From: Johannes Schindelin <johannes.schinde...@gmx.de>

With this change, the `index_state` struct becomes the new home for the
flag that says whether the fsmonitor hook has been run, i.e. it is now
per-index.

It also gets re-set when the index is discarded, fixing the bug where
fsmonitor-enabled Git would miss updates under certain circumstances.

Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
 cache.h                     | 3 ++-
 fsmonitor.c                 | 5 ++---
 read-cache.c                | 1 +
 t/t7519-status-fsmonitor.sh | 2 +-
 4 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/cache.h b/cache.h
index ac92421f3a..7434740c99 100644
--- a/cache.h
+++ b/cache.h
@@ -339,7 +339,8 @@ struct index_state {
        struct cache_time timestamp;
        unsigned name_hash_initialized : 1,
                 initialized : 1,
-                drop_cache_tree : 1;
+                drop_cache_tree : 1,
+                fsmonitor_has_run_once : 1;
        struct hashmap name_hash;
        struct hashmap dir_hash;
        struct object_id oid;
diff --git a/fsmonitor.c b/fsmonitor.c
index 665bd2d425..1dee0aded1 100644
--- a/fsmonitor.c
+++ b/fsmonitor.c
@@ -129,7 +129,6 @@ static void fsmonitor_refresh_callback(struct index_state 
*istate, const char *n
 
 void refresh_fsmonitor(struct index_state *istate)
 {
-       static int has_run_once = 0;
        struct strbuf query_result = STRBUF_INIT;
        int query_success = 0;
        size_t bol; /* beginning of line */
@@ -137,9 +136,9 @@ void refresh_fsmonitor(struct index_state *istate)
        char *buf;
        int i;
 
-       if (!core_fsmonitor || has_run_once)
+       if (!core_fsmonitor || istate->fsmonitor_has_run_once)
                return;
-       has_run_once = 1;
+       istate->fsmonitor_has_run_once = 1;
 
        trace_printf_key(&trace_fsmonitor, "refresh fsmonitor");
        /*
diff --git a/read-cache.c b/read-cache.c
index 4dc6de1b55..0bf39e177a 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2335,6 +2335,7 @@ int discard_index(struct index_state *istate)
        free_name_hash(istate);
        cache_tree_free(&(istate->cache_tree));
        istate->initialized = 0;
+       istate->fsmonitor_has_run_once = 0;
        FREE_AND_NULL(istate->cache);
        istate->cache_alloc = 0;
        discard_split_index(istate);
diff --git a/t/t7519-status-fsmonitor.sh b/t/t7519-status-fsmonitor.sh
index afd8fa7532..81a375fa0f 100755
--- a/t/t7519-status-fsmonitor.sh
+++ b/t/t7519-status-fsmonitor.sh
@@ -346,7 +346,7 @@ test_expect_success UNTRACKED_CACHE 'ignore .git changes 
when invalidating UNTR'
        test_cmp before after
 '
 
-test_expect_failure 'discard_index() also discards fsmonitor info' '
+test_expect_success 'discard_index() also discards fsmonitor info' '
        test_config core.fsmonitor "$TEST_DIRECTORY/t7519/fsmonitor-all" &&
        test_might_fail git update-index --refresh &&
        test-tool read-cache --print-and-refresh=tracked 2 >actual &&
-- 
gitgitgadget

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