[PATCH 22/22] ensure_submodule: fetch missing revisions

[skimo@liacs.nl]

From: Sven Verdoolaege <skimo@kotnet.org>

Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>
---
 t/t3042-subprojects-fetch.sh |   46 ++++++++++++++++++++++++++++++++++++++++++
 unpack-trees.c               |   26 +++++++++++++++++++++++
 2 files changed, 72 insertions(+), 0 deletions(-)
 create mode 100755 t/t3042-subprojects-fetch.sh

diff --git a/t/t3042-subprojects-fetch.sh b/t/t3042-subprojects-fetch.sh
new file mode 100755
index 0000000..1acc1bd
--- /dev/null
+++ b/t/t3042-subprojects-fetch.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+
+test_description='submodule fetch'
+. ./test-lib.sh
+
+test_create_repo orig
+
+test_expect_success 'submodule creation' \
+    '(mkdir orig/A && cd orig/A &&
+      git init &&
+      echo 1 > a &&
+      git add a &&
+      git commit -m "create submodule" || exit $? )'
+
+test_expect_success 'supermodule creation' \
+    '(cd orig &&
+     git add A &&
+     git commit -m "supermodule creation" &&
+     git branch one &&
+     git config 'submodule.A.url' $(pwd)/A || exit $?)'
+
+test_expect_success 'clone supermodule' \
+    'git clone --submodules orig clone &&
+     echo 1 > expected &&
+     git diff expected clone/A/a'
+
+test_expect_success 'submodule change' \
+    '(cd orig/A &&
+      echo 2 > a &&
+      git add a &&
+      git commit -m "change submodule" || exit $? )'
+
+test_expect_success 'supermodule change' \
+    '(cd orig &&
+     git add A &&
+     git commit -m "supermodule change" || exit $? )'
+
+test_expect_success 'pull changes' \
+    '(cd clone &&
+      git pull || exit $? )'
+
+test_expect_success 'check pulled changes' \
+    'echo 2 > expected &&
+     git diff expected clone/A/a'
+
+test_done
diff --git a/unpack-trees.c b/unpack-trees.c
index ddefb51..1a76a29 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -7,6 +7,7 @@
 #include "progress.h"
 #include "refs.h"
 #include "submodules.h"
+#include "run-command.h"
 
 #define DBRT_DEBUG 1
 
@@ -810,6 +811,9 @@ static int ensure_submodule(struct cache_entry *ce,
 {
 	struct stat st;
 	char *path;
+	const char *argv_check[10];
+	const char *argv_fetch[] = {"fetch", NULL};
+	int argc;
 
 	if (!ce)
 		return 0;
@@ -826,10 +830,32 @@ static int ensure_submodule(struct cache_entry *ce,
 		if (lstat(path, &st)) {
 			if (clone_submodule(ce->name))
 				return -1;
+			/* may have been overwritten */
+			path = git_path("submodules/%s/.git", ce->name);
 		}
 	}
 
 	/* Now check that the commit is available and fetch if needed */
+	argc = 0;
+	argv_check[argc++] = "cat-file";
+	argv_check[argc++] = "-t";
+	argv_check[argc++] = sha1_to_hex(ce->sha1);
+	argv_check[argc] = NULL;
+
+	if (run_command_v_opt_cd(argv_check,
+	    RUN_GIT_CMD|RUN_COMMAND_CLEAR_GIT_ENV|RUN_COMMAND_NO_STDOUT|
+	    RUN_COMMAND_NO_STDERR, path)) {
+		if (run_command_v_opt_cd(argv_fetch,
+		    RUN_GIT_CMD|RUN_COMMAND_CLEAR_GIT_ENV, path))
+			return error("Unable to fetch submodule '%s'", ce->name);
+
+		if (run_command_v_opt_cd(argv_check,
+		    RUN_GIT_CMD|RUN_COMMAND_CLEAR_GIT_ENV|RUN_COMMAND_NO_STDOUT|
+		    RUN_COMMAND_NO_STDERR, path))
+			return error(
+			    "Unable to fetch revision %s for submodule '%s'",
+			    sha1_to_hex(ce->sha1), ce->name);
+	}
 
 	return 0;
 }
-- 
1.5.2.784.g5532e