[PATCHv9 1/6] submodule-config: keep update strategy around

[Stefan Beller <sbeller@google.com>]

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 <sbeller@google.com>
---
 submodule-config.c | 22 ++++++++++++++++++++++
 submodule-config.h | 11 +++++++++++
 2 files changed, 33 insertions(+)

diff --git a/submodule-config.c b/submodule-config.c
index afe0ea8..a1af5de 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 = SM_UPDATE_UNSPECIFIED;
+	submodule->update_command = NULL;
 	submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
 	submodule->ignore = NULL;
 
@@ -311,6 +313,26 @@ 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 != SM_UPDATE_UNSPECIFIED)
+			warn_multiple_config(me->commit_sha1, submodule->name,
+					     "update");
+		else {
+			submodule->update_command = NULL;
+			if (!strcmp(value, "none"))
+				submodule->update = SM_UPDATE_NONE;
+			else if (!strcmp(value, "checkout"))
+				submodule->update = SM_UPDATE_CHECKOUT;
+			else if (!strcmp(value, "rebase"))
+				submodule->update = SM_UPDATE_REBASE;
+			else if (!strcmp(value, "merge"))
+				submodule->update = SM_UPDATE_MERGE;
+			else if (!skip_prefix(value, "!", &submodule->update_command))
+				die(_("invalid value for %s"), var);
+		}
 	}
 
 	strbuf_release(&name);
diff --git a/submodule-config.h b/submodule-config.h
index 9061e4e..e3bd56e 100644
--- a/submodule-config.h
+++ b/submodule-config.h
@@ -4,6 +4,15 @@
 #include "hashmap.h"
 #include "strbuf.h"
 
+enum submodule_update_type {
+	SM_UPDATE_CHECKOUT,
+	SM_UPDATE_REBASE,
+	SM_UPDATE_MERGE,
+	SM_UPDATE_NONE,
+	SM_UPDATE_COMMAND,
+	SM_UPDATE_UNSPECIFIED
+};
+
 /*
  * Submodule entry containing the information about a certain submodule
  * in a certain revision.
@@ -14,6 +23,8 @@ struct submodule {
 	const char *url;
 	int fetch_recurse;
 	const char *ignore;
+	enum submodule_update_type update;
+	const char *update_command;
 	/* the sha1 blob id of the responsible .gitmodules file */
 	unsigned char gitmodules_sha1[20];
 };
-- 
2.7.0.rc0.35.gb0f7869.dirty