestamp);
  return 0;
}

static int fsck_handle_reflog(const char *logname, void *cb_data)
{
  struct strbuf refname = STRBUF_INIT;

  strbuf_worktree_ref(cb_data, &refname, logname);
  refs_for_each_reflog_ent(get_main_ref_store(the_repository),
         refname.buf, fsck_handle_reflog_ent,
         refname.buf);
  strbuf_release(&refname);
  return 0;
}

static int fsck_handle_ref(const char *refname, const char *referent UNUSED, const struct object_id *oid,
         int flag UNUSED, void *cb_data UNUSED)
{
  struct object *obj;

  obj = parse_object(the_repository, oid);
  if (!obj) {
    if (is_promisor_object(oid)) {
      /*
       * Increment default_refs anyway, because this is a
       * valid ref.
       */
       default_refs++;
       return 0;
    }
    error(_("%s: invalid sha1 pointer %s"),
          refname, oid_to_hex(oid));
    errors_found |= ERROR_REACHABLE;
    /* We'll continue with the rest despite the error.. */
    return 0;
  }
  if (obj->type != OBJ_COMMIT && is_branch(refname)) {
    error(_("%s: not a commit"), refname);
    errors_found |= ERROR_REFS;
  }
  default_refs++;
  obj->flags |= USED;
  fsck_put_object_name(&fsck_walk_options,
           oid, "%s", refname);
  mark_object_reachable(obj);

  return 0;
}

static int fsck_head_link(const char *head_ref_name,
        const char **head_points_at,
        struct object_id *head_oid);

static void get_default_heads(void)
{
  struct worktree **worktrees, **p;
  const char *head_points_at;
  struct object_id head_oid;

  refs_for_each_rawref(get_main_ref_store(the_repository),
           fsck_handle_ref, NULL);

  worktrees = get_worktrees();
  for (p = worktrees; *p; p++) {
    struct worktree *wt = *p;
    struct strbuf ref = STRBUF_INIT;

    strbuf_worktree_ref(wt, &ref, "HEAD");
    fsck_head_link(ref.buf, &head_points_at, &head_oid);
    if (head_points_at && !is_null_oid(&head_oid))
      fsck_handle_ref(ref.buf, NULL, &head_oid, 0, NULL);
    strbuf_release(&ref);

    if (include_reflogs)
      refs_for_each_reflog(get_worktree_ref_store(wt),
               fsck_handle_reflog, wt);
  }
  free_worktrees(worktrees);

  /*
   * Not having any default heads isn't really fatal, but
   * it does mean that "--unreachable" no longer makes any
   * sense (since in this case everything will obviously
   * be unreachable by definition.
   *
   * Showing dangling objects is valid, though (as those
   * dangling objects are likely lost heads).
   *
   * So we just print a warning about it, and clear the
   * "show_unreachable" flag.
   */
  if (!default_refs) {
    fprintf_ln(stderr, _("notice: No default references"));
    show_unreachable = 0;
  }
}

struct for_each_loose_cb
{
  struct progress *progress;
  struct strbuf obj_type;
};

static int fsck_loose(const struct object_id *oid, const char *path, void *data)
{
  struct for_each_loose_cb *cb_data = data;
  struct object *obj;
  enum object_type type = OBJ_NONE;
  unsigned long size;
  void *contents = NULL;
  int eaten;
  struct object_info oi = OBJECT_INFO_INIT;
  struct object_id real_oid = *null_oid();
  int err = 0;

  strbuf_reset(&cb_data->obj_type);
  oi.type_name = &cb_data->obj_type;
  oi.sizep = &size;
  oi.typep = &type;

  if (read_loose_object(path, oid, &real_oid, &contents, &oi) < 0) {
    if (contents && !oideq(&real_oid, oid))
      err = error(_("%s: hash-path mismatch, found at: %s"),
            oid_to_hex(&real_oid), path);
    else
      err = error(_("%s: object corrupt or missing: %s"),
            oid_to_hex(oid), path);
  }
  if (type != OBJ_NONE && type < 0)
    err = error(_("%s: object is of unknown type '%s': %s"),
          oid_to_hex(&real_oid), cb_data->obj_type.buf,
          path);
  if (err < 0) {
    errors_found |= ERROR_OBJECT;
    free(contents);
    return 0; /* keep checking other objects */
  }

  if (!contents && type != OBJ_BLOB)
    BUG("read_loose_object streamed a non-blob");

  obj = parse_object_buffer(the_repository, oid, type, size,
          contents, &eaten);

  if (!obj) {
    errors_found |= ERROR_OBJECT;
    error(_("%s: object could not be parsed: %s"),
          oid_to_hex(oid), path);
    if (!eaten)
      free(contents);
    return 0; /* keep checking other objects */
  }

  obj->flags &= ~(REACHABLE | SEEN);
  obj->flags |= HAS_OBJ;
  if (fsck_obj(obj, contents, size))
    errors_found |= ERROR_OBJECT;

  if (!eaten)
    free(contents);
  return 0; /* keep checking other objects, even if we saw an error */
}

static int fsck_cruft(const char *basename, const char *path,
          void *data UNUSED)
{
  if (!starts_with(basename, "tmp_obj_"))
    fprintf_ln(stderr, _("bad sha1 file: %s"), path);
  return 0;
}

static int fsck_subdir(unsigned int nr, const char *path UNUSED, void *data)
{
  struct for_each_loose_cb *cb_data = data;
  struct progress *progress = cb_data->progress;
  display_progress(progress, nr + 1);
  return 0;
}

static void fsck_object_dir(const char *path)
{
  struct progress *progress = NULL;
  struct for_each_loose_cb cb_data = {
    .obj_type = STRBUF_INIT,
    .progress = progress,
  };

  if (verbose)
    fprintf_ln(stderr, _("Checking object directory"));

  if (show_progress)
    progress = start_progress(_("Checking object directories"), 256);

  for_each_loose_file_in_objdir(path, fsck_loose, fsck_cruft, fsck_subdir,
              &cb_data);
  display_progress(progress, 256);
  stop_progress(&progress);
  strbuf_release(&cb_data.obj_type);
}

static int fsck_head_link(const char *head_ref_name,
        const char **head_points_at,
        struct object_id *head_oid)
{
  int null_is_error = 0;

  if (verbose)
    fprintf_ln(stderr, _("Checking %s link"), head_ref_name);

  *head_points_at = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
              head_ref_name, 0, head_oid,
              NULL);
  if (!*head_points_at) {
    errors_found |= ERROR_REFS;
    return error(_("invalid %s"), head_ref_name);
  }
  if (!strcmp(*head_points_at, head_ref_name))
    /* detached HEAD */
    null_is_error = 1;
  else if (!starts_with(*head_points_at, "refs/heads/")) {
    errors_found |= ERROR_REFS;
    return error(_("%s points to something strange (%s)"),
           head_ref_name, *head_points_at);
  }
  if (is_null_oid(head_oid)) {
    if (null_is_error) {
      errors_found |= ERROR_REFS;
      return error(_("%s: detached HEAD points at nothing"),
             head_ref_name);
    }
    fprintf_ln(stderr,
         _("notice: %s points to an unborn branch (%s)"),
         head_ref_name, *head_points_at + 11);
  }
  return 0;
}

static int fsck_cache_tree(struct cache_tree *it, const char *index_path)
{
  int i;
  int err = 0;

  if (verbose)
    fprintf_ln(stderr, _("Checking cache tree of %s"), index_path);

  if (0 <= it->entry_count) {
    struct object *obj = parse_object(the_repository, &it->oid);
    if (!obj) {
      error(_("%s: invalid sha1 pointer in cache-tree of %s"),
            oid_to_hex(&it->oid), index_path);
      errors_found |= ERROR_REFS;
      return 1;
    }
    obj->flags |= USED;
    fsck_put_object_name(&fsck_walk_options, &it->oid, ":");
    mark_object_reachable(obj);
    if (obj->type != OBJ_TREE)
      err |= objerror(obj, _("non-tree in cache-tree"));
  }
  for (i = 0; i < it->subtree_nr; i++)
    err |= fsck_cache_tree(it->down[i]->cache_tree, index_path);
  return err;
}

static int fsck_resolve_undo(struct index_state *istate,
           const char *index_path)
{
  struct string_list_item *item;
  struct string_list *resolve_undo = istate->resolve_undo;

  if (!resolve_undo)
    return 0;

  for_each_string_list_item(item, resolve_undo) {
    const char *path = item->string;
    struct resolve_undo_info *ru = item->util;
    int i;

    if (!ru)
      continue;
    for (i = 0; i < 3; i++) {
      struct object *obj;

      if (!ru->mode[i] || !S_ISREG(ru->mode[i]))
        continue;

      obj = parse_object(the_repository, &ru->oid[i]);
      if (!obj) {
        error(_("%s: invalid sha1 pointer in resolve-undo of %s"),
              oid_to_hex(&ru->oid[i]),
              index_path);
        errors_found |= ERROR_REFS;
        continue;
      }
      obj->flags |= USED;
      fsck_put_object_name(&fsck_walk_options, &ru->oid[i],
               ":(%d):%s", i, path);
      mark_object_reachable(obj);
    }
  }
  return 0;
}

static void fsck_index(struct index_state *istate, const char *index_path,
           int is_current_worktree)
{
  unsigned int i;

  /* TODO: audit for interaction with sparse-index. */
  ensure_full_index(istate);
  for (i = 0; i < istate->cache_nr; i++) {
    unsigned int mode;
    struct blob *blob;
    struct object *obj;

    mode = istate->cache[i]->ce_mode;
    if (S_ISGITLINK(mode))
      continue;
    blob = lookup_blob(the_repository,
           &istate->cache[i]->oid);
    if (!blob)
      continue;
    obj = &blob->object;
    obj->flags |= USED;
    fsck_put_object_name(&fsck_walk_options, &obj->oid,
             "%s:%s",
             is_current_worktree ? "" : index_path,
             istate->cache[i]->name);
    mark_object_reachable(obj);
  }
  if (istate->cache_tree)
    fsck_cache_tree(istate->cache_tree, index_path);
  fsck_resolve_undo(istate, index_path);
}

static void mark_object_for_connectivity(const struct object_id *oid)
{
  struct object *obj = lookup_unknown_object(the_repository, oid);
  obj->flags |= HAS_OBJ;
}

static int mark_loose_for_connectivity(const struct object_id *oid,
               const char *path UNUSED,
               void *data UNUSED)
{
  mark_object_for_connectivity(oid);
  return 0;
}

static int mark_packed_for_connectivity(const struct object_id *oid,
          struct packed_git *pack UNUSED,
          uint32_t pos UNUSED,
          void *data UNUSED)
{
  mark_object_for_connectivity(oid);
  return 0;
}

static int check_pack_rev_indexes(struct repository *r, int show_progress)
{
  struct progress *progress = NULL;
  uint32_t pack_count = 0;
  int res = 0;

  if (show_progress) {
    for (struct packed_git *p = get_all_packs(r); p; p = p->next)
      pack_count++;
    progress = start_delayed_progress("Verifying reverse pack-indexes", pack_count);
    pack_count = 0;
  }

  for (struct packed_git *p = get_all_packs(r); p; p = p->next) {
    int load_error = load_pack_revindex_from_disk(p);

    if (load_error < 0) {
      error(_("unable to load rev-index for pack '%s'"), p->pack_name);
      res = ERROR_PACK_REV_INDEX;
    } else if (!load_error &&
         !load_pack_revindex(r, p) &&
         verify_pack_revindex(p)) {
      error(_("invalid rev-index for pack '%s'"), p->pack_name);
      res = ERROR_PACK_REV_INDEX;
    }
    display_progress(progress, ++pack_count);
  }
  stop_progress(&progress);

  return res;
}

static char const * const fsck_usage[] = {
  N_("git fsck [--tags] [--root] [--unreachable] [--cache] [--no-reflogs]\n"
     "         [--[no-]full] [--strict] [--verbose] [--lost-found]\n"
     "         [--[no-]dangling] [--[no-]progress] [--connectivity-only]\n"
     "         [--[no-]name-objects] [<object>...]"),
  NULL
};

static struct option fsck_opts[] = {
  OPT__VERBOSE(&verbose, N_("be verbose")),
  OPT_BOOL(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
  OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
  OPT_BOOL(0, "tags", &show_tags, N_("report tags")),
  OPT_BOOL(0, "root", &show_root, N_("report root nodes")),
  OPT_BOOL(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
  OPT_BOOL(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
  OPT_BOOL(0, "full", &check_full, N_("also consider packs and alternate objects")),
  OPT_BOOL(0, "connectivity-only", &connectivity_only, N_("check only connectivity")),
  OPT_BOOL(0, "strict", &check_strict, N_("enable more strict checking")),
  OPT_BOOL(0, "lost-found", &write_lost_and_found,
        N_("write dangling objects in .git/lost-found")),
  OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
  OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
  OPT_END(),
};

int cmd_fsck(int argc, const char **argv, const char *prefix)
{
  int i;
  struct object_directory *odb;

  /* fsck knows how to handle missing promisor objects */
  fetch_if_missing = 0;

  errors_found = 0;
  disable_replace_refs();
  save_commit_buffer = 0;

  argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);

  fsck_walk_options.walk = mark_object;
  fsck_obj_options.walk = mark_used;
  fsck_obj_options.error_func = fsck_objects_error_func;
  if (check_strict)
    fsck_obj_options.strict = 1;

  if (show_progress == -1)
    show_progress = isatty(2);
  if (verbose)
    show_progress = 0;

  if (write_lost_and_found) {
    check_full = 1;
    include_reflogs = 0;
  }

  if (name_objects)
    fsck_enable_object_names(&fsck_walk_options);

  git_config(git_fsck_config, &fsck_obj_options);
  prepare_repo_settings(the_repository);

  if (connectivity_only) {
    for_each_loose_object(mark_loose_for_connectivity, NULL, 0);
    for_each_packed_object(mark_packed_for_connectivity, NULL, 0);
  } else {
    prepare_alt_odb(the_repository);
    for (odb = the_repository->objects->odb; odb; odb = odb->next)
      fsck_object_dir(odb->path);

    if (check_full) {
      struct packed_git *p;
      uint32_t total = 0, count = 0;
      struct progress *progress = NULL;

      if (show_progress) {
        for (p = get_all_packs(the_repository); p;
             p = p->next) {
          if (open_pack_index(p))
            continue;
          total += p->num_objects;
        }

        progress = start_progress(_("Checking objects"), total);
      }
      for (p = get_all_packs(the_repository); p;
           p = p->next) {
        /* verify gives error messages itself */
        if (verify_pack(the_repository,
            p, fsck_obj_buffer,
            progress, count))
          errors_found |= ERROR_PACK;
        count += p->num_objects;
      }
      stop_progress(&progress);
    }

    if (fsck_finish(&fsck_obj_options))
      errors_found |= ERROR_OBJECT;
  }

  for (i = 0; i < argc; i++) {
    const char *arg = argv[i];
    struct object_id oid;
    if (!repo_get_oid(the_repository, arg, &oid)) {
      struct object *obj = lookup_object(the_repository,
                 &oid);

      if (!obj || !(obj->flags & HAS_OBJ)) {
        if (is_promisor_object(&oid))
          continue;
        error(_("%s: object missing"), oid_to_hex(&oid));
        errors_found |= ERROR_OBJECT;
        continue;
      }

      obj->flags |= USED;
      fsck_put_object_name(&fsck_walk_options, &oid,
               "%s", arg);
      mark_object_reachable(obj);
      continue;
    }
    error(_("invalid parameter: expected sha1, got '%s'"), arg);
    errors_found |= ERROR_OBJECT;
  }

  /*
   * If we've not been given any explicit head information, do the
   * default ones from .git/refs. We also consider the index file
   * in this case (ie this implies --cache).
   */
  if (!argc) {
    get_default_heads();
    keep_cache_objects = 1;
  }

  if (keep_cache_objects) {
    struct worktree **worktrees, **p;

    verify_index_checksum = 1;
    verify_ce_order = 1;

    worktrees = get_worktrees();
    for (p = worktrees; *p; p++) {
      struct worktree *wt = *p;
      struct index_state istate =
        INDEX_STATE_INIT(the_repository);
      char *path;

      /*
       * Make a copy since the buffer is reusable
       * and may get overwritten by other calls
       * while we're examining the index.
       */
      path = xstrdup(worktree_git_path(the_repository, wt, "index"));
      read_index_from(&istate, path, get_worktree_git_dir(wt));
      fsck_index(&istate, path, wt->is_current);
      discard_index(&istate);
      free(path);
    }
    free_worktrees(worktrees);
  }

  errors_found |= check_pack_rev_indexes(the_repository, show_progress);
  if (verify_bitmap_files(the_repository))
    errors_found |= ERROR_BITMAP;

  check_connectivity();

  if (the_repository->settings.core_commit_graph) {
    struct child_process commit_graph_verify = CHILD_PROCESS_INIT;

    prepare_alt_odb(the_repository);
    for (odb = the_repository->objects->odb; odb; odb = odb->next) {
      child_process_init(&commit_graph_verify);
      commit_graph_verify.git_cmd = 1;
      strvec_pushl(&commit_graph_verify.args, "commit-graph",
             "verify", "--object-dir", odb->path, NULL);
      if (show_progress)
        strvec_push(&commit_graph_verify.args, "--progress");
      else
        strvec_push(&commit_graph_verify.args, "--no-progress");
      if (run_command(&commit_graph_verify))
        errors_found |= ERROR_COMMIT_GRAPH;
    }
  }

  if (the_repository->settings.core_multi_pack_index) {
    struct child_process midx_verify = CHILD_PROCESS_INIT;

    prepare_alt_odb(the_repository);
    for (odb = the_repository->objects->odb; odb; odb = odb->next) {
      child_process_init(&midx_verify);
      midx_verify.git_cmd = 1;
      strvec_pushl(&midx_verify.args, "multi-pack-index",
             "verify", "--object-dir", odb->path, NULL);
      if (show_progress)
        strvec_push(&midx_verify.args, "--progress");
      else
        strvec_push(&midx_verify.args, "--no-progress");
      if (run_command(&midx_verify))
        errors_found |= ERROR_MULTI_PACK_INDEX;
    }
  }

  return errors_found;
}

Coverage Report

Created: 2024-09-08 06:23