merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'

third_party/git/branch.h

@@ -0,0 +1,103 @@
+#ifndef BRANCH_H
+#define BRANCH_H
+
+struct repository;
+struct strbuf;
+
+enum branch_track {
+	BRANCH_TRACK_UNSPECIFIED = -1,
+	BRANCH_TRACK_NEVER = 0,
+	BRANCH_TRACK_REMOTE,
+	BRANCH_TRACK_ALWAYS,
+	BRANCH_TRACK_EXPLICIT,
+	BRANCH_TRACK_OVERRIDE
+};
+
+extern enum branch_track git_branch_track;
+
+/* Functions for acting on the information about branches. */
+
+/*
+ * Creates a new branch, where:
+ *
+ *   - r is the repository to add a branch to
+ *
+ *   - name is the new branch name
+ *
+ *   - start_name is the name of the existing branch that the new branch should
+ *     start from
+ *
+ *   - force enables overwriting an existing (non-head) branch
+ *
+ *   - clobber_head_ok allows the currently checked out (hence existing)
+ *     branch to be overwritten; without 'force', it has no effect.
+ *
+ *   - reflog creates a reflog for the branch
+ *
+ *   - quiet suppresses tracking information
+ *
+ *   - track causes the new branch to be configured to merge the remote branch
+ *     that start_name is a tracking branch for (if any).
+ *
+ */
+void create_branch(struct repository *r,
+		   const char *name, const char *start_name,
+		   int force, int clobber_head_ok,
+		   int reflog, int quiet, enum branch_track track);
+
+/*
+ * Check if 'name' can be a valid name for a branch; die otherwise.
+ * Return 1 if the named branch already exists; return 0 otherwise.
+ * Fill ref with the full refname for the branch.
+ */
+int validate_branchname(const char *name, struct strbuf *ref);
+
+/*
+ * Check if a branch 'name' can be created as a new branch; die otherwise.
+ * 'force' can be used when it is OK for the named branch already exists.
+ * Return 1 if the named branch already exists; return 0 otherwise.
+ * Fill ref with the full refname for the branch.
+ */
+int validate_new_branchname(const char *name, struct strbuf *ref, int force);
+
+/*
+ * Remove information about the merge state on the current
+ * branch. (E.g., MERGE_HEAD)
+ */
+void remove_merge_branch_state(struct repository *r);
+
+/*
+ * Remove information about the state of working on the current
+ * branch. (E.g., MERGE_HEAD)
+ */
+void remove_branch_state(struct repository *r, int verbose);
+
+/*
+ * Configure local branch "local" as downstream to branch "remote"
+ * from remote "origin".  Used by git branch --set-upstream.
+ * Returns 0 on success.
+ */
+#define BRANCH_CONFIG_VERBOSE 01
+int install_branch_config(int flag, const char *local, const char *origin, const char *remote);
+
+/*
+ * Read branch description
+ */
+int read_branch_desc(struct strbuf *, const char *branch_name);
+
+/*
+ * Check if a branch is checked out in the main worktree or any linked
+ * worktree and die (with a message describing its checkout location) if
+ * it is.
+ */
+void die_if_checked_out(const char *branch, int ignore_current_worktree);
+
+/*
+ * Update all per-worktree HEADs pointing at the old ref to point the new ref.
+ * This will be used when renaming a branch. Returns 0 if successful, non-zero
+ * otherwise.
+ */
+int replace_each_worktree_head_symref(const char *oldref, const char *newref,
+				      const char *logmsg);
+
+#endif