worktree: add per-worktree config files

A new repo extension is added, worktreeConfig. When it is present:

 - Repository config reading by default includes $GIT_DIR/config _and_
   $GIT_DIR/config.worktree. "config" file remains shared in multiple
   worktree setup.

 - The special treatment for core.bare and core.worktree, to stay
   effective only in main worktree, is gone. These config settings are
   supposed to be in config.worktree.

This extension is most useful in multiple worktree setup because you
now have an option to store per-worktree config (which is either
.git/config.worktree for main worktree, or
.git/worktrees/xx/config.worktree for linked ones).

This extension can be used in single worktree mode, even though it's
pretty much useless (but this can happen after you remove all linked
worktrees and move back to single worktree).

"git config" reads from both "config" and "config.worktree" by default
(i.e. without either --user, --file...) when this extension is
present. Default writes still go to "config", not "config.worktree". A
new option --worktree is added for that (*).

Since a new repo extension is introduced, existing git binaries should
refuse to access to the repo (both from main and linked worktrees). So
they will not misread the config file (i.e. skip the config.worktree
part). They may still accidentally write to the config file anyway if
they use with "git config --file <path>".

This design places a bet on the assumption that the majority of config
variables are shared so it is the default mode. A safer move would be
default writes go to per-worktree file, so that accidental changes are
isolated.

(*) "git config --worktree" points back to "config" file when this
    extension is not present and there is only one worktree so that it
    works in any both single and multiple worktree setups.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 552827935ae16d809a26e937d53ef07710526264..244560a35e35708dddc744ec6d55ff1953b0a380 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -2,8 +2,9 @@ CONFIGURATION FILE
 ------------------
 
 The Git configuration file contains a number of variables that affect
-the Git commands' behavior. The `.git/config` file in each repository
-is used to store the configuration for that repository, and
+the Git commands' behavior. The files `.git/config` and optionally
+`config.worktree` (see `extensions.worktreeConfig` below) in each
+repository are used to store the configuration for that repository, and
 `$HOME/.gitconfig` is used to store a per-user configuration as
 fallback values for the `.git/config` file. The file `/etc/gitconfig`
 can be used to store a system-wide default configuration.
@@ -371,6 +372,13 @@ advice.*::
                editor input from the user.
 --
 
+extensions.worktreeConfig::
+       If set, by default "git config" reads from both "config" and
+       "config.worktree" file from GIT_DIR in that order. In
+       multiple working directory mode, "config" file is shared while
+       "config.worktree" is per-working directory (i.e., it's in
+       GIT_COMMON_DIR/worktrees/<id>/config.worktree)
+
 core.fileMode::
        Tells Git if the executable bit of files in the working tree
        is to be honored.

diff --git a/Documentation/git-config.txt b/Documentation/git-config.txt
index 5e87d82933e77aec1e9f8a715b264d72521e8bc9..1bfe9f56a7b9b983a2d927406dc17ff384e715a2 100644 (file)
--- a/Documentation/git-config.txt
+++ b/Documentation/git-config.txt
@@ -45,13 +45,15 @@ unset an existing `--type` specifier with `--no-type`.
 
 When reading, the values are read from the system, global and
 repository local configuration files by default, and options
-`--system`, `--global`, `--local` and `--file <filename>` can be
-used to tell the command to read from only that location (see <<FILES>>).
+`--system`, `--global`, `--local`, `--worktree` and
+`--file <filename>` can be used to tell the command to read from only
+that location (see <<FILES>>).
 
 When writing, the new value is written to the repository local
 configuration file by default, and options `--system`, `--global`,
-`--file <filename>` can be used to tell the command to write to
-that location (you can say `--local` but that is the default).
+`--worktree`, `--file <filename>` can be used to tell the command to
+write to that location (you can say `--local` but that is the
+default).
 
 This command will fail with non-zero status upon error.  Some exit
 codes are:
@@ -131,6 +133,11 @@ from all available files.
 +
 See also <<FILES>>.
 
+--worktree::
+       Similar to `--local` except that `.git/config.worktree` is
+       read from or written to if `extensions.worktreeConfig` is
+       present. If not it's the same as `--local`.
+
 -f config-file::
 --file config-file::
        Use the given config file instead of the one specified by GIT_CONFIG.
@@ -281,6 +288,10 @@ $XDG_CONFIG_HOME/git/config::
 $GIT_DIR/config::
        Repository specific configuration file.
 
+$GIT_DIR/config.worktree::
+       This is optional and is only searched when
+       `extensions.worktreeConfig` is present in $GIT_DIR/config.
+
 If no further options are given, all reading options will read all of these
 files that are available. If the global or the system-wide configuration
 file are not available they will be ignored. If the repository configuration
@@ -299,9 +310,10 @@ configuration file. Note that this also affects options like `--replace-all`
 and `--unset`. *'git config' will only ever change one file at a time*.
 
 You can override these rules either by command-line options or by environment
-variables. The `--global` and the `--system` options will limit the file used
-to the global or system-wide file respectively. The `GIT_CONFIG` environment
-variable has a similar effect, but you can specify any filename you want.
+variables. The `--global`, `--system` and `--worktree` options will limit
+the file used to the global, system-wide or per-worktree file respectively.
+The `GIT_CONFIG` environment variable has a similar effect, but you
+can specify any filename you want.
 
 
 ENVIRONMENT

diff --git a/Documentation/git-worktree.txt b/Documentation/git-worktree.txt
index e2ee9fc21b400b01b006d5460698f0229e23ff9f..408c87c9efc51d5fb6ae07342f043eb317cf7657 100644 (file)
--- a/Documentation/git-worktree.txt
+++ b/Documentation/git-worktree.txt
@@ -204,6 +204,36 @@ working trees, it can be used to identify worktrees. For example if
 you only have two working trees, at "/abc/def/ghi" and "/abc/def/ggg",
 then "ghi" or "def/ghi" is enough to point to the former working tree.
 
+CONFIGURATION FILE
+------------------
+By default, the repository "config" file is shared across all working
+trees. If the config variables `core.bare` or `core.worktree` are
+already present in the config file, they will be applied to the main
+working trees only.
+
+In order to have configuration specific to working trees, you can turn
+on "worktreeConfig" extension, e.g.:
+
+------------
+$ git config extensions.worktreeConfig true
+------------
+
+In this mode, specific configuration stays in the path pointed by `git
+rev-parse --git-path config.worktree`. You can add or update
+configuration in this file with `git config --worktree`. Older Git
+versions will refuse to access repositories with this extension.
+
+Note that in this file, the exception for `core.bare` and `core.worktree`
+is gone. If you have them in $GIT_DIR/config before, you must move
+them to the `config.worktree` of the main working tree. You may also
+take this opportunity to review and move other configuration that you
+do not want to share to all working trees:
+
+ - `core.worktree` and `core.bare` should never be shared
+
+ - `core.sparseCheckout` is recommended per working tree, unless you
+   are sure you always use sparse checkout for all working trees.
+
 DETAILS
 -------
 Each linked working tree has a private sub-directory in the repository's
@@ -253,6 +283,9 @@ to `/path/main/.git/worktrees/test-next` then a file named
 `test-next` entry from being pruned.  See
 linkgit:gitrepository-layout[5] for details.
 
+When extensions.worktreeConfig is enabled, the config file
+`.git/worktrees/<id>/config.worktree` is read after `.git/config` is.
+
 LIST OUTPUT FORMAT
 ------------------
 The worktree list command has two output formats.  The default format shows the

diff --git a/Documentation/gitrepository-layout.txt b/Documentation/gitrepository-layout.txt
index e85148f05eb79a968ad84bac6ce7a88289270c49..36fcca80875b524480ca97be5ef668886c29eabb 100644 (file)
--- a/Documentation/gitrepository-layout.txt
+++ b/Documentation/gitrepository-layout.txt
@@ -143,6 +143,11 @@ config::
        if $GIT_COMMON_DIR is set and "$GIT_COMMON_DIR/config" will be
        used instead.
 
+config.worktree::
+       Working directory specific configuration file for the main
+       working directory in multiple working directory setup (see
+       linkgit:git-worktree[1]).
+
 branches::
        A slightly deprecated way to store shorthands to be used
        to specify a URL to 'git fetch', 'git pull' and 'git push'.
@@ -275,6 +280,9 @@ worktrees/<id>/locked::
        or manually by `git worktree prune`. The file may contain a string
        explaining why the repository is locked.
 
+worktrees/<id>/config.worktree::
+       Working directory specific configuration file.
+
 SEE ALSO
 --------
 linkgit:git-init[1],

diff --git a/builtin/config.c b/builtin/config.c
index 97b58c4aeac4a390148192578d92191407ec7e13..84385ef165195e7c65be54e9463cb49578bec2bb 100644 (file)
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -5,6 +5,7 @@
 #include "parse-options.h"
 #include "urlmatch.h"
 #include "quote.h"
+#include "worktree.h"
 
 static const char *const builtin_config_usage[] = {
        N_("git config [<options>]"),
@@ -24,6 +25,7 @@ static char key_delim = ' ';
 static char term = '\n';
 
 static int use_global_config, use_system_config, use_local_config;
+static int use_worktree_config;
 static struct git_config_source given_config_source;
 static int actions, type;
 static char *default_value;
@@ -123,6 +125,7 @@ static struct option builtin_config_options[] = {
        OPT_BOOL(0, "global", &use_global_config, N_("use global config file")),
        OPT_BOOL(0, "system", &use_system_config, N_("use system config file")),
        OPT_BOOL(0, "local", &use_local_config, N_("use repository config file")),
+       OPT_BOOL(0, "worktree", &use_worktree_config, N_("use per-worktree config file")),
        OPT_STRING('f', "file", &given_config_source.file, N_("file"), N_("use given config file")),
        OPT_STRING(0, "blob", &given_config_source.blob, N_("blob-id"), N_("read config from given blob object")),
        OPT_GROUP(N_("Action")),
@@ -602,6 +605,7 @@ int cmd_config(int argc, const char **argv, const char *prefix)
                             PARSE_OPT_STOP_AT_NON_OPTION);
 
        if (use_global_config + use_system_config + use_local_config +
+           use_worktree_config +
            !!given_config_source.file + !!given_config_source.blob > 1) {
                error(_("only one config file at a time"));
                usage_builtin_config();
@@ -645,7 +649,20 @@ int cmd_config(int argc, const char **argv, const char *prefix)
                given_config_source.file = git_etc_gitconfig();
        else if (use_local_config)
                given_config_source.file = git_pathdup("config");
-       else if (given_config_source.file) {
+       else if (use_worktree_config) {
+               struct worktree **worktrees = get_worktrees(0);
+               if (repository_format_worktree_config)
+                       given_config_source.file = git_pathdup("config.worktree");
+               else if (worktrees[0] && worktrees[1])
+                       die(_("--worktree cannot be used with multiple "
+                             "working trees unless the config\n"
+                             "extension worktreeConfig is enabled. "
+                             "Please read \"CONFIGURATION FILE\"\n"
+                             "section in \"git help worktree\" for details"));
+               else
+                       given_config_source.file = git_pathdup("config");
+               free_worktrees(worktrees);
+       } else if (given_config_source.file) {
                if (!is_absolute_path(given_config_source.file) && prefix)
                        given_config_source.file =
                                prefix_filename(prefix, given_config_source.file);

diff --git a/cache.h b/cache.h
index 59c8a930466d034ea2ce84b362e464803e19a100..8fd1bb2a5758afeac7f98b24331fa4a6d93c9ad0 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -960,11 +960,13 @@ extern int grafts_replace_parents;
 extern int repository_format_precious_objects;
 extern char *repository_format_partial_clone;
 extern const char *core_partial_clone_filter_default;
+extern int repository_format_worktree_config;
 
 struct repository_format {
        int version;
        int precious_objects;
        char *partial_clone; /* value of extensions.partialclone */
+       int worktree_config;
        int is_bare;
        int hash_algo;
        char *work_tree;

diff --git a/config.c b/config.c
index 4051e388230afb1fe96f1ffad35fcc36425d247b..aa0ed854f68f530c90cf00eb2d496b64734aa4ce 100644 (file)
--- a/config.c
+++ b/config.c
@@ -1695,6 +1695,17 @@ static int do_git_config_sequence(const struct config_options *opts,
        if (repo_config && !access_or_die(repo_config, R_OK, 0))
                ret += git_config_from_file(fn, repo_config, data);
 
+       /*
+        * Note: this should have a new scope, CONFIG_SCOPE_WORKTREE.
+        * But let's not complicate things before it's actually needed.
+        */
+       if (repository_format_worktree_config) {
+               char *path = git_pathdup("config.worktree");
+               if (!access_or_die(path, R_OK, 0))
+                       ret += git_config_from_file(fn, path, data);
+               free(path);
+       }
+
        current_parsing_scope = CONFIG_SCOPE_CMDLINE;
        if (git_config_from_parameters(fn, data) < 0)
                die(_("unable to parse command-line config"));

diff --git a/environment.c b/environment.c
index 3f3c8746c2b6e30c5d9e40772078a39c3a9638c8..268310b3dc8228152478b2b2f273c06518ee353f 100644 (file)
--- a/environment.c
+++ b/environment.c
@@ -33,6 +33,7 @@ int ref_paranoia = -1;
 int repository_format_precious_objects;
 char *repository_format_partial_clone;
 const char *core_partial_clone_filter_default;
+int repository_format_worktree_config;
 const char *git_commit_encoding;
 const char *git_log_output_encoding;
 const char *apply_default_whitespace;

diff --git a/setup.c b/setup.c
index b24c811c1c3129c8f11fa0fffa4e937705792e36..1be5037f129646cd46d3dc048e8f58dc3bdac0b9 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -402,6 +402,20 @@ void setup_work_tree(void)
        initialized = 1;
 }
 
+static int read_worktree_config(const char *var, const char *value, void *vdata)
+{
+       struct repository_format *data = vdata;
+
+       if (strcmp(var, "core.bare") == 0) {
+               data->is_bare = git_config_bool(var, value);
+       } else if (strcmp(var, "core.worktree") == 0) {
+               if (!value)
+                       return config_error_nonbool(var);
+               data->work_tree = xstrdup(value);
+       }
+       return 0;
+}
+
 static int check_repo_format(const char *var, const char *value, void *vdata)
 {
        struct repository_format *data = vdata;
@@ -423,16 +437,13 @@ static int check_repo_format(const char *var, const char *value, void *vdata)
                        if (!value)
                                return config_error_nonbool(var);
                        data->partial_clone = xstrdup(value);
-               } else
+               } else if (!strcmp(ext, "worktreeconfig"))
+                       data->worktree_config = git_config_bool(var, value);
+               else
                        string_list_append(&data->unknown_extensions, ext);
-       } else if (strcmp(var, "core.bare") == 0) {
-               data->is_bare = git_config_bool(var, value);
-       } else if (strcmp(var, "core.worktree") == 0) {
-               if (!value)
-                       return config_error_nonbool(var);
-               data->work_tree = xstrdup(value);
        }
-       return 0;
+
+       return read_worktree_config(var, value, vdata);
 }
 
 static int check_repository_format_gently(const char *gitdir, struct repository_format *candidate, int *nongit_ok)
@@ -466,7 +477,20 @@ static int check_repository_format_gently(const char *gitdir, struct repository_
 
        repository_format_precious_objects = candidate->precious_objects;
        repository_format_partial_clone = candidate->partial_clone;
+       repository_format_worktree_config = candidate->worktree_config;
        string_list_clear(&candidate->unknown_extensions, 0);
+
+       if (repository_format_worktree_config) {
+               /*
+                * pick up core.bare and core.worktree from per-worktree
+                * config if present
+                */
+               strbuf_addf(&sb, "%s/config.worktree", gitdir);
+               git_config_from_file(read_worktree_config, sb.buf, candidate);
+               strbuf_release(&sb);
+               has_common = 0;
+       }
+
        if (!has_common) {
                if (candidate->is_bare != -1) {
                        is_bare_repository_cfg = candidate->is_bare;

diff --git a/t/t2029-worktree-config.sh b/t/t2029-worktree-config.sh
new file mode 100755 (executable)
index 0000000..286121d
--- /dev/null
+++ b/t/t2029-worktree-config.sh
@@ -0,0 +1,79 @@
+#!/bin/sh
+
+test_description="config file in multi worktree"
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+       test_commit start
+'
+
+test_expect_success 'config --worktree in single worktree' '
+       git config --worktree foo.bar true &&
+       test_cmp_config true foo.bar
+'
+
+test_expect_success 'add worktrees' '
+       git worktree add wt1 &&
+       git worktree add wt2
+'
+
+test_expect_success 'config --worktree without extension' '
+       test_must_fail git config --worktree foo.bar false
+'
+
+test_expect_success 'enable worktreeConfig extension' '
+       git config extensions.worktreeConfig true &&
+       test_cmp_config true extensions.worktreeConfig
+'
+
+test_expect_success 'config is shared as before' '
+       git config this.is shared &&
+       test_cmp_config shared this.is &&
+       test_cmp_config -C wt1 shared this.is &&
+       test_cmp_config -C wt2 shared this.is
+'
+
+test_expect_success 'config is shared (set from another worktree)' '
+       git -C wt1 config that.is also-shared &&
+       test_cmp_config also-shared that.is &&
+       test_cmp_config -C wt1 also-shared that.is &&
+       test_cmp_config -C wt2 also-shared that.is
+'
+
+test_expect_success 'config private to main worktree' '
+       git config --worktree this.is for-main &&
+       test_cmp_config for-main this.is &&
+       test_cmp_config -C wt1 shared this.is &&
+       test_cmp_config -C wt2 shared this.is
+'
+
+test_expect_success 'config private to linked worktree' '
+       git -C wt1 config --worktree this.is for-wt1 &&
+       test_cmp_config for-main this.is &&
+       test_cmp_config -C wt1 for-wt1 this.is &&
+       test_cmp_config -C wt2 shared this.is
+'
+
+test_expect_success 'core.bare no longer for main only' '
+       test_config core.bare true &&
+       test "$(git rev-parse --is-bare-repository)" = true &&
+       test "$(git -C wt1 rev-parse --is-bare-repository)" = true &&
+       test "$(git -C wt2 rev-parse --is-bare-repository)" = true
+'
+
+test_expect_success 'per-worktree core.bare is picked up' '
+       git -C wt1 config --worktree core.bare true &&
+       test "$(git rev-parse --is-bare-repository)" = false &&
+       test "$(git -C wt1 rev-parse --is-bare-repository)" = true &&
+       test "$(git -C wt2 rev-parse --is-bare-repository)" = false
+'
+
+test_expect_success 'config.worktree no longer read without extension' '
+       git config --unset extensions.worktreeConfig &&
+       test_cmp_config shared this.is &&
+       test_cmp_config -C wt1 shared this.is &&
+       test_cmp_config -C wt2 shared this.is
+'
+
+test_done