Subject: RE: [PATCH] Add svnrdump

From: "Bert Huijben" <[email-masked]>
Date: Thu, 8 Jul 2010 11:28:09 +0200

> -----Original Message-----
> From: Ramkumar Ramachandra [mailto:[email-masked]]
> Sent: donderdag 8 juli 2010 10:35
> To: [email-masked]
> Cc: Jonathan Nieder; Sverre Rabbelier; Git Mailing List
> Subject: [PATCH] Add svnrdump
> 
> Hi,
> 
> Kindly find the diff for svnrdump in the later part of this email. I
> haven't written a build.conf rule or manpage, but I suppose I can do
> them in another patch.
> 
> Thanks.
> 
> -- Ram
> 
> --------------------8<--------------->8-----------------------------
> 
> Index: subversion/svnrdump/dump_editor.c
> ===================================================================
> --- subversion/svnrdump/dump_editor.c	(revision 0)
> +++ subversion/svnrdump/dump_editor.c	(working copy)
> @@ -0,0 +1,689 @@
> +/*
> + *
> ====================================================================
> + *    Licensed to the Apache Software Foundation (ASF) under one
> + *    or more contributor license agreements.  See the NOTICE file
> + *    distributed with this work for additional information
> + *    regarding copyright ownership.  The ASF licenses this file
> + *    to you under the Apache License, Version 2.0 (the
> + *    "License"); you may not use this file except in compliance
> + *    with the License.  You may obtain a copy of the License at
> + *
> + *      http://www.apache.org/licenses/LICENSE-2.0
> + *
> + *    Unless required by applicable law or agreed to in writing,
> + *    software distributed under the License is distributed on an
> + *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
> + *    KIND, either express or implied.  See the License for the
> + *    specific language governing permissions and limitations
> + *    under the License.
> + *
> ====================================================================
> + */
> +
> +#include "svn_pools.h"
> +#include "svn_repos.h"
> +#include "svn_path.h"
> +#include "svn_props.h"
> +
> +#include "svnrdump.h"
> +#include "dump_editor.h"
> +
> +#define ARE_VALID_COPY_ARGS(p,r) ((p) && SVN_IS_VALID_REVNUM(r))
> +
> +svn_boolean_t must_dump_props = FALSE, must_dump_text = FALSE,
> +  dump_props_pending = FALSE;

You should use the editor baton for this to avoid global variables.

> +
> +/* Make a directory baton to represent the directory was path
> +   (relative to EDIT_BATON's path) is PATH.
> +
> +   CMP_PATH/CMP_REV are the path/revision against which this directory
> +   should be compared for changes.  If either is omitted (NULL for the
> +   path, SVN_INVALID_REVNUM for the rev), just compare this directory
> +   PATH against itself in the previous revision.
> +
> +   PARENT_DIR_BATON is the directory baton of this directory's parent,
> +   or NULL if this is the top-level directory of the edit.  ADDED
> +   indicated if this directory is newly added in this revision.
> +   Perform all allocations in POOL.  */
> +static struct dir_baton *
> +make_dir_baton(const char *path,
> +               const char *cmp_path,
> +               svn_revnum_t cmp_rev,
> +               void *edit_baton,
> +               void *parent_dir_baton,
> +               svn_boolean_t added,
> +               apr_pool_t *pool)
> +{
> +  struct dump_edit_baton *eb = edit_baton;
> +  struct dir_baton *pb = parent_dir_baton;
> +  struct dir_baton *new_db = apr_pcalloc(pool, sizeof(*new_db));
> +  const char *full_path;
> +  apr_array_header_t *compose_path = apr_array_make(pool, 2,
> sizeof(const char *));
> +
> +  /* A path relative to nothing?  I don't think so. */
> +  SVN_ERR_ASSERT_NO_RETURN(!path || pb);
> +
> +  /* Construct the full path of this node. */
> +  if (pb) {
> +    APR_ARRAY_PUSH(compose_path, const char *) = "/";
> +    APR_ARRAY_PUSH(compose_path, const char *) = path;
> +    full_path = svn_path_compose(compose_path, pool);
> +  }
> +  else
> +    full_path = apr_pstrdup(pool, "/");
> +
> +  /* Remove leading slashes from copyfrom paths. */
> +  if (cmp_path)
> +    cmp_path = ((*cmp_path == '/') ? cmp_path + 1 : cmp_path);
> +
> +  new_db->eb = eb;
> +  new_db->parent_dir_baton = pb;
> +  new_db->path = full_path;
> +  new_db->cmp_path = cmp_path ? apr_pstrdup(pool, cmp_path) : NULL;
> +  new_db->cmp_rev = cmp_rev;
> +  new_db->added = added;
> +  new_db->written_out = FALSE;
> +  new_db->deleted_entries = apr_hash_make(pool);
> +  new_db->pool = pool;
> +
> +  return new_db;
> +}
> +/*
> + * Write out a node record for PATH of type KIND under EB->FS_ROOT.
> + * ACTION describes what is happening to the node (see enum
> svn_node_action).
> + * Write record to writable EB->STREAM, using EB->BUFFER to write in
> chunks.
> + *
> + * If the node was itself copied, IS_COPY is TRUE and the
> + * path/revision of the copy source are in CMP_PATH/CMP_REV.  If
> + * IS_COPY is FALSE, yet CMP_PATH/CMP_REV are valid, this node is part
> + * of a copied subtree.
> + */
> +static svn_error_t *
> +dump_node(struct dump_edit_baton *eb,
> +          const char *path,    /* an absolute path. */
> +          svn_node_kind_t kind,
> +          enum svn_node_action action,
> +          const char *cmp_path,
> +          svn_revnum_t cmp_rev,
> +          apr_pool_t *pool)
> +{
> +  /* Write out metadata headers for this file node. */
> +  SVN_ERR(svn_stream_printf(eb->stream, pool,
> +          SVN_REPOS_DUMPFILE_NODE_PATH ": %s\n",
> +          (*path == '/') ? path + 1 : path));
> +
> +  if (kind == svn_node_file)
> +    SVN_ERR(svn_stream_printf(eb->stream, pool,
> +                              SVN_REPOS_DUMPFILE_NODE_KIND ":
> file\n"));
> +  else if (kind == svn_node_dir)
> +    SVN_ERR(svn_stream_printf(eb->stream, pool,
> +                              SVN_REPOS_DUMPFILE_NODE_KIND ":
> dir\n"));
> +
> +  /* Remove leading slashes from copyfrom paths. */
> +  if (cmp_path)
> +    cmp_path = ((*cmp_path == '/') ? cmp_path + 1 : cmp_path);
> +
> +  switch (action) {
> +    /* Appropriately handle the four svn_node_action actions */
> +
> +  case svn_node_action_change:
> +    SVN_ERR(svn_stream_printf(eb->stream, pool,
> +                              SVN_REPOS_DUMPFILE_NODE_ACTION
> +                              ": change\n"));
> +    break;
> +
> +  case svn_node_action_replace:
> +    if (!eb->is_copy) {
> +      /* a simple delete+add, implied by a single 'replace' action. */
> +      SVN_ERR(svn_stream_printf(eb->stream, pool,
> +                                SVN_REPOS_DUMPFILE_NODE_ACTION
> +                                ": replace\n"));
> +
> +      dump_props_pending = TRUE;
> +      break;
> +    }
> +    /* More complex case: eb->is_copy is true, and
> +       cmp_path/ cmp_rev are present: delete the original,
> +       and then re-add it */
> +
> +    /* the path & kind headers have already been printed;  just
> +       add a delete action, and end the current record.*/
> +    SVN_ERR(svn_stream_printf(eb->stream, pool,
> +                              SVN_REPOS_DUMPFILE_NODE_ACTION
> +                              ": delete\n\n"));
> +
> +    /* recurse:  print an additional add-with-history record. */
> +    SVN_ERR(dump_node(eb, path, kind, svn_node_action_add,
> +                      cmp_path, cmp_rev, pool));
> +
> +    /* we can leave this routine quietly now, don't need to dump
> +       any content;  that was already done in the second record. */
> +    must_dump_props = FALSE;
> +    eb->is_copy = FALSE;
> +    break;
> +
> +  case svn_node_action_delete:
> +    SVN_ERR(svn_stream_printf(eb->stream, pool,
> +                              SVN_REPOS_DUMPFILE_NODE_ACTION
> +                              ": delete\n"));
> +
> +    /* we can leave this routine quietly now, don't need to dump
> +       any content. */
> +    SVN_ERR(svn_stream_printf(eb->stream, pool, "\n\n"));
> +    must_dump_props = FALSE;
> +    break;
> +
> +  case svn_node_action_add:
> +    SVN_ERR(svn_stream_printf(eb->stream, pool,
> +                              SVN_REPOS_DUMPFILE_NODE_ACTION ":
> add\n"));
> +
> +    if (!eb->is_copy) {
> +      /* dump_props_pending for files is handled in
> +         close_file which is called immediately.
> +         However, directories are not closed until
> +         all the work inside them have been done;
> +         dump_props_pending for directories is
> +         handled in all the functions that can
> +         possibly be called after add_directory:
> +         add_directory, open_directory,
> +         delete_entry, close_directory, add_file,
> +         open_file and change_dir_prop;
> +         change_dir_prop is a special case
> +         ofcourse */
> +
> +      dump_props_pending = TRUE;
> +      break;
> +    }
> +
> +    SVN_ERR(svn_stream_printf(eb->stream, pool,
> +                              SVN_REPOS_DUMPFILE_NODE_COPYFROM_REV
> +                              ": %ld\n"
> +                              SVN_REPOS_DUMPFILE_NODE_COPYFROM_PATH
> +                              ": %s\n",
> +                              cmp_rev, cmp_path));
> +
> +    /* Dump the text only if apply_textdelta sets
> +       must_dump_text */
> +
> +    /* UGLY hack: If a directory was copied from a
> +       previous revision, nothing else can be done, and
> +       close_file won't be called to write two blank
> +       lines; write them here */
> +    if (kind == svn_node_dir)
> +      SVN_ERR(svn_stream_printf(eb->stream, pool, "\n\n"));
> +
> +    eb->is_copy = FALSE;
> +
> +    break;
> +  }
> +
> +  /* Dump property headers */
> +  SVN_ERR(dump_props(eb, &must_dump_props, FALSE, pool));
> +
> +  return SVN_NO_ERROR;
> +}
> +
> +svn_error_t *open_root(void *edit_baton,
> +                       svn_revnum_t base_revision,
> +                       apr_pool_t *pool,
> +                       void **root_baton)

Static and the return type on its own line.
> +{
> +  /* Allocate a special pool for the edit_baton to avoid pool
> +     lifetime issues */
> +  struct dump_edit_baton *eb = edit_baton;
> +  eb->pool = svn_pool_create(pool);
> +  eb->properties = apr_hash_make(eb->pool);
> +  eb->del_properties = apr_hash_make(eb->pool);
> +  eb->propstring = svn_stringbuf_create("", eb->pool);
> +  eb->is_copy = FALSE;
> +
> +  *root_baton = make_dir_baton(NULL, NULL, SVN_INVALID_REVNUM,
> +                               edit_baton, NULL, FALSE, pool);
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +delete_entry(const char *path,
> +             svn_revnum_t revision,
> +             void *parent_baton,
> +             apr_pool_t *pool)
> +{
> +  struct dir_baton *pb = parent_baton;
> +  const char *mypath = apr_pstrdup(pb->pool, path);
> +
> +  /* Some pending properties to dump? */
> +  SVN_ERR(dump_props(pb->eb, &dump_props_pending, TRUE, pool));
> +
> +  /* remember this path needs to be deleted */
> +  apr_hash_set(pb->deleted_entries, mypath, APR_HASH_KEY_STRING, pb);
> +
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +add_directory(const char *path,
> +              void *parent_baton,
> +              const char *copyfrom_path,
> +              svn_revnum_t copyfrom_rev,
> +              apr_pool_t *pool,
> +              void **child_baton)
> +{
> +  struct dir_baton *pb = parent_baton;
> +  void *val;
> +  struct dir_baton *new_db
> +    = make_dir_baton(path, copyfrom_path, copyfrom_rev, pb->eb, pb,
> TRUE, pool);
> +
> +  /* Some pending properties to dump? */
> +  SVN_ERR(dump_props(pb->eb, &dump_props_pending, TRUE, pool));
> +
> +  /* This might be a replacement -- is the path already deleted? */
> +  val = apr_hash_get(pb->deleted_entries, path, APR_HASH_KEY_STRING);
> +
> +  /* Detect an add-with-history */
> +  pb->eb->is_copy = ARE_VALID_COPY_ARGS(copyfrom_path, copyfrom_rev);
> +
> +  /* Dump the node */
> +  SVN_ERR(dump_node(pb->eb, path,
> +                    svn_node_dir,
> +                    val ? svn_node_action_replace :
> svn_node_action_add,
> +                    pb->eb->is_copy ? copyfrom_path : NULL,
> +                    pb->eb->is_copy ? copyfrom_rev :
> SVN_INVALID_REVNUM,
> +                    pool));
> +
> +  if (val)
> +    /* Delete the path, it's now been dumped */
> +    apr_hash_set(pb->deleted_entries, path, APR_HASH_KEY_STRING,
> NULL);
> +
> +  new_db->written_out = TRUE;
> +
> +  *child_baton = new_db;
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +open_directory(const char *path,
> +               void *parent_baton,
> +               svn_revnum_t base_revision,
> +               apr_pool_t *pool,
> +               void **child_baton)
> +{
> +  struct dir_baton *pb = parent_baton;
> +  struct dir_baton *new_db;
> +  const char *cmp_path = NULL;
> +  svn_revnum_t cmp_rev = SVN_INVALID_REVNUM;
> +  apr_array_header_t *compose_path = apr_array_make(pool, 2,
> sizeof(const char *));

This looks like more than 80 characters to me.
> +
> +  /* Some pending properties to dump? */
> +  SVN_ERR(dump_props(pb->eb, &dump_props_pending, TRUE, pool));
> +
> +  /* If the parent directory has explicit comparison path and rev,
> +     record the same for this one. */
> +  if (pb && ARE_VALID_COPY_ARGS(pb->cmp_path, pb->cmp_rev)) {
> +    APR_ARRAY_PUSH(compose_path, const char *) = pb->cmp_path;
> +    APR_ARRAY_PUSH(compose_path, const char *) =
> svn_dirent_basename(path, pool);
> +    cmp_path = svn_path_compose(compose_path, pool);
> +    cmp_rev = pb->cmp_rev;
> +  }
> +
> +  new_db = make_dir_baton(path, cmp_path, cmp_rev, pb->eb, pb, FALSE,
> pool);
> +  *child_baton = new_db;
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +close_directory(void *dir_baton,
> +                apr_pool_t *pool)
> +{
> +  struct dir_baton *db = dir_baton;
> +  struct dump_edit_baton *eb = db->eb;
> +  apr_hash_index_t *hi;
> +  apr_pool_t *subpool = svn_pool_create(pool);
> +
> +  /* Some pending properties to dump? */
> +  SVN_ERR(dump_props(eb, &dump_props_pending, TRUE, pool));
> +
> +  /* Dump the directory entries */
> +  for (hi = apr_hash_first(pool, db->deleted_entries); hi;
> +       hi = apr_hash_next(hi)) {
> +    const void *key;
> +    const char *path;
> +    apr_hash_this(hi, &key, NULL, NULL);
> +    path = key;
> +
> +    svn_pool_clear(subpool);
> +
> +    SVN_ERR(dump_node(db->eb, path,
> +                      svn_node_unknown, svn_node_action_delete,
> +                      NULL, SVN_INVALID_REVNUM, subpool));
> +  }
> +
> +  svn_pool_destroy(subpool);
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +add_file(const char *path,
> +         void *parent_baton,
> +         const char *copyfrom_path,
> +         svn_revnum_t copyfrom_rev,
> +         apr_pool_t *pool,
> +         void **file_baton)
> +{
> +  struct dir_baton *pb = parent_baton;
> +  void *val;
> +
> +  /* Some pending properties to dump? */
> +  SVN_ERR(dump_props(pb->eb, &dump_props_pending, TRUE, pool));
> +
> +  /* This might be a replacement -- is the path already deleted? */
> +  val = apr_hash_get(pb->deleted_entries, path, APR_HASH_KEY_STRING);
> +
> +  /* Detect add-with-history. */
> +  pb->eb->is_copy = ARE_VALID_COPY_ARGS(copyfrom_path, copyfrom_rev);
> +
> +  /* Dump the node. */
> +  SVN_ERR(dump_node(pb->eb, path,
> +                    svn_node_file,
> +                    val ? svn_node_action_replace :
> svn_node_action_add,
> +                    pb->eb->is_copy ? copyfrom_path : NULL,
> +                    pb->eb->is_copy ? copyfrom_rev :
> SVN_INVALID_REVNUM,
> +                    pool));
> +
> +  if (val)
> +    /* delete the path, it's now been dumped. */
> +    apr_hash_set(pb->deleted_entries, path, APR_HASH_KEY_STRING,
> NULL);
> +
> +  /* Build a nice file baton to pass to change_file_prop and
> apply_textdelta */
> +  pb->eb->changed_path = path;
> +  *file_baton = pb->eb;
> +
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +open_file(const char *path,
> +          void *parent_baton,
> +          svn_revnum_t ancestor_revision,
> +          apr_pool_t *pool,
> +          void **file_baton)
> +{
> +  struct dir_baton *pb = parent_baton;
> +  const char *cmp_path = NULL;
> +  svn_revnum_t cmp_rev = SVN_INVALID_REVNUM;
> +
> +  /* Some pending properties to dump? */
> +  SVN_ERR(dump_props(pb->eb, &dump_props_pending, TRUE, pool));
> +
> +  apr_array_header_t *compose_path = apr_array_make(pool, 2,
> sizeof(const char *));
> +  /* If the parent directory has explicit comparison path and rev,
> +     record the same for this one. */
> +  if (pb && ARE_VALID_COPY_ARGS(pb->cmp_path, pb->cmp_rev)) {
> +    APR_ARRAY_PUSH(compose_path, const char *) = pb->cmp_path;
> +    APR_ARRAY_PUSH(compose_path, const char *) =
> svn_dirent_basename(path, pool);

Assuming that the path doesn't start with a '/' here, this should be
svn_relent_basename() to avoid platform specific path rules.

> +    cmp_path = svn_path_compose(compose_path, pool);
> +    cmp_rev = pb->cmp_rev;
> +  }
> +
> +  SVN_ERR(dump_node(pb->eb, path,
> +                    svn_node_file, svn_node_action_change,
> +                    cmp_path, cmp_rev, pool));
> +
> +  /* Build a nice file baton to pass to change_file_prop and
> apply_textdelta */
> +  pb->eb->changed_path = path;
> +  *file_baton = pb->eb;
> +
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +change_dir_prop(void *parent_baton,
> +                const char *name,
> +                const svn_string_t *value,
> +                apr_pool_t *pool)
> +{
> +  struct dir_baton *db = parent_baton;
> +
> +  if (svn_property_kind(NULL, name) != svn_prop_regular_kind)
> +    return SVN_NO_ERROR;
> +
> +  value ? apr_hash_set(db->eb->properties, apr_pstrdup(pool, name),
> +                       APR_HASH_KEY_STRING, svn_string_dup(value,
> pool)) :
> +    apr_hash_set(db->eb->del_properties, apr_pstrdup(pool, name),
> +                 APR_HASH_KEY_STRING, (void *)0x1);
> +
> +  /* This function is what distinguishes between a directory that is
> +     opened to merely get somewhere, vs. one that is opened because it
> +     actually changed by itself  */
> +  if (! db->written_out) {
> +    /* If dump_props_pending was set, it means that the
> +       node information corresponding to add_directory has already
> +       been written; just don't unset it and dump_node will dump
> +       the properties before doing anything else. If it wasn't
> +       set, node information hasn't been written yet: so dump the
> +       node itself before dumping the props */
> +
> +    SVN_ERR(dump_node(db->eb, db->path,
> +                      svn_node_dir, svn_node_action_change,
> +                      db->cmp_path, db->cmp_rev, pool));
> +
> +    SVN_ERR(dump_props(db->eb, NULL, TRUE, pool));
> +    db->written_out = TRUE;
> +  }
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +change_file_prop(void *file_baton,
> +                 const char *name,
> +                 const svn_string_t *value,
> +                 apr_pool_t *pool)
> +{
> +  struct dump_edit_baton *eb = file_baton;
> +
> +  if (svn_property_kind(NULL, name) != svn_prop_regular_kind)
> +    return SVN_NO_ERROR;
> +
> +  apr_hash_set(eb->properties, apr_pstrdup(pool, name),
> +               APR_HASH_KEY_STRING, value ?
> +               svn_string_dup(value, pool): (void *)0x1);
> +
> +  /* Dump the property headers and wait; close_file might need
> +     to write text headers too depending on whether
> +     apply_textdelta is called */
> +  dump_props_pending = TRUE;
> +
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +window_handler(svn_txdelta_window_t *window, void *baton)
> +{
> +  struct handler_baton *hb = baton;
> +  struct dump_edit_baton *eb = hb->eb;
> +  svn_error_t *err;
> +
> +  err = hb->apply_handler(window, hb->apply_baton);
> +  if (window != NULL && !err)
> +    return SVN_NO_ERROR;
> +
> +  if (err)
> +    SVN_ERR(err);
> +
> +  /* Write information about the filepath to hb->eb */
> +  eb->temp_filepath = apr_pstrdup(eb->pool,
> +          hb->temp_filepath);
> +
> +  /* Cleanup */
> +  SVN_ERR(svn_io_file_close(hb->temp_file, hb->pool));
> +  SVN_ERR(svn_stream_close(hb->temp_filestream));

The standard handler already closes the stream for you and if you don't
disown the file on mapping, this also closes the file.

> +  svn_pool_destroy(hb->pool);

And as you clear the pool that contains the file and stream here, closing
yourself is not necessary.

> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +apply_textdelta(void *file_baton, const char *base_checksum,
> +                apr_pool_t *pool,
> +                svn_txdelta_window_handler_t *handler,
> +                void **handler_baton)
> +{
> +  struct dump_edit_baton *eb = file_baton;
> +  apr_status_t apr_err;
> +  const char *tempdir;
> +
> +  /* Custom handler_baton allocated in a separate pool */
> +  apr_pool_t *handler_pool = svn_pool_create(pool);
> +  struct handler_baton *hb = apr_pcalloc(handler_pool, sizeof(*hb));
> +  hb->pool = handler_pool;
> +  hb->eb = eb;
> +
> +  /* Use a temporary file to measure the text-content-length */
> +  apr_err = apr_temp_dir_get(&tempdir, hb->pool);
> +  if (apr_err != APR_SUCCESS)
> +    SVN_ERR(svn_error_wrap_apr(apr_err, NULL));
> +
> +  hb->temp_filepath = apr_psprintf(eb->pool, "%s/svn-fe-XXXXXX",
> tempdir);

Why store this path in the editor pool? Do you really need this XXXX path to
live that long?

> +  apr_err = apr_file_mktemp(&(hb->temp_file), hb->temp_filepath,
> +          APR_CREATE | APR_READ | APR_WRITE | APR_EXCL,
> +          hb->pool);
> +  if (apr_err != APR_SUCCESS)
> +    SVN_ERR(svn_error_wrap_apr(apr_err, NULL));
> +
> +  hb->temp_filestream = svn_stream_from_aprfile2(hb->temp_file, TRUE,
> hb->pool);
> +
> +  /* Prepare to write the delta to the temporary file */
> +  svn_txdelta_to_svndiff2(&(hb->apply_handler), &(hb->apply_baton),
> +                          hb->temp_filestream, 0, hb->pool);
> +  must_dump_text = TRUE;
> +
> +  /* The actual writing takes place when this function has finished */
> +  /* Set the handler and handler_baton */
> +  *handler = window_handler;
> +  *handler_baton = hb;
> +
> +  return SVN_NO_ERROR;
> +}
> +
> +svn_error_t *
> +close_file(void *file_baton,
> +           const char *text_checksum,
> +           apr_pool_t *pool)
> +{
> +  struct dump_edit_baton *eb = file_baton;
> +  apr_file_t *temp_file;
> +  svn_stream_t *temp_filestream;
> +  apr_finfo_t *info = apr_pcalloc(pool, sizeof(apr_finfo_t));
> +
> +  /* We didn't write the property headers because we were
> +     waiting for file_prop_change; write them now */
> +  SVN_ERR(dump_props(eb, &dump_props_pending, FALSE, pool));
> +
> +  /* The prop headers have already been dumped in dump_node */
> +  /* Dump the text headers */
> +  if (must_dump_text) {
> +    /* text-delta header */
> +    SVN_ERR(svn_stream_printf(eb->stream, pool,
> +            SVN_REPOS_DUMPFILE_TEXT_DELTA
> +            ": true\n"));
> +
> +    /* Measure the length */
> +    SVN_ERR(svn_io_stat(info, eb->temp_filepath, APR_FINFO_SIZE,
> pool));
> +
> +    /* text-content-length header */
> +    SVN_ERR(svn_stream_printf(eb->stream, pool,
> +            SVN_REPOS_DUMPFILE_TEXT_CONTENT_LENGTH
> +            ": %lu\n",
> +            (unsigned long)info->size));
> +    /* text-content-md5 header */
> +    SVN_ERR(svn_stream_printf(eb->stream, pool,
> +            SVN_REPOS_DUMPFILE_TEXT_CONTENT_MD5
> +             ": %s\n",
> +            text_checksum));
> +  }
> +
> +  /* content-length header: if both text and props are absent,
> +     skip this block */
> +  if (must_dump_props || dump_props_pending)
> +    SVN_ERR(svn_stream_printf(eb->stream, pool,
> +            SVN_REPOS_DUMPFILE_CONTENT_LENGTH
> +            ": %ld\n\n",
> +            (unsigned long)info->size + eb->propstring->len));
> +  else if (must_dump_text)
> +    SVN_ERR(svn_stream_printf(eb->stream, pool,
> +            SVN_REPOS_DUMPFILE_CONTENT_LENGTH
> +            ": %ld\n\n",
> +            (unsigned long)info->size));
> +
> +  /* Dump the props; the propstring should have already been
> +     written in dump_node or above */
> +  if (must_dump_props || dump_props_pending) {
> +    SVN_ERR(svn_stream_write(eb->stream, eb->propstring->data,
> +           &(eb->propstring->len)));
> +
> +    /* Cleanup */
> +    must_dump_props = dump_props_pending = FALSE;
> +    apr_hash_clear(eb->properties);
> +    apr_hash_clear(eb->del_properties);
> +  }
> +
> +  /* Dump the text */
> +  if (must_dump_text) {
> +
> +    /* Open the temporary file, map it to a stream, copy
> +       the stream to eb->stream, close and delete the
> +       file */
> +    SVN_ERR(svn_io_file_open(&temp_file, eb->temp_filepath, APR_READ,
> 0600, pool));
> +    temp_filestream = svn_stream_from_aprfile2(temp_file, TRUE, pool);
> +    SVN_ERR(svn_stream_copy3(temp_filestream, eb->stream, NULL, NULL,
> pool));
> +
> +    /* Cleanup */
> +    SVN_ERR(svn_io_file_close(temp_file, pool));
> +    SVN_ERR(svn_stream_close(temp_filestream));
> +    SVN_ERR(svn_io_remove_file2(eb->temp_filepath, TRUE, pool));
> +    must_dump_text = FALSE;
> +  }
> +
> +  SVN_ERR(svn_stream_printf(eb->stream, pool, "\n\n"));
> +
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +close_edit(void *edit_baton, apr_pool_t *pool)
> +{
> +  struct dump_edit_baton *eb = edit_baton;
> +  svn_pool_destroy(eb->pool);
> +  (eb->current_rev) ++;
> +
> +  return SVN_NO_ERROR;
> +}
> +
> +svn_error_t *
> +get_dump_editor(const svn_delta_editor_t **editor,
> +                void **edit_baton,
> +                svn_revnum_t from_rev,
> +                apr_pool_t *pool)
> +{
> +  struct dump_edit_baton *eb = apr_pcalloc(pool, sizeof(struct
> dump_edit_baton));
> +  eb->current_rev = from_rev;
> +  SVN_ERR(svn_stream_for_stdout(&(eb->stream), pool));
> +  svn_delta_editor_t *de = svn_delta_default_editor(pool);
> +
> +  de->open_root = open_root;
> +  de->delete_entry = delete_entry;
> +  de->add_directory = add_directory;
> +  de->open_directory = open_directory;
> +  de->close_directory = close_directory;
> +  de->change_dir_prop = change_dir_prop;
> +  de->change_file_prop = change_file_prop;
> +  de->apply_textdelta = apply_textdelta;
> +  de->add_file = add_file;
> +  de->open_file = open_file;
> +  de->close_file = close_file;
> +  de->close_edit = close_edit;
> +
> +  /* Set the edit_baton and editor */
> +  *edit_baton = eb;
> +  *editor = de;
> +
> +  return SVN_NO_ERROR;
> +}
> +
> Index: subversion/svnrdump/dump_editor.h
> ===================================================================
> --- subversion/svnrdump/dump_editor.h	(revision 0)
> +++ subversion/svnrdump/dump_editor.h	(working copy)
> @@ -0,0 +1,99 @@
> +/*
> + *
> ====================================================================
> + *    Licensed to the Apache Software Foundation (ASF) under one
> + *    or more contributor license agreements.  See the NOTICE file
> + *    distributed with this work for additional information
> + *    regarding copyright ownership.  The ASF licenses this file
> + *    to you under the Apache License, Version 2.0 (the
> + *    "License"); you may not use this file except in compliance
> + *    with the License.  You may obtain a copy of the License at
> + *
> + *      http://www.apache.org/licenses/LICENSE-2.0
> + *
> + *    Unless required by applicable law or agreed to in writing,
> + *    software distributed under the License is distributed on an
> + *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
> + *    KIND, either express or implied.  See the License for the
> + *    specific language governing permissions and limitations
> + *    under the License.
> + *
> ====================================================================
> + */
> +
> +#ifndef DUMP_EDITOR_H_
> +#define DUMP_EDITOR_H_
> +
> +struct dump_edit_baton {
> +  svn_stream_t *stream;
> +  svn_revnum_t current_rev;
> +
> +  /* pool is for per-edit-session allocations */
> +  apr_pool_t *pool;
> +
> +  /* Store the properties that changed */
> +  apr_hash_t *properties;
> +  apr_hash_t *del_properties; /* Value is always 0x1 */
> +  svn_stringbuf_t *propstring;
> +
> +  /* Was a copy command issued? */
> +  svn_boolean_t is_copy;
> +
> +  /* Path of changed file */
> +  const char *changed_path;
> +
> +  /* Temporary file to write delta to along with its checksum */
> +  char *temp_filepath;
> +  svn_checksum_t *checksum;
> +};
> +
> +struct dir_baton {
> +  struct dump_edit_baton *eb;
> +  struct dir_baton *parent_dir_baton;
> +
> +  /* is this directory a new addition to this revision? */
> +  svn_boolean_t added;
> +
> +  /* has this directory been written to the output stream? */
> +  svn_boolean_t written_out;
> +
> +  /* the absolute path to this directory */
> +  const char *path;
> +
> +  /* the comparison path and revision of this directory.  if both of
> +     these are valid, use them as a source against which to compare
> +     the directory instead of the default comparison source of PATH in
> +     the previous revision. */
> +  const char *cmp_path;
> +  svn_revnum_t cmp_rev;
> +
> +  /* hash of paths that need to be deleted, though some -might- be
> +     replaced.  maps const char * paths to this dir_baton.  (they're
> +     full paths, because that's what the editor driver gives us.  but
> +     really, they're all within this directory.) */
> +  apr_hash_t *deleted_entries;
> +
> +  /* pool to be used for deleting the hash items */
> +  apr_pool_t *pool;
> +};
> +
> +struct handler_baton
> +{
> +  svn_txdelta_window_handler_t apply_handler;
> +  void *apply_baton;
> +  apr_pool_t *pool;
> +
> +  /* Information about the path of the tempoarary file used */
> +  char *temp_filepath;
> +  apr_file_t *temp_file;
> +  svn_stream_t *temp_filestream;
> +
> +  /* To fill in the edit baton fields */
> +  struct dump_edit_baton *eb;
> +};
> +
> +svn_error_t *
> +get_dump_editor(const svn_delta_editor_t **editor,
> +                void **edit_baton,
> +                svn_revnum_t to_rev,
> +                apr_pool_t *pool);

These structs and this function don't follow our naming guidelines for
libraries. But these functions are no reusable library (yet).

	Bert

(no comments in the rest of this mail)

> +
> +#endif
> Index: subversion/svnrdump/svnrdump.c
> ===================================================================
> --- subversion/svnrdump/svnrdump.c	(revision 0)
> +++ subversion/svnrdump/svnrdump.c	(working copy)
> @@ -0,0 +1,198 @@
> +/*
> + *
> ====================================================================
> + *    Licensed to the Apache Software Foundation (ASF) under one
> + *    or more contributor license agreements.  See the NOTICE file
> + *    distributed with this work for additional information
> + *    regarding copyright ownership.  The ASF licenses this file
> + *    to you under the Apache License, Version 2.0 (the
> + *    "License"); you may not use this file except in compliance
> + *    with the License.  You may obtain a copy of the License at
> + *
> + *      http://www.apache.org/licenses/LICENSE-2.0
> + *
> + *    Unless required by applicable law or agreed to in writing,
> + *    software distributed under the License is distributed on an
> + *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
> + *    KIND, either express or implied.  See the License for the
> + *    specific language governing permissions and limitations
> + *    under the License.
> + *
> ====================================================================
> + */
> +
> +#include "svn_pools.h"
> +#include "svn_cmdline.h"
> +#include "svn_client.h"
> +#include "svn_ra.h"
> +#include "svn_repos.h"
> +#include "svn_path.h"
> +
> +#include "svnrdump.h"
> +#include "dump_editor.h"
> +
> +static apr_pool_t *pool = NULL;
> +static svn_client_ctx_t *ctx = NULL;
> +static svn_ra_session_t *session = NULL;
> +
> +static svn_error_t *
> +replay_revstart(svn_revnum_t revision,
> +                void *replay_baton,
> +                const svn_delta_editor_t **editor,
> +                void **edit_baton,
> +                apr_hash_t *rev_props,
> +                apr_pool_t *pool)
> +{
> +  /* Editing this revision has just started; dump the revprops
> +     before invoking the editor callbacks */
> +  svn_stringbuf_t *propstring = svn_stringbuf_create("", pool);
> +  svn_stream_t *stdout_stream;
> +
> +  /* Create an stdout stream */
> +  svn_stream_for_stdout(&stdout_stream, pool);
> +
> +        /* Print revision number and prepare the propstring */
> +  SVN_ERR(svn_stream_printf(stdout_stream, pool,
> +          SVN_REPOS_DUMPFILE_REVISION_NUMBER
> +          ": %ld\n", revision));
> +  write_hash_to_stringbuf(rev_props, FALSE, &propstring, pool);
> +  svn_stringbuf_appendbytes(propstring, "PROPS-END\n", 10);
> +
> +  /* prop-content-length header */
> +  SVN_ERR(svn_stream_printf(stdout_stream, pool,
> +          SVN_REPOS_DUMPFILE_PROP_CONTENT_LENGTH
> +          ": %" APR_SIZE_T_FMT "\n", propstring->len));
> +
> +  /* content-length header */
> +  SVN_ERR(svn_stream_printf(stdout_stream, pool,
> +          SVN_REPOS_DUMPFILE_CONTENT_LENGTH
> +          ": %" APR_SIZE_T_FMT "\n\n", propstring->len));
> +
> +  /* Print the revprops now */
> +  SVN_ERR(svn_stream_write(stdout_stream, propstring->data,
> +         &(propstring->len)));
> +
> +  svn_stream_close(stdout_stream);
> +
> +  /* Extract editor and editor_baton from the replay_baton and
> +     set them so that the editor callbacks can use them */
> +  struct replay_baton *rb = replay_baton;
> +  *editor = rb->editor;
> +  *edit_baton = rb->edit_baton;
> +
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +replay_revend(svn_revnum_t revision,
> +              void *replay_baton,
> +              const svn_delta_editor_t *editor,
> +              void *edit_baton,
> +              apr_hash_t *rev_props,
> +              apr_pool_t *pool)
> +{
> +  /* Editor has finished for this revision and close_edit has
> +     been called; do nothing: just continue to the next
> +     revision */
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +open_connection(const char *url)
> +{
> +  SVN_ERR(svn_config_ensure (NULL, pool));
> +  SVN_ERR(svn_client_create_context (&ctx, pool));
> +  SVN_ERR(svn_ra_initialize(pool));
> +
> +  SVN_ERR(svn_config_get_config(&(ctx->config), NULL, pool));
> +
> +  /* Default authentication providers for non-interactive use */
> +  SVN_ERR(svn_cmdline_create_auth_baton(&(ctx->auth_baton), TRUE,
> +                NULL, NULL, NULL, FALSE,
> +                FALSE, NULL, NULL, NULL,
> +                pool));
> +  SVN_ERR(svn_client_open_ra_session(&session, url, ctx, pool));
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +replay_range(svn_revnum_t start_revision, svn_revnum_t end_revision)
> +{
> +  const svn_delta_editor_t *dump_editor;
> +  void *dump_baton;
> +
> +  SVN_ERR(get_dump_editor(&dump_editor,
> +                          &dump_baton, start_revision, pool));
> +
> +  struct replay_baton *replay_baton = apr_palloc(pool, sizeof(struct
> replay_baton));
> +  replay_baton->editor = dump_editor;
> +  replay_baton->edit_baton = dump_baton;
> +  SVN_ERR(svn_cmdline_printf(pool, SVN_REPOS_DUMPFILE_MAGIC_HEADER ":
> %d\n",
> +           SVN_REPOS_DUMPFILE_FORMAT_VERSION));
> +  SVN_ERR(svn_ra_replay_range(session, start_revision, end_revision,
> +                              0, TRUE, replay_revstart, replay_revend,
> +                              replay_baton, pool));
> +  return SVN_NO_ERROR;
> +}
> +
> +static svn_error_t *
> +usage(FILE *out_stream)
> +{
> +  fprintf(out_stream,
> +    "usage: svnrdump URL [-r LOWER[:UPPER]]\n\n"
> +    "Dump the contents of repository at remote URL to stdout in a
> 'dumpfile'\n"
> +    "v3 portable format.  Dump revisions LOWER rev through UPPER
> rev.\n"
> +    "LOWER defaults to 1 and UPPER defaults to the highest possible
> revision\n"
> +    "if omitted.\n");
> +  return SVN_NO_ERROR;
> +}
> +
> +int
> +main(int argc, const char **argv)
> +{
> +  int i;
> +  const char *url = NULL;
> +  char *revision_cut = NULL;
> +  svn_revnum_t start_revision = svn_opt_revision_unspecified;
> +  svn_revnum_t end_revision = svn_opt_revision_unspecified;
> +
> +  if (svn_cmdline_init ("svnrdump", stderr) != EXIT_SUCCESS)
> +    return EXIT_FAILURE;
> +
> +  pool = svn_pool_create(NULL);
> +
> +  for (i = 1; i < argc; i++) {
> +    if (!strncmp("-r", argv[i], 2)) {
> +      revision_cut = strchr(argv[i] + 2, ':');
> +      if (revision_cut) {
> +        start_revision = (svn_revnum_t) strtoul(argv[i] + 2,
> &revision_cut, 10);
> +        end_revision = (svn_revnum_t) strtoul(revision_cut + 1, NULL,
> 10);
> +      }
> +      else
> +        start_revision = (svn_revnum_t) strtoul(argv[i] + 2, NULL,
> 10);
> +    } else if (!strcmp("help", argv[i]) || !strcmp("--help", argv[i]))
> {
> +      SVN_INT_ERR(usage(stdout));
> +      return EXIT_SUCCESS;
> +    } else if (*argv[i] == '-' || url) {
> +      SVN_INT_ERR(usage(stderr));
> +      return EXIT_FAILURE;
> +    } else
> +      url = argv[i];
> +  }
> +
> +  if (!url || !svn_path_is_url(url)) {
> +    usage(stderr);
> +    return EXIT_FAILURE;
> +  }
> +  SVN_INT_ERR(open_connection(url));
> +
> +  /* Have sane start_revision and end_revision defaults if unspecified
> */
> +  if (start_revision == svn_opt_revision_unspecified)
> +    start_revision = 1;
> +  if (end_revision == svn_opt_revision_unspecified)
> +    SVN_INT_ERR(svn_ra_get_latest_revnum(session, &end_revision,
> pool));
> +
> +  SVN_INT_ERR(replay_range(start_revision, end_revision));
> +
> +  svn_pool_destroy(pool);
> +
> +  return 0;
> +}
> Index: subversion/svnrdump/svnrdump.h
> ===================================================================
> --- subversion/svnrdump/svnrdump.h	(revision 0)
> +++ subversion/svnrdump/svnrdump.h	(working copy)
> @@ -0,0 +1,44 @@
> +/*
> + *
> ====================================================================
> + *    Licensed to the Apache Software Foundation (ASF) under one
> + *    or more contributor license agreements.  See the NOTICE file
> + *    distributed with this work for additional information
> + *    regarding copyright ownership.  The ASF licenses this file
> + *    to you under the Apache License, Version 2.0 (the
> + *    "License"); you may not use this file except in compliance
> + *    with the License.  You may obtain a copy of the License at
> + *
> + *      http://www.apache.org/licenses/LICENSE-2.0
> + *
> + *    Unless required by applicable law or agreed to in writing,
> + *    software distributed under the License is distributed on an
> + *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
> + *    KIND, either express or implied.  See the License for the
> + *    specific language governing permissions and limitations
> + *    under the License.
> + *
> ====================================================================
> + */
> +
> +#ifndef SVNRDUMP_H_
> +#define SVNRDUMP_H_
> +
> +#include "dump_editor.h"
> +
> +struct replay_baton {
> +  const svn_delta_editor_t *editor;
> +  void *edit_baton;
> +};
> +
> +void
> +write_hash_to_stringbuf(apr_hash_t *properties,
> +                        svn_boolean_t deleted,
> +                        svn_stringbuf_t **strbuf,
> +                        apr_pool_t *pool);
> +
> +svn_error_t *
> +dump_props(struct dump_edit_baton *eb,
> +           svn_boolean_t *trigger_var,
> +           svn_boolean_t dump_data_too,
> +           apr_pool_t *pool);
> +
> +#endif
> Index: subversion/svnrdump/util.c
> ===================================================================
> --- subversion/svnrdump/util.c	(revision 0)
> +++ subversion/svnrdump/util.c	(working copy)
> @@ -0,0 +1,131 @@
> +/*
> + *
> ====================================================================
> + *    Licensed to the Apache Software Foundation (ASF) under one
> + *    or more contributor license agreements.  See the NOTICE file
> + *    distributed with this work for additional information
> + *    regarding copyright ownership.  The ASF licenses this file
> + *    to you under the Apache License, Version 2.0 (the
> + *    "License"); you may not use this file except in compliance
> + *    with the License.  You may obtain a copy of the License at
> + *
> + *      http://www.apache.org/licenses/LICENSE-2.0
> + *
> + *    Unless required by applicable law or agreed to in writing,
> + *    software distributed under the License is distributed on an
> + *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
> + *    KIND, either express or implied.  See the License for the
> + *    specific language governing permissions and limitations
> + *    under the License.
> + *
> ====================================================================
> + */
> +
> +#include "svn_pools.h"
> +#include "svn_cmdline.h"
> +#include "svn_client.h"
> +#include "svn_ra.h"
> +#include "svn_repos.h"
> +
> +#include "svnrdump.h"
> +
> +void
> +write_hash_to_stringbuf(apr_hash_t *properties,
> +                        svn_boolean_t deleted,
> +                        svn_stringbuf_t **strbuf,
> +                        apr_pool_t *pool)
> +{
> +  apr_hash_index_t *this;
> +  const void *key;
> +  void *val;
> +  apr_ssize_t keylen;
> +  svn_string_t *value;
> +
> +  if (!deleted) {
> +    for (this = apr_hash_first(pool, properties); this;
> +         this = apr_hash_next(this)) {
> +      /* Get this key and val. */
> +      apr_hash_this(this, &key, &keylen, &val);
> +      value = val;
> +
> +      /* Output name length, then name. */
> +      svn_stringbuf_appendcstr(*strbuf,
> +             apr_psprintf(pool, "K %" APR_SSIZE_T_FMT "\n",
> +                    keylen));
> +
> +      svn_stringbuf_appendbytes(*strbuf, (const char *) key, keylen);
> +      svn_stringbuf_appendbytes(*strbuf, "\n", 1);
> +
> +      /* Output value length, then value. */
> +      svn_stringbuf_appendcstr(*strbuf,
> +             apr_psprintf(pool, "V %" APR_SIZE_T_FMT "\n",
> +                    value->len));
> +
> +      svn_stringbuf_appendbytes(*strbuf, value->data, value->len);
> +      svn_stringbuf_appendbytes(*strbuf, "\n", 1);
> +    }
> +  }
> +  else {
> +    /* Output a "D " entry for each deleted property */
> +    for (this = apr_hash_first(pool, properties); this;
> +         this = apr_hash_next(this)) {
> +      /* Get this key */
> +      apr_hash_this(this, &key, &keylen, NULL);
> +
> +      /* Output name length, then name */
> +      svn_stringbuf_appendcstr(*strbuf,
> +             apr_psprintf(pool, "D %" APR_SSIZE_T_FMT "\n",
> +                    keylen));
> +
> +      svn_stringbuf_appendbytes(*strbuf, (const char *) key, keylen);
> +      svn_stringbuf_appendbytes(*strbuf, "\n", 1);
> +    }
> +  }
> +}
> +
> +svn_error_t *
> +dump_props(struct dump_edit_baton *eb,
> +           svn_boolean_t *trigger_var,
> +           svn_boolean_t dump_data_too,
> +           apr_pool_t *pool)
> +{
> +  if (trigger_var && !*trigger_var)
> +    return SVN_NO_ERROR;
> +
> +  /* Build a propstring to print */
> +  svn_stringbuf_setempty(eb->propstring);
> +  write_hash_to_stringbuf(eb->properties,
> +        FALSE,
> +        &(eb->propstring), eb->pool);
> +  write_hash_to_stringbuf(eb->del_properties,
> +        TRUE,
> +        &(eb->propstring), eb->pool);
> +  svn_stringbuf_appendbytes(eb->propstring, "PROPS-END\n", 10);
> +
> +  /* prop-delta header */
> +  SVN_ERR(svn_stream_printf(eb->stream, pool,
> +          SVN_REPOS_DUMPFILE_PROP_DELTA
> +          ": true\n"));
> +
> +  /* prop-content-length header */
> +  SVN_ERR(svn_stream_printf(eb->stream, pool,
> +          SVN_REPOS_DUMPFILE_PROP_CONTENT_LENGTH
> +          ": %" APR_SIZE_T_FMT "\n", eb->propstring->len));
> +
> +  if (dump_data_too) {
> +    /* content-length header */
> +    SVN_ERR(svn_stream_printf(eb->stream, pool,
> +            SVN_REPOS_DUMPFILE_CONTENT_LENGTH
> +            ": %" APR_SIZE_T_FMT "\n\n",
> +            eb->propstring->len));
> +
> +    /* the properties themselves */
> +    SVN_ERR(svn_stream_write(eb->stream, eb->propstring->data,
> +           &(eb->propstring->len)));
> +
> +    /* Cleanup so that data is never dumped twice */
> +    apr_hash_clear(eb->properties);
> +    apr_hash_clear(eb->del_properties);
> +    if (trigger_var)
> +      *trigger_var = FALSE;
> +  }
> +  return SVN_NO_ERROR;
> +}