[PATCH v5 09/11] config: add core.untrackedCache
When we know that mtime is fully supported by the environment, we might want the untracked cache to be always used by default without any mtime test or kernel version check being performed.
Also when we know that mtime is not supported by the environment, for example because the repo is shared over a network file system, we might want the untracked-cache to be automatically remove from the index.
The normal way to achieve the above in Git is to use a config variable. That's why this patch introduces "core.untrackedCache".
This variable is a tristate, `keep`, `false` and `true`, which default to `keep`.
When read_index_from() is called, it now adds or removes the untracked cache in the index to respect the value of this variable. So it does nothing if the value is `keep` or if the variable is unset; it adds the untracked cache if the value is `true`; and it removes the cache if the value is `false`.
`git update-index --[no-|force-]untracked-cache` still adds or removes the untracked cache from the index, but this shows a warning if it goes against the value of core.untrackedCache, as the untracked cache will go back to its previous state the next time read_index_from() is called.
Also `--untracked-cache` used to check that the underlying operating system and file system change `st_mtime` field of a directory if files are added or deleted in that directory. But those tests take a long time and there is now `--test-untracked-cache` to perform them.
That's why, to be more consistent with other git commands, this patch prevents `--untracked-cache` to perform tests, so that after this patch there is no difference any more between `--untracked-cache` and `--force-untracked-cache`.
This last change is backward incompatible and should be mentioned in the release notes.
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Helped-by: Duy Nguyen <pclouds@gmail.com>
Helped-by: Torsten Bögershausen <tboegi@web.de>
---
Documentation/config.txt | 9 +++++
Documentation/git-update-index.txt | 67 ++++++++++++++++++++++++++--------
builtin/update-index.c | 35 ++++++++++++------
cache.h | 1 +
config.c | 20 ++++++++++
contrib/completion/git-completion.bash | 1 +
read-cache.c | 14 +++++++
t/t7063-status-untracked-cache.sh | 4 +-
8 files changed, 122 insertions(+), 29 deletions(-)
Show changes to 8 files +122 −29
Documentation/config.txt, Documentation/git-update-index.txt, builtin/update-index.c, cache.h, config.c, contrib/completion/git-completion.bash, read-cache.c, t/t7063-status-untracked-cache.sh
diff --git a/Documentation/config.txt b/Documentation/config.txt
index beb18da..485aa5e 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -308,6 +308,15 @@ core.trustctime::
crawlers and some backup systems).
See linkgit:git-update-index[1]. True by default.
+core.untrackedCache::
+ Determines what to do about the untracked cache feature of the
+ index. It will be kept, if this variable is unset or set to
+ `keep`. It will automatically be added if set to `true`. And
+ it will automatically be removed, if set to `false`. Before
+ setting it to `true`, you should check that mtime is working
+ properly on your system.
+ See linkgit:git-update-index[1]. `keep` by default.
+
core.checkStat::
Determines which stat fields to match between the index
and work tree. The user can set this to 'default' or
diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt
index a0afe17..5853dcd 100644
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -174,27 +174,30 @@ may not support it yet.
--untracked-cache::
--no-untracked-cache::
- Enable or disable untracked cache extension. This could speed
- up for commands that involve determining untracked files such
- as `git status`. The underlying operating system and file
- system must change `st_mtime` field of a directory if files
- are added or deleted in that directory.
+ Enable or disable untracked cache feature. Please use
+ `--test-untracked-cache` before enabling it.
++
+These options take effect whatever the value of the `core.untrackedCache`
+configuration variable (see linkgit:git-config[1]). But a warning is
+emitted when the change goes against the configured value, as the
+configured value will take effect next time the index is read and this
+will remove the intended effect of the option.
--test-untracked-cache::
Only perform tests on the working directory to make sure
untracked cache can be used. You have to manually enable
- untracked cache using `--force-untracked-cache` (or
- `--untracked-cache` but this will run the tests again)
- afterwards if you really want to use it. If a test fails
- the exit code is 1 and a message explains what is not
- working as needed, otherwise the exit code is 0 and OK is
- printed.
+ untracked cache using `--untracked-cache` or
+ `--force-untracked-cache` or the `core.untrackedCache`
+ configuration variable afterwards if you really want to use
+ it. If a test fails the exit code is 1 and a message
+ explains what is not working as needed, otherwise the exit
+ code is 0 and OK is printed.
--force-untracked-cache::
- For safety, `--untracked-cache` performs tests on the working
- directory to make sure untracked cache can be used. These
- tests can take a few seconds. `--force-untracked-cache` can be
- used to skip the tests.
+ Same as `--untracked-cache`. Provided for backwards
+ compatibility with older versions of Git where
+ `--untracked-cache` used to imply `--test-untracked-cache` but
+ this option would enable the extension unconditionally.
\--::
Do not interpret any more arguments as options.
@@ -385,6 +388,37 @@ Although this bit looks similar to assume-unchanged bit, its goal is
different from assume-unchanged bit's. Skip-worktree also takes
precedence over assume-unchanged bit when both are set.
+Untracked cache
+---------------
+
+This cache could speed up commands that involve determining untracked
+files such as `git status`.
+
+This feature works by recording the mtime of the working tree
+directories and then omitting reading directories and stat calls
+against files in those directories whose mtime hasn't changed. For
+this to work the underlying operating system and file system must
+change the `st_mtime` field of directories if files in the directory
+are added, modified or deleted.
+
+You can test whether the filesystem supports that with the
+`--test-untracked-cache` option. The `--untracked-cache` option used
+to implicitly perform that test in older versions of Git, but that's
+no longer the case.
+
+If you want to enable (or disable) this feature, it is easier to use
+the `core.untrackedCache` configuration variable (see
+linkgit:git-config[1]) than using the `--untracked-cache` option to
+`git update-index` in each repository, especially if you want to do so
+across all repositories you use, because you can set the configuration
+variable to `true` (or `false`) in your `$HOME/.gitconfig` just once
+and have it affect all repositories you touch.
+
+When the `core.untrackedCache` configuration variable is changed, the
+untracked cache is added to or removed from the index the next time a
+command reads the index; while when `--[no-|force-]untracked-cache`
+are used, the untracked cache is immediately added to or removed from
+the index.
Configuration
-------------
@@ -410,6 +444,9 @@ It can be useful when the inode change time is regularly modified by
something outside Git (file system crawlers and backup systems use
ctime for marking files processed) (see linkgit:git-config[1]).
+The untracked cache extension can be enabled by the
+`core.untrackedCache` configuration variable (see
+linkgit:git-config[1]).
SEE ALSO
--------
diff --git a/builtin/update-index.c b/builtin/update-index.c
index d90154c..7a55334 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -1115,19 +1115,32 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
the_index.split_index = NULL;
the_index.cache_changed |= SOMETHING_CHANGED;
}
- if (untracked_cache > UC_DISABLE) {
- if (untracked_cache < UC_FORCE) {
- setup_work_tree();
- if (!test_if_untracked_cache_is_supported())
- return 1;
- if (untracked_cache == UC_TEST)
- return 0;
- }
- add_untracked_cache(&the_index);
- report(_("Untracked cache enabled for '%s'"), get_git_work_tree());
- } else if (untracked_cache == UC_DISABLE) {
+
+ switch (untracked_cache) {
+ case UC_UNSPECIFIED:
+ break;
+ case UC_DISABLE:
+ if (git_config_get_untracked_cache() == 1)
+ warning("core.untrackedCache is set to true; "
+ "remove or change it, if you really want to "
+ "disable the untracked cache");
remove_untracked_cache(&the_index);
report(_("Untracked cache disabled"));
+ break;
+ case UC_TEST:
+ setup_work_tree();
+ return !test_if_untracked_cache_is_supported();
+ case UC_ENABLE:
+ case UC_FORCE:
+ if (git_config_get_untracked_cache() == 0)
+ warning("core.untrackedCache is set to false; "
+ "remove or change it, if you really want to "
+ "enable the untracked cache");
+ add_untracked_cache(&the_index);
+ report(_("Untracked cache enabled for '%s'"), get_git_work_tree());
+ break;
+ default:
+ die("Bug: bad untracked_cache value: %d", untracked_cache);
}
if (active_cache_changed) {
diff --git a/cache.h b/cache.h
index c63fcc1..59a15fd 100644
--- a/cache.h
+++ b/cache.h
@@ -1603,6 +1603,7 @@ extern int git_config_get_bool(const char *key, int *dest);
extern int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest);
extern int git_config_get_maybe_bool(const char *key, int *dest);
extern int git_config_get_pathname(const char *key, const char **dest);
+extern int git_config_get_untracked_cache(void);
struct key_value_info {
const char *filename;
diff --git a/config.c b/config.c
index 86a5eb2..647a15e 100644
--- a/config.c
+++ b/config.c
@@ -1594,6 +1594,26 @@ int git_config_get_pathname(const char *key, const char **dest)
return ret;
}
+int git_config_get_untracked_cache(void)
+{
+ int val = -1;
+ const char *v;
+
+ if (!git_config_get_maybe_bool("core.untrackedcache", &val))
+ return val;
+
+ if (!git_config_get_value("core.untrackedcache", &v)) {
+ if (!strcasecmp(v, "keep"))
+ return -1;
+
+ error("unknown core.untrackedCache value '%s'; "
+ "using 'keep' default value", v);
+ return -1;
+ }
+
+ return -1; /* default value */
+}
+
NORETURN
void git_die_config_linenr(const char *key, const char *filename, int linenr)
{
diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index ab4da7f..de4b5ed 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2056,6 +2056,7 @@ _git_config ()
core.sparseCheckout
core.symlinks
core.trustctime
+ core.untrackedCache
core.warnAmbiguousRefs
core.whitespace
core.worktree
diff --git a/read-cache.c b/read-cache.c
index 84616c8..1d5696c 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1622,6 +1622,20 @@ int read_index_from(struct index_state *istate, const char *path)
return istate->cache_nr;
ret = do_read_index(istate, path, 0);
+
+ switch (git_config_get_untracked_cache()) {
+ case -1: /* keep: do nothing */
+ break;
+ case 0: /* false */
+ remove_untracked_cache(istate);
+ break;
+ case 1: /* true */
+ add_untracked_cache(istate);
+ break;
+ default: /* unknown value: do nothing */
+ break;
+ }
+
split_index = istate->split_index;
if (!split_index || is_null_sha1(split_index->base_sha1)) {
check_ce_order(istate);
diff --git a/t/t7063-status-untracked-cache.sh b/t/t7063-status-untracked-cache.sh
index 0e8d0d4..253160a 100755
--- a/t/t7063-status-untracked-cache.sh
+++ b/t/t7063-status-untracked-cache.sh
@@ -8,10 +8,8 @@ avoid_racy() {
sleep 1
}
-# It's fine if git update-index returns an error code other than one,
-# it'll be caught in the first test.
test_lazy_prereq UNTRACKED_CACHE '
- { git update-index --untracked-cache; ret=$?; } &&
+ { git update-index --test-untracked-cache; ret=$?; } &&
test $ret -ne 1
'
--
2.7.0.36.g20612a7
Christian Couder
