thodg/libgit2/tests/refs/reflog/reflog_helpers.c

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• Hash : f0e693b1
  Author :
  Date : 2021-09-07T17:53:49
  

  str: introduce `git_str` for internal, `git_buf` is external libgit2 has two distinct requirements that were previously solved by `git_buf`. We require: 1. A general purpose string class that provides a number of utility APIs for manipulating data (eg, concatenating, truncating, etc). 2. A structure that we can use to return strings to callers that they can take ownership of. By using a single class (`git_buf`) for both of these purposes, we have confused the API to the point that refactorings are difficult and reasoning about correctness is also difficult. Move the utility class `git_buf` to be called `git_str`: this represents its general purpose, as an internal string buffer class. The name also is an homage to Junio Hamano ("gitstr"). The public API remains `git_buf`, and has a much smaller footprint. It is generally only used as an "out" param with strict requirements that follow the documentation. (Exceptions exist for some legacy APIs to avoid breaking callers unnecessarily.) Utility functions exist to convert a user-specified `git_buf` to a `git_str` so that we can call internal functions, then converting it back again.

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• tests/refs/reflog/reflog_helpers.c

• #include "clar_libgit2.h"
  
  #include "repository.h"
  #include "reflog.h"
  
  static int reflog_entry_tostr(git_str *out, const git_reflog_entry *entry)
  {
  	char old_oid[GIT_OID_HEXSZ], new_oid[GIT_OID_HEXSZ];
  
  	assert(out && entry);
  
  	git_oid_tostr((char *)&old_oid, GIT_OID_HEXSZ, git_reflog_entry_id_old(entry));
  	git_oid_tostr((char *)&new_oid, GIT_OID_HEXSZ, git_reflog_entry_id_new(entry));
  
  	return git_str_printf(out, "%s %s %s %s", old_oid, new_oid, "somesig", git_reflog_entry_message(entry));
  }
  
  size_t reflog_entrycount(git_repository *repo, const char *name)
  {
  	git_reflog *log;
  	size_t ret;
  
  	cl_git_pass(git_reflog_read(&log, repo, name));
  	ret = git_reflog_entrycount(log);
  	git_reflog_free(log);
  
  	return ret;
  }
  
  void cl_reflog_check_entry_(git_repository *repo, const char *reflog, size_t idx,
  	const char *old_spec, const char *new_spec,
  	const char *email, const char *message,
  	const char *file, const char *func, int line)
  {
  	git_reflog *log;
  	const git_reflog_entry *entry;
  	git_str result = GIT_STR_INIT;
  
  	cl_git_pass(git_reflog_read(&log, repo, reflog));
  	entry = git_reflog_entry_byindex(log, idx);
  	if (entry == NULL)
  		clar__fail(file, func, line, "Reflog has no such entry", NULL, 1);
  
  	if (old_spec) {
  		git_object *obj = NULL;
  		if (git_revparse_single(&obj, repo, old_spec) == GIT_OK) {
  			if (git_oid_cmp(git_object_id(obj), git_reflog_entry_id_old(entry)) != 0) {
  				git_oid__writebuf(&result, "\tOld OID: \"", git_object_id(obj));
  				git_oid__writebuf(&result, "\" != \"", git_reflog_entry_id_old(entry));
  				git_str_puts(&result, "\"\n");
  			}
  			git_object_free(obj);
  		} else {
  			git_oid *oid = git__calloc(1, sizeof(*oid));
  			git_oid_fromstr(oid, old_spec);
  			if (git_oid_cmp(oid, git_reflog_entry_id_old(entry)) != 0) {
  				git_oid__writebuf(&result, "\tOld OID: \"", oid);
  				git_oid__writebuf(&result, "\" != \"", git_reflog_entry_id_old(entry));
  				git_str_puts(&result, "\"\n");
  			}
  			git__free(oid);
  		}
  	}
  	if (new_spec) {
  		git_object *obj = NULL;
  		if (git_revparse_single(&obj, repo, new_spec) == GIT_OK) {
  			if (git_oid_cmp(git_object_id(obj), git_reflog_entry_id_new(entry)) != 0) {
  				git_oid__writebuf(&result, "\tNew OID: \"", git_object_id(obj));
  				git_oid__writebuf(&result, "\" != \"", git_reflog_entry_id_new(entry));
  				git_str_puts(&result, "\"\n");
  			}
  			git_object_free(obj);
  		} else {
  			git_oid *oid = git__calloc(1, sizeof(*oid));
  			git_oid_fromstr(oid, new_spec);
  			if (git_oid_cmp(oid, git_reflog_entry_id_new(entry)) != 0) {
  				git_oid__writebuf(&result, "\tNew OID: \"", oid);
  				git_oid__writebuf(&result, "\" != \"", git_reflog_entry_id_new(entry));
  				git_str_puts(&result, "\"\n");
  			}
  			git__free(oid);
  		}
  	}
  
  	if (email && strcmp(email, git_reflog_entry_committer(entry)->email) != 0)
  		git_str_printf(&result, "\tEmail: \"%s\" != \"%s\"\n", email, git_reflog_entry_committer(entry)->email);
  
  	if (message) {
  		const char *entry_msg = git_reflog_entry_message(entry);
  		if (entry_msg == NULL) entry_msg = "";
  
  		if (entry_msg && strcmp(message, entry_msg) != 0)
  			git_str_printf(&result, "\tMessage: \"%s\" != \"%s\"\n", message, entry_msg);
  	}
  	if (git_str_len(&result) != 0)
  		clar__fail(file, func, line, "Reflog entry mismatch", git_str_cstr(&result), 1);
  
  	git_str_dispose(&result);
  	git_reflog_free(log);
  }
  
  void reflog_print(git_repository *repo, const char *reflog_name)
  {
  	git_reflog *reflog;
  	size_t idx;
  	git_str out = GIT_STR_INIT;
  
  	git_reflog_read(&reflog, repo, reflog_name);
  
  	for (idx = 0; idx < git_reflog_entrycount(reflog); idx++) {
  		const git_reflog_entry *entry = git_reflog_entry_byindex(reflog, idx);
  		reflog_entry_tostr(&out, entry);
  		git_str_putc(&out, '\n');
  	}
  
  	fprintf(stderr, "%s", git_str_cstr(&out));
  	git_str_dispose(&out);
  	git_reflog_free(reflog);
  }
  

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