aboutsummaryrefslogtreecommitdiff
path: root/fetch-clone.c
blob: 859f4009419d37c2a21ecf6941aaad4fe004e747 (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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
#include "cache.h"
#include "exec_cmd.h"
#include <sys/wait.h>

static int finish_pack(const char *pack_tmp_name, const char *me)
{
	int pipe_fd[2];
	pid_t pid;
	char idx[PATH_MAX];
	char final[PATH_MAX];
	char hash[41];
	unsigned char sha1[20];
	char *cp;
	int err = 0;

	if (pipe(pipe_fd) < 0)
		die("%s: unable to set up pipe", me);

	strcpy(idx, pack_tmp_name); /* ".git/objects/pack-XXXXXX" */
	cp = strrchr(idx, '/');
	memcpy(cp, "/pidx", 5);

	pid = fork();
	if (pid < 0)
		die("git-clone-pack: unable to fork off git-index-pack");
	if (!pid) {
		close(0);
		dup2(pipe_fd[1], 1);
		close(pipe_fd[0]);
		close(pipe_fd[1]);
		execl_git_cmd("index-pack", "-o", idx, pack_tmp_name, NULL);
		error("cannot exec git-index-pack <%s> <%s>",
		      idx, pack_tmp_name);
		exit(1);
	}
	close(pipe_fd[1]);
	if (read(pipe_fd[0], hash, 40) != 40) {
		error("%s: unable to read from git-index-pack", me);
		err = 1;
	}
	close(pipe_fd[0]);

	for (;;) {
		int status, code;
		int retval = waitpid(pid, &status, 0);

		if (retval < 0) {
			if (errno == EINTR)
				continue;
			error("waitpid failed (%s)", strerror(errno));
			goto error_die;
		}
		if (WIFSIGNALED(status)) {
			int sig = WTERMSIG(status);
			error("git-index-pack died of signal %d", sig);
			goto error_die;
		}
		if (!WIFEXITED(status)) {
			error("git-index-pack died of unnatural causes %d",
			      status);
			goto error_die;
		}
		code = WEXITSTATUS(status);
		if (code) {
			error("git-index-pack died with error code %d", code);
			goto error_die;
		}
		if (err)
			goto error_die;
		break;
	}
	hash[40] = 0;
	if (get_sha1_hex(hash, sha1)) {
		error("git-index-pack reported nonsense '%s'", hash);
		goto error_die;
	}
	/* Now we have pack in pack_tmp_name[], and
	 * idx in idx[]; rename them to their final names.
	 */
	snprintf(final, sizeof(final),
		 "%s/pack/pack-%s.pack", get_object_directory(), hash);
	move_temp_to_file(pack_tmp_name, final);
	chmod(final, 0444);
	snprintf(final, sizeof(final),
		 "%s/pack/pack-%s.idx", get_object_directory(), hash);
	move_temp_to_file(idx, final);
	chmod(final, 0444);
	return 0;

 error_die:
	unlink(idx);
	unlink(pack_tmp_name);
	exit(1);
}

int receive_unpack_pack(int fd[2], const char *me, int quiet)
{
	int status;
	pid_t pid;

	pid = fork();
	if (pid < 0)
		die("%s: unable to fork off git-unpack-objects", me);
	if (!pid) {
		dup2(fd[0], 0);
		close(fd[0]);
		close(fd[1]);
		execl_git_cmd("unpack-objects", quiet ? "-q" : NULL, NULL);
		die("git-unpack-objects exec failed");
	}
	close(fd[0]);
	close(fd[1]);
	while (waitpid(pid, &status, 0) < 0) {
		if (errno != EINTR)
			die("waiting for git-unpack-objects: %s",
			    strerror(errno));
	}
	if (WIFEXITED(status)) {
		int code = WEXITSTATUS(status);
		if (code)
			die("git-unpack-objects died with error code %d",
			    code);
		return 0;
	}
	if (WIFSIGNALED(status)) {
		int sig = WTERMSIG(status);
		die("git-unpack-objects died of signal %d", sig);
	}
	die("git-unpack-objects died of unnatural causes %d", status);
}

int receive_keep_pack(int fd[2], const char *me)
{
	char tmpfile[PATH_MAX];
	int ofd, ifd;

	ifd = fd[0];
	snprintf(tmpfile, sizeof(tmpfile),
		 "%s/pack/tmp-XXXXXX", get_object_directory());
	ofd = mkstemp(tmpfile);
	if (ofd < 0)
		return error("unable to create temporary file %s", tmpfile);

	while (1) {
		char buf[8192];
		ssize_t sz, wsz, pos;
		sz = read(ifd, buf, sizeof(buf));
		if (sz == 0)
			break;
		if (sz < 0) {
			error("error reading pack (%s)", strerror(errno));
			close(ofd);
			unlink(tmpfile);
			return -1;
		}
		pos = 0;
		while (pos < sz) {
			wsz = write(ofd, buf + pos, sz - pos);
			if (wsz < 0) {
				error("error writing pack (%s)",
				      strerror(errno));
				close(ofd);
				unlink(tmpfile);
				return -1;
			}
			pos += wsz;
		}
	}
	close(ofd);
	return finish_pack(tmpfile, me);
}