revert(3p/git): Revert merge of git upstream at v2.26.2 r/852

This causes cgit to serve error pages, which is undesirable.

This reverts commit 5229c9b232de5bfa959ad6ebbb4c8192ac513352, reversing
changes made to f2b211131f2347342dde63975b09cf603149f1a3.

1 files changed, 37 insertions, 137 deletions

diff --git a/third_party/git/fsmonitor.c b/third_party/git/fsmonitor.c
index 932bd9012daf..231e83a94db5 100644
--- a/third_party/git/fsmonitor.c
+++ b/third_party/git/fsmonitor.c
@@ -6,42 +6,19 @@
 #include "run-command.h"
 #include "strbuf.h"
 
-#define INDEX_EXTENSION_VERSION1	(1)
-#define INDEX_EXTENSION_VERSION2	(2)
-#define HOOK_INTERFACE_VERSION1		(1)
-#define HOOK_INTERFACE_VERSION2		(2)
+#define INDEX_EXTENSION_VERSION	(1)
+#define HOOK_INTERFACE_VERSION	(1)
 
 struct trace_key trace_fsmonitor = TRACE_KEY_INIT(FSMONITOR);
 
 static void fsmonitor_ewah_callback(size_t pos, void *is)
 {
 	struct index_state *istate = (struct index_state *)is;
-	struct cache_entry *ce;
+	struct cache_entry *ce = istate->cache[pos];
 
-	if (pos >= istate->cache_nr)
-		BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" >= %u)",
-		    (uintmax_t)pos, istate->cache_nr);
-
-	ce = istate->cache[pos];
 	ce->ce_flags &= ~CE_FSMONITOR_VALID;
 }
 
-static int fsmonitor_hook_version(void)
-{
-	int hook_version;
-
-	if (git_config_get_int("core.fsmonitorhookversion", &hook_version))
-		return -1;
-
-	if (hook_version == HOOK_INTERFACE_VERSION1 ||
-	    hook_version == HOOK_INTERFACE_VERSION2)
-		return hook_version;
-
-	warning("Invalid hook version '%i' in core.fsmonitorhookversion. "
-		"Must be 1 or 2.", hook_version);
-	return -1;
-}
-
 int read_fsmonitor_extension(struct index_state *istate, const void *data,
 	unsigned long sz)
 {
@@ -50,26 +27,17 @@ int read_fsmonitor_extension(struct index_state *istate, const void *data,
 	uint32_t ewah_size;
 	struct ewah_bitmap *fsmonitor_dirty;
 	int ret;
-	uint64_t timestamp;
-	struct strbuf last_update = STRBUF_INIT;
 
-	if (sz < sizeof(uint32_t) + 1 + sizeof(uint32_t))
+	if (sz < sizeof(uint32_t) + sizeof(uint64_t) + sizeof(uint32_t))
 		return error("corrupt fsmonitor extension (too short)");
 
 	hdr_version = get_be32(index);
 	index += sizeof(uint32_t);
-	if (hdr_version == INDEX_EXTENSION_VERSION1) {
-		timestamp = get_be64(index);
-		strbuf_addf(&last_update, "%"PRIu64"", timestamp);
-		index += sizeof(uint64_t);
-	} else if (hdr_version == INDEX_EXTENSION_VERSION2) {
-		strbuf_addstr(&last_update, index);
-		index += last_update.len + 1;
-	} else {
+	if (hdr_version != INDEX_EXTENSION_VERSION)
 		return error("bad fsmonitor version %d", hdr_version);
-	}
 
-	istate->fsmonitor_last_update = strbuf_detach(&last_update, NULL);
+	istate->fsmonitor_last_update = get_be64(index);
+	index += sizeof(uint64_t);
 
 	ewah_size = get_be32(index);
 	index += sizeof(uint32_t);
@@ -82,45 +50,32 @@ int read_fsmonitor_extension(struct index_state *istate, const void *data,
 	}
 	istate->fsmonitor_dirty = fsmonitor_dirty;
 
-	if (!istate->split_index &&
-	    istate->fsmonitor_dirty->bit_size > istate->cache_nr)
-		BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)",
-		    (uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr);
-
 	trace_printf_key(&trace_fsmonitor, "read fsmonitor extension successful");
 	return 0;
 }
 
 void fill_fsmonitor_bitmap(struct index_state *istate)
 {
-	unsigned int i, skipped = 0;
+	unsigned int i;
 	istate->fsmonitor_dirty = ewah_new();
-	for (i = 0; i < istate->cache_nr; i++) {
-		if (istate->cache[i]->ce_flags & CE_REMOVE)
-			skipped++;
-		else if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID))
-			ewah_set(istate->fsmonitor_dirty, i - skipped);
-	}
+	for (i = 0; i < istate->cache_nr; i++)
+		if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID))
+			ewah_set(istate->fsmonitor_dirty, i);
 }
 
 void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate)
 {
 	uint32_t hdr_version;
+	uint64_t tm;
 	uint32_t ewah_start;
 	uint32_t ewah_size = 0;
 	int fixup = 0;
 
-	if (!istate->split_index &&
-	    istate->fsmonitor_dirty->bit_size > istate->cache_nr)
-		BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)",
-		    (uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr);
-
-	put_be32(&hdr_version, INDEX_EXTENSION_VERSION2);
+	put_be32(&hdr_version, INDEX_EXTENSION_VERSION);
 	strbuf_add(sb, &hdr_version, sizeof(uint32_t));
 
-	strbuf_addstr(sb, istate->fsmonitor_last_update);
-	strbuf_addch(sb, 0); /* Want to keep a NUL */
-
+	put_be64(&tm, istate->fsmonitor_last_update);
+	strbuf_add(sb, &tm, sizeof(uint64_t));
 	fixup = sb->len;
 	strbuf_add(sb, &ewah_size, sizeof(uint32_t)); /* we'll fix this up later */
 
@@ -137,9 +92,9 @@ void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate)
 }
 
 /*
- * Call the query-fsmonitor hook passing the last update token of the saved results.
+ * Call the query-fsmonitor hook passing the time of the last saved results.
  */
-static int query_fsmonitor(int version, const char *last_update, struct strbuf *query_result)
+static int query_fsmonitor(int version, uint64_t last_update, struct strbuf *query_result)
 {
 	struct child_process cp = CHILD_PROCESS_INIT;
 
@@ -148,7 +103,7 @@ static int query_fsmonitor(int version, const char *last_update, struct strbuf *
 
 	argv_array_push(&cp.args, core_fsmonitor);
 	argv_array_pushf(&cp.args, "%d", version);
-	argv_array_pushf(&cp.args, "%s", last_update);
+	argv_array_pushf(&cp.args, "%" PRIuMAX, (uintmax_t)last_update);
 	cp.use_shell = 1;
 	cp.dir = get_git_work_tree();
 
@@ -175,18 +130,14 @@ static void fsmonitor_refresh_callback(struct index_state *istate, const char *n
 void refresh_fsmonitor(struct index_state *istate)
 {
 	struct strbuf query_result = STRBUF_INIT;
-	int query_success = 0, hook_version = -1;
-	size_t bol = 0; /* beginning of line */
+	int query_success = 0;
+	size_t bol; /* beginning of line */
 	uint64_t last_update;
-	struct strbuf last_update_token = STRBUF_INIT;
 	char *buf;
 	unsigned int i;
 
 	if (!core_fsmonitor || istate->fsmonitor_has_run_once)
 		return;
-
-	hook_version = fsmonitor_hook_version();
-
 	istate->fsmonitor_has_run_once = 1;
 
 	trace_printf_key(&trace_fsmonitor, "refresh fsmonitor");
@@ -195,60 +146,26 @@ void refresh_fsmonitor(struct index_state *istate)
 	 * should be inclusive to ensure we don't miss potential changes.
 	 */
 	last_update = getnanotime();
-	if (hook_version == HOOK_INTERFACE_VERSION1)
-		strbuf_addf(&last_update_token, "%"PRIu64"", last_update);
 
 	/*
-	 * If we have a last update token, call query_fsmonitor for the set of
-	 * changes since that token, else assume everything is possibly dirty
+	 * If we have a last update time, call query_fsmonitor for the set of
+	 * changes since that time, else assume everything is possibly dirty
 	 * and check it all.
 	 */
 	if (istate->fsmonitor_last_update) {
-		if (hook_version == -1 || hook_version == HOOK_INTERFACE_VERSION2) {
-			query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION2,
-				istate->fsmonitor_last_update, &query_result);
-
-			if (query_success) {
-				if (hook_version < 0)
-					hook_version = HOOK_INTERFACE_VERSION2;
-
-				/*
-				 * First entry will be the last update token
-				 * Need to use a char * variable because static
-				 * analysis was suggesting to use strbuf_addbuf
-				 * but we don't want to copy the entire strbuf
-				 * only the the chars up to the first NUL
-				 */
-				buf = query_result.buf;
-				strbuf_addstr(&last_update_token, buf);
-				if (!last_update_token.len) {
-					warning("Empty last update token.");
-					query_success = 0;
-				} else {
-					bol = last_update_token.len + 1;
-				}
-			} else if (hook_version < 0) {
-				hook_version = HOOK_INTERFACE_VERSION1;
-				if (!last_update_token.len)
-					strbuf_addf(&last_update_token, "%"PRIu64"", last_update);
-			}
-		}
-
-		if (hook_version == HOOK_INTERFACE_VERSION1) {
-			query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION1,
-				istate->fsmonitor_last_update, &query_result);
-		}
-
+		query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION,
+			istate->fsmonitor_last_update, &query_result);
 		trace_performance_since(last_update, "fsmonitor process '%s'", core_fsmonitor);
 		trace_printf_key(&trace_fsmonitor, "fsmonitor process '%s' returned %s",
 			core_fsmonitor, query_success ? "success" : "failure");
 	}
 
 	/* a fsmonitor process can return '/' to indicate all entries are invalid */
-	if (query_success && query_result.buf[bol] != '/') {
+	if (query_success && query_result.buf[0] != '/') {
 		/* Mark all entries returned by the monitor as dirty */
 		buf = query_result.buf;
-		for (i = bol; i < query_result.len; i++) {
+		bol = 0;
+		for (i = 0; i < query_result.len; i++) {
 			if (buf[i] != '\0')
 				continue;
 			fsmonitor_refresh_callback(istate, buf + bol);
@@ -256,47 +173,31 @@ void refresh_fsmonitor(struct index_state *istate)
 		}
 		if (bol < query_result.len)
 			fsmonitor_refresh_callback(istate, buf + bol);
-
-		/* Now mark the untracked cache for fsmonitor usage */
-		if (istate->untracked)
-			istate->untracked->use_fsmonitor = 1;
 	} else {
-
-		/* We only want to run the post index changed hook if we've actually changed entries, so keep track
-		 * if we actually changed entries or not */
-		int is_cache_changed = 0;
 		/* Mark all entries invalid */
-		for (i = 0; i < istate->cache_nr; i++) {
-			if (istate->cache[i]->ce_flags & CE_FSMONITOR_VALID) {
-				is_cache_changed = 1;
-				istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
-			}
-		}
+		for (i = 0; i < istate->cache_nr; i++)
+			istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
 
 		/* If we're going to check every file, ensure we save the results */
-		if (is_cache_changed)
-			istate->cache_changed |= FSMONITOR_CHANGED;
+		istate->cache_changed |= FSMONITOR_CHANGED;
 
 		if (istate->untracked)
 			istate->untracked->use_fsmonitor = 0;
 	}
 	strbuf_release(&query_result);
 
-	/* Now that we've updated istate, save the last_update_token */
-	FREE_AND_NULL(istate->fsmonitor_last_update);
-	istate->fsmonitor_last_update = strbuf_detach(&last_update_token, NULL);
+	/* Now that we've updated istate, save the last_update time */
+	istate->fsmonitor_last_update = last_update;
 }
 
 void add_fsmonitor(struct index_state *istate)
 {
 	unsigned int i;
-	struct strbuf last_update = STRBUF_INIT;
 
 	if (!istate->fsmonitor_last_update) {
 		trace_printf_key(&trace_fsmonitor, "add fsmonitor");
 		istate->cache_changed |= FSMONITOR_CHANGED;
-		strbuf_addf(&last_update, "%"PRIu64"", getnanotime());
-		istate->fsmonitor_last_update = strbuf_detach(&last_update, NULL);
+		istate->fsmonitor_last_update = getnanotime();
 
 		/* reset the fsmonitor state */
 		for (i = 0; i < istate->cache_nr; i++)
@@ -318,7 +219,7 @@ void remove_fsmonitor(struct index_state *istate)
 	if (istate->fsmonitor_last_update) {
 		trace_printf_key(&trace_fsmonitor, "remove fsmonitor");
 		istate->cache_changed |= FSMONITOR_CHANGED;
-		FREE_AND_NULL(istate->fsmonitor_last_update);
+		istate->fsmonitor_last_update = 0;
 	}
 }
 
@@ -335,12 +236,11 @@ void tweak_fsmonitor(struct index_state *istate)
 			}
 
 			/* Mark all previously saved entries as dirty */
-			if (istate->fsmonitor_dirty->bit_size > istate->cache_nr)
-				BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)",
-				    (uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr);
 			ewah_each_bit(istate->fsmonitor_dirty, fsmonitor_ewah_callback, istate);
 
-			refresh_fsmonitor(istate);
+			/* Now mark the untracked cache for fsmonitor usage */
+			if (istate->untracked)
+				istate->untracked->use_fsmonitor = 1;
 		}
 
 		ewah_free(istate->fsmonitor_dirty);