thodg/got/lib/diff.c

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• Show log

  Commit

• Author : Stefan Sperling
  Date : 2018-01-12 20:59:51
  Hash : a1fd68d8
  Message : Extract non-deltified objects from pack files.

• lib/diff.c

• /*
   * Copyright (c) 2017 Stefan Sperling <stsp@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/queue.h>
  #include <sys/stat.h>
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <limits.h>
  #include <sha1.h>
  #include <zlib.h>
  
  #include "got_repository.h"
  #include "got_object.h"
  #include "got_error.h"
  #include "got_diff.h"
  
  #include "diff.h"
  #include "path.h"
  
  const struct got_error *
  got_diff_blob(struct got_blob_object *blob1, struct got_blob_object *blob2,
      const char *label1, const char *label2, FILE *outfile)
  {
  	struct got_diff_state ds;
  	struct got_diff_args args;
  	const struct got_error *err = NULL;
  	FILE *f1 = NULL, *f2 = NULL;
  	char hex1[SHA1_DIGEST_STRING_LENGTH];
  	char hex2[SHA1_DIGEST_STRING_LENGTH];
  	char *idstr1 = NULL, *idstr2 = NULL;
  	size_t len, hdrlen;
  	int res, flags = 0;
  
  	if (blob1) {
  		f1 = got_opentemp();
  		if (f1 == NULL)
  			return got_error(GOT_ERR_FILE_OPEN);
  	} else
  		flags |= D_EMPTY1;
  
  	if (blob2) {
  		f2 = got_opentemp();
  		if (f2 == NULL) {
  			fclose(f1);
  			return got_error(GOT_ERR_FILE_OPEN);
  		}
  	} else
  		flags |= D_EMPTY2;
  
  	if (blob1) {
  		idstr1 = got_object_id_str(&blob1->id, hex1, sizeof(hex1));
  		hdrlen = blob1->hdrlen;
  		do {
  			err = got_object_blob_read_block(blob1, &len);
  			if (err)
  				goto done;
  			/* Skip blob object header first time around. */
  			fwrite(blob1->zb.outbuf + hdrlen, len - hdrlen, 1, f1);
  			hdrlen = 0;
  		} while (len != 0);
  	} else
  		idstr1 = "/dev/null";
  
  	if (blob2) {
  		idstr2 = got_object_id_str(&blob2->id, hex2, sizeof(hex2));
  		hdrlen = blob2->hdrlen;
  		do {
  			err = got_object_blob_read_block(blob2, &len);
  			if (err)
  				goto done;
  			/* Skip blob object header first time around. */
  			fwrite(blob2->zb.outbuf + hdrlen, len - hdrlen, 1, f2);
  			hdrlen = 0;
  		} while (len != 0);
  	} else
  		idstr2 = "/dev/null";
  
  	if (f1)
  		fflush(f1);
  	if (f2)
  		fflush(f2);
  
  	memset(&ds, 0, sizeof(ds));
  	/* XXX should stat buffers be passed in args instead of ds? */
  	ds.stb1.st_mode = S_IFREG;
  	if (blob1)
  		ds.stb1.st_size = blob1->zb.z.total_out;
  	ds.stb1.st_mtime = 0; /* XXX */
  
  	ds.stb2.st_mode = S_IFREG;
  	if (blob2)
  		ds.stb2.st_size = blob2->zb.z.total_out;
  	ds.stb2.st_mtime = 0; /* XXX */
  
  	memset(&args, 0, sizeof(args));
  	args.diff_format = D_UNIFIED;
  	args.label[0] = label1 ? label1 : idstr1;
  	args.label[1] = label2 ? label2 : idstr2;
  
  	err = got_diffreg(&res, f1, f2, flags, &args, &ds, outfile);
  done:
  	if (f1)
  		fclose(f1);
  	if (f2)
  		fclose(f2);
  	return err;
  }
  
  struct got_tree_entry *
  match_entry_by_name(struct got_tree_entry *te1, struct got_tree_object *tree2)
  {
  	struct got_tree_entry *te2;
  
  	SIMPLEQ_FOREACH(te2, &tree2->entries, entry) {
  		if (strcmp(te1->name, te2->name) == 0)
  			return te2;
  	}
  	return NULL;
  }
  
  static const struct got_error *
  diff_added_blob(struct got_object_id *id, struct got_repository *repo)
  {
  	const struct got_error *err;
  	struct got_blob_object  *blob;
  	struct got_object *obj;
  
  	err = got_object_open(&obj, repo, id);
  	if (err)
  		return err;
  	err = got_object_blob_open(&blob, repo, obj, 8192);
  	if (err != NULL)
  		return err;
  
  	return got_diff_blob(NULL, blob, NULL, NULL, stdout);
  }
  
  static const struct got_error *
  diff_modified_blob(struct got_object_id *id1, struct got_object_id *id2,
      struct got_repository *repo)
  {
  	const struct got_error *err;
  	struct got_object *obj1 = NULL;
  	struct got_object *obj2 = NULL;
  	struct got_blob_object *blob1 = NULL;
  	struct got_blob_object *blob2 = NULL;
  
  	err = got_object_open(&obj1, repo, id1);
  	if (err)
  		return got_error(GOT_ERR_BAD_OBJ_HDR);
  	if (obj1->type != GOT_OBJ_TYPE_BLOB) {
  		err = got_error(GOT_ERR_OBJ_TYPE);
  		goto done;
  	}
  
  	err = got_object_open(&obj2, repo, id2);
  	if (err) {
  		err= got_error(GOT_ERR_BAD_OBJ_HDR);
  		goto done;
  	}
  	if (obj2->type != GOT_OBJ_TYPE_BLOB) {
  		err = got_error(GOT_ERR_BAD_OBJ_DATA);
  		goto done;
  	}
  
  	err = got_object_blob_open(&blob1, repo, obj1, 8192);
  	if (err != NULL) {
  		err = got_error(GOT_ERR_FILE_OPEN);
  		goto done;
  	}
  
  	err = got_object_blob_open(&blob2, repo, obj2, 8192);
  	if (err != NULL) {
  		err = got_error(GOT_ERR_FILE_OPEN);
  		goto done;
  	}
  
  	err = got_diff_blob(blob1, blob2, NULL, NULL, stdout);
  
  done:
  	if (obj1)
  		got_object_close(obj1);
  	if (obj2)
  		got_object_close(obj2);
  	if (blob1)
  		got_object_blob_close(blob1);
  	if (blob2)
  		got_object_blob_close(blob2);
  	return err;
  }
  
  static const struct got_error *
  diff_deleted_blob(struct got_object_id *id, struct got_repository *repo)
  {
  	const struct got_error *err;
  	struct got_blob_object  *blob;
  	struct got_object *obj;
  
  	err = got_object_open(&obj, repo, id);
  	if (err)
  		return err;
  	err = got_object_blob_open(&blob, repo, obj, 8192);
  	if (err != NULL)
  		return err;
  
  	return got_diff_blob(blob, NULL, NULL, NULL, stdout);
  }
  
  static const struct got_error *
  diff_added_tree(struct got_object_id *id, struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	struct got_object *treeobj = NULL;
  	struct got_tree_object *tree = NULL;
  
  	err = got_object_open(&treeobj, repo, id);
  	if (err)
  		goto done;
  
  	if (treeobj->type != GOT_OBJ_TYPE_TREE) {
  		err = got_error(GOT_ERR_OBJ_TYPE);
  		goto done;
  	}
  
  	err = got_object_tree_open(&tree, repo, treeobj);
  	if (err)
  		goto done;
  
  	err = got_diff_tree(NULL, tree, repo);
  
  done:
  	if (tree)
  		got_object_tree_close(tree);
  	if (treeobj)
  		got_object_close(treeobj);
  	return err;
  }
  
  static const struct got_error *
  diff_modified_tree(struct got_object_id *id1, struct got_object_id *id2,
      struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	struct got_object *treeobj1 = NULL;
  	struct got_object *treeobj2 = NULL;
  	struct got_tree_object *tree1 = NULL;
  	struct got_tree_object *tree2 = NULL;
  
  	err = got_object_open(&treeobj1, repo, id1);
  	if (err)
  		goto done;
  
  	if (treeobj1->type != GOT_OBJ_TYPE_TREE) {
  		err = got_error(GOT_ERR_OBJ_TYPE);
  		goto done;
  	}
  
  	err = got_object_open(&treeobj2, repo, id2);
  	if (err)
  		goto done;
  
  	if (treeobj2->type != GOT_OBJ_TYPE_TREE) {
  		err = got_error(GOT_ERR_OBJ_TYPE);
  		goto done;
  	}
  
  	err = got_object_tree_open(&tree1, repo, treeobj1);
  	if (err)
  		goto done;
  
  	err = got_object_tree_open(&tree2, repo, treeobj2);
  	if (err)
  		goto done;
  
  	err = got_diff_tree(tree1, tree2, repo);
  
  done:
  	if (tree1)
  		got_object_tree_close(tree1);
  	if (tree2)
  		got_object_tree_close(tree2);
  	if (treeobj1)
  		got_object_close(treeobj1);
  	if (treeobj2)
  		got_object_close(treeobj2);
  	return err;
  }
  
  static const struct got_error *
  diff_deleted_tree(struct got_object_id *id, struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	struct got_object *treeobj = NULL;
  	struct got_tree_object *tree = NULL;
  
  	err = got_object_open(&treeobj, repo, id);
  	if (err)
  		goto done;
  
  	if (treeobj->type != GOT_OBJ_TYPE_TREE) {
  		err = got_error(GOT_ERR_OBJ_TYPE);
  		goto done;
  	}
  
  	err = got_object_tree_open(&tree, repo, treeobj);
  	if (err)
  		goto done;
  
  	err = got_diff_tree(tree, NULL, repo);
  
  done:
  	if (tree)
  		got_object_tree_close(tree);
  	if (treeobj)
  		got_object_close(treeobj);
  	return err;
  }
  
  static const struct got_error *
  diff_kind_mismatch(struct got_object_id *id1, struct got_object_id *id2)
  {
  	/* XXX TODO */
  	return NULL;
  }
  
  static const struct got_error *
  diff_entry_old_new(struct got_tree_entry *te1, struct got_tree_object *tree2,
      struct got_repository *repo)
  {
  	const struct got_error *err;
  	struct got_tree_entry *te2;
  	char hex[SHA1_DIGEST_STRING_LENGTH];
  
  	te2 = match_entry_by_name(te1, tree2);
  	if (te2 == NULL) {
  		if (S_ISDIR(te1->mode))
  			return diff_deleted_tree(&te1->id, repo);
  		return diff_deleted_blob(&te1->id, repo);
  	}
  
  	if (S_ISDIR(te1->mode) && S_ISDIR(te2->mode)) {
  		if (got_object_id_cmp(&te1->id, &te2->id) != 0)
  			return diff_modified_tree(&te1->id, &te2->id, repo);
  	} else if (S_ISREG(te1->mode) && S_ISREG(te2->mode)) {
  		if (got_object_id_cmp(&te1->id, &te2->id) != 0)
  			return diff_modified_blob(&te1->id, &te2->id, repo);
  	}
  
  	return diff_kind_mismatch(&te1->id, &te2->id);
  }
  
  static const struct got_error *
  diff_entry_new_old(struct got_tree_entry *te2, struct got_tree_object *tree1,
      struct got_repository *repo)
  {
  	const struct got_error *err;
  	struct got_tree_entry *te1;
  
  	te1 = match_entry_by_name(te2, tree1);
  	if (te1 != NULL) /* handled by diff_entry_old_new() */
  		return NULL;
  
  	if (S_ISDIR(te2->mode))
  		return diff_added_tree(&te2->id, repo);
  	return diff_added_blob(&te2->id, repo);
  }
  
  const struct got_error *
  got_diff_tree(struct got_tree_object *tree1, struct got_tree_object *tree2,
      struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	struct got_tree_entry *te1 = NULL;
  	struct got_tree_entry *te2 = NULL;
  
  	if (tree1)
  		te1 = SIMPLEQ_FIRST(&tree1->entries);
  	if (tree2)
  		te2 = SIMPLEQ_FIRST(&tree2->entries);
  
  	do {
  		if (te1) {
  			err = diff_entry_old_new(te1, tree2, repo);
  			if (err)
  				break;
  		}
  
  		if (te2) {
  			err = diff_entry_new_old(te2, tree1, repo);
  			if (err)
  				break;
  		}
  
  		if (te1)
  			te1 = SIMPLEQ_NEXT(te1, entry);
  		if (te2)
  			te2 = SIMPLEQ_NEXT(te2, entry);
  	} while (te1 || te2);
  
  	return err;
  }