lock_file(): exit early if lockfile cannot be opened

diff --git a/Documentation/git-sh-setup.txt b/Documentation/git-sh-setup.txt
index 6a9f66d1d920f0bfce1db823e2de3f696ce99f23..4f67c4cde679cf03e8cc43ac0630a45b5e68aa2d 100644 (file)
--- a/Documentation/git-sh-setup.txt
+++ b/Documentation/git-sh-setup.txt
@@ -41,9 +41,11 @@ usage::
        die with the usage message.
 
 set_reflog_action::
-       set the message that will be recorded to describe the
-       end-user action in the reflog, when the script updates a
-       ref.
+       Set GIT_REFLOG_ACTION environment to a given string (typically
+       the name of the program) unless it is already set.  Whenever
+       the script runs a `git` command that updates refs, a reflog
+       entry is created using the value of this string to leave the
+       record of what command updated the ref.
 
 git_editor::
        runs an editor of user's choice (GIT_EDITOR, core.editor, VISUAL or
@@ -82,6 +84,12 @@ get_author_ident_from_commit::
        outputs code for use with eval to set the GIT_AUTHOR_NAME,
        GIT_AUTHOR_EMAIL and GIT_AUTHOR_DATE variables for a given commit.
 
+create_virtual_base::
+       modifies the first file so only lines in common with the
+       second file remain. If there is insufficient common material,
+       then the first file is left empty. The result is suitable
+       as a virtual base input for a 3-way merge.
+
 GIT
 ---
 Part of the linkgit:git[1] suite