thodg/got/lib/reference.c

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• Show log

  Commit

• Author : Stefan Sperling
  Date : 2018-04-01 23:37:09
  Hash : 5261c201
  Message : rename 'refs' to 'reference'

• lib/reference.c

• /*
   * Copyright (c) 2018 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/types.h>
  #include <sys/queue.h>
  
  #include <sha1.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <util.h>
  #include <zlib.h>
  
  #include "got_error.h"
  #include "got_object.h"
  #include "got_repository.h"
  #include "got_reference.h"
  
  #include "got_lib_sha1.h"
  #include "got_lib_path.h"
  #include "got_lib_delta.h"
  #include "got_lib_zbuf.h"
  #include "got_lib_object.h"
  
  /* A symbolic reference. */
  struct got_symref {
  	char *name;
  	char *ref;
  };
  
  /* A non-symbolic reference (there is no better designation). */
  struct got_ref {
  	char *name;
  	u_int8_t sha1[SHA1_DIGEST_LENGTH];
  };
  
  /* A reference which points to an arbitrary object. */
  struct got_reference {
  	unsigned int flags;
  #define GOT_REF_IS_SYMBOLIC	0x01
  
  	union {
  		struct got_ref ref;
  		struct got_symref symref;
  	} ref;
  };
  
  static const struct got_error *
  parse_symref(struct got_reference **ref, const char *name, const char *line)
  {
  	struct got_symref *symref;
  	char *symref_name;
  	char *symref_ref;
  
  	if (line[0] == '\0')
  		return got_error(GOT_ERR_NOT_REF);
  
  	symref_name = strdup(name);
  	if (symref_name == NULL)
  		return got_error_from_errno();
  	symref_ref = strdup(line);
  	if (symref_ref == NULL) {
  		const struct got_error *err = got_error_from_errno();
  		free(symref_name);
  		return err;
  	}
  
  	*ref = calloc(1, sizeof(**ref));
  	if (*ref == NULL)
  		return got_error_from_errno();
  	(*ref)->flags |= GOT_REF_IS_SYMBOLIC;
  	symref = &((*ref)->ref.symref);
  	symref->name = symref_name;
  	symref->ref = symref_ref;
  	return NULL;
  }
  
  static const struct got_error *
  parse_ref_line(struct got_reference **ref, const char *name, const char *line)
  {
  	uint8_t digest[SHA1_DIGEST_LENGTH];
  	char *ref_name;
  
  	if (strncmp(line, "ref: ", 5) == 0) {
  		line += 5;
  		return parse_symref(ref, name, line);
  	}
  
  	ref_name = strdup(name);
  	if (ref_name == NULL)
  		return got_error_from_errno();
  
  	if (!got_parse_sha1_digest(digest, line))
  		return got_error(GOT_ERR_NOT_REF);
  
  	*ref = calloc(1, sizeof(**ref));
  	if (*ref == NULL)
  		return got_error_from_errno();
  	(*ref)->ref.ref.name = ref_name;
  	memcpy(&(*ref)->ref.ref.sha1, digest, SHA1_DIGEST_LENGTH);
  	return NULL;
  }
  
  static const struct got_error *
  parse_ref_file(struct got_reference **ref, const char *name,
      const char *abspath)
  {
  	const struct got_error *err = NULL;
  	FILE *f = fopen(abspath, "rb");
  	char *line;
  	size_t len;
  	const char delim[3] = {'\0', '\0', '\0'};
  
  	if (f == NULL)
  		return got_error(GOT_ERR_NOT_REF);
  
  	line = fparseln(f, &len, NULL, delim, 0);
  	if (line == NULL) {
  		err = got_error(GOT_ERR_NOT_REF);
  		goto done;
  	}
  
  	err = parse_ref_line(ref, name, line);
  done:
  	free(line);
  	fclose(f);
  	return err;
  }
  
  static char *
  get_refs_dir_path(struct got_repository *repo, const char *refname)
  {
  	if (strcmp(refname, GOT_REF_HEAD) == 0 ||
  	    strcmp(refname, GOT_REF_ORIG_HEAD) == 0 ||
  	    strcmp(refname, GOT_REF_MERGE_HEAD) == 0 ||
  	    strcmp(refname, GOT_REF_FETCH_HEAD) == 0 ||
  	    strncmp(refname, "refs/", 5) == 0)
  		return got_repo_get_path_git_dir(repo);
  
  	return got_repo_get_path_refs(repo);
  }
  
  const struct got_error *
  got_ref_open(struct got_reference **ref, struct got_repository *repo,
     const char *refname)
  {
  	const struct got_error *err = NULL;
  	char *path_ref = NULL;
  	char *normpath = NULL;
  	char *path_refs = get_refs_dir_path(repo, refname);
  
  	if (path_refs == NULL) {
  		err = got_error_from_errno();
  		goto done;
  	}
  	
  	/* XXX For now, this assumes that refs exist in the filesystem. */
  
  	if (asprintf(&path_ref, "%s/%s", path_refs, refname) == -1) {
  		err = got_error_from_errno();
  		goto done;
  	}
  
  	normpath = got_path_normalize(path_ref);
  	if (normpath == NULL) {
  		err = got_error(GOT_ERR_NOT_REF);
  		goto done;
  	}
  
  	err = parse_ref_file(ref, refname, normpath);
  done:
  	free(normpath);
  	free(path_ref);
  	free(path_refs);
  	return err;
  }
  
  void
  got_ref_close(struct got_reference *ref)
  {
  	if (ref->flags & GOT_REF_IS_SYMBOLIC)
  		free(ref->ref.symref.name);
  	else
  		free(ref->ref.ref.name);
  	free(ref);
  }
  
  struct got_reference *
  got_ref_dup(struct got_reference *ref)
  {
  	struct got_reference *ret;
  
  	ret = calloc(1, sizeof(*ret));
  	if (ret == NULL)
  		return NULL;
  
  	ret->flags = ref->flags;
  	if (ref->flags & GOT_REF_IS_SYMBOLIC) {
  		ret->ref.symref.name = strdup(ref->ref.symref.name);
  		if (ret->ref.symref.name == NULL) {
  			free(ret);
  			return NULL;
  		}
  		ret->ref.symref.ref = strdup(ref->ref.symref.ref);
  		if (ret->ref.symref.ref == NULL) {
  			free(ret->ref.symref.name);
  			free(ret);
  			return NULL;
  		}
  	} else {
  		ref->ref.ref.name = strdup(ref->ref.ref.name);
  		if (ref->ref.ref.name == NULL) {
  			free(ret);
  			return NULL;
  		}
  		memcpy(ret->ref.ref.sha1, ref->ref.ref.sha1,
  		    SHA1_DIGEST_LENGTH);
  	}
  
  	return ret;
  }
  
  static const struct got_error *
  resolve_symbolic_ref(struct got_reference **resolved,
      struct got_repository *repo, struct got_reference *ref)
  {
  	struct got_reference *nextref;
  	const struct got_error *err;
  
  	err = got_ref_open(&nextref, repo, ref->ref.symref.ref);
  	if (err)
  		return err;
  
  	if (nextref->flags & GOT_REF_IS_SYMBOLIC)
  		err = resolve_symbolic_ref(resolved, repo, nextref);
  	else
  		*resolved = got_ref_dup(nextref);
  
  	got_ref_close(nextref);
  	return err;
  }
  
  const struct got_error *
  got_ref_resolve(struct got_object_id **id, struct got_repository *repo,
      struct got_reference *ref)
  {
  	const struct got_error *err;
  
  	if (ref->flags & GOT_REF_IS_SYMBOLIC) {
  		struct got_reference *resolved = NULL;
  		err = resolve_symbolic_ref(&resolved, repo, ref);
  		if (err == NULL)
  			err = got_ref_resolve(id, repo, resolved);
  		free(resolved);
  		return err;
  	}
  
  	*id = calloc(1, sizeof(**id));
  	if (*id == NULL)
  		return got_error_from_errno();
  	memcpy((*id)->sha1, ref->ref.ref.sha1, SHA1_DIGEST_LENGTH);
  	return NULL;
  }
  
  char *
  got_ref_to_str(struct got_reference *ref)
  {
  	char *str;
  	if (ref->flags & GOT_REF_IS_SYMBOLIC) {
  		if (asprintf(&str, "ref: %s", ref->ref.symref.ref) == -1)
  			return NULL;
  	} else {
  		str = calloc(1, SHA1_DIGEST_STRING_LENGTH);
  		if (str == NULL)
  			return NULL;
  		str = got_sha1_digest_to_str(ref->ref.ref.sha1, str,
  		    SHA1_DIGEST_STRING_LENGTH);
  	}
  
  	return str;
  }