1/*
2 * Licensed under a two-clause BSD-style license.
3 * See LICENSE for details.
4 */
5
6#include "git-compat-util.h"
7#include "fast_export.h"
8#include "line_buffer.h"
9#include "repo_tree.h"
10#include "string_pool.h"
11#include "strbuf.h"
12
13#define MAX_GITSVN_LINE_LEN 4096
14
15static uint32_t first_commit_done;
16static struct line_buffer report_buffer = LINE_BUFFER_INIT;
17
18void fast_export_init(int fd)
19{
20 if (buffer_fdinit(&report_buffer, fd))
21 die_errno("cannot read from file descriptor %d", fd);
22}
23
24void fast_export_deinit(void)
25{
26 if (buffer_deinit(&report_buffer))
27 die_errno("error closing fast-import feedback stream");
28}
29
30void fast_export_reset(void)
31{
32 buffer_reset(&report_buffer);
33}
34
35void fast_export_delete(uint32_t depth, const uint32_t *path)
36{
37 printf("D \"");
38 pool_print_seq_q(depth, path, '/', stdout);
39 printf("\"\n");
40}
41
42static void fast_export_truncate(uint32_t depth, const uint32_t *path, uint32_t mode)
43{
44 fast_export_modify(depth, path, mode, "inline");
45 printf("data 0\n\n");
46}
47
48void fast_export_modify(uint32_t depth, const uint32_t *path, uint32_t mode,
49 const char *dataref)
50{
51 /* Mode must be 100644, 100755, 120000, or 160000. */
52 if (!dataref) {
53 fast_export_truncate(depth, path, mode);
54 return;
55 }
56 printf("M %06"PRIo32" %s \"", mode, dataref);
57 pool_print_seq_q(depth, path, '/', stdout);
58 printf("\"\n");
59}
60
61static char gitsvnline[MAX_GITSVN_LINE_LEN];
62void fast_export_begin_commit(uint32_t revision, uint32_t author, char *log,
63 uint32_t uuid, uint32_t url,
64 unsigned long timestamp)
65{
66 if (!log)
67 log = "";
68 if (~uuid && ~url) {
69 snprintf(gitsvnline, MAX_GITSVN_LINE_LEN,
70 "\n\ngit-svn-id: %s@%"PRIu32" %s\n",
71 pool_fetch(url), revision, pool_fetch(uuid));
72 } else {
73 *gitsvnline = '\0';
74 }
75 printf("commit refs/heads/master\n");
76 printf("mark :%"PRIu32"\n", revision);
77 printf("committer %s <%s@%s> %ld +0000\n",
78 ~author ? pool_fetch(author) : "nobody",
79 ~author ? pool_fetch(author) : "nobody",
80 ~uuid ? pool_fetch(uuid) : "local", timestamp);
81 printf("data %"PRIu32"\n%s%s\n",
82 (uint32_t) (strlen(log) + strlen(gitsvnline)),
83 log, gitsvnline);
84 if (!first_commit_done) {
85 if (revision > 1)
86 printf("from refs/heads/master^0\n");
87 first_commit_done = 1;
88 }
89}
90
91void fast_export_end_commit(uint32_t revision)
92{
93 printf("progress Imported commit %"PRIu32".\n\n", revision);
94}
95
96static void ls_from_rev(uint32_t rev, uint32_t depth, const uint32_t *path)
97{
98 /* ls :5 path/to/old/file */
99 printf("ls :%"PRIu32" \"", rev);
100 pool_print_seq_q(depth, path, '/', stdout);
101 printf("\"\n");
102 fflush(stdout);
103}
104
105static void ls_from_active_commit(uint32_t depth, const uint32_t *path)
106{
107 /* ls "path/to/file" */
108 printf("ls \"");
109 pool_print_seq_q(depth, path, '/', stdout);
110 printf("\"\n");
111 fflush(stdout);
112}
113
114static const char *get_response_line(void)
115{
116 const char *line = buffer_read_line(&report_buffer);
117 if (line)
118 return line;
119 if (buffer_ferror(&report_buffer))
120 die_errno("error reading from fast-import");
121 die("unexpected end of fast-import feedback");
122}
123
124void fast_export_data(uint32_t mode, uint32_t len, struct line_buffer *input)
125{
126 if (mode == REPO_MODE_LNK) {
127 /* svn symlink blobs start with "link " */
128 buffer_skip_bytes(input, 5);
129 len -= 5;
130 }
131 printf("data %"PRIu32"\n", len);
132 buffer_copy_bytes(input, len);
133 fputc('\n', stdout);
134}
135
136static int parse_ls_response(const char *response, uint32_t *mode,
137 struct strbuf *dataref)
138{
139 const char *tab;
140 const char *response_end;
141
142 assert(response);
143 response_end = response + strlen(response);
144
145 if (*response == 'm') { /* Missing. */
146 errno = ENOENT;
147 return -1;
148 }
149
150 /* Mode. */
151 if (response_end - response < strlen("100644") ||
152 response[strlen("100644")] != ' ')
153 die("invalid ls response: missing mode: %s", response);
154 *mode = 0;
155 for (; *response != ' '; response++) {
156 char ch = *response;
157 if (ch < '0' || ch > '7')
158 die("invalid ls response: mode is not octal: %s", response);
159 *mode *= 8;
160 *mode += ch - '0';
161 }
162
163 /* ' blob ' or ' tree ' */
164 if (response_end - response < strlen(" blob ") ||
165 (response[1] != 'b' && response[1] != 't'))
166 die("unexpected ls response: not a tree or blob: %s", response);
167 response += strlen(" blob ");
168
169 /* Dataref. */
170 tab = memchr(response, '\t', response_end - response);
171 if (!tab)
172 die("invalid ls response: missing tab: %s", response);
173 strbuf_add(dataref, response, tab - response);
174 return 0;
175}
176
177int fast_export_ls_rev(uint32_t rev, uint32_t depth, const uint32_t *path,
178 uint32_t *mode, struct strbuf *dataref)
179{
180 ls_from_rev(rev, depth, path);
181 return parse_ls_response(get_response_line(), mode, dataref);
182}
183
184int fast_export_ls(uint32_t depth, const uint32_t *path,
185 uint32_t *mode, struct strbuf *dataref)
186{
187 ls_from_active_commit(depth, path);
188 return parse_ls_response(get_response_line(), mode, dataref);
189}