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Overview
Comment:Fix a problem that can occasionally occur with repeated syncs to/from a git repository, where a fossil-generated mark clashes with a mark previously generated by git, causing the sync to fail.
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Timelines: family | ancestors | descendants | both | nick.lloyd-git-interop
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SHA1:69668f8c57a081b40ab195295326e42bd845a5fb
User & Date: nick.lloyd 2016-09-21 19:05:46
References
2016-10-08
14:06
Fix a regression introduced in [69668f8c57] that broke export of tags. Closed-Leaf check-in: b2e0fda9 user: nick.lloyd tags: nick.lloyd-git-interop
Context
2016-09-23
02:40
Merge updates from trunk. check-in: 98f4ee8f user: mistachkin tags: nick.lloyd-git-interop
2016-09-21
19:05
Fix a problem that can occasionally occur with repeated syncs to/from a git repository, where a fossil-generated mark clashes with a mark previously generated by git, causing the sync to fail. check-in: 69668f8c user: nick.lloyd tags: nick.lloyd-git-interop
16:06
Merge in latest from trunk check-in: 85a0ada6 user: nick.lloyd tags: nick.lloyd-git-interop
Changes
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Changes to src/export.c.

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  );
}

/*
** create_mark()
**   Create a new (mark,rid,uuid) entry for the given rid in the 'xmark' table,
**   and return that information as a struct mark_t in *mark.




**   This function returns -1 in the case where 'rid' does not exist, otherwise
**   it returns 0.
**   mark->name is dynamically allocated and is owned by the caller upon return.
*/
int create_mark(int rid, struct mark_t *mark){
  char sid[13];
  char *zUuid = rid_to_uuid(rid);
  if(!zUuid){
    fossil_trace("Undefined rid=%d\n", rid);
    return -1;
  }
  mark->rid = rid;
  sqlite3_snprintf(sizeof(sid), sid, ":%d", COMMITMARK(rid));

  mark->name = fossil_strdup(sid);
  sqlite3_snprintf(sizeof(mark->uuid), mark->uuid, "%s", zUuid);
  free(zUuid);
  insert_commit_xref(mark->rid, mark->name, mark->uuid);
  return 0;
}

/*
** mark_name_from_rid()
**   Find the mark associated with the given rid.  Mark names always start
**   with ':', and are pulled from the 'xmark' temporary table.



**   This function returns NULL if the rid does not exist in the 'xmark' table.
**   Otherwise, it returns the name of the mark, which is dynamically allocated
**   and is owned by the caller of this function.
*/
char * mark_name_from_rid(int rid){
  char *zMark = db_text(0, "SELECT tname FROM xmark WHERE trid=%d", rid);
  if(zMark==NULL){
    struct mark_t mark;
    if(create_mark(rid, &mark)==0){
      zMark = mark.name;
    }else{
      return NULL;
    }
  }
  return zMark;
}
................................................................................
**   This function returns -1 in the case that the line is blank, malformed, or
**   the rid/uuid named in 'line' does not match what is in the repository
**   database.  Otherwise, 0 is returned.
**   mark->name is dynamically allocated, and owned by the caller.
*/
int parse_mark(char *line, struct mark_t *mark){
  char *cur_tok;

  cur_tok = strtok(line, " \t");
  if(!cur_tok||strlen(cur_tok)<2){
    return -1;
  }
  mark->rid = atoi(&cur_tok[1]);
  if(cur_tok[0]!='c'){

    /* This is probably a blob mark */
    mark->name = NULL;
    return 0;
  }

  cur_tok = strtok(NULL, " \t");
  if(!cur_tok){
    /* This mark was generated by an older version of Fossil and doesn't
    ** include the mark name and uuid.  create_mark() will name the new mark
    ** exactly as it was when exported to git, so that we should have a
    ** valid mapping from git sha1<->mark name<->fossil sha1. */







    return create_mark(mark->rid, mark);
  }else{
    mark->name = fossil_strdup(cur_tok);
  }

  cur_tok = strtok(NULL, "\n");
  if(!cur_tok||strlen(cur_tok)!=40){
    free(mark->name);
................................................................................
}

/*
** import_marks()
**   Import the marks specified in file 'f' into the 'xmark' table.
**   If 'blobs' is non-null, insert all blob marks into it.
**   If 'vers' is non-null, insert all commit marks into it.



**   Each line in the file must be at most 100 characters in length.  This
**   seems like a reasonable maximum for a 40-character uuid, and 1-13
**   character rid.
**   The function returns -1 if any of the lines in file 'f' are malformed,
**   or the rid/uuid information doesn't match what is in the repository
**   database.  Otherwise, 0 is returned.
*/
int import_marks(FILE* f, Bag *blobs, Bag *vers){
  char line[101];
  while(fgets(line, sizeof(line), f)){
    struct mark_t mark;
    if(strlen(line)==100&&line[99]!='\n'){
      /* line too long */
      return -1;
    }
    if( parse_mark(line, &mark)<0 ){
      return -1;
    }else if( line[0]=='b' ){
      /* Don't import blob marks into 'xmark' table--git doesn't use them,
      ** so they need to be left free for git to reuse. */
      if(blobs!=NULL){
        bag_insert(blobs, mark.rid);
      }

    }else if( vers!=NULL ){
      bag_insert(vers, mark.rid);







    }
    free(mark.name);
  }
  return 0;
}


















/*
**  If 'blobs' is non-null, it must point to a Bag of blob rids to be
**  written to disk.  Blob rids are written as 'b<rid>'.
**  If 'vers' is non-null, it must point to a Bag of commit rids to be
**  written to disk.  Commit rids are written as 'c<rid> :<mark> <uuid>'.
**  All commit (mark,rid,uuid) tuples are stored in 'xmark' table.
**  This function does not fail, but may produce errors if a uuid cannot
**  be found for an rid in 'vers'.
*/
void export_marks(FILE* f, Bag *blobs, Bag *vers){
  int rid;

  if( blobs!=NULL ){
    rid = bag_first(blobs);
    if(rid!=0){
      do{
        fprintf(f, "b%d\n", rid);

      }while((rid = bag_next(blobs, rid))!=0);
    }
  }
  if( vers!=NULL ){
    rid = bag_first(vers);
    if( rid!=0 ){
      do{
        char *zUuid = rid_to_uuid(rid);
        char *zMark;
        if(zUuid==NULL){
          fossil_trace("No uuid matching rid=%d when exporting marks\n", rid);
          continue;
        }
        zMark = mark_name_from_rid(rid);
        fprintf(f, "c%d %s %s\n", rid, zMark, zUuid);
        free(zMark);
        free(zUuid);
      }while( (rid = bag_next(vers, rid))!=0 );
    }
  }
}

/*
** COMMAND: export
................................................................................
**
** See also: import
*/
void export_cmd(void){
  Stmt q, q2, q3;
  int i;
  Bag blobs, vers;

  const char *markfile_in;
  const char *markfile_out;

  bag_init(&blobs);
  bag_init(&vers);

  find_option("git", 0, 0);   /* Ignore the --git option for now */
................................................................................
    FILE *f;
    int rid;

    f = fossil_fopen(markfile_in, "r");
    if( f==0 ){
      fossil_fatal("cannot open %s for reading", markfile_in);
    }
    if(import_marks(f, &blobs, &vers)<0){
      fossil_fatal("error importing marks from file: %s\n", markfile_in);
    }
    db_prepare(&qb, "INSERT OR IGNORE INTO oldblob VALUES (:rid)");
    db_prepare(&qc, "INSERT OR IGNORE INTO oldcommit VALUES (:rid)");
    rid = bag_first(&blobs);
    if(rid!=0){
      do{
................................................................................
  db_prepare(&q2, "INSERT INTO oldblob VALUES (:rid)");
  db_prepare(&q3, "SELECT rid FROM newblob WHERE srcid= (:srcid)");
  while( db_step(&q)==SQLITE_ROW ){
    int rid = db_column_int(&q, 0);
    Blob content;

    while( !bag_find(&blobs, rid) ){

      content_get(rid, &content);
      db_bind_int(&q2, ":rid", rid);
      db_step(&q2);
      db_reset(&q2);
      printf("blob\nmark :%d\ndata %d\n", BLOBMARK(rid), blob_size(&content));


      bag_insert(&blobs, rid);
      fwrite(blob_buffer(&content), 1, blob_size(&content), stdout);
      printf("\n");
      blob_reset(&content);

      db_bind_int(&q3, ":srcid", rid);
      if( db_step(&q3) != SQLITE_ROW ){
................................................................................
    db_step(&q2);
    db_reset(&q2);
    if( zBranch==0 ) zBranch = "trunk";
    zBr = mprintf("%s", zBranch);
    for(i=0; zBr[i]; i++){
      if( !fossil_isalnum(zBr[i]) ) zBr[i] = '_';
    }
    zMark = mark_name_from_rid(ckinId);
    printf("commit refs/heads/%s\nmark %s\n", zBr, zMark);
    free(zMark);
    free(zBr);
    printf("committer");
    print_person(zUser);
    printf(" %s +0000\n", zSecondsSince1970);
    if( zComment==0 ) zComment = "null comment";
................................................................................
      "SELECT pid FROM plink"
      " WHERE cid=%d AND isprim"
      "   AND pid IN (SELECT objid FROM event)",
      ckinId
    );
    if( db_step(&q3) == SQLITE_ROW ){
      int pid = db_column_int(&q3, 0);
      zMark = mark_name_from_rid(pid);
      printf("from %s\n", zMark);
      free(zMark);
      db_prepare(&q4,
        "SELECT pid FROM plink"
        " WHERE cid=%d AND NOT isprim"
        "   AND NOT EXISTS(SELECT 1 FROM phantom WHERE rid=pid)"
        " ORDER BY pid",
        ckinId);
      while( db_step(&q4)==SQLITE_ROW ){
        zMark = mark_name_from_rid(db_column_int(&q4, 0));
        printf("merge %s\n", zMark);
        free(zMark);
      }
      db_finalize(&q4);
    }else{
      printf("deleteall\n");
    }
................................................................................
    while( db_step(&q4)==SQLITE_ROW ){
      const char *zName = db_column_text(&q4,0);
      int zNew = db_column_int(&q4,1);
      int mPerm = db_column_int(&q4,2);
      if( zNew==0)
        printf("D %s\n", zName);
      else if( bag_find(&blobs, zNew) ) {

        const char *zPerm;
        switch( mPerm ){
          case PERM_LNK:  zPerm = "120000";   break;
          case PERM_EXE:  zPerm = "100755";   break;
          default:        zPerm = "100644";   break;
        }
        printf("M %s :%d %s\n", zPerm, BLOBMARK(zNew), zName);

      }
    }
    db_finalize(&q4);
    db_finalize(&q3);
    printf("\n");
  }
  db_finalize(&q2);







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  );
}

/*
** create_mark()
**   Create a new (mark,rid,uuid) entry for the given rid in the 'xmark' table,
**   and return that information as a struct mark_t in *mark.
**   *unused_mark is a value representing a mark that is free for use--that is,
**   it does not appear in the marks file, and has not been used during this   
**   export run.  Specifically, it is the supremum of the set of used marks    
**   plus one.                                                                 
**   This function returns -1 in the case where 'rid' does not exist, otherwise
**   it returns 0.
**   mark->name is dynamically allocated and is owned by the caller upon return.
*/
int create_mark(int rid, struct mark_t *mark, unsigned int *unused_mark){
  char sid[13];
  char *zUuid = rid_to_uuid(rid);
  if(!zUuid){
    fossil_trace("Undefined rid=%d\n", rid);
    return -1;
  }
  mark->rid = rid;
  sqlite3_snprintf(sizeof(sid), sid, ":%d", *unused_mark);
  *unused_mark += 1;
  mark->name = fossil_strdup(sid);
  sqlite3_snprintf(sizeof(mark->uuid), mark->uuid, "%s", zUuid);
  free(zUuid);
  insert_commit_xref(mark->rid, mark->name, mark->uuid);
  return 0;
}

/*
** mark_name_from_rid()
**   Find the mark associated with the given rid.  Mark names always start
**   with ':', and are pulled from the 'xmark' temporary table.
**   If the given rid doesn't have a mark associated with it yet, one is
**   created with a value of *unused_mark.
**   *unused_mark functions exactly as in create_mark().
**   This function returns NULL if the rid does not have an associated UUID,
**   (i.e. is not valid).  Otherwise, it returns the name of the mark, which is
**   dynamically allocated and is owned by the caller of this function.
*/
char * mark_name_from_rid(int rid, unsigned int *unused_mark){
  char *zMark = db_text(0, "SELECT tname FROM xmark WHERE trid=%d", rid);
  if(zMark==NULL){
    struct mark_t mark;
    if(create_mark(rid, &mark, unused_mark)==0){
      zMark = mark.name;
    }else{
      return NULL;
    }
  }
  return zMark;
}
................................................................................
**   This function returns -1 in the case that the line is blank, malformed, or
**   the rid/uuid named in 'line' does not match what is in the repository
**   database.  Otherwise, 0 is returned.
**   mark->name is dynamically allocated, and owned by the caller.
*/
int parse_mark(char *line, struct mark_t *mark){
  char *cur_tok;
  char type_;
  cur_tok = strtok(line, " \t");
  if(!cur_tok||strlen(cur_tok)<2){
    return -1;
  }
  mark->rid = atoi(&cur_tok[1]);
  type_ = cur_tok[0];
  if(type_!='c'&&type_!='b'){
    /* This is probably a blob mark */
    mark->name = NULL;
    return 0;
  }

  cur_tok = strtok(NULL, " \t");
  if(!cur_tok){
    /* This mark was generated by an older version of Fossil and doesn't
    ** include the mark name and uuid.  create_mark() will name the new mark
    ** exactly as it was when exported to git, so that we should have a
    ** valid mapping from git sha1<->mark name<->fossil sha1. */
    unsigned int mid;
    if( type_=='c' ){
      mid = COMMITMARK(mark->rid);
    }
    else{
      mid = BLOBMARK(mark->rid);
    }
    return create_mark(mark->rid, mark, &mid);
  }else{
    mark->name = fossil_strdup(cur_tok);
  }

  cur_tok = strtok(NULL, "\n");
  if(!cur_tok||strlen(cur_tok)!=40){
    free(mark->name);
................................................................................
}

/*
** import_marks()
**   Import the marks specified in file 'f' into the 'xmark' table.
**   If 'blobs' is non-null, insert all blob marks into it.
**   If 'vers' is non-null, insert all commit marks into it.
**   If 'unused_marks' is non-null, upon return of this function, all values
**   x >= *unused_marks are free to use as marks, i.e. they do not clash with
**   any marks appearing in the marks file.
**   Each line in the file must be at most 100 characters in length.  This
**   seems like a reasonable maximum for a 40-character uuid, and 1-13
**   character rid.
**   The function returns -1 if any of the lines in file 'f' are malformed,
**   or the rid/uuid information doesn't match what is in the repository
**   database.  Otherwise, 0 is returned.
*/
int import_marks(FILE* f, Bag *blobs, Bag *vers, unsigned int *unused_mark){
  char line[101];
  while(fgets(line, sizeof(line), f)){
    struct mark_t mark;
    if(strlen(line)==100&&line[99]!='\n'){
      /* line too long */
      return -1;
    }
    if( parse_mark(line, &mark)<0 ){
      return -1;
    }else if( line[0]=='b' ){


      if(blobs!=NULL){
        bag_insert(blobs, mark.rid);
      }
    }else{
      if( vers!=NULL ){
        bag_insert(vers, mark.rid);
      }
    }
    if( unused_mark!=NULL ){
      unsigned int mid = atoi(mark.name + 1);
      if( mid>=*unused_mark ){
	*unused_mark = mid + 1;
      }
    }
    free(mark.name);
  }
  return 0;
}

void export_mark(FILE* f, int rid, char obj_type)
{
  unsigned int z = 0;
  char *zUuid = rid_to_uuid(rid);
  char *zMark;
  if(zUuid==NULL){
    fossil_trace("No uuid matching rid=%d when exporting marks\n", rid);
    return;
  }
  /* Since rid is already in the 'xmark' table, the value of z won't be
  ** used, but pass in a valid pointer just to be safe. */
  zMark = mark_name_from_rid(rid, &z);
  fprintf(f, "%c%d %s %s\n", obj_type, rid, zMark, zUuid);
  free(zMark);
  free(zUuid);
}

/*
**  If 'blobs' is non-null, it must point to a Bag of blob rids to be
**  written to disk.  Blob rids are written as 'b<rid>'.
**  If 'vers' is non-null, it must point to a Bag of commit rids to be
**  written to disk.  Commit rids are written as 'c<rid> :<mark> <uuid>'.
**  All commit (mark,rid,uuid) tuples are stored in 'xmark' table.
**  This function does not fail, but may produce errors if a uuid cannot
**  be found for an rid in 'vers'.
*/
void export_marks(FILE* f, Bag *blobs, Bag *vers){
  int rid;

  if( blobs!=NULL ) {
    rid = bag_first(blobs);
    if( rid!=0 ){
      do{

        export_mark(f, rid, 'b');
      }while( (rid = bag_next(blobs, rid))!=0 );
    }
  }
  if( vers!=NULL ){
    rid = bag_first(vers);
    if( rid!=0 ){
      do{
        export_mark(f, rid, 'c');









      }while( (rid = bag_next(vers, rid))!=0 );
    }
  }
}

/*
** COMMAND: export
................................................................................
**
** See also: import
*/
void export_cmd(void){
  Stmt q, q2, q3;
  int i;
  Bag blobs, vers;
  unsigned int unused_mark = 1;
  const char *markfile_in;
  const char *markfile_out;

  bag_init(&blobs);
  bag_init(&vers);

  find_option("git", 0, 0);   /* Ignore the --git option for now */
................................................................................
    FILE *f;
    int rid;

    f = fossil_fopen(markfile_in, "r");
    if( f==0 ){
      fossil_fatal("cannot open %s for reading", markfile_in);
    }
    if(import_marks(f, &blobs, &vers, &unused_mark)<0){
      fossil_fatal("error importing marks from file: %s\n", markfile_in);
    }
    db_prepare(&qb, "INSERT OR IGNORE INTO oldblob VALUES (:rid)");
    db_prepare(&qc, "INSERT OR IGNORE INTO oldcommit VALUES (:rid)");
    rid = bag_first(&blobs);
    if(rid!=0){
      do{
................................................................................
  db_prepare(&q2, "INSERT INTO oldblob VALUES (:rid)");
  db_prepare(&q3, "SELECT rid FROM newblob WHERE srcid= (:srcid)");
  while( db_step(&q)==SQLITE_ROW ){
    int rid = db_column_int(&q, 0);
    Blob content;

    while( !bag_find(&blobs, rid) ){
      char *zMark;
      content_get(rid, &content);
      db_bind_int(&q2, ":rid", rid);
      db_step(&q2);
      db_reset(&q2);
      zMark = mark_name_from_rid(rid, &unused_mark);
      printf("blob\nmark %s\ndata %d\n", zMark, blob_size(&content));
      free(zMark);
      bag_insert(&blobs, rid);
      fwrite(blob_buffer(&content), 1, blob_size(&content), stdout);
      printf("\n");
      blob_reset(&content);

      db_bind_int(&q3, ":srcid", rid);
      if( db_step(&q3) != SQLITE_ROW ){
................................................................................
    db_step(&q2);
    db_reset(&q2);
    if( zBranch==0 ) zBranch = "trunk";
    zBr = mprintf("%s", zBranch);
    for(i=0; zBr[i]; i++){
      if( !fossil_isalnum(zBr[i]) ) zBr[i] = '_';
    }
    zMark = mark_name_from_rid(ckinId, &unused_mark);
    printf("commit refs/heads/%s\nmark %s\n", zBr, zMark);
    free(zMark);
    free(zBr);
    printf("committer");
    print_person(zUser);
    printf(" %s +0000\n", zSecondsSince1970);
    if( zComment==0 ) zComment = "null comment";
................................................................................
      "SELECT pid FROM plink"
      " WHERE cid=%d AND isprim"
      "   AND pid IN (SELECT objid FROM event)",
      ckinId
    );
    if( db_step(&q3) == SQLITE_ROW ){
      int pid = db_column_int(&q3, 0);
      zMark = mark_name_from_rid(pid, &unused_mark);
      printf("from %s\n", zMark);
      free(zMark);
      db_prepare(&q4,
        "SELECT pid FROM plink"
        " WHERE cid=%d AND NOT isprim"
        "   AND NOT EXISTS(SELECT 1 FROM phantom WHERE rid=pid)"
        " ORDER BY pid",
        ckinId);
      while( db_step(&q4)==SQLITE_ROW ){
        zMark = mark_name_from_rid(db_column_int(&q4, 0), &unused_mark);
        printf("merge %s\n", zMark);
        free(zMark);
      }
      db_finalize(&q4);
    }else{
      printf("deleteall\n");
    }
................................................................................
    while( db_step(&q4)==SQLITE_ROW ){
      const char *zName = db_column_text(&q4,0);
      int zNew = db_column_int(&q4,1);
      int mPerm = db_column_int(&q4,2);
      if( zNew==0)
        printf("D %s\n", zName);
      else if( bag_find(&blobs, zNew) ) {
        zMark = mark_name_from_rid(zNew, &unused_mark);
        const char *zPerm;
        switch( mPerm ){
          case PERM_LNK:  zPerm = "120000";   break;
          case PERM_EXE:  zPerm = "100755";   break;
          default:        zPerm = "100644";   break;
        }
        printf("M %s %s %s\n", zPerm, zMark, zName);
        free(zMark);
      }
    }
    db_finalize(&q4);
    db_finalize(&q3);
    printf("\n");
  }
  db_finalize(&q2);

Changes to src/import.c.

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    );

    if( markfile_in ){
      FILE *f = fossil_fopen(markfile_in, "r");
      if( !f ){
        fossil_fatal("cannot open %s for reading\n", markfile_in);
      }
      if(import_marks(f, &blobs, NULL)<0){
        fossil_fatal("error importing marks from file: %s\n", markfile_in);
      }
      fclose(f);
    }

    manifest_crosslink_begin();
    git_fast_import(pIn);
................................................................................
      Stmt q_marks;
      FILE *f;
      db_prepare(&q_marks, "SELECT DISTINCT trid FROM xmark");
      while( db_step(&q_marks)==SQLITE_ROW ){
        rid = db_column_int(&q_marks, 0);
        if( db_int(0, "SELECT count(objid) FROM event"
                      " WHERE objid=%d AND type='ci'", rid)==0 ){
          if( bag_find(&blobs, rid)==0 ){
            bag_insert(&blobs, rid);
          }
        }else{
          bag_insert(&vers, rid);
        }
      }
      db_finalize(&q_marks);
      f = fossil_fopen(markfile_out, "w");
      if( !f ){







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    );

    if( markfile_in ){
      FILE *f = fossil_fopen(markfile_in, "r");
      if( !f ){
        fossil_fatal("cannot open %s for reading\n", markfile_in);
      }
      if(import_marks(f, &blobs, NULL, NULL)<0){
        fossil_fatal("error importing marks from file: %s\n", markfile_in);
      }
      fclose(f);
    }

    manifest_crosslink_begin();
    git_fast_import(pIn);
................................................................................
      Stmt q_marks;
      FILE *f;
      db_prepare(&q_marks, "SELECT DISTINCT trid FROM xmark");
      while( db_step(&q_marks)==SQLITE_ROW ){
        rid = db_column_int(&q_marks, 0);
        if( db_int(0, "SELECT count(objid) FROM event"
                      " WHERE objid=%d AND type='ci'", rid)==0 ){
          /* Blob marks exported by git aren't saved between runs, so they need
          ** to be left free for git to re-use in the future.
          */
        }else{
          bag_insert(&vers, rid);
        }
      }
      db_finalize(&q_marks);
      f = fossil_fopen(markfile_out, "w");
      if( !f ){