/src/git/builtin/fast-export.c

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/*
 * "git fast-export" builtin command
 *
 * Copyright (C) 2007 Johannes E. Schindelin
 */
#include "builtin.h"
#include "config.h"
#include "gettext.h"
#include "hex.h"
#include "refs.h"
#include "refspec.h"
#include "object-file.h"
#include "object-store-ll.h"
#include "commit.h"
#include "object.h"
#include "tag.h"
#include "diff.h"
#include "diffcore.h"
#include "log-tree.h"
#include "revision.h"
#include "decorate.h"
#include "string-list.h"
#include "utf8.h"
#include "parse-options.h"
#include "quote.h"
#include "remote.h"
#include "blob.h"

static const char *fast_export_usage[] = {
  N_("git fast-export [<rev-list-opts>]"),
  NULL
};

static int progress;
static enum signed_tag_mode { SIGNED_TAG_ABORT, VERBATIM, WARN, WARN_STRIP, STRIP } signed_tag_mode = SIGNED_TAG_ABORT;
static enum tag_of_filtered_mode { TAG_FILTERING_ABORT, DROP, REWRITE } tag_of_filtered_mode = TAG_FILTERING_ABORT;
static enum reencode_mode { REENCODE_ABORT, REENCODE_YES, REENCODE_NO } reencode_mode = REENCODE_ABORT;
static int fake_missing_tagger;
static int use_done_feature;
static int no_data;
static int full_tree;
static int reference_excluded_commits;
static int show_original_ids;
static int mark_tags;
static struct string_list extra_refs = STRING_LIST_INIT_DUP;
static struct string_list tag_refs = STRING_LIST_INIT_DUP;
static struct refspec refspecs = REFSPEC_INIT_FETCH;
static int anonymize;
static struct hashmap anonymized_seeds;
static struct revision_sources revision_sources;

static int parse_opt_signed_tag_mode(const struct option *opt,
             const char *arg, int unset)
{
  enum signed_tag_mode *val = opt->value;

  if (unset || !strcmp(arg, "abort"))
    *val = SIGNED_TAG_ABORT;
  else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
    *val = VERBATIM;
  else if (!strcmp(arg, "warn"))
    *val = WARN;
  else if (!strcmp(arg, "warn-strip"))
    *val = WARN_STRIP;
  else if (!strcmp(arg, "strip"))
    *val = STRIP;
  else
    return error("Unknown signed-tags mode: %s", arg);
  return 0;
}

static int parse_opt_tag_of_filtered_mode(const struct option *opt,
            const char *arg, int unset)
{
  enum tag_of_filtered_mode *val = opt->value;

  if (unset || !strcmp(arg, "abort"))
    *val = TAG_FILTERING_ABORT;
  else if (!strcmp(arg, "drop"))
    *val = DROP;
  else if (!strcmp(arg, "rewrite"))
    *val = REWRITE;
  else
    return error("Unknown tag-of-filtered mode: %s", arg);
  return 0;
}

static int parse_opt_reencode_mode(const struct option *opt,
           const char *arg, int unset)
{
  enum reencode_mode *val = opt->value;

  if (unset) {
    *val = REENCODE_ABORT;
    return 0;
  }

  switch (git_parse_maybe_bool(arg)) {
  case 0:
    *val = REENCODE_NO;
    break;
  case 1:
    *val = REENCODE_YES;
    break;
  default:
    if (!strcasecmp(arg, "abort"))
      *val = REENCODE_ABORT;
    else
      return error("Unknown reencoding mode: %s", arg);
  }

  return 0;
}

static struct decoration idnums;
static uint32_t last_idnum;
struct anonymized_entry {
  struct hashmap_entry hash;
  char *anon;
  const char orig[FLEX_ARRAY];
};

struct anonymized_entry_key {
  struct hashmap_entry hash;
  const char *orig;
  size_t orig_len;
};

static int anonymized_entry_cmp(const void *cmp_data UNUSED,
        const struct hashmap_entry *eptr,
        const struct hashmap_entry *entry_or_key,
        const void *keydata)
{
  const struct anonymized_entry *a, *b;

  a = container_of(eptr, const struct anonymized_entry, hash);
  if (keydata) {
    const struct anonymized_entry_key *key = keydata;
    int equal = !xstrncmpz(a->orig, key->orig, key->orig_len);
    return !equal;
  }

  b = container_of(entry_or_key, const struct anonymized_entry, hash);
  return strcmp(a->orig, b->orig);
}

static struct anonymized_entry *add_anonymized_entry(struct hashmap *map,
                 unsigned hash,
                 const char *orig, size_t len,
                 char *anon)
{
  struct anonymized_entry *ret, *old;

  if (!map->cmpfn)
    hashmap_init(map, anonymized_entry_cmp, NULL, 0);

  FLEX_ALLOC_MEM(ret, orig, orig, len);
  hashmap_entry_init(&ret->hash, hash);
  ret->anon = anon;
  old = hashmap_put_entry(map, ret, hash);

  if (old) {
    free(old->anon);
    free(old);
  }

  return ret;
}

/*
 * Basically keep a cache of X->Y so that we can repeatedly replace
 * the same anonymized string with another. The actual generation
 * is farmed out to the generate function.
 */
static const char *anonymize_str(struct hashmap *map,
         char *(*generate)(void),
         const char *orig, size_t len)
{
  struct anonymized_entry_key key;
  struct anonymized_entry *ret;

  hashmap_entry_init(&key.hash, memhash(orig, len));
  key.orig = orig;
  key.orig_len = len;

  /* First check if it's a token the user configured manually... */
  ret = hashmap_get_entry(&anonymized_seeds, &key, hash, &key);

  /* ...otherwise check if we've already seen it in this context... */
  if (!ret)
    ret = hashmap_get_entry(map, &key, hash, &key);

  /* ...and finally generate a new mapping if necessary */
  if (!ret)
    ret = add_anonymized_entry(map, key.hash.hash,
             orig, len, generate());

  return ret->anon;
}

/*
 * We anonymize each component of a path individually,
 * so that paths a/b and a/c will share a common root.
 * The paths are cached via anonymize_mem so that repeated
 * lookups for "a" will yield the same value.
 */
static void anonymize_path(struct strbuf *out, const char *path,
         struct hashmap *map,
         char *(*generate)(void))
{
  while (*path) {
    const char *end_of_component = strchrnul(path, '/');
    size_t len = end_of_component - path;
    const char *c = anonymize_str(map, generate, path, len);
    strbuf_addstr(out, c);
    path = end_of_component;
    if (*path)
      strbuf_addch(out, *path++);
  }
}

static inline void *mark_to_ptr(uint32_t mark)
{
  return (void *)(uintptr_t)mark;
}

static inline uint32_t ptr_to_mark(void * mark)
{
  return (uint32_t)(uintptr_t)mark;
}

static inline void mark_object(struct object *object, uint32_t mark)
{
  add_decoration(&idnums, object, mark_to_ptr(mark));
}

static inline void mark_next_object(struct object *object)
{
  mark_object(object, ++last_idnum);
}

static int get_object_mark(struct object *object)
{
  void *decoration = lookup_decoration(&idnums, object);
  if (!decoration)
    return 0;
  return ptr_to_mark(decoration);
}

static struct commit *rewrite_commit(struct commit *p)
{
  for (;;) {
    if (p->parents && p->parents->next)
      break;
    if (p->object.flags & UNINTERESTING)
      break;
    if (!(p->object.flags & TREESAME))
      break;
    if (!p->parents)
      return NULL;
    p = p->parents->item;
  }
  return p;
}

static void show_progress(void)
{
  static int counter = 0;
  if (!progress)
    return;
  if ((++counter % progress) == 0)
    printf("progress %d objects\n", counter);
}

/*
 * Ideally we would want some transformation of the blob data here
 * that is unreversible, but would still be the same size and have
 * the same data relationship to other blobs (so that we get the same
 * delta and packing behavior as the original). But the first and last
 * requirements there are probably mutually exclusive, so let's take
 * the easy way out for now, and just generate arbitrary content.
 *
 * There's no need to cache this result with anonymize_mem, since
 * we already handle blob content caching with marks.
 */
static char *anonymize_blob(unsigned long *size)
{
  static int counter;
  struct strbuf out = STRBUF_INIT;
  strbuf_addf(&out, "anonymous blob %d", counter++);
  *size = out.len;
  return strbuf_detach(&out, NULL);
}

static void export_blob(const struct object_id *oid)
{
  unsigned long size;
  enum object_type type;
  char *buf;
  struct object *object;
  int eaten;

  if (no_data)
    return;

  if (is_null_oid(oid))
    return;

  object = lookup_object(the_repository, oid);
  if (object && object->flags & SHOWN)
    return;

  if (anonymize) {
    buf = anonymize_blob(&size);
    object = (struct object *)lookup_blob(the_repository, oid);
    eaten = 0;
  } else {
    buf = repo_read_object_file(the_repository, oid, &type, &size);
    if (!buf)
      die("could not read blob %s", oid_to_hex(oid));
    if (check_object_signature(the_repository, oid, buf, size,
             type) < 0)
      die("oid mismatch in blob %s", oid_to_hex(oid));
    object = parse_object_buffer(the_repository, oid, type,
               size, buf, &eaten);
  }

  if (!object)
    die("Could not read blob %s", oid_to_hex(oid));

  mark_next_object(object);

  printf("blob\nmark :%"PRIu32"\n", last_idnum);
  if (show_original_ids)
    printf("original-oid %s\n", oid_to_hex(oid));
  printf("data %"PRIuMAX"\n", (uintmax_t)size);
  if (size && fwrite(buf, size, 1, stdout) != 1)
    die_errno("could not write blob '%s'", oid_to_hex(oid));
  printf("\n");

  show_progress();

  object->flags |= SHOWN;
  if (!eaten)
    free(buf);
}

static int depth_first(const void *a_, const void *b_)
{
  const struct diff_filepair *a = *((const struct diff_filepair **)a_);
  const struct diff_filepair *b = *((const struct diff_filepair **)b_);
  const char *name_a, *name_b;
  int len_a, len_b, len;
  int cmp;

  name_a = a->one ? a->one->path : a->two->path;
  name_b = b->one ? b->one->path : b->two->path;

  len_a = strlen(name_a);
  len_b = strlen(name_b);
  len = (len_a < len_b) ? len_a : len_b;

  /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
  cmp = memcmp(name_a, name_b, len);
  if (cmp)
    return cmp;
  cmp = len_b - len_a;
  if (cmp)
    return cmp;
  /*
   * Move 'R'ename entries last so that all references of the file
   * appear in the output before it is renamed (e.g., when a file
   * was copied and renamed in the same commit).
   */
  return (a->status == 'R') - (b->status == 'R');
}

static void print_path_1(const char *path)
{
  int need_quote = quote_c_style(path, NULL, NULL, 0);
  if (need_quote)
    quote_c_style(path, NULL, stdout, 0);
  else if (strchr(path, ' '))
    printf("\"%s\"", path);
  else
    printf("%s", path);
}

static char *anonymize_path_component(void)
{
  static int counter;
  struct strbuf out = STRBUF_INIT;
  strbuf_addf(&out, "path%d", counter++);
  return strbuf_detach(&out, NULL);
}

static void print_path(const char *path)
{
  if (!anonymize)
    print_path_1(path);
  else {
    static struct hashmap paths;
    static struct strbuf anon = STRBUF_INIT;

    anonymize_path(&anon, path, &paths, anonymize_path_component);
    print_path_1(anon.buf);
    strbuf_reset(&anon);
  }
}

static char *generate_fake_oid(void)
{
  static uint32_t counter = 1; /* avoid null oid */
  const unsigned hashsz = the_hash_algo->rawsz;
  struct object_id oid;
  char *hex = xmallocz(GIT_MAX_HEXSZ);

  oidclr(&oid, the_repository->hash_algo);
  put_be32(oid.hash + hashsz - 4, counter++);
  return oid_to_hex_r(hex, &oid);
}

static const char *anonymize_oid(const char *oid_hex)
{
  static struct hashmap objs;
  size_t len = strlen(oid_hex);
  return anonymize_str(&objs, generate_fake_oid, oid_hex, len);
}

static void show_filemodify(struct diff_queue_struct *q,
          struct diff_options *options UNUSED, void *data)
{
  int i;
  struct string_list *changed = data;

  /*
   * Handle files below a directory first, in case they are all deleted
   * and the directory changes to a file or symlink.
   */
  QSORT(q->queue, q->nr, depth_first);

  for (i = 0; i < q->nr; i++) {
    struct diff_filespec *ospec = q->queue[i]->one;
    struct diff_filespec *spec = q->queue[i]->two;

    switch (q->queue[i]->status) {
    case DIFF_STATUS_DELETED:
      printf("D ");
      print_path(spec->path);
      string_list_insert(changed, spec->path);
      putchar('\n');
      break;

    case DIFF_STATUS_COPIED:
    case DIFF_STATUS_RENAMED:
      /*
       * If a change in the file corresponding to ospec->path
       * has been observed, we cannot trust its contents
       * because the diff is calculated based on the prior
       * contents, not the current contents.  So, declare a
       * copy or rename only if there was no change observed.
       */
      if (!string_list_has_string(changed, ospec->path)) {
        printf("%c ", q->queue[i]->status);
        print_path(ospec->path);
        putchar(' ');
        print_path(spec->path);
        string_list_insert(changed, spec->path);
        putchar('\n');

        if (oideq(&ospec->oid, &spec->oid) &&
            ospec->mode == spec->mode)
          break;
      }
      /* fallthrough */

    case DIFF_STATUS_TYPE_CHANGED:
    case DIFF_STATUS_MODIFIED:
    case DIFF_STATUS_ADDED:
      /*
       * Links refer to objects in another repositories;
       * output the SHA-1 verbatim.
       */
      if (no_data || S_ISGITLINK(spec->mode))
        printf("M %06o %s ", spec->mode,
               anonymize ?
               anonymize_oid(oid_to_hex(&spec->oid)) :
               oid_to_hex(&spec->oid));
      else {
        struct object *object = lookup_object(the_repository,
                      &spec->oid);
        printf("M %06o :%d ", spec->mode,
               get_object_mark(object));
      }
      print_path(spec->path);
      string_list_insert(changed, spec->path);
      putchar('\n');
      break;

    default:
      die("Unexpected comparison status '%c' for %s, %s",
        q->queue[i]->status,
        ospec->path ? ospec->path : "none",
        spec->path ? spec->path : "none");
    }
  }
}

static const char *find_encoding(const char *begin, const char *end)
{
  const char *needle = "\nencoding ";
  char *bol, *eol;

  bol = memmem(begin, end ? end - begin : strlen(begin),
         needle, strlen(needle));
  if (!bol)
    return NULL;
  bol += strlen(needle);
  eol = strchrnul(bol, '\n');
  *eol = '\0';
  return bol;
}

static char *anonymize_ref_component(void)
{
  static int counter;
  struct strbuf out = STRBUF_INIT;
  strbuf_addf(&out, "ref%d", counter++);
  return strbuf_detach(&out, NULL);
}

static const char *anonymize_refname(const char *refname)
{
  /*
   * If any of these prefixes is found, we will leave it intact
   * so that tags remain tags and so forth.
   */
  static const char *prefixes[] = {
    "refs/heads/",
    "refs/tags/",
    "refs/remotes/",
    "refs/"
  };
  static struct hashmap refs;
  static struct strbuf anon = STRBUF_INIT;
  int i;

  strbuf_reset(&anon);
  for (i = 0; i < ARRAY_SIZE(prefixes); i++) {
    if (skip_prefix(refname, prefixes[i], &refname)) {
      strbuf_addstr(&anon, prefixes[i]);
      break;
    }
  }

  anonymize_path(&anon, refname, &refs, anonymize_ref_component);
  return anon.buf;
}

/*
 * We do not even bother to cache commit messages, as they are unlikely
 * to be repeated verbatim, and it is not that interesting when they are.
 */
static char *anonymize_commit_message(void)
{
  static int counter;
  return xstrfmt("subject %d\n\nbody\n", counter++);
}

static char *anonymize_ident(void)
{
  static int counter;
  struct strbuf out = STRBUF_INIT;
  strbuf_addf(&out, "User %d <user%d@example.com>", counter, counter);
  counter++;
  return strbuf_detach(&out, NULL);
}

/*
 * Our strategy here is to anonymize the names and email addresses,
 * but keep timestamps intact, as they influence things like traversal
 * order (and by themselves should not be too revealing).
 */
static void anonymize_ident_line(const char **beg, const char **end)
{
  static struct hashmap idents;
  static struct strbuf buffers[] = { STRBUF_INIT, STRBUF_INIT };
  static unsigned which_buffer;

  struct strbuf *out;
  struct ident_split split;
  const char *end_of_header;

  out = &buffers[which_buffer++];
  which_buffer %= ARRAY_SIZE(buffers);
  strbuf_reset(out);

  /* skip "committer", "author", "tagger", etc */
  end_of_header = strchr(*beg, ' ');
  if (!end_of_header)
    BUG("malformed line fed to anonymize_ident_line: %.*s",
        (int)(*end - *beg), *beg);
  end_of_header++;
  strbuf_add(out, *beg, end_of_header - *beg);

  if (!split_ident_line(&split, end_of_header, *end - end_of_header) &&
      split.date_begin) {
    const char *ident;
    size_t len;

    len = split.mail_end - split.name_begin;
    ident = anonymize_str(&idents, anonymize_ident,
              split.name_begin, len);
    strbuf_addstr(out, ident);
    strbuf_addch(out, ' ');
    strbuf_add(out, split.date_begin, split.tz_end - split.date_begin);
  } else {
    strbuf_addstr(out, "Malformed Ident <malformed@example.com> 0 -0000");
  }

  *beg = out->buf;
  *end = out->buf + out->len;
}

static void handle_commit(struct commit *commit, struct rev_info *rev,
        struct string_list *paths_of_changed_objects)
{
  int saved_output_format = rev->diffopt.output_format;
  const char *commit_buffer;
  const char *author, *author_end, *committer, *committer_end;
  const char *encoding, *message;
  char *reencoded = NULL;
  struct commit_list *p;
  const char *refname;
  int i;

  rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;

  parse_commit_or_die(commit);
  commit_buffer = repo_get_commit_buffer(the_repository, commit, NULL);
  author = strstr(commit_buffer, "\nauthor ");
  if (!author)
    die("could not find author in commit %s",
        oid_to_hex(&commit->object.oid));
  author++;
  author_end = strchrnul(author, '\n');
  committer = strstr(author_end, "\ncommitter ");
  if (!committer)
    die("could not find committer in commit %s",
        oid_to_hex(&commit->object.oid));
  committer++;
  committer_end = strchrnul(committer, '\n');
  message = strstr(committer_end, "\n\n");
  encoding = find_encoding(committer_end, message);
  if (message)
    message += 2;

  if (commit->parents &&
      (get_object_mark(&commit->parents->item->object) != 0 ||
       reference_excluded_commits) &&
      !full_tree) {
    parse_commit_or_die(commit->parents->item);
    diff_tree_oid(get_commit_tree_oid(commit->parents->item),
            get_commit_tree_oid(commit), "", &rev->diffopt);
  }
  else
    diff_root_tree_oid(get_commit_tree_oid(commit),
           "", &rev->diffopt);

  /* Export the referenced blobs, and remember the marks. */
  for (i = 0; i < diff_queued_diff.nr; i++)
    if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
      export_blob(&diff_queued_diff.queue[i]->two->oid);

  refname = *revision_sources_at(&revision_sources, commit);
  /*
   * FIXME: string_list_remove() below for each ref is overall
   * O(N^2).  Compared to a history walk and diffing trees, this is
   * just lost in the noise in practice.  However, theoretically a
   * repo may have enough refs for this to become slow.
   */
  string_list_remove(&extra_refs, refname, 0);
  if (anonymize) {
    refname = anonymize_refname(refname);
    anonymize_ident_line(&committer, &committer_end);
    anonymize_ident_line(&author, &author_end);
  }

  mark_next_object(&commit->object);
  if (anonymize) {
    reencoded = anonymize_commit_message();
  } else if (encoding) {
    switch(reencode_mode) {
    case REENCODE_YES:
      reencoded = reencode_string(message, "UTF-8", encoding);
      break;
    case REENCODE_NO:
      break;
    case REENCODE_ABORT:
      die("Encountered commit-specific encoding %s in commit "
          "%s; use --reencode=[yes|no] to handle it",
          encoding, oid_to_hex(&commit->object.oid));
    }
  }
  if (!commit->parents)
    printf("reset %s\n", refname);
  printf("commit %s\nmark :%"PRIu32"\n", refname, last_idnum);
  if (show_original_ids)
    printf("original-oid %s\n", oid_to_hex(&commit->object.oid));
  printf("%.*s\n%.*s\n",
         (int)(author_end - author), author,
         (int)(committer_end - committer), committer);
  if (!reencoded && encoding)
    printf("encoding %s\n", encoding);
  printf("data %u\n%s",
         (unsigned)(reencoded
        ? strlen(reencoded) : message
        ? strlen(message) : 0),
         reencoded ? reencoded : message ? message : "");
  free(reencoded);
  repo_unuse_commit_buffer(the_repository, commit, commit_buffer);

  for (i = 0, p = commit->parents; p; p = p->next) {
    struct object *obj = &p->item->object;
    int mark = get_object_mark(obj);

    if (!mark && !reference_excluded_commits)
      continue;
    if (i == 0)
      printf("from ");
    else
      printf("merge ");
    if (mark)
      printf(":%d\n", mark);
    else
      printf("%s\n",
             anonymize ?
             anonymize_oid(oid_to_hex(&obj->oid)) :
             oid_to_hex(&obj->oid));
    i++;
  }

  if (full_tree)
    printf("deleteall\n");
  log_tree_diff_flush(rev);
  string_list_clear(paths_of_changed_objects, 0);
  rev->diffopt.output_format = saved_output_format;

  printf("\n");

  show_progress();
}

static char *anonymize_tag(void)
{
  static int counter;
  struct strbuf out = STRBUF_INIT;
  strbuf_addf(&out, "tag message %d", counter++);
  return strbuf_detach(&out, NULL);
}


static void handle_tag(const char *name, struct tag *tag)
{
  unsigned long size;
  enum object_type type;
  char *buf;
  const char *tagger, *tagger_end, *message;
  size_t message_size = 0;
  struct object *tagged;
  int tagged_mark;
  struct commit *p;

  /* Trees have no identifier in fast-export output, thus we have no way
   * to output tags of trees, tags of tags of trees, etc.  Simply omit
   * such tags.
   */
  tagged = tag->tagged;
  while (tagged->type == OBJ_TAG) {
    tagged = ((struct tag *)tagged)->tagged;
  }
  if (tagged->type == OBJ_TREE) {
    warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
      oid_to_hex(&tag->object.oid));
    return;
  }

  buf = repo_read_object_file(the_repository, &tag->object.oid, &type,
            &size);
  if (!buf)
    die("could not read tag %s", oid_to_hex(&tag->object.oid));
  message = memmem(buf, size, "\n\n", 2);
  if (message) {
    message += 2;
    message_size = strlen(message);
  }
  tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
  if (!tagger) {
    if (fake_missing_tagger)
      tagger = "tagger Unspecified Tagger "
        "<unspecified-tagger> 0 +0000";
    else
      tagger = "";
    tagger_end = tagger + strlen(tagger);
  } else {
    tagger++;
    tagger_end = strchrnul(tagger, '\n');
    if (anonymize)
      anonymize_ident_line(&tagger, &tagger_end);
  }

  if (anonymize) {
    name = anonymize_refname(name);
    if (message) {
      static struct hashmap tags;
      message = anonymize_str(&tags, anonymize_tag,
            message, message_size);
      message_size = strlen(message);
    }
  }

  /* handle signed tags */
  if (message) {
    const char *signature = strstr(message,
                 "\n-----BEGIN PGP SIGNATURE-----\n");
    if (signature)
      switch(signed_tag_mode) {
      case SIGNED_TAG_ABORT:
        die("encountered signed tag %s; use "
            "--signed-tags=<mode> to handle it",
            oid_to_hex(&tag->object.oid));
      case WARN:
        warning("exporting signed tag %s",
          oid_to_hex(&tag->object.oid));
        /* fallthru */
      case VERBATIM:
        break;
      case WARN_STRIP:
        warning("stripping signature from tag %s",
          oid_to_hex(&tag->object.oid));
        /* fallthru */
      case STRIP:
        message_size = signature + 1 - message;
        break;
      }
  }

  /* handle tag->tagged having been filtered out due to paths specified */
  tagged = tag->tagged;
  tagged_mark = get_object_mark(tagged);
  if (!tagged_mark) {
    switch(tag_of_filtered_mode) {
    case TAG_FILTERING_ABORT:
      die("tag %s tags unexported object; use "
          "--tag-of-filtered-object=<mode> to handle it",
          oid_to_hex(&tag->object.oid));
    case DROP:
      /* Ignore this tag altogether */
      free(buf);
      return;
    case REWRITE:
      if (tagged->type == OBJ_TAG && !mark_tags) {
        die(_("Error: Cannot export nested tags unless --mark-tags is specified."));
      } else if (tagged->type == OBJ_COMMIT) {
        p = rewrite_commit((struct commit *)tagged);
        if (!p) {
          printf("reset %s\nfrom %s\n\n",
                 name, oid_to_hex(null_oid()));
          free(buf);
          return;
        }
        tagged_mark = get_object_mark(&p->object);
      } else {
        /* tagged->type is either OBJ_BLOB or OBJ_TAG */
        tagged_mark = get_object_mark(tagged);
      }
    }
  }

  if (tagged->type == OBJ_TAG) {
    printf("reset %s\nfrom %s\n\n",
           name, oid_to_hex(null_oid()));
  }
  skip_prefix(name, "refs/tags/", &name);
  printf("tag %s\n", name);
  if (mark_tags) {
    mark_next_object(&tag->object);
    printf("mark :%"PRIu32"\n", last_idnum);
  }
  if (tagged_mark)
    printf("from :%d\n", tagged_mark);
  else
    printf("from %s\n", oid_to_hex(&tagged->oid));

  if (show_original_ids)
    printf("original-oid %s\n", oid_to_hex(&tag->object.oid));
  printf("%.*s%sdata %d\n%.*s\n",
         (int)(tagger_end - tagger), tagger,
         tagger == tagger_end ? "" : "\n",
         (int)message_size, (int)message_size, message ? message : "");
  free(buf);
}

static struct commit *get_commit(struct rev_cmdline_entry *e, const char *full_name)
{
  switch (e->item->type) {
  case OBJ_COMMIT:
    return (struct commit *)e->item;
  case OBJ_TAG: {
    struct tag *tag = (struct tag *)e->item;

    /* handle nested tags */
    while (tag && tag->object.type == OBJ_TAG) {
      parse_object(the_repository, &tag->object.oid);
      string_list_append(&tag_refs, full_name)->util = tag;
      tag = (struct tag *)tag->tagged;
    }
    if (!tag)
      die("Tag %s points nowhere?", e->name);
    return (struct commit *)tag;
  }
  default:
    return NULL;
  }
}

static void get_tags_and_duplicates(struct rev_cmdline_info *info)
{
  int i;

  for (i = 0; i < info->nr; i++) {
    struct rev_cmdline_entry *e = info->rev + i;
    struct object_id oid;
    struct commit *commit;
    char *full_name = NULL;

    if (e->flags & UNINTERESTING)
      continue;

    if (repo_dwim_ref(the_repository, e->name, strlen(e->name),
          &oid, &full_name, 0) != 1) {
      free(full_name);
      continue;
    }

    if (refspecs.nr) {
      char *private;
      private = apply_refspecs(&refspecs, full_name);
      if (private) {
        free(full_name);
        full_name = private;
      }
    }

    commit = get_commit(e, full_name);
    if (!commit) {
      warning("%s: Unexpected object of type %s, skipping.",
        e->name,
        type_name(e->item->type));
      free(full_name);
      continue;
    }

    switch(commit->object.type) {
    case OBJ_COMMIT:
      break;
    case OBJ_BLOB:
      export_blob(&commit->object.oid);
      free(full_name);
      continue;
    default: /* OBJ_TAG (nested tags) is already handled */
      warning("Tag points to object of unexpected type %s, skipping.",
        type_name(commit->object.type));
      free(full_name);
      continue;
    }

    /*
     * Make sure this ref gets properly updated eventually, whether
     * through a commit or manually at the end.
     */
    if (e->item->type != OBJ_TAG)
      string_list_append(&extra_refs, full_name)->util = commit;

    if (!*revision_sources_at(&revision_sources, commit))
      *revision_sources_at(&revision_sources, commit) = full_name;
    else
      free(full_name);
  }

  string_list_sort(&extra_refs);
  string_list_remove_duplicates(&extra_refs, 0);
}

static void handle_tags_and_duplicates(struct string_list *extras)
{
  struct commit *commit;
  int i;

  for (i = extras->nr - 1; i >= 0; i--) {
    const char *name = extras->items[i].string;
    struct object *object = extras->items[i].util;
    int mark;

    switch (object->type) {
    case OBJ_TAG:
      handle_tag(name, (struct tag *)object);
      break;
    case OBJ_COMMIT:
      if (anonymize)
        name = anonymize_refname(name);
      /* create refs pointing to already seen commits */
      commit = rewrite_commit((struct commit *)object);
      if (!commit) {
        /*
         * Neither this object nor any of its
         * ancestors touch any relevant paths, so
         * it has been filtered to nothing.  Delete
         * it.
         */
        printf("reset %s\nfrom %s\n\n",
               name, oid_to_hex(null_oid()));
        continue;
      }

      mark = get_object_mark(&commit->object);
      if (!mark) {
        /*
         * Getting here means we have a commit which
         * was excluded by a negative refspec (e.g.
         * fast-export ^HEAD HEAD).  If we are
         * referencing excluded commits, set the ref
         * to the exact commit.  Otherwise, the user
         * wants the branch exported but every commit
         * in its history to be deleted, which basically
         * just means deletion of the ref.
         */
        if (!reference_excluded_commits) {
          /* delete the ref */
          printf("reset %s\nfrom %s\n\n",
                 name, oid_to_hex(null_oid()));
          continue;
        }
        /* set ref to commit using oid, not mark */
        printf("reset %s\nfrom %s\n\n", name,
               oid_to_hex(&commit->object.oid));
        continue;
      }

      printf("reset %s\nfrom :%d\n\n", name, mark
             );
      show_progress();
      break;
    }
  }
}

static void export_marks(char *file)
{
  unsigned int i;
  uint32_t mark;
  struct decoration_entry *deco = idnums.entries;
  FILE *f;
  int e = 0;

  f = fopen_for_writing(file);
  if (!f)
    die_errno("Unable to open marks file %s for writing.", file);

  for (i = 0; i < idnums.size; i++) {
    if (deco->base && deco->base->type == 1) {
      mark = ptr_to_mark(deco->decoration);
      if (fprintf(f, ":%"PRIu32" %s\n", mark,
        oid_to_hex(&deco->base->oid)) < 0) {
          e = 1;
          break;
      }
    }
    deco++;
  }

  e |= ferror(f);
  e |= fclose(f);
  if (e)
    error("Unable to write marks file %s.", file);
}

static void import_marks(char *input_file, int check_exists)
{
  char line[512];
  FILE *f;
  struct stat sb;

  if (check_exists && stat(input_file, &sb))
    return;

  f = xfopen(input_file, "r");
  while (fgets(line, sizeof(line), f)) {
    uint32_t mark;
    char *line_end, *mark_end;
    struct object_id oid;
    struct object *object;
    struct commit *commit;
    enum object_type type;

    line_end = strchr(line, '\n');
    if (line[0] != ':' || !line_end)
      die("corrupt mark line: %s", line);
    *line_end = '\0';

    mark = strtoumax(line + 1, &mark_end, 10);
    if (!mark || mark_end == line + 1
      || *mark_end != ' ' || get_oid_hex(mark_end + 1, &oid))
      die("corrupt mark line: %s", line);

    if (last_idnum < mark)
      last_idnum = mark;

    type = oid_object_info(the_repository, &oid, NULL);
    if (type < 0)
      die("object not found: %s", oid_to_hex(&oid));

    if (type != OBJ_COMMIT)
      /* only commits */
      continue;

    commit = lookup_commit(the_repository, &oid);
    if (!commit)
      die("not a commit? can't happen: %s", oid_to_hex(&oid));

    object = &commit->object;

    if (object->flags & SHOWN)
      error("Object %s already has a mark", oid_to_hex(&oid));

    mark_object(object, mark);

    object->flags |= SHOWN;
  }
  fclose(f);
}

static void handle_deletes(void)
{
  int i;
  for (i = 0; i < refspecs.nr; i++) {
    struct refspec_item *refspec = &refspecs.items[i];
    if (*refspec->src)
      continue;

    printf("reset %s\nfrom %s\n\n",
        refspec->dst, oid_to_hex(null_oid()));
  }
}

static int parse_opt_anonymize_map(const struct option *opt,
           const char *arg, int unset)
{
  struct hashmap *map = opt->value;
  const char *delim, *value;
  size_t keylen;

  BUG_ON_OPT_NEG(unset);

  delim = strchr(arg, ':');
  if (delim) {
    keylen = delim - arg;
    value = delim + 1;
  } else {
    keylen = strlen(arg);
    value = arg;
  }

  if (!keylen || !*value)
    return error(_("--anonymize-map token cannot be empty"));

  add_anonymized_entry(map, memhash(arg, keylen), arg, keylen,
           xstrdup(value));

  return 0;
}

int cmd_fast_export(int argc, const char **argv, const char *prefix)
{
  struct rev_info revs;
  struct commit *commit;
  char *export_filename = NULL,
       *import_filename = NULL,
       *import_filename_if_exists = NULL;
  uint32_t lastimportid;
  struct string_list refspecs_list = STRING_LIST_INIT_NODUP;
  struct string_list paths_of_changed_objects = STRING_LIST_INIT_DUP;
  struct option options[] = {
    OPT_INTEGER(0, "progress", &progress,
          N_("show progress after <n> objects")),
    OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
           N_("select handling of signed tags"),
           parse_opt_signed_tag_mode),
    OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
           N_("select handling of tags that tag filtered objects"),
           parse_opt_tag_of_filtered_mode),
    OPT_CALLBACK(0, "reencode", &reencode_mode, N_("mode"),
           N_("select handling of commit messages in an alternate encoding"),
           parse_opt_reencode_mode),
    OPT_STRING(0, "export-marks", &export_filename, N_("file"),
           N_("dump marks to this file")),
    OPT_STRING(0, "import-marks", &import_filename, N_("file"),
           N_("import marks from this file")),
    OPT_STRING(0, "import-marks-if-exists",
           &import_filename_if_exists,
           N_("file"),
           N_("import marks from this file if it exists")),
    OPT_BOOL(0, "fake-missing-tagger", &fake_missing_tagger,
       N_("fake a tagger when tags lack one")),
    OPT_BOOL(0, "full-tree", &full_tree,
       N_("output full tree for each commit")),
    OPT_BOOL(0, "use-done-feature", &use_done_feature,
           N_("use the done feature to terminate the stream")),
    OPT_BOOL(0, "no-data", &no_data, N_("skip output of blob data")),
    OPT_STRING_LIST(0, "refspec", &refspecs_list, N_("refspec"),
           N_("apply refspec to exported refs")),
    OPT_BOOL(0, "anonymize", &anonymize, N_("anonymize output")),
    OPT_CALLBACK_F(0, "anonymize-map", &anonymized_seeds, N_("from:to"),
             N_("convert <from> to <to> in anonymized output"),
             PARSE_OPT_NONEG, parse_opt_anonymize_map),
    OPT_BOOL(0, "reference-excluded-parents",
       &reference_excluded_commits, N_("reference parents which are not in fast-export stream by object id")),
    OPT_BOOL(0, "show-original-ids", &show_original_ids,
          N_("show original object ids of blobs/commits")),
    OPT_BOOL(0, "mark-tags", &mark_tags,
          N_("label tags with mark ids")),

    OPT_END()
  };

  if (argc == 1)
    usage_with_options (fast_export_usage, options);

  /* we handle encodings */
  git_config(git_default_config, NULL);

  repo_init_revisions(the_repository, &revs, prefix);
  init_revision_sources(&revision_sources);
  revs.topo_order = 1;
  revs.sources = &revision_sources;
  revs.rewrite_parents = 1;
  argc = parse_options(argc, argv, prefix, options, fast_export_usage,
      PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN_OPT);
  argc = setup_revisions(argc, argv, &revs, NULL);
  if (argc > 1)
    usage_with_options (fast_export_usage, options);

  if (anonymized_seeds.cmpfn && !anonymize)
    die(_("the option '%s' requires '%s'"), "--anonymize-map", "--anonymize");

  if (refspecs_list.nr) {
    int i;

    for (i = 0; i < refspecs_list.nr; i++)
      refspec_append(&refspecs, refspecs_list.items[i].string);

    string_list_clear(&refspecs_list, 1);
  }

  if (use_done_feature)
    printf("feature done\n");

  if (import_filename && import_filename_if_exists)
    die(_("options '%s' and '%s' cannot be used together"), "--import-marks", "--import-marks-if-exists");
  if (import_filename)
    import_marks(import_filename, 0);
  else if (import_filename_if_exists)
    import_marks(import_filename_if_exists, 1);
  lastimportid = last_idnum;

  if (import_filename && revs.prune_data.nr)
    full_tree = 1;

  get_tags_and_duplicates(&revs.cmdline);

  if (prepare_revision_walk(&revs))
    die("revision walk setup failed");

  revs.reverse = 1;
  revs.diffopt.format_callback = show_filemodify;
  revs.diffopt.format_callback_data = &paths_of_changed_objects;
  revs.diffopt.flags.recursive = 1;

  revs.diffopt.no_free = 1;
  while ((commit = get_revision(&revs)))
    handle_commit(commit, &revs, &paths_of_changed_objects);
  revs.diffopt.no_free = 0;

  handle_tags_and_duplicates(&extra_refs);
  handle_tags_and_duplicates(&tag_refs);
  handle_deletes();

  if (export_filename && lastimportid != last_idnum)
    export_marks(export_filename);

  if (use_done_feature)
    printf("done\n");

  refspec_clear(&refspecs);
  release_revisions(&revs);

  return 0;
}

Coverage Report

Created: 2024-09-08 06:23