Split "git-pull-script" into two parts
[git/git.git] / local-pull.c
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include <fcntl.h>
5 #include <unistd.h>
6 #include <string.h>
7 #include <stdlib.h>
8 #include "cache.h"
9 #include "commit.h"
10 #include <errno.h>
11 #include <stdio.h>
12 #include "pull.h"
13
14 static int use_link = 0;
15 static int use_symlink = 0;
16 static int use_filecopy = 1;
17 static int verbose = 0;
18
19 static char *path;
20
21 static void say(const char *fmt, const char *hex) {
22 if (verbose)
23 fprintf(stderr, fmt, hex);
24 }
25
26 int fetch(unsigned char *sha1)
27 {
28 static int object_name_start = -1;
29 static char filename[PATH_MAX];
30 char *hex = sha1_to_hex(sha1);
31 const char *dest_filename = sha1_file_name(sha1);
32
33 if (object_name_start < 0) {
34 strcpy(filename, path); /* e.g. git.git */
35 strcat(filename, "/objects/");
36 object_name_start = strlen(filename);
37 }
38 filename[object_name_start+0] = hex[0];
39 filename[object_name_start+1] = hex[1];
40 filename[object_name_start+2] = '/';
41 strcpy(filename + object_name_start + 3, hex + 2);
42 if (use_link) {
43 if (!link(filename, dest_filename)) {
44 say("link %s\n", hex);
45 return 0;
46 }
47 /* If we got ENOENT there is no point continuing. */
48 if (errno == ENOENT) {
49 fprintf(stderr, "does not exist %s\n", filename);
50 return -1;
51 }
52 }
53 if (use_symlink && !symlink(filename, dest_filename)) {
54 say("symlink %s\n", hex);
55 return 0;
56 }
57 if (use_filecopy) {
58 int ifd, ofd, status;
59 struct stat st;
60 void *map;
61 ifd = open(filename, O_RDONLY);
62 if (ifd < 0 || fstat(ifd, &st) < 0) {
63 close(ifd);
64 fprintf(stderr, "cannot open %s\n", filename);
65 return -1;
66 }
67 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
68 close(ifd);
69 if (-1 == (int)(long)map) {
70 fprintf(stderr, "cannot mmap %s\n", filename);
71 return -1;
72 }
73 ofd = open(dest_filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
74 status = ((ofd < 0) ||
75 (write(ofd, map, st.st_size) != st.st_size));
76 munmap(map, st.st_size);
77 close(ofd);
78 if (status)
79 fprintf(stderr, "cannot write %s (%ld bytes)\n",
80 dest_filename, st.st_size);
81 else
82 say("copy %s\n", hex);
83 return status;
84 }
85 fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
86 return -1;
87 }
88
89 static const char *local_pull_usage =
90 "git-local-pull [-c] [-t] [-a] [-l] [-s] [-n] [-v] commit-id path";
91
92 /*
93 * By default we only use file copy.
94 * If -l is specified, a hard link is attempted.
95 * If -s is specified, then a symlink is attempted.
96 * If -n is _not_ specified, then a regular file-to-file copy is done.
97 */
98 int main(int argc, char **argv)
99 {
100 char *commit_id;
101 int arg = 1;
102
103 while (arg < argc && argv[arg][0] == '-') {
104 if (argv[arg][1] == 't')
105 get_tree = 1;
106 else if (argv[arg][1] == 'c')
107 get_history = 1;
108 else if (argv[arg][1] == 'a') {
109 get_all = 1;
110 get_tree = 1;
111 get_history = 1;
112 }
113 else if (argv[arg][1] == 'l')
114 use_link = 1;
115 else if (argv[arg][1] == 's')
116 use_symlink = 1;
117 else if (argv[arg][1] == 'n')
118 use_filecopy = 0;
119 else if (argv[arg][1] == 'v')
120 verbose = 1;
121 else
122 usage(local_pull_usage);
123 arg++;
124 }
125 if (argc < arg + 2)
126 usage(local_pull_usage);
127 commit_id = argv[arg];
128 path = argv[arg + 1];
129
130 if (pull(commit_id))
131 return 1;
132
133 return 0;
134 }