summaryrefslogtreecommitdiff
path: root/local-pull.c
blob: 908e18750903ddbec13f38ab8e1f389685ce9212 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/*
 * Copyright (C) 2005 Junio C Hamano
 */
#include "cache.h"
#include "commit.h"
#include "pull.h"
 
static int use_link = 0;
static int use_symlink = 0;
static int use_filecopy = 1;
 
static char *path; /* "Remote" git repository */
 
int fetch(unsigned char *sha1)
{
	static int object_name_start = -1;
	static char filename[PATH_MAX];
	char *hex = sha1_to_hex(sha1);
	const char *dest_filename = sha1_file_name(sha1);
 
	if (object_name_start < 0) {
		strcpy(filename, path); /* e.g. git.git */
		strcat(filename, "/objects/");
		object_name_start = strlen(filename);
	}
	filename[object_name_start+0] = hex[0];
	filename[object_name_start+1] = hex[1];
	filename[object_name_start+2] = '/';
	strcpy(filename + object_name_start + 3, hex + 2);
	if (use_link) {
		if (!link(filename, dest_filename)) {
			pull_say("link %s\n", hex);
			return 0;
		}
		/* If we got ENOENT there is no point continuing. */
		if (errno == ENOENT) {
			fprintf(stderr, "does not exist %s\n", filename);
			return -1;
		}
	}
	if (use_symlink && !symlink(filename, dest_filename)) {
		pull_say("symlink %s\n", hex);
		return 0;
	}
	if (use_filecopy) {
		int ifd, ofd, status;
		struct stat st;
		void *map;
		ifd = open(filename, O_RDONLY);
		if (ifd < 0 || fstat(ifd, &st) < 0) {
			close(ifd);
			fprintf(stderr, "cannot open %s\n", filename);
			return -1;
		}
		map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
		close(ifd);
		if (map == MAP_FAILED) {
			fprintf(stderr, "cannot mmap %s\n", filename);
			return -1;
		}
		ofd = open(dest_filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
		status = ((ofd < 0) ||
			  (write(ofd, map, st.st_size) != st.st_size));
		munmap(map, st.st_size);
		close(ofd);
		if (status)
			fprintf(stderr, "cannot write %s\n", dest_filename);
		else
			pull_say("copy %s\n", hex);
		return status;
	}
	fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
	return -1;
}
 
int fetch_ref(char *ref, unsigned char *sha1)
{
	static int ref_name_start = -1;
	static char filename[PATH_MAX];
	static char hex[41];
	int ifd;
 
	if (ref_name_start < 0) {
		sprintf(filename, "%s/refs/", path);
		ref_name_start = strlen(filename);
	}
	strcpy(filename + ref_name_start, ref);
	ifd = open(filename, O_RDONLY);
	if (ifd < 0) {
		close(ifd);
		fprintf(stderr, "cannot open %s\n", filename);
		return -1;
	}
	if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
		close(ifd);
		fprintf(stderr, "cannot read from %s\n", filename);
		return -1;
	}
	close(ifd);
	pull_say("ref %s\n", sha1_to_hex(sha1));
	return 0;
}
 
static const char *local_pull_usage = 
"git-local-pull [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
 
/* 
 * By default we only use file copy.
 * If -l is specified, a hard link is attempted.
 * If -s is specified, then a symlink is attempted.
 * If -n is _not_ specified, then a regular file-to-file copy is done.
 */
int main(int argc, char **argv)
{
	char *commit_id;
	int arg = 1;
 
	while (arg < argc && argv[arg][0] == '-') {
		if (argv[arg][1] == 't')
			get_tree = 1;
		else if (argv[arg][1] == 'c')
			get_history = 1;
		else if (argv[arg][1] == 'a') {
			get_all = 1;
			get_tree = 1;
			get_history = 1;
		}
		else if (argv[arg][1] == 'l')
			use_link = 1;
		else if (argv[arg][1] == 's')
			use_symlink = 1;
		else if (argv[arg][1] == 'n')
			use_filecopy = 0;
		else if (argv[arg][1] == 'v')
			get_verbosely = 1;
		else if (argv[arg][1] == 'w')
			write_ref = argv[++arg];
		else
			usage(local_pull_usage);
		arg++;
	}
	if (argc < arg + 2)
		usage(local_pull_usage);
	commit_id = argv[arg];
	path = argv[arg + 1];
 
	if (pull(commit_id))
		return 1;
 
	return 0;
}