Commit 5b65ac25780cc4c18c965e3202e2e882bd25d941
2017-04-05T10:43:18
refs: implement function to read references from file Currently, we only provide functions to read references directly from a repository's reference store via e.g. `git_reference_lookup`. But in some cases, we may want to read files not connected to the current repository, e.g. when looking up HEAD of connected work trees. This commit implements `git_reference__read_head`, which will read out and allocate a reference at an arbitrary path.
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diff --git a/src/refs.c b/src/refs.c
index 0837dc4..a53d094 100644
--- a/src/refs.c
+++ b/src/refs.c
@@ -249,6 +249,40 @@ int git_reference_lookup_resolved(
return 0;
}
+int git_reference__read_head(
+ git_reference **out,
+ git_repository *repo,
+ const char *path)
+{
+ git_buf reference = GIT_BUF_INIT;
+ char *name = NULL;
+ int error;
+
+ if ((error = git_futils_readbuffer(&reference, path)) < 0)
+ goto out;
+ git_buf_rtrim(&reference);
+
+ if (git__strncmp(reference.ptr, GIT_SYMREF, strlen(GIT_SYMREF)) == 0) {
+ git_buf_consume(&reference, reference.ptr + strlen(GIT_SYMREF));
+
+ name = git_path_basename(path);
+
+ if ((*out = git_reference__alloc_symbolic(name, reference.ptr)) == NULL) {
+ error = -1;
+ goto out;
+ }
+ } else {
+ if ((error = git_reference_lookup(out, repo, reference.ptr)) < 0)
+ goto out;
+ }
+
+out:
+ free(name);
+ git_buf_clear(&reference);
+
+ return error;
+}
+
int git_reference_dwim(git_reference **out, git_repository *repo, const char *refname)
{
int error = 0, i;
diff --git a/src/refs.h b/src/refs.h
index 80e655a..0c90db3 100644
--- a/src/refs.h
+++ b/src/refs.h
@@ -107,6 +107,20 @@ int git_reference_lookup_resolved(
const char *name,
int max_deref);
+/**
+ * Read reference from a file.
+ *
+ * This function will read in the file at `path`. If it is a
+ * symref, it will return a new unresolved symbolic reference
+ * with the given name pointing to the reference pointed to by
+ * the file. If it is not a symbolic reference, it will return
+ * the resolved reference.
+ */
+int git_reference__read_head(
+ git_reference **out,
+ git_repository *repo,
+ const char *path);
+
int git_reference__log_signature(git_signature **out, git_repository *repo);
/** Update a reference after a commit. */