Merge branch 'mh/ref-api'
[git] / builtin / archive.c
1 /*
2  * Copyright (c) 2006 Franck Bui-Huu
3  * Copyright (c) 2006 Rene Scharfe
4  */
5 #include "cache.h"
6 #include "builtin.h"
7 #include "archive.h"
8 #include "transport.h"
9 #include "parse-options.h"
10 #include "pkt-line.h"
11 #include "sideband.h"
12
13 static void create_output_file(const char *output_file)
14 {
15         int output_fd = open(output_file, O_CREAT | O_WRONLY | O_TRUNC, 0666);
16         if (output_fd < 0)
17                 die_errno(_("could not create archive file '%s'"), output_file);
18         if (output_fd != 1) {
19                 if (dup2(output_fd, 1) < 0)
20                         die_errno(_("could not redirect output"));
21                 else
22                         close(output_fd);
23         }
24 }
25
26 static int run_remote_archiver(int argc, const char **argv,
27                                const char *remote, const char *exec,
28                                const char *name_hint)
29 {
30         char buf[LARGE_PACKET_MAX];
31         int fd[2], i, len, rv;
32         struct transport *transport;
33         struct remote *_remote;
34
35         _remote = remote_get(remote);
36         if (!_remote->url[0])
37                 die(_("git archive: Remote with no URL"));
38         transport = transport_get(_remote, _remote->url[0]);
39         transport_connect(transport, "git-upload-archive", exec, fd);
40
41         /*
42          * Inject a fake --format field at the beginning of the
43          * arguments, with the format inferred from our output
44          * filename. This way explicit --format options can override
45          * it.
46          */
47         if (name_hint) {
48                 const char *format = archive_format_from_filename(name_hint);
49                 if (format)
50                         packet_write(fd[1], "argument --format=%s\n", format);
51         }
52         for (i = 1; i < argc; i++)
53                 packet_write(fd[1], "argument %s\n", argv[i]);
54         packet_flush(fd[1]);
55
56         len = packet_read_line(fd[0], buf, sizeof(buf));
57         if (!len)
58                 die(_("git archive: expected ACK/NAK, got EOF"));
59         if (buf[len-1] == '\n')
60                 buf[--len] = 0;
61         if (strcmp(buf, "ACK")) {
62                 if (len > 5 && !prefixcmp(buf, "NACK "))
63                         die(_("git archive: NACK %s"), buf + 5);
64                 if (len > 4 && !prefixcmp(buf, "ERR "))
65                         die(_("remote error: %s"), buf + 4);
66                 die(_("git archive: protocol error"));
67         }
68
69         len = packet_read_line(fd[0], buf, sizeof(buf));
70         if (len)
71                 die(_("git archive: expected a flush"));
72
73         /* Now, start reading from fd[0] and spit it out to stdout */
74         rv = recv_sideband("archive", fd[0], 1);
75         rv |= transport_disconnect(transport);
76
77         return !!rv;
78 }
79
80 #define PARSE_OPT_KEEP_ALL ( PARSE_OPT_KEEP_DASHDASH |  \
81                              PARSE_OPT_KEEP_ARGV0 |     \
82                              PARSE_OPT_KEEP_UNKNOWN |   \
83                              PARSE_OPT_NO_INTERNAL_HELP )
84
85 int cmd_archive(int argc, const char **argv, const char *prefix)
86 {
87         const char *exec = "git-upload-archive";
88         const char *output = NULL;
89         const char *remote = NULL;
90         struct option local_opts[] = {
91                 OPT_STRING('o', "output", &output, "file",
92                         "write the archive to this file"),
93                 OPT_STRING(0, "remote", &remote, "repo",
94                         "retrieve the archive from remote repository <repo>"),
95                 OPT_STRING(0, "exec", &exec, "cmd",
96                         "path to the remote git-upload-archive command"),
97                 OPT_END()
98         };
99
100         argc = parse_options(argc, argv, prefix, local_opts, NULL,
101                              PARSE_OPT_KEEP_ALL);
102
103         if (output)
104                 create_output_file(output);
105
106         if (remote)
107                 return run_remote_archiver(argc, argv, remote, exec, output);
108
109         setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
110
111         return write_archive(argc, argv, prefix, 1, output, 0);
112 }