Enable minimal stat checking

Specifically the fields uid, gid, ctime, ino and dev are set to zero
by JGit. Other implementations, eg. Git in cygwin are allegedly also
somewhat incompatible with Git For Windows and on *nix platforms
the resolution of the timestamps may differ.

Any stat checking by git will then need to check content, which may
be very slow, particularly on Windows. Since mtime and size
is typically enough we should allow the user to tell git to avoid
checking these fields if they are set to zero in the index.

This change introduces a core.checkstat config option where the
the user can select to check all fields (default), or just size
and the whole second part of mtime (minimal).

Signed-off-by: Robin Rosenberg <robin.rosenberg@dewire.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/config.txt b/Documentation/config.txt
index b87f7446436ea73ffeb062317ea9869051d5be78..d7ec507003312f731c869958ce3ed4644697806e 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -235,6 +235,12 @@ core.trustctime::
        crawlers and some backup systems).
        See linkgit:git-update-index[1]. True by default.
 
+core.checkstat::
+       Determines which stat fields to match between the index
+       and work tree. The user can set this to 'default' or
+       'minimal'. Default (or explicitly 'default'), is to check
+       all fields, including the sub-second part of mtime and ctime.
+
 core.quotepath::
        The commands that output paths (e.g. 'ls-files',
        'diff'), when not given the `-z` option, will quote

diff --git a/cache.h b/cache.h
index c257953fa798110e0f4be9258f4f88f2d7952bdb..ab20c4ddf3d68398f4cad5d53d4cde013703bbec 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -536,6 +536,7 @@ extern int delete_ref(const char *, const unsigned char *sha1, int delopt);
 /* Environment bits from configuration mechanism */
 extern int trust_executable_bit;
 extern int trust_ctime;
+extern int check_stat;
 extern int quote_path_fully;
 extern int has_symlinks;
 extern int minimum_abbrev, default_abbrev;

diff --git a/config.c b/config.c
index 7b444b68abcebb5829a5628ee5b74cf3f0020c0b..3f638e3c00c9ee5000a0f3d3518fd1e7bc1457b6 100644 (file)
--- a/config.c
+++ b/config.c
@@ -566,6 +566,12 @@ static int git_default_core_config(const char *var, const char *value)
                trust_ctime = git_config_bool(var, value);
                return 0;
        }
+       if (!strcmp(var, "core.statinfo")) {
+               if (!strcasecmp(value, "default"))
+                       check_stat = 1;
+               else if (!strcasecmp(value, "minimal"))
+                       check_stat = 0;
+       }
 
        if (!strcmp(var, "core.quotepath")) {
                quote_path_fully = git_config_bool(var, value);

diff --git a/environment.c b/environment.c
index 85edd7f95adecd8316b49638d7bda2841839206d..e828b371f58d5e4cd0a24b3b3b24b35b785edeba 100644 (file)
--- a/environment.c
+++ b/environment.c
@@ -13,6 +13,7 @@
 
 int trust_executable_bit = 1;
 int trust_ctime = 1;
+int check_stat = 1;
 int has_symlinks = 1;
 int minimum_abbrev = 4, default_abbrev = 7;
 int ignore_case;

diff --git a/read-cache.c b/read-cache.c
index fda78bc353afcfd4d01864f2a13158d9c9c55173..827ae55c508addf5c058872e554a3d914389e324 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -197,21 +197,25 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st)
        }
        if (ce->ce_mtime.sec != (unsigned int)st->st_mtime)
                changed |= MTIME_CHANGED;
-       if (trust_ctime && ce->ce_ctime.sec != (unsigned int)st->st_ctime)
+       if (trust_ctime && check_stat &&
+           ce->ce_ctime.sec != (unsigned int)st->st_ctime)
                changed |= CTIME_CHANGED;
 
 #ifdef USE_NSEC
-       if (ce->ce_mtime.nsec != ST_MTIME_NSEC(*st))
+       if (check_stat && ce->ce_mtime.nsec != ST_MTIME_NSEC(*st))
                changed |= MTIME_CHANGED;
-       if (trust_ctime && ce->ce_ctime.nsec != ST_CTIME_NSEC(*st))
+       if (trust_ctime && check_stat &&
+           ce->ce_ctime.nsec != ST_CTIME_NSEC(*st))
                changed |= CTIME_CHANGED;
 #endif
 
-       if (ce->ce_uid != (unsigned int) st->st_uid ||
-           ce->ce_gid != (unsigned int) st->st_gid)
-               changed |= OWNER_CHANGED;
-       if (ce->ce_ino != (unsigned int) st->st_ino)
-               changed |= INODE_CHANGED;
+       if (check_stat) {
+               if (ce->ce_uid != (unsigned int) st->st_uid ||
+                       ce->ce_gid != (unsigned int) st->st_gid)
+                       changed |= OWNER_CHANGED;
+               if (ce->ce_ino != (unsigned int) st->st_ino)
+                       changed |= INODE_CHANGED;
+       }
 
 #ifdef USE_STDEV
        /*
@@ -219,8 +223,8 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st)
         * clients will have different views of what "device"
         * the filesystem is on
         */
-       if (ce->ce_dev != (unsigned int) st->st_dev)
-               changed |= INODE_CHANGED;
+       if (check_stat && ce->ce_dev != (unsigned int) st->st_dev)
+                       changed |= INODE_CHANGED;
 #endif
 
        if (ce->ce_size != (unsigned int) st->st_size)