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