CL/git: add format version 1

[notmuch] / doc / man1 / notmuch-git.rst

diff --git a/doc/man1/notmuch-git.rst b/doc/man1/notmuch-git.rst
index 6a2d7fcd9b03b314edf4f950c2e2a68945a5c51d..59d02fb4d11702ed513778a9878f7dd42d50165c 100644 (file)
--- a/doc/man1/notmuch-git.rst
+++ b/doc/man1/notmuch-git.rst
@@ -73,13 +73,18 @@ Dump a tar archive of a committed tag set using 'git archive'. See
    :manpage:`git-archive(1)`. Arguments to `git-archive` are reordered
    so that *tree-ish* comes last.
 
-.. option:: checkout
+.. option:: checkout [-f|--force]
 
 Update the notmuch database from Git.
 
 This is mainly useful to discard your changes in notmuch relative
 to Git.
 
+   .. describe:: [-f|--force]
+
+   Override checks that prevent modifying tags for large fractions of
+   messages in the database. See also :nmconfig:`git.safe_fraction`.
+
 .. option:: clone <repository>
 
 Create a local `notmuch git` repository from a remote source.
@@ -94,7 +99,7 @@ upstreams.
     section of :manpage:`git-clone(1)` for more information on
     specifying repositories.
 
-.. option:: commit [message]
+.. option:: commit [-f|--force] [message]
 
 Commit prefix-matching tags from the notmuch database to Git.
 
@@ -102,6 +107,11 @@ Commit prefix-matching tags from the notmuch database to Git.
 
    Optional text for the commit message.
 
+   .. describe:: -f|--force
+
+   Override checks that prevent modifying tags for large fractions of
+   messages in the database. See also :nmconfig:`git.safe_fraction`.
+
 .. option:: fetch [remote]
 
 Fetch changes from the remote repository.
@@ -225,14 +235,46 @@ REPOSITORY CONTENTS
 ===================
 
 The tags are stored in the git repo (and exported) as a set of empty
-files. For a message with Message-Id *id*, for each tag *tag*, there
+files. These empty files are contained within a directory named after
+the message-id.
+
+In what follows `encode()` represents a POSIX filesystem safe
+encoding. The encoding preserves alphanumerics, and the characters
+`+-_@=.,:`.  All other octets are replaced with `%` followed by a two
+digit hex number.
+
+Currently :any:`notmuch-git` can read any format version, but can only
+create (via :any:`init`) :ref:`version 1 <format_version_1>` repositories.
+
+.. _format_version_0:
+
+Version 0
+---------
+
+This is the legacy format created by the `nmbug` tool prior to release
+0.37.  For a message with Message-Id *id*, for each tag *tag*, there
 is an empty file with path
 
        tags/ `encode` (*id*) / `encode` (*tag*)
 
-The encoding preserves alphanumerics, and the characters `+-_@=.,:`.
-All other octets are replaced with `%` followed by a two digit hex
-number.
+.. _format_version_1:
+
+Version 1
+---------
+
+In format version 1 and later, the format version is contained in a
+top level file called FORMAT.
+
+For a message with Message-Id *id*, for each tag *tag*, there
+is an empty file with path
+
+       tags/ `hash1` (*id*) / `hash2` (*id*) `encode` (*id*) / `encode` (*tag*)
+
+The hash functions each represent one byte of the `blake2b` hex
+digest.
+
+Compared to :ref:`version 0 <format_version_0>`, this reduces the
+number of subdirectories within each directory.
 
 .. _repo_location:
 
@@ -246,6 +288,8 @@ value to locate the git repository.
 
 - Environment variable :envvar:`NOTMUCH_GIT_DIR`.
 
+- Configuration item :nmconfig:`git.path`
+
 - If invoked as `nmbug` or with the :option:`--nmbug` option,
   :code:`$HOME/.nmbug`; otherwise
   :code:`$XDG_DATA_HOME/notmuch/$NOTMUCH_PROFILE/git`.
@@ -262,6 +306,8 @@ value to define the tag prefix.
 
 - Environment variable :envvar:`NOTMUCH_GIT_PREFIX`.
 
+- Configuration item :nmconfig:`git.tag_prefix`.
+
 - If invoked as `nmbug` or with the :option:`--nmbug` option,
   :code:`notmuch::`, otherwise the empty string.