thodg/libgit2/src/refspec.c

• Show log

  Commit

• Hash : 3e012fca
  Author :
  Date : 2012-09-26T19:15:11
  

  refspec: introduce git_refspec_transform_l()

Download

• src/refspec.c

• /*
   * Copyright (C) 2009-2012 the libgit2 contributors
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "git2/errors.h"
  
  #include "common.h"
  #include "refspec.h"
  #include "util.h"
  #include "posix.h"
  #include "refs.h"
  
  int git_refspec__parse(git_refspec *refspec, const char *input, bool is_fetch)
  {
  	// Ported from https://github.com/git/git/blob/f06d47e7e0d9db709ee204ed13a8a7486149f494/remote.c#L518-636
  
  	size_t llen;
  	int is_glob = 0;
  	const char *lhs, *rhs;
  	int flags;
  
  	assert(refspec && input);
  
  	memset(refspec, 0x0, sizeof(git_refspec));
  
  	lhs = input;
  	if (*lhs == '+') {
  		refspec->force = 1;
  		lhs++;
  	}
  
  	rhs = strrchr(lhs, ':');
  
  	/*
  	 * Before going on, special case ":" (or "+:") as a refspec
  	 * for matching refs.
  	 */
  	if (!is_fetch && rhs == lhs && rhs[1] == '\0') {
  		refspec->matching = 1;
  		return 0;
  	}
  
  	if (rhs) {
  		size_t rlen = strlen(++rhs);
  		is_glob = (1 <= rlen && strchr(rhs, '*'));
  		refspec->dst = git__strndup(rhs, rlen);
  	}
  
  	llen = (rhs ? (size_t)(rhs - lhs - 1) : strlen(lhs));
  	if (1 <= llen && memchr(lhs, '*', llen)) {
  		if ((rhs && !is_glob) || (!rhs && is_fetch))
  			goto invalid;
  		is_glob = 1;
  	} else if (rhs && is_glob)
  		goto invalid;
  
  	refspec->pattern = is_glob;
  	refspec->src = git__strndup(lhs, llen);
  	flags = GIT_REF_FORMAT_ALLOW_ONELEVEL
  		| (is_glob ? GIT_REF_FORMAT_REFSPEC_PATTERN : 0);
  
  	if (is_fetch) {
  		/*
  			* LHS
  			* - empty is allowed; it means HEAD.
  			* - otherwise it must be a valid looking ref.
  			*/
  		if (!*refspec->src)
  			; /* empty is ok */
  		else if (!git_reference__is_valid_name(refspec->src, flags))
  			goto invalid;
  		/*
  			* RHS
  			* - missing is ok, and is same as empty.
  			* - empty is ok; it means not to store.
  			* - otherwise it must be a valid looking ref.
  			*/
  		if (!refspec->dst)
  			; /* ok */
  		else if (!*refspec->dst)
  			; /* ok */
  		else if (!git_reference__is_valid_name(refspec->dst, flags))
  			goto invalid;
  	} else {
  		/*
  			* LHS
  			* - empty is allowed; it means delete.
  			* - when wildcarded, it must be a valid looking ref.
  			* - otherwise, it must be an extended SHA-1, but
  			*   there is no existing way to validate this.
  			*/
  		if (!*refspec->src)
  			; /* empty is ok */
  		else if (is_glob) {
  			if (!git_reference__is_valid_name(refspec->src, flags))
  				goto invalid;
  		}
  		else {
  			; /* anything goes, for now */
  		}
  		/*
  			* RHS
  			* - missing is allowed, but LHS then must be a
  			*   valid looking ref.
  			* - empty is not allowed.
  			* - otherwise it must be a valid looking ref.
  			*/
  		if (!refspec->dst) {
  			if (!git_reference__is_valid_name(refspec->src, flags))
  				goto invalid;
  		} else if (!*refspec->dst) {
  			goto invalid;
  		} else {
  			if (!git_reference__is_valid_name(refspec->dst, flags))
  				goto invalid;
  		}
  	}
  
  	return 0;
  
   invalid:
  	return -1;
  }
  
  void git_refspec__free(git_refspec *refspec)
  {
  	git__free(refspec->src);
  	git__free(refspec->dst);
  }
  
  const char *git_refspec_src(const git_refspec *refspec)
  {
  	return refspec == NULL ? NULL : refspec->src;
  }
  
  const char *git_refspec_dst(const git_refspec *refspec)
  {
  	return refspec == NULL ? NULL : refspec->dst;
  }
  
  int git_refspec_force(const git_refspec *refspec)
  {
  	assert(refspec);
  
  	return refspec->force;
  }
  
  int git_refspec_src_matches(const git_refspec *refspec, const char *refname)
  {
  	if (refspec == NULL || refspec->src == NULL)
  		return false;
  
  	return (p_fnmatch(refspec->src, refname, 0) == 0);
  }
  
  int git_refspec_transform(char *out, size_t outlen, const git_refspec *spec, const char *name)
  {
  	size_t baselen, namelen;
  
  	baselen = strlen(spec->dst);
  	if (outlen <= baselen) {
  		giterr_set(GITERR_INVALID, "Reference name too long");
  		return GIT_EBUFS;
  	}
  
  	/*
  	 * No '*' at the end means that it's mapped to one specific local
  	 * branch, so no actual transformation is needed.
  	 */
  	if (spec->dst[baselen - 1] != '*') {
  		memcpy(out, spec->dst, baselen + 1); /* include '\0' */
  		return 0;
  	}
  
  	/* There's a '*' at the end, so remove its length */
  	baselen--;
  
  	/* skip the prefix, -1 is for the '*' */
  	name += strlen(spec->src) - 1;
  
  	namelen = strlen(name);
  
  	if (outlen <= baselen + namelen) {
  		giterr_set(GITERR_INVALID, "Reference name too long");
  		return GIT_EBUFS;
  	}
  
  	memcpy(out, spec->dst, baselen);
  	memcpy(out + baselen, name, namelen + 1);
  
  	return 0;
  }
  
  static int refspec_transform(git_buf *out, const char *from, const char *to, const char *name)
  {
  	if (git_buf_sets(out, to) < 0)
  		return -1;
  
  	/*
  	 * No '*' at the end means that it's mapped to one specific
  	 * branch, so no actual transformation is needed.
  	 */
  	if (git_buf_len(out) > 0 && out->ptr[git_buf_len(out) - 1] != '*')
  		return 0;
  
  	git_buf_truncate(out, git_buf_len(out) - 1); /* remove trailing '*' */
  	git_buf_puts(out, name + strlen(from) - 1);
  
  	if (git_buf_oom(out))
  		return -1;
  
  	return 0;
  }
  
  int git_refspec_transform_r(git_buf *out, const git_refspec *spec, const char *name)
  {
  	return refspec_transform(out, spec->src, spec->dst, name);
  }
  
  int git_refspec_transform_l(git_buf *out, const git_refspec *spec, const char *name)
  {
  	return refspec_transform(out, spec->dst, spec->src, name);
  }
  
  

Download