#define USE_THE_REPOSITORY_VARIABLE

#include "git-compat-util.h"

#include "abspath.h"

#include "config.h"

#include "convert.h"

#include "environment.h"

#include "gettext.h"

#include "hex.h"

#include "object-name.h"

#include "path.h"

#include "pretty.h"

#include "setup.h"

#include "refs.h"

#include "object-store-ll.h"

#include "commit.h"

#include "tree.h"

#include "tree-walk.h"

#include "attr.h"

#include "archive.h"

#include "parse-options.h"

#include "unpack-trees.h"

#include "quote.h"

static char const * const archive_usage[] = {

  N_("git archive [<options>] <tree-ish> [<path>...]"),

  "git archive --list",

  N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),

  N_("git archive --remote <repo> [--exec <cmd>] --list"),

  NULL

};

static const struct archiver **archivers;

static int nr_archivers;

static int alloc_archivers;

static int remote_allow_unreachable;

void register_archiver(struct archiver *ar)

{

  ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);

  archivers[nr_archivers++] = ar;

}

void init_archivers(void)

{

  init_tar_archiver();

  init_zip_archiver();

}

static void format_subst(const struct commit *commit,

       const char *src, size_t len,

       struct strbuf *buf, struct pretty_print_context *ctx)

{

  char *to_free = NULL;

  struct strbuf fmt = STRBUF_INIT;

  if (src == buf->buf)

    to_free = strbuf_detach(buf, NULL);

  for (;;) {

    const char *b, *c;

    b = memmem(src, len, "$Format:", 8);

    if (!b)

      break;

    c = memchr(b + 8, '$', (src + len) - b - 8);

    if (!c)

      break;

    strbuf_reset(&fmt);

    strbuf_add(&fmt, b + 8, c - b - 8);

    strbuf_add(buf, src, b - src);

    repo_format_commit_message(the_repository, commit, fmt.buf,

             buf, ctx);

    len -= c + 1 - src;

    src  = c + 1;

  }

  strbuf_add(buf, src, len);

  strbuf_release(&fmt);

  free(to_free);

}

static void *object_file_to_archive(const struct archiver_args *args,

            const char *path,

            const struct object_id *oid,

            unsigned int mode,

            enum object_type *type,

            unsigned long *sizep)

{

  void *buffer;

  const struct commit *commit = args->convert ? args->commit : NULL;

  struct checkout_metadata meta;

  init_checkout_metadata(&meta, args->refname,

             args->commit_oid ? args->commit_oid :

             (args->tree ? &args->tree->object.oid : NULL), oid);

  path += args->baselen;

  buffer = repo_read_object_file(the_repository, oid, type, sizep);

  if (buffer && S_ISREG(mode)) {

    struct strbuf buf = STRBUF_INIT;

    size_t size = 0;

    strbuf_attach(&buf, buffer, *sizep, *sizep + 1);

    convert_to_working_tree(args->repo->index, path, buf.buf, buf.len, &buf, &meta);

    if (commit)

      format_subst(commit, buf.buf, buf.len, &buf, args->pretty_ctx);

    buffer = strbuf_detach(&buf, &size);

    *sizep = size;

  }

  return buffer;

}

struct directory {

  struct directory *up;

  struct object_id oid;

  int baselen, len;

  unsigned mode;

  char path[FLEX_ARRAY];

};

struct archiver_context {

  struct archiver_args *args;

  write_archive_entry_fn_t write_entry;

  struct directory *bottom;

};

static const struct attr_check *get_archive_attrs(struct index_state *istate,

              const char *path)

{

  static struct attr_check *check;

  if (!check)

    check = attr_check_initl("export-ignore", "export-subst", NULL);

  git_check_attr(istate, path, check);

  return check;

}

static int check_attr_export_ignore(const struct attr_check *check)

{

  return check && ATTR_TRUE(check->items[0].value);

}

static int check_attr_export_subst(const struct attr_check *check)

{

  return check && ATTR_TRUE(check->items[1].value);

}

static int write_archive_entry(const struct object_id *oid, const char *base,

    int baselen, const char *filename, unsigned mode,

    void *context)

{

  static struct strbuf path = STRBUF_INIT;

  struct archiver_context *c = context;

  struct archiver_args *args = c->args;

  write_archive_entry_fn_t write_entry = c->write_entry;

  int err;

  const char *path_without_prefix;

  unsigned long size;

  void *buffer;

  enum object_type type;

  args->convert = 0;

  strbuf_reset(&path);

  strbuf_grow(&path, PATH_MAX);

  strbuf_add(&path, args->base, args->baselen);

  strbuf_add(&path, base, baselen);

  strbuf_addstr(&path, filename);

  if (S_ISDIR(mode) || S_ISGITLINK(mode))

    strbuf_addch(&path, '/');

  path_without_prefix = path.buf + args->baselen;

  if (!S_ISDIR(mode)) {

    const struct attr_check *check;

    check = get_archive_attrs(args->repo->index, path_without_prefix);

    if (check_attr_export_ignore(check))

      return 0;

    args->convert = check_attr_export_subst(check);

  }

  if (args->prefix) {

    static struct strbuf new_path = STRBUF_INIT;

    static struct strbuf buf = STRBUF_INIT;

    const char *rel;

    rel = relative_path(path_without_prefix, args->prefix, &buf);

    /*

     * We don't add an entry for the current working

     * directory when we are at the root; skip it also when

     * we're in a subdirectory or submodule.  Skip entries

     * higher up as well.

     */

    if (!strcmp(rel, "./") || starts_with(rel, "../"))

      return S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0;

    /* rel can refer to path, so don't edit it in place */

    strbuf_reset(&new_path);

    strbuf_add(&new_path, args->base, args->baselen);

    strbuf_addstr(&new_path, rel);

    strbuf_swap(&path, &new_path);

  }

  if (args->verbose)

    fprintf(stderr, "%.*s\n", (int)path.len, path.buf);

  if (S_ISDIR(mode) || S_ISGITLINK(mode)) {

    err = write_entry(args, oid, path.buf, path.len, mode, NULL, 0);

    if (err)

      return err;

    return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);

  }

  /* Stream it? */

  if (S_ISREG(mode) && !args->convert &&

      oid_object_info(args->repo, oid, &size) == OBJ_BLOB &&

      size > big_file_threshold)

    return write_entry(args, oid, path.buf, path.len, mode, NULL, size);

  buffer = object_file_to_archive(args, path.buf, oid, mode, &type, &size);

  if (!buffer)

    return error(_("cannot read '%s'"), oid_to_hex(oid));

  err = write_entry(args, oid, path.buf, path.len, mode, buffer, size);

  free(buffer);

  return err;

}

static void queue_directory(const struct object_id *oid,

    struct strbuf *base, const char *filename,

    unsigned mode, struct archiver_context *c)

{

  struct directory *d;

  size_t len = st_add4(base->len, 1, strlen(filename), 1);

  d = xmalloc(st_add(sizeof(*d), len));

  d->up    = c->bottom;

  d->baselen = base->len;

  d->mode    = mode;

  c->bottom  = d;

  d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);

  oidcpy(&d->oid, oid);

}

static int write_directory(struct archiver_context *c)

{

  struct directory *d = c->bottom;

  int ret;

  if (!d)

    return 0;

  c->bottom = d->up;

  d->path[d->len - 1] = '\0'; /* no trailing slash */

  ret =

    write_directory(c) ||

    write_archive_entry(&d->oid, d->path, d->baselen,

            d->path + d->baselen, d->mode,

            c) != READ_TREE_RECURSIVE;

  free(d);

  return ret ? -1 : 0;

}

static int queue_or_write_archive_entry(const struct object_id *oid,

    struct strbuf *base, const char *filename,

    unsigned mode, void *context)

{

  struct archiver_context *c = context;

  while (c->bottom &&

         !(base->len >= c->bottom->len &&

     !strncmp(base->buf, c->bottom->path, c->bottom->len))) {

    struct directory *next = c->bottom->up;

    free(c->bottom);

    c->bottom = next;

  }

  if (S_ISDIR(mode)) {

    size_t baselen = base->len;

    const struct attr_check *check;

    /* Borrow base, but restore its original value when done. */

    strbuf_addstr(base, filename);

    strbuf_addch(base, '/');

    check = get_archive_attrs(c->args->repo->index, base->buf);

    strbuf_setlen(base, baselen);

    if (check_attr_export_ignore(check))

      return 0;

    queue_directory(oid, base, filename, mode, c);

    return READ_TREE_RECURSIVE;

  }

  if (write_directory(c))

    return -1;

  return write_archive_entry(oid, base->buf, base->len, filename, mode,

           context);

}

struct extra_file_info {

  char *base;

  struct stat stat;

  void *content;

};

int write_archive_entries(struct archiver_args *args,

    write_archive_entry_fn_t write_entry)

{

  struct archiver_context context;

  struct unpack_trees_options opts;

  struct tree_desc t;

  int err;

  struct strbuf path_in_archive = STRBUF_INIT;

  struct strbuf content = STRBUF_INIT;

  struct object_id fake_oid;

  int i;

  oidcpy(&fake_oid, null_oid());

  if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {

    size_t len = args->baselen;

    while (len > 1 && args->base[len - 2] == '/')

      len--;

    if (args->verbose)

      fprintf(stderr, "%.*s\n", (int)len, args->base);

    err = write_entry(args, &args->tree->object.oid, args->base,

          len, 040777, NULL, 0);

    if (err)

      return err;

  }

  memset(&context, 0, sizeof(context));

  context.args = args;

  context.write_entry = write_entry;

  /*

   * Setup index and instruct attr to read index only

   */

  if (!args->worktree_attributes) {

    memset(&opts, 0, sizeof(opts));

    opts.index_only = 1;

    opts.head_idx = -1;

    opts.src_index = args->repo->index;

    opts.dst_index = args->repo->index;

    opts.fn = oneway_merge;

    init_tree_desc(&t, &args->tree->object.oid,

             args->tree->buffer, args->tree->size);

    if (unpack_trees(1, &t, &opts))

      return -1;

    git_attr_set_direction(GIT_ATTR_INDEX);

  }

  err = read_tree(args->repo, args->tree,

      &args->pathspec,

      queue_or_write_archive_entry,

      &context);

  if (err == READ_TREE_RECURSIVE)

    err = 0;

  while (context.bottom) {

    struct directory *next = context.bottom->up;

    free(context.bottom);

    context.bottom = next;

  }

  for (i = 0; i < args->extra_files.nr; i++) {

    struct string_list_item *item = args->extra_files.items + i;

    char *path = item->string;

    struct extra_file_info *info = item->util;

    put_be64(fake_oid.hash, i + 1);

    if (!info->content) {

      strbuf_reset(&path_in_archive);

      if (info->base)

        strbuf_addstr(&path_in_archive, info->base);

      strbuf_addstr(&path_in_archive, basename(path));

      strbuf_reset(&content);

      if (strbuf_read_file(&content, path, info->stat.st_size) < 0)

        err = error_errno(_("cannot read '%s'"), path);

      else

        err = write_entry(args, &fake_oid, path_in_archive.buf,

              path_in_archive.len,

              canon_mode(info->stat.st_mode),

              content.buf, content.len);

    } else {

      err = write_entry(args, &fake_oid,

            path, strlen(path),

            canon_mode(info->stat.st_mode),

            info->content, info->stat.st_size);

    }

    if (err)

      break;

  }

  strbuf_release(&path_in_archive);

  strbuf_release(&content);

  return err;

}

static const struct archiver *lookup_archiver(const char *name)

{

  int i;

  if (!name)

    return NULL;

  for (i = 0; i < nr_archivers; i++) {

    if (!strcmp(name, archivers[i]->name))

      return archivers[i];

  }

  return NULL;

}

struct path_exists_context {

  struct pathspec pathspec;

  struct archiver_args *args;

};

static int reject_entry(const struct object_id *oid UNUSED,

      struct strbuf *base,

      const char *filename, unsigned mode,

      void *context)

{

  int ret = -1;

  struct path_exists_context *ctx = context;

  if (S_ISDIR(mode)) {

    struct strbuf sb = STRBUF_INIT;

    strbuf_addbuf(&sb, base);

    strbuf_addstr(&sb, filename);

    if (!match_pathspec(ctx->args->repo->index,

            &ctx->pathspec,

            sb.buf, sb.len, 0, NULL, 1))

      ret = READ_TREE_RECURSIVE;

    strbuf_release(&sb);

  }

  return ret;

}

static int reject_outside(const struct object_id *oid UNUSED,

        struct strbuf *base, const char *filename,

        unsigned mode, void *context)

{

  struct archiver_args *args = context;

  struct strbuf buf = STRBUF_INIT;

  struct strbuf path = STRBUF_INIT;

  int ret = 0;

  if (S_ISDIR(mode))

    return READ_TREE_RECURSIVE;

  strbuf_addbuf(&path, base);

  strbuf_addstr(&path, filename);

  if (starts_with(relative_path(path.buf, args->prefix, &buf), "../"))

    ret = -1;

  strbuf_release(&buf);

  strbuf_release(&path);

  return ret;

}

static int path_exists(struct archiver_args *args, const char *path)

{

  const char *paths[] = { path, NULL };

  struct path_exists_context ctx;

  int ret;

  ctx.args = args;

  parse_pathspec(&ctx.pathspec, 0, PATHSPEC_PREFER_CWD,

           args->prefix, paths);

  ctx.pathspec.recursive = 1;

  if (args->prefix && read_tree(args->repo, args->tree, &ctx.pathspec,

              reject_outside, args))

    die(_("pathspec '%s' matches files outside the "

          "current directory"), path);

  ret = read_tree(args->repo, args->tree,

      &ctx.pathspec,

      reject_entry, &ctx);

  clear_pathspec(&ctx.pathspec);

  return ret != 0;

}

static void parse_pathspec_arg(const char **pathspec,

    struct archiver_args *ar_args)

{

  /*

   * must be consistent with parse_pathspec in path_exists()

   * Also if pathspec patterns are dependent, we're in big

   * trouble as we test each one separately

   */

  parse_pathspec(&ar_args->pathspec, 0, PATHSPEC_PREFER_CWD,

           ar_args->prefix, pathspec);

  ar_args->pathspec.recursive = 1;

  if (pathspec) {

    while (*pathspec) {

      if (**pathspec && !path_exists(ar_args, *pathspec))

        die(_("pathspec '%s' did not match any files"), *pathspec);

      pathspec++;

    }

  }

}

static void parse_treeish_arg(const char **argv,

            struct archiver_args *ar_args, int remote)

{

  const char *name = argv[0];

  const struct object_id *commit_oid;

  time_t archive_time;

  struct tree *tree;

  const struct commit *commit;

  struct object_id oid;

  char *ref = NULL;

  /* Remotes are only allowed to fetch actual refs */

  if (remote && !remote_allow_unreachable) {

    const char *colon = strchrnul(name, ':');

    int refnamelen = colon - name;

    if (!repo_dwim_ref(the_repository, name, refnamelen, &oid, &ref, 0))

      die(_("no such ref: %.*s"), refnamelen, name);

  } else {

    repo_dwim_ref(the_repository, name, strlen(name), &oid, &ref,

            0);

  }

  if (repo_get_oid(the_repository, name, &oid))

    die(_("not a valid object name: %s"), name);

  commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);

  if (commit) {

    commit_oid = &commit->object.oid;

    archive_time = commit->date;

  } else {

    commit_oid = NULL;

    archive_time = time(NULL);

  }

  if (ar_args->mtime_option)

    archive_time = approxidate(ar_args->mtime_option);

  tree = parse_tree_indirect(&oid);

  if (!tree)

    die(_("not a tree object: %s"), oid_to_hex(&oid));

  ar_args->refname = ref;

  ar_args->tree = tree;

  ar_args->commit_oid = commit_oid;

  ar_args->commit = commit;

  ar_args->time = archive_time;

}

static void extra_file_info_clear(void *util, const char *str UNUSED)

{

  struct extra_file_info *info = util;

  free(info->base);

  free(info->content);

  free(info);

}

static int add_file_cb(const struct option *opt, const char *arg, int unset)

{

  struct archiver_args *args = opt->value;

  const char **basep = (const char **)opt->defval;

  const char *base = *basep;

  char *path;

  struct string_list_item *item;

  struct extra_file_info *info;

  if (unset) {

    string_list_clear_func(&args->extra_files,

               extra_file_info_clear);

    return 0;

  }

  if (!arg)

    return -1;

  info = xmalloc(sizeof(*info));

  info->base = xstrdup_or_null(base);

  if (!strcmp(opt->long_name, "add-file")) {

    path = prefix_filename(args->prefix, arg);

    if (stat(path, &info->stat))

      die(_("File not found: %s"), path);

    if (!S_ISREG(info->stat.st_mode))

      die(_("Not a regular file: %s"), path);

    info->content = NULL; /* read the file later */

  } else if (!strcmp(opt->long_name, "add-virtual-file")) {

    struct strbuf buf = STRBUF_INIT;

    const char *p = arg;

    if (*p != '"')

      p = strchr(p, ':');

    else if (unquote_c_style(&buf, p, &p) < 0)

      die(_("unclosed quote: '%s'"), arg);

    if (!p || *p != ':')

      die(_("missing colon: '%s'"), arg);

    if (p == arg)

      die(_("empty file name: '%s'"), arg);

    path = buf.len ?

      strbuf_detach(&buf, NULL) : xstrndup(arg, p - arg);

    if (args->prefix) {

      char *save = path;

      path = prefix_filename(args->prefix, path);

      free(save);

    }

    memset(&info->stat, 0, sizeof(info->stat));

    info->stat.st_mode = S_IFREG | 0644;

    info->content = xstrdup(p + 1);

    info->stat.st_size = strlen(info->content);

  } else {

    BUG("add_file_cb() called for %s", opt->long_name);

  }

  item = string_list_append_nodup(&args->extra_files, path);

  item->util = info;

  return 0;

}

static int number_callback(const struct option *opt, const char *arg, int unset)

{

  BUG_ON_OPT_NEG(unset);

  *(int *)opt->value = strtol(arg, NULL, 10);

  return 0;

}

static int parse_archive_args(int argc, const char **argv,

    const struct archiver **ar, struct archiver_args *args,

    const char *name_hint, int is_remote)

{

  const char *format = NULL;

  const char *base = NULL;

  const char *remote = NULL;

  const char *exec = NULL;

  const char *output = NULL;

  const char *mtime_option = NULL;

  int compression_level = -1;

  int verbose = 0;

  int i;

  int list = 0;

  int worktree_attributes = 0;

  struct option opts[] = {

    OPT_GROUP(""),

    OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),

    OPT_STRING(0, "prefix", &base, N_("prefix"),

      N_("prepend prefix to each pathname in the archive")),

    { OPTION_CALLBACK, 0, "add-file", args, N_("file"),

      N_("add untracked file to archive"), 0, add_file_cb,

      (intptr_t)&base },

    { OPTION_CALLBACK, 0, "add-virtual-file", args,

      N_("path:content"), N_("add untracked file to archive"), 0,

      add_file_cb, (intptr_t)&base },

    OPT_STRING('o', "output", &output, N_("file"),

      N_("write the archive to this file")),

    OPT_BOOL(0, "worktree-attributes", &worktree_attributes,

      N_("read .gitattributes in working directory")),

    OPT__VERBOSE(&verbose, N_("report archived files on stderr")),

    { OPTION_STRING, 0, "mtime", &mtime_option, N_("time"),

      N_("set modification time of archive entries"),

      PARSE_OPT_NONEG },

    OPT_NUMBER_CALLBACK(&compression_level,

      N_("set compression level"), number_callback),

    OPT_GROUP(""),

    OPT_BOOL('l', "list", &list,

      N_("list supported archive formats")),

    OPT_GROUP(""),

    OPT_STRING(0, "remote", &remote, N_("repo"),

      N_("retrieve the archive from remote repository <repo>")),

    OPT_STRING(0, "exec", &exec, N_("command"),

      N_("path to the remote git-upload-archive command")),

    OPT_END()

  };

  argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);

  if (remote)

    die(_("Unexpected option --remote"));

  if (exec)

    die(_("the option '%s' requires '%s'"), "--exec", "--remote");

  if (output)

    die(_("Unexpected option --output"));

  if (is_remote && args->extra_files.nr)

    die(_("options '%s' and '%s' cannot be used together"), "--add-file", "--remote");

  if (!base)

    base = "";

  if (list) {

    if (argc)

      die(_("extra command line parameter '%s'"), *argv);

    for (i = 0; i < nr_archivers; i++)

      if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)

        printf("%s\n", archivers[i]->name);

    exit(0);

  }

  if (!format && name_hint)

    format = archive_format_from_filename(name_hint);

  if (!format)

    format = "tar";

  /* We need at least one parameter -- tree-ish */

  if (argc < 1)

    usage_with_options(archive_usage, opts);

  *ar = lookup_archiver(format);

  if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))

    die(_("Unknown archive format '%s'"), format);

  args->compression_level = Z_DEFAULT_COMPRESSION;

  if (compression_level != -1) {

    int levels_ok = (*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS;

    int high_ok = (*ar)->flags & ARCHIVER_HIGH_COMPRESSION_LEVELS;

    if (levels_ok && (compression_level <= 9 || high_ok))

      args->compression_level = compression_level;

    else {

      die(_("Argument not supported for format '%s': -%d"),

          format, compression_level);

    }

  }

  args->verbose = verbose;

  args->base = base;

  args->baselen = strlen(base);

  args->worktree_attributes = worktree_attributes;

  args->mtime_option = mtime_option;

  return argc;

}

int write_archive(int argc, const char **argv, const char *prefix,

      struct repository *repo,

      const char *name_hint, int remote)

{

  const struct archiver *ar = NULL;

  struct pretty_print_describe_status describe_status = {0};

  struct pretty_print_context ctx = {0};

  struct archiver_args args;

  const char **argv_copy;

  int rc;

  git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);

  git_config(git_default_config, NULL);

  describe_status.max_invocations = 1;

  ctx.date_mode.type = DATE_NORMAL;

  ctx.abbrev = DEFAULT_ABBREV;

  ctx.describe_status = &describe_status;

  args.pretty_ctx = &ctx;

  args.repo = repo;

  args.prefix = prefix;

  string_list_init_dup(&args.extra_files);

  /*

   * `parse_archive_args()` modifies contents of `argv`, which is what we

   * want. Our callers may not want it though, so we create a copy here.

   */

  DUP_ARRAY(argv_copy, argv, argc);

  argv = argv_copy;

  argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);

  if (!startup_info->have_repository) {

    /*

     * We know this will die() with an error, so we could just

     * die ourselves; but its error message will be more specific

     * than what we could write here.

     */

    setup_git_directory();

  }

  parse_treeish_arg(argv, &args, remote);

  parse_pathspec_arg(argv + 1, &args);

  rc = ar->write_archive(ar, &args);

  string_list_clear_func(&args.extra_files, extra_file_info_clear);

  free(args.refname);

  clear_pathspec(&args.pathspec);

  free(argv_copy);

  return rc;

}

static int match_extension(const char *filename, const char *ext)

{

  int prefixlen = strlen(filename) - strlen(ext);

  /*

   * We need 1 character for the '.', and 1 character to ensure that the

   * prefix is non-empty (k.e., we don't match .tar.gz with no actual

   * filename).

   */

  if (prefixlen < 2 || filename[prefixlen - 1] != '.')

    return 0;

  return !strcmp(filename + prefixlen, ext);

}

const char *archive_format_from_filename(const char *filename)

{

  int i;

  for (i = 0; i < nr_archivers; i++)

    if (match_extension(filename, archivers[i]->name))

      return archivers[i]->name;

  return NULL;

}