svn-fast-export.c

   1 /*
   2  * svn-fast-export.c
   3  * ----------
   4  *  Walk through each revision of a local Subversion repository and export it
   5  *  in a stream that git-fast-import can consume.
   6  *
   7  * Author: Chris Lee <clee@kde.org>
   8  * License: MIT <http://www.opensource.org/licenses/mit-license.php>
   9  */
  10
  11 #define _XOPEN_SOURCE
  12 #include <unistd.h>
  13 #include <string.h>
  14 #include <stdio.h>
  15 #include <time.h>
  16
  17 #ifndef PATH_MAX
  18 #define PATH_MAX 4096
  19 #endif
  20
  21 #include <apr_lib.h>
  22 #include <apr_getopt.h>
  23 #include <apr_general.h>
  24
  25 #include <svn_fs.h>
  26 #include <svn_pools.h>
  27 #include <svn_types.h>
  28
  29 #undef SVN_ERR
  30 #define SVN_ERR(expr) SVN_INT_ERR(expr)
  31 #define apr_sane_push(arr, contents) *(char **)apr_array_push(arr) = contents
  32
  33 #define TRUNK "/trunk/"
  34
  35 time_t get_epoch(char *svn_date)
  36 {
  37     struct tm tm = {0};
  38     char *date = malloc(strlen(svn_date) * sizeof(char *));
  39     strncpy(date, svn_date, strlen(svn_date) - 8);
  40     strptime(date, "%Y-%m-%dT%H:%M:%S", &tm);
  41     free(date);
  42     return mktime(&tm);
  43 }
  44
  45 int dump_blob(svn_fs_root_t *root, char *full_path, apr_pool_t *pool)
  46 {
  47     apr_size_t     len;
  48     svn_stream_t   *stream, *outstream;
  49     svn_filesize_t stream_length;
  50
  51     SVN_ERR(svn_fs_file_length(&stream_length, root, full_path, pool));
  52     SVN_ERR(svn_fs_file_contents(&stream, root, full_path, pool));
  53
  54     fprintf(stdout, "data %lu\n", stream_length);
  55     fflush(stdout);
  56
  57     SVN_ERR(svn_stream_for_stdout(&outstream, pool));
  58     SVN_ERR(svn_stream_copy(stream, outstream, pool));
  59
  60     fprintf(stdout, "\n");
  61     fflush(stdout);
  62
  63     return 0;
  64 }
  65
  66 int export_revision(svn_revnum_t rev, svn_fs_t *fs, apr_pool_t *pool)
  67 {
  68     unsigned int         mark;
  69     const void           *key;
  70     void                 *val;
  71     char                 *path, *file_change;
  72     apr_pool_t           *revpool;
  73     apr_hash_t           *changes, *props;
  74     apr_hash_index_t     *i;
  75     apr_array_header_t   *file_changes;
  76     svn_string_t         *author, *committer, *svndate, *svnlog;
  77     svn_boolean_t        is_dir;
  78     svn_fs_root_t        *fs_root;
  79     svn_fs_path_change_t *change;
  80
  81     fprintf(stderr, "Exporting revision %ld... ", rev);
  82
  83     SVN_ERR(svn_fs_revision_root(&fs_root, fs, rev, pool));
  84     SVN_ERR(svn_fs_paths_changed(&changes, fs_root, pool));
  85     SVN_ERR(svn_fs_revision_proplist(&props, fs, rev, pool));
  86
  87     revpool = svn_pool_create(pool);
  88
  89     file_changes = apr_array_make(pool, apr_hash_count(changes), sizeof(char *));
  90     mark = 1;
  91     for (i = apr_hash_first(pool, changes); i; i = apr_hash_next(i)) {
  92         svn_pool_clear(revpool);
  93         apr_hash_this(i, &key, NULL, &val);
  94         path = (char *)key;
  95         change = (svn_fs_path_change_t *)val;
  96
  97         SVN_ERR(svn_fs_is_dir(&is_dir, fs_root, path, revpool));
  98
  99         if (is_dir || strncmp(TRUNK, path, strlen(TRUNK))) {
 100             continue;
 101         }
 102
 103         if (change->change_kind == svn_fs_path_change_delete) {
 104             apr_sane_push(file_changes, (char *)svn_string_createf(pool, "D %s", path + strlen(TRUNK))->data);
 105         } else {
 106             apr_sane_push(file_changes, (char *)svn_string_createf(pool, "M 644 :%u %s", mark, path + strlen(TRUNK))->data);
 107             fprintf(stdout, "blob\nmark :%u\n", mark++);
 108             dump_blob(fs_root, (char *)path, revpool);
 109         }
 110     }
 111
 112     if (file_changes->nelts == 0) {
 113         fprintf(stderr, "skipping.\n");
 114         svn_pool_destroy(revpool);
 115         return 0;
 116     }
 117
 118     author = apr_hash_get(props, "svn:author", APR_HASH_KEY_STRING);
 119     if (svn_string_isempty(author))
 120         author = svn_string_create("nobody", pool);
 121     svndate = apr_hash_get(props, "svn:date", APR_HASH_KEY_STRING);
 122     svnlog = apr_hash_get(props, "svn:log", APR_HASH_KEY_STRING);
 123
 124     fprintf(stdout, "commit refs/heads/master\n");
 125     fprintf(stdout, "committer %s <%s@localhost> %ld -0000\n", author->data, author->data, get_epoch((char *)svndate->data));
 126     fprintf(stdout, "data %d\n", svnlog->len);
 127     fputs(svnlog->data, stdout);
 128     fprintf(stdout, "\n");
 129     fputs(apr_array_pstrcat(pool, file_changes, '\n'), stdout);
 130     fprintf(stdout, "\n\n");
 131     fflush(stdout);
 132
 133     svn_pool_destroy(revpool);
 134
 135     fprintf(stderr, "done!\n");
 136
 137     return 0;
 138 }
 139
 140 int crawl_revisions(char *repos_path)
 141 {
 142     apr_pool_t   *pool, *subpool;
 143     svn_fs_t     *fs;
 144     svn_revnum_t youngest_rev, min_rev, max_rev, rev;
 145
 146     pool = svn_pool_create(NULL);
 147
 148     SVN_ERR(svn_fs_initialize(pool));
 149     SVN_ERR(svn_fs_open(&fs, repos_path, NULL, pool));
 150     SVN_ERR(svn_fs_youngest_rev(&youngest_rev, fs, pool));
 151
 152     min_rev = 1;
 153     max_rev = youngest_rev;
 154
 155     subpool = svn_pool_create(pool);
 156     for (rev = min_rev; rev <= max_rev; rev++) {
 157         svn_pool_clear(subpool);
 158         export_revision(rev, fs, subpool);
 159     }
 160
 161     svn_pool_destroy(pool);
 162
 163     return 0;
 164 }
 165
 166 int main(int argc, char *argv[])
 167 {
 168     if (argc != 2) {
 169         fprintf(stderr, "usage: %s REPOS_PATH\n", argv[0]);
 170         return -1;
 171     }
 172
 173     if (apr_initialize() != APR_SUCCESS) {
 174         fprintf(stderr, "You lose at apr_initialize().\n");
 175         return -1;
 176     }
 177
 178     crawl_revisions(argv[1]);
 179
 180     apr_terminate();
 181
 182     return 0;
 183 }