[thirdparty/git.git] / fsmonitor.c

#include "cache.h"
#include "config.h"
#include "dir.h"
#include "ewah/ewok.h"
#include "fsmonitor.h"
#include "run-command.h"
#include "strbuf.h"

#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 = istate->cache[pos];

	ce->ce_flags &= ~CE_FSMONITOR_VALID;
}

int read_fsmonitor_extension(struct index_state *istate, const void *data,
	unsigned long sz)
{
	const char *index = data;
	uint32_t hdr_version;
	uint32_t ewah_size;
	struct ewah_bitmap *fsmonitor_dirty;
	int i;
	int ret;

	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_VERSION)
		return error("bad fsmonitor version %d", hdr_version);

	istate->fsmonitor_last_update = get_be64(index);
	index += sizeof(uint64_t);

	ewah_size = get_be32(index);
	index += sizeof(uint32_t);

	fsmonitor_dirty = ewah_new();
	ret = ewah_read_mmap(fsmonitor_dirty, index, ewah_size);
	if (ret != ewah_size) {
		ewah_free(fsmonitor_dirty);
		return error("failed to parse ewah bitmap reading fsmonitor index extension");
	}

	if (git_config_get_fsmonitor()) {
		/* Mark all entries valid */
		for (i = 0; i < istate->cache_nr; i++)
			istate->cache[i]->ce_flags |= CE_FSMONITOR_VALID;

		/* Mark all previously saved entries as dirty */
		ewah_each_bit(fsmonitor_dirty, fsmonitor_ewah_callback, istate);

		/* Now mark the untracked cache for fsmonitor usage */
		if (istate->untracked)
			istate->untracked->use_fsmonitor = 1;
	}
	ewah_free(fsmonitor_dirty);

	trace_printf_key(&trace_fsmonitor, "read fsmonitor extension successful");
	return 0;
}

void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate)
{
	uint32_t hdr_version;
	uint64_t tm;
	struct ewah_bitmap *bitmap;
	int i;
	uint32_t ewah_start;
	uint32_t ewah_size = 0;
	int fixup = 0;

	put_be32(&hdr_version, INDEX_EXTENSION_VERSION);
	strbuf_add(sb, &hdr_version, sizeof(uint32_t));

	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 */

	ewah_start = sb->len;
	bitmap = ewah_new();
	for (i = 0; i < istate->cache_nr; i++)
		if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID))
			ewah_set(bitmap, i);
	ewah_serialize_strbuf(bitmap, sb);
	ewah_free(bitmap);

	/* fix up size field */
	put_be32(&ewah_size, sb->len - ewah_start);
	memcpy(sb->buf + fixup, &ewah_size, sizeof(uint32_t));

	trace_printf_key(&trace_fsmonitor, "write fsmonitor extension successful");
}

/*
 * Call the query-fsmonitor hook passing the time of the last saved results.
 */
static int query_fsmonitor(int version, uint64_t last_update, struct strbuf *query_result)
{
	struct child_process cp = CHILD_PROCESS_INIT;
	char ver[64];
	char date[64];
	const char *argv[4];

	if (!(argv[0] = core_fsmonitor))
		return -1;

	snprintf(ver, sizeof(version), "%d", version);
	snprintf(date, sizeof(date), "%" PRIuMAX, (uintmax_t)last_update);
	argv[1] = ver;
	argv[2] = date;
	argv[3] = NULL;
	cp.argv = argv;
	cp.use_shell = 1;

	return capture_command(&cp, query_result, 1024);
}

static void fsmonitor_refresh_callback(struct index_state *istate, const char *name)
{
	int pos = index_name_pos(istate, name, strlen(name));

	if (pos >= 0) {
		struct cache_entry *ce = istate->cache[pos];
		ce->ce_flags &= ~CE_FSMONITOR_VALID;
	}

	/*
	 * Mark the untracked cache dirty even if it wasn't found in the index
	 * as it could be a new untracked file.
	 */
	trace_printf_key(&trace_fsmonitor, "fsmonitor_refresh_callback '%s'", name);
	untracked_cache_invalidate_path(istate, name);
}

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 */
	uint64_t last_update;
	char *buf;
	int i;

	if (!core_fsmonitor || has_run_once)
		return;
	has_run_once = 1;

	trace_printf_key(&trace_fsmonitor, "refresh fsmonitor");
	/*
	 * This could be racy so save the date/time now and query_fsmonitor
	 * should be inclusive to ensure we don't miss potential changes.
	 */
	last_update = getnanotime();

	/*
	 * 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) {
		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[0] != '/') {
		/* Mark all entries returned by the monitor as dirty */
		buf = query_result.buf;
		bol = 0;
		for (i = 0; i < query_result.len; i++) {
			if (buf[i] != '\0')
				continue;
			fsmonitor_refresh_callback(istate, buf + bol);
			bol = i + 1;
		}
		if (bol < query_result.len)
			fsmonitor_refresh_callback(istate, buf + bol);
	} else {
		/* Mark all entries invalid */
		for (i = 0; i < istate->cache_nr; i++)
			istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;

		if (istate->untracked)
			istate->untracked->use_fsmonitor = 0;
	}
	strbuf_release(&query_result);

	/* Now that we've updated istate, save the last_update time */
	istate->fsmonitor_last_update = last_update;
}

void add_fsmonitor(struct index_state *istate)
{
	int i;

	if (!istate->fsmonitor_last_update) {
		trace_printf_key(&trace_fsmonitor, "add fsmonitor");
		istate->cache_changed |= FSMONITOR_CHANGED;
		istate->fsmonitor_last_update = getnanotime();

		/* reset the fsmonitor state */
		for (i = 0; i < istate->cache_nr; i++)
			istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;

		/* reset the untracked cache */
		if (istate->untracked) {
			add_untracked_cache(istate);
			istate->untracked->use_fsmonitor = 1;
		}

		/* Update the fsmonitor state */
		refresh_fsmonitor(istate);
	}
}

void remove_fsmonitor(struct index_state *istate)
{
	if (istate->fsmonitor_last_update) {
		trace_printf_key(&trace_fsmonitor, "remove fsmonitor");
		istate->cache_changed |= FSMONITOR_CHANGED;
		istate->fsmonitor_last_update = 0;
	}
}

void tweak_fsmonitor(struct index_state *istate)
{
	switch (git_config_get_fsmonitor()) {
	case -1: /* keep: do nothing */
		break;
	case 0: /* false */
		remove_fsmonitor(istate);
		break;
	case 1: /* true */
		add_fsmonitor(istate);
		break;
	default: /* unknown value: do nothing */
		break;
	}
}
Commit	Line	Data
883e248b BP	1	#include "cache.h"
	2	#include "config.h"
	3	#include "dir.h"
	4	#include "ewah/ewok.h"
	5	#include "fsmonitor.h"
	6	#include "run-command.h"
	7	#include "strbuf.h"
	8
	9	#define INDEX_EXTENSION_VERSION (1)
	10	#define HOOK_INTERFACE_VERSION (1)
	11
	12	struct trace_key trace_fsmonitor = TRACE_KEY_INIT(FSMONITOR);
	13
	14	static void fsmonitor_ewah_callback(size_t pos, void *is)
	15	{
	16	struct index_state istate = (struct index_state )is;
	17	struct cache_entry *ce = istate->cache[pos];
	18
	19	ce->ce_flags &= ~CE_FSMONITOR_VALID;
	20	}
	21
	22	int read_fsmonitor_extension(struct index_state istate, const void data,
	23	unsigned long sz)
	24	{
	25	const char *index = data;
	26	uint32_t hdr_version;
	27	uint32_t ewah_size;
	28	struct ewah_bitmap *fsmonitor_dirty;
	29	int i;
	30	int ret;
	31
	32	if (sz < sizeof(uint32_t) + sizeof(uint64_t) + sizeof(uint32_t))
	33	return error("corrupt fsmonitor extension (too short)");
	34
	35	hdr_version = get_be32(index);
	36	index += sizeof(uint32_t);
	37	if (hdr_version != INDEX_EXTENSION_VERSION)
	38	return error("bad fsmonitor version %d", hdr_version);
	39
	40	istate->fsmonitor_last_update = get_be64(index);
	41	index += sizeof(uint64_t);
	42
	43	ewah_size = get_be32(index);
	44	index += sizeof(uint32_t);
	45
	46	fsmonitor_dirty = ewah_new();
	47	ret = ewah_read_mmap(fsmonitor_dirty, index, ewah_size);
	48	if (ret != ewah_size) {
	49	ewah_free(fsmonitor_dirty);
	50	return error("failed to parse ewah bitmap reading fsmonitor index extension");
	51	}
	52
	53	if (git_config_get_fsmonitor()) {
	54	/* Mark all entries valid */
	55	for (i = 0; i < istate->cache_nr; i++)
	56	istate->cache[i]->ce_flags \|= CE_FSMONITOR_VALID;
	57
	58	/* Mark all previously saved entries as dirty */
	59	ewah_each_bit(fsmonitor_dirty, fsmonitor_ewah_callback, istate);
	60
	61	/* Now mark the untracked cache for fsmonitor usage */
	62	if (istate->untracked)
	63	istate->untracked->use_fsmonitor = 1;
	64	}
65	ewah_free(fsmonitor_dirty);
66
67	trace_printf_key(&trace_fsmonitor, "read fsmonitor extension successful");
68	return 0;
69	}
70
71	void write_fsmonitor_extension(struct strbuf sb, struct index_state istate)
72	{
73	uint32_t hdr_version;
74	uint64_t tm;
75	struct ewah_bitmap *bitmap;
76	int i;
77	uint32_t ewah_start;
78	uint32_t ewah_size = 0;
79	int fixup = 0;
80
81	put_be32(&hdr_version, INDEX_EXTENSION_VERSION);
82	strbuf_add(sb, &hdr_version, sizeof(uint32_t));
83
84	put_be64(&tm, istate->fsmonitor_last_update);
85	strbuf_add(sb, &tm, sizeof(uint64_t));
86	fixup = sb->len;
87	strbuf_add(sb, &ewah_size, sizeof(uint32_t)); /* we'll fix this up later */
88
89	ewah_start = sb->len;
90	bitmap = ewah_new();
91	for (i = 0; i < istate->cache_nr; i++)
92	if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID))
93	ewah_set(bitmap, i);
94	ewah_serialize_strbuf(bitmap, sb);
95	ewah_free(bitmap);
96
97	/* fix up size field */
98	put_be32(&ewah_size, sb->len - ewah_start);
99	memcpy(sb->buf + fixup, &ewah_size, sizeof(uint32_t));
100
101	trace_printf_key(&trace_fsmonitor, "write fsmonitor extension successful");
102	}
103
104	/*
105	* Call the query-fsmonitor hook passing the time of the last saved results.
106	*/
107	static int query_fsmonitor(int version, uint64_t last_update, struct strbuf *query_result)
108	{
109	struct child_process cp = CHILD_PROCESS_INIT;
110	char ver[64];
111	char date[64];
112	const char *argv[4];
113
114	if (!(argv[0] = core_fsmonitor))
115	return -1;
116
117	snprintf(ver, sizeof(version), "%d", version);
118	snprintf(date, sizeof(date), "%" PRIuMAX, (uintmax_t)last_update);
119	argv[1] = ver;
120	argv[2] = date;
121	argv[3] = NULL;
122	cp.argv = argv;
123	cp.use_shell = 1;
124
125	return capture_command(&cp, query_result, 1024);
126	}
127
128	static void fsmonitor_refresh_callback(struct index_state istate, const char name)
129	{
130	int pos = index_name_pos(istate, name, strlen(name));
131
132	if (pos >= 0) {
133	struct cache_entry *ce = istate->cache[pos];
134	ce->ce_flags &= ~CE_FSMONITOR_VALID;
135	}
136
137	/*
138	* Mark the untracked cache dirty even if it wasn't found in the index
139	* as it could be a new untracked file.
140	*/
141	trace_printf_key(&trace_fsmonitor, "fsmonitor_refresh_callback '%s'", name);
142	untracked_cache_invalidate_path(istate, name);
143	}
144
145	void refresh_fsmonitor(struct index_state *istate)
146	{
147	static int has_run_once = 0;
148	struct strbuf query_result = STRBUF_INIT;
149	int query_success = 0;
150	size_t bol; /* beginning of line */
151	uint64_t last_update;
152	char *buf;
153	int i;
154
155	if (!core_fsmonitor \|\| has_run_once)
156	return;
157	has_run_once = 1;
158
159	trace_printf_key(&trace_fsmonitor, "refresh fsmonitor");
160	/*
161	* This could be racy so save the date/time now and query_fsmonitor
162	* should be inclusive to ensure we don't miss potential changes.
163	*/
164	last_update = getnanotime();
165
166	/*
167	* If we have a last update time, call query_fsmonitor for the set of
168	* changes since that time, else assume everything is possibly dirty
169	* and check it all.
170	*/
171	if (istate->fsmonitor_last_update) {
172	query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION,
173	istate->fsmonitor_last_update, &query_result);
174	trace_performance_since(last_update, "fsmonitor process '%s'", core_fsmonitor);
175	trace_printf_key(&trace_fsmonitor, "fsmonitor process '%s' returned %s",
176	core_fsmonitor, query_success ? "success" : "failure");
177	}
178
179	/* a fsmonitor process can return '/' to indicate all entries are invalid */
180	if (query_success && query_result.buf[0] != '/') {
181	/* Mark all entries returned by the monitor as dirty */
182	buf = query_result.buf;
183	bol = 0;
184	for (i = 0; i < query_result.len; i++) {
185	if (buf[i] != '\0')
186	continue;
187	fsmonitor_refresh_callback(istate, buf + bol);
188	bol = i + 1;
189	}
190	if (bol < query_result.len)
191	fsmonitor_refresh_callback(istate, buf + bol);
192	} else {
193	/* Mark all entries invalid */
194	for (i = 0; i < istate->cache_nr; i++)
195	istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
196
197	if (istate->untracked)
198	istate->untracked->use_fsmonitor = 0;
199	}
200	strbuf_release(&query_result);
201
202	/* Now that we've updated istate, save the last_update time */
203	istate->fsmonitor_last_update = last_update;
204	}
205
206	void add_fsmonitor(struct index_state *istate)
207	{
208	int i;
209
210	if (!istate->fsmonitor_last_update) {
211	trace_printf_key(&trace_fsmonitor, "add fsmonitor");
212	istate->cache_changed \|= FSMONITOR_CHANGED;
213	istate->fsmonitor_last_update = getnanotime();
214
215	/* reset the fsmonitor state */
216	for (i = 0; i < istate->cache_nr; i++)
217	istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
218
219	/* reset the untracked cache */
220	if (istate->untracked) {
221	add_untracked_cache(istate);
222	istate->untracked->use_fsmonitor = 1;
223	}
224
225	/* Update the fsmonitor state */
226	refresh_fsmonitor(istate);
227	}
228	}
229
230	void remove_fsmonitor(struct index_state *istate)
231	{
232	if (istate->fsmonitor_last_update) {
233	trace_printf_key(&trace_fsmonitor, "remove fsmonitor");
234	istate->cache_changed \|= FSMONITOR_CHANGED;
235	istate->fsmonitor_last_update = 0;
236	}
237	}
238
239	void tweak_fsmonitor(struct index_state *istate)
240	{
241	switch (git_config_get_fsmonitor()) {
242	case -1: /* keep: do nothing */
243	break;
244	case 0: /* false */
245	remove_fsmonitor(istate);
246	break;
247	case 1: /* true */
248	add_fsmonitor(istate);
249	break;
250	default: /* unknown value: do nothing */
251	break;
252	}
253	}