log_write_email_headers: use strbufs
[git/git.git] / fsmonitor.c
CommitLineData
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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
12struct trace_key trace_fsmonitor = TRACE_KEY_INIT(FSMONITOR);
13
14static 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
22int 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;
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29 int ret;
30
31 if (sz < sizeof(uint32_t) + sizeof(uint64_t) + sizeof(uint32_t))
32 return error("corrupt fsmonitor extension (too short)");
33
34 hdr_version = get_be32(index);
35 index += sizeof(uint32_t);
36 if (hdr_version != INDEX_EXTENSION_VERSION)
37 return error("bad fsmonitor version %d", hdr_version);
38
39 istate->fsmonitor_last_update = get_be64(index);
40 index += sizeof(uint64_t);
41
42 ewah_size = get_be32(index);
43 index += sizeof(uint32_t);
44
45 fsmonitor_dirty = ewah_new();
46 ret = ewah_read_mmap(fsmonitor_dirty, index, ewah_size);
47 if (ret != ewah_size) {
48 ewah_free(fsmonitor_dirty);
49 return error("failed to parse ewah bitmap reading fsmonitor index extension");
50 }
ba1b9cac 51 istate->fsmonitor_dirty = fsmonitor_dirty;
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52
53 trace_printf_key(&trace_fsmonitor, "read fsmonitor extension successful");
54 return 0;
55}
56
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57void fill_fsmonitor_bitmap(struct index_state *istate)
58{
59 int i;
60 istate->fsmonitor_dirty = ewah_new();
61 for (i = 0; i < istate->cache_nr; i++)
62 if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID))
63 ewah_set(istate->fsmonitor_dirty, i);
64}
65
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66void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate)
67{
68 uint32_t hdr_version;
69 uint64_t tm;
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70 uint32_t ewah_start;
71 uint32_t ewah_size = 0;
72 int fixup = 0;
73
74 put_be32(&hdr_version, INDEX_EXTENSION_VERSION);
75 strbuf_add(sb, &hdr_version, sizeof(uint32_t));
76
77 put_be64(&tm, istate->fsmonitor_last_update);
78 strbuf_add(sb, &tm, sizeof(uint64_t));
79 fixup = sb->len;
80 strbuf_add(sb, &ewah_size, sizeof(uint32_t)); /* we'll fix this up later */
81
82 ewah_start = sb->len;
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83 ewah_serialize_strbuf(istate->fsmonitor_dirty, sb);
84 ewah_free(istate->fsmonitor_dirty);
85 istate->fsmonitor_dirty = NULL;
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86
87 /* fix up size field */
88 put_be32(&ewah_size, sb->len - ewah_start);
89 memcpy(sb->buf + fixup, &ewah_size, sizeof(uint32_t));
90
91 trace_printf_key(&trace_fsmonitor, "write fsmonitor extension successful");
92}
93
94/*
95 * Call the query-fsmonitor hook passing the time of the last saved results.
96 */
97static int query_fsmonitor(int version, uint64_t last_update, struct strbuf *query_result)
98{
99 struct child_process cp = CHILD_PROCESS_INIT;
100 char ver[64];
101 char date[64];
102 const char *argv[4];
103
104 if (!(argv[0] = core_fsmonitor))
105 return -1;
106
107 snprintf(ver, sizeof(version), "%d", version);
108 snprintf(date, sizeof(date), "%" PRIuMAX, (uintmax_t)last_update);
109 argv[1] = ver;
110 argv[2] = date;
111 argv[3] = NULL;
112 cp.argv = argv;
113 cp.use_shell = 1;
11cf33be 114 cp.dir = get_git_work_tree();
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115
116 return capture_command(&cp, query_result, 1024);
117}
118
119static void fsmonitor_refresh_callback(struct index_state *istate, const char *name)
120{
121 int pos = index_name_pos(istate, name, strlen(name));
122
123 if (pos >= 0) {
124 struct cache_entry *ce = istate->cache[pos];
125 ce->ce_flags &= ~CE_FSMONITOR_VALID;
126 }
127
128 /*
129 * Mark the untracked cache dirty even if it wasn't found in the index
130 * as it could be a new untracked file.
131 */
132 trace_printf_key(&trace_fsmonitor, "fsmonitor_refresh_callback '%s'", name);
0cacebf0 133 untracked_cache_invalidate_path(istate, name, 0);
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134}
135
136void refresh_fsmonitor(struct index_state *istate)
137{
138 static int has_run_once = 0;
139 struct strbuf query_result = STRBUF_INIT;
140 int query_success = 0;
141 size_t bol; /* beginning of line */
142 uint64_t last_update;
143 char *buf;
144 int i;
145
146 if (!core_fsmonitor || has_run_once)
147 return;
148 has_run_once = 1;
149
150 trace_printf_key(&trace_fsmonitor, "refresh fsmonitor");
151 /*
152 * This could be racy so save the date/time now and query_fsmonitor
153 * should be inclusive to ensure we don't miss potential changes.
154 */
155 last_update = getnanotime();
156
157 /*
158 * If we have a last update time, call query_fsmonitor for the set of
159 * changes since that time, else assume everything is possibly dirty
160 * and check it all.
161 */
162 if (istate->fsmonitor_last_update) {
163 query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION,
164 istate->fsmonitor_last_update, &query_result);
165 trace_performance_since(last_update, "fsmonitor process '%s'", core_fsmonitor);
166 trace_printf_key(&trace_fsmonitor, "fsmonitor process '%s' returned %s",
167 core_fsmonitor, query_success ? "success" : "failure");
168 }
169
170 /* a fsmonitor process can return '/' to indicate all entries are invalid */
171 if (query_success && query_result.buf[0] != '/') {
172 /* Mark all entries returned by the monitor as dirty */
173 buf = query_result.buf;
174 bol = 0;
175 for (i = 0; i < query_result.len; i++) {
176 if (buf[i] != '\0')
177 continue;
178 fsmonitor_refresh_callback(istate, buf + bol);
179 bol = i + 1;
180 }
181 if (bol < query_result.len)
182 fsmonitor_refresh_callback(istate, buf + bol);
183 } else {
184 /* Mark all entries invalid */
185 for (i = 0; i < istate->cache_nr; i++)
186 istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
187
188 if (istate->untracked)
189 istate->untracked->use_fsmonitor = 0;
190 }
191 strbuf_release(&query_result);
192
193 /* Now that we've updated istate, save the last_update time */
194 istate->fsmonitor_last_update = last_update;
195}
196
197void add_fsmonitor(struct index_state *istate)
198{
199 int i;
200
201 if (!istate->fsmonitor_last_update) {
202 trace_printf_key(&trace_fsmonitor, "add fsmonitor");
203 istate->cache_changed |= FSMONITOR_CHANGED;
204 istate->fsmonitor_last_update = getnanotime();
205
206 /* reset the fsmonitor state */
207 for (i = 0; i < istate->cache_nr; i++)
208 istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
209
210 /* reset the untracked cache */
211 if (istate->untracked) {
212 add_untracked_cache(istate);
213 istate->untracked->use_fsmonitor = 1;
214 }
215
216 /* Update the fsmonitor state */
217 refresh_fsmonitor(istate);
218 }
219}
220
221void remove_fsmonitor(struct index_state *istate)
222{
223 if (istate->fsmonitor_last_update) {
224 trace_printf_key(&trace_fsmonitor, "remove fsmonitor");
225 istate->cache_changed |= FSMONITOR_CHANGED;
226 istate->fsmonitor_last_update = 0;
227 }
228}
229
230void tweak_fsmonitor(struct index_state *istate)
231{
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232 int i;
233 int fsmonitor_enabled = git_config_get_fsmonitor();
234
235 if (istate->fsmonitor_dirty) {
236 if (fsmonitor_enabled) {
237 /* Mark all entries valid */
238 for (i = 0; i < istate->cache_nr; i++) {
239 istate->cache[i]->ce_flags |= CE_FSMONITOR_VALID;
240 }
241
242 /* Mark all previously saved entries as dirty */
243 ewah_each_bit(istate->fsmonitor_dirty, fsmonitor_ewah_callback, istate);
244
245 /* Now mark the untracked cache for fsmonitor usage */
246 if (istate->untracked)
247 istate->untracked->use_fsmonitor = 1;
248 }
249
250 ewah_free(istate->fsmonitor_dirty);
251 istate->fsmonitor_dirty = NULL;
252 }
253
254 switch (fsmonitor_enabled) {
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255 case -1: /* keep: do nothing */
256 break;
257 case 0: /* false */
258 remove_fsmonitor(istate);
259 break;
260 case 1: /* true */
261 add_fsmonitor(istate);
262 break;
263 default: /* unknown value: do nothing */
264 break;
265 }
266}