Currently submodule.<name>.update is only handled by git-submodule.sh.
C code will start to need to make use of that value as more of the
functionality of git-submodule.sh moves into library code in C.

Add the update field to 'struct submodule' and populate it so it can
be read as sm->update or from sm->update_command.

Signed-off-by: Stefan Beller <sbel...@google.com>
---
 submodule-config.c | 12 ++++++++++++
 submodule-config.h |  2 ++
 submodule.c        | 19 +++++++++++++++++++
 submodule.h        | 16 ++++++++++++++++
 4 files changed, 49 insertions(+)

diff --git a/submodule-config.c b/submodule-config.c
index fe8ceab..254067b 100644
--- a/submodule-config.c
+++ b/submodule-config.c
@@ -194,6 +194,8 @@ static struct submodule *lookup_or_create_by_name(struct 
submodule_cache *cache,
 
        submodule->path = NULL;
        submodule->url = NULL;
+       submodule->update_strategy.type = SM_UPDATE_UNSPECIFIED;
+       submodule->update_strategy.command = NULL;
        submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
        submodule->ignore = NULL;
 
@@ -340,6 +342,16 @@ static int parse_config(const char *var, const char 
*value, void *data)
                        free((void *) submodule->url);
                        submodule->url = xstrdup(value);
                }
+       } else if (!strcmp(item.buf, "update")) {
+               if (!value)
+                       ret = config_error_nonbool(var);
+               else if (!me->overwrite &&
+                        submodule->update_strategy.type != 
SM_UPDATE_UNSPECIFIED)
+                       warn_multiple_config(me->commit_sha1, submodule->name,
+                                            "update");
+               else if (parse_submodule_update_strategy(value,
+                        &submodule->update_strategy) < 0)
+                               die(_("invalid value for %s"), var);
        }
 
        strbuf_release(&name);
diff --git a/submodule-config.h b/submodule-config.h
index 9bfa65a..e4857f5 100644
--- a/submodule-config.h
+++ b/submodule-config.h
@@ -2,6 +2,7 @@
 #define SUBMODULE_CONFIG_CACHE_H
 
 #include "hashmap.h"
+#include "submodule.h"
 #include "strbuf.h"
 
 /*
@@ -14,6 +15,7 @@ struct submodule {
        const char *url;
        int fetch_recurse;
        const char *ignore;
+       struct submodule_update_strategy update_strategy;
        /* the sha1 blob id of the responsible .gitmodules file */
        unsigned char gitmodules_sha1[20];
 };
diff --git a/submodule.c b/submodule.c
index b83939c..8fd4512 100644
--- a/submodule.c
+++ b/submodule.c
@@ -210,6 +210,25 @@ void gitmodules_config(void)
        }
 }
 
+int parse_submodule_update_strategy(const char *value,
+               struct submodule_update_strategy *dst)
+{
+       dst->command = NULL;
+       if (!strcmp(value, "none"))
+               dst->type = SM_UPDATE_NONE;
+       else if (!strcmp(value, "checkout"))
+               dst->type = SM_UPDATE_CHECKOUT;
+       else if (!strcmp(value, "rebase"))
+               dst->type = SM_UPDATE_REBASE;
+       else if (!strcmp(value, "merge"))
+               dst->type = SM_UPDATE_MERGE;
+       else if (skip_prefix(value, "!", &dst->command))
+               dst->type = SM_UPDATE_COMMAND;
+       else
+               return -1;
+       return 0;
+}
+
 void handle_ignore_submodules_arg(struct diff_options *diffopt,
                                  const char *arg)
 {
diff --git a/submodule.h b/submodule.h
index e06eaa5..9a86124 100644
--- a/submodule.h
+++ b/submodule.h
@@ -14,6 +14,20 @@ enum {
        RECURSE_SUBMODULES_ON = 2
 };
 
+enum submodule_update_type {
+       SM_UPDATE_UNSPECIFIED = 0,
+       SM_UPDATE_CHECKOUT,
+       SM_UPDATE_REBASE,
+       SM_UPDATE_MERGE,
+       SM_UPDATE_NONE,
+       SM_UPDATE_COMMAND
+};
+
+struct submodule_update_strategy {
+       enum submodule_update_type type;
+       const char *command;
+};
+
 int is_staging_gitmodules_ok(void);
 int update_path_in_gitmodules(const char *oldpath, const char *newpath);
 int remove_path_from_gitmodules(const char *path);
@@ -22,6 +36,8 @@ void set_diffopt_flags_from_submodule_config(struct 
diff_options *diffopt,
                const char *path);
 int submodule_config(const char *var, const char *value, void *cb);
 void gitmodules_config(void);
+int parse_submodule_update_strategy(const char *value,
+               struct submodule_update_strategy *dst);
 void handle_ignore_submodules_arg(struct diff_options *diffopt, const char *);
 void show_submodule_summary(FILE *f, const char *path,
                const char *line_prefix,
-- 
2.7.1.292.g18a4ced.dirty

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