[PATCH 16/18] entry.c: update submodules when interesting

[Stefan Beller]

Signed-off-by: Stefan Beller <sbel...@google.com>
---
 entry.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/entry.c b/entry.c
index c6eea240b6..d2b512da90 100644
--- a/entry.c
+++ b/entry.c
@@ -2,6 +2,7 @@
 #include "blob.h"
 #include "dir.h"
 #include "streaming.h"
+#include "submodule.h"
 
 static void create_directories(const char *path, int path_len,
                               const struct checkout *state)
@@ -146,6 +147,7 @@ static int write_entry(struct cache_entry *ce,
        unsigned long size;
        size_t wrote, newsize = 0;
        struct stat st;
+       const struct submodule *sub;
 
        if (ce_mode_s_ifmt == S_IFREG) {
                struct stream_filter *filter = get_stream_filter(ce->name,
@@ -203,6 +205,10 @@ static int write_entry(struct cache_entry *ce,
                        return error("cannot create temporary submodule %s", 
path);
                if (mkdir(path, 0777) < 0)
                        return error("cannot create submodule directory %s", 
path);
+               sub = submodule_from_ce(ce);
+               if (sub)
+                       return submodule_move_head(ce->name,
+                               NULL, oid_to_hex(&ce->oid), 
SUBMODULE_MOVE_HEAD_FORCE);
                break;
        default:
                return error("unknown file mode for %s in index", path);
@@ -259,7 +265,31 @@ int checkout_entry(struct cache_entry *ce,
        strbuf_add(&path, ce->name, ce_namelen(ce));
 
        if (!check_path(path.buf, path.len, &st, state->base_dir_len)) {
+               const struct submodule *sub;
                unsigned changed = ce_match_stat(ce, &st, 
CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
+               /*
+                * Needs to be checked before !changed returns early,
+                * as the possibly empty directory was not changed
+                */
+               sub = submodule_from_ce(ce);
+               if (sub) {
+                       int err;
+                       if (!is_submodule_populated_gently(ce->name, &err)) {
+                               struct stat sb;
+                               if (lstat(ce->name, &sb))
+                                       die(_("could not stat file '%s'"), 
ce->name);
+                               if (!(st.st_mode & S_IFDIR))
+                                       unlink_or_warn(ce->name);
+
+                               return submodule_move_head(ce->name,
+                                       NULL, oid_to_hex(&ce->oid),
+                                       SUBMODULE_MOVE_HEAD_FORCE);
+                       } else
+                               return submodule_move_head(ce->name,
+                                       "HEAD", oid_to_hex(&ce->oid),
+                                       SUBMODULE_MOVE_HEAD_FORCE);
+               }
+
                if (!changed)
                        return 0;
                if (!state->force) {
-- 
2.12.0.rc1.52.ge239d7e709.dirty