1 /* ui-snapshot.c: generate snapshot of a commit
3 * Copyright (C) 2006 Lars Hjemli
5 * Licensed under GNU General Public License v2
6 * (see COPYING for full license text)
11 #include "ui-shared.h"
13 static int write_compressed_tar_archive(struct archiver_args *args,const char *filter)
21 stdout2 = chk_non_negative(dup(STDIN_FILENO), "Preserving STDOUT before compressing");
22 chk_zero(pipe(rw), "Opening pipe from compressor subprocess");
23 gzpid = chk_non_negative(fork(), "Forking compressor subprocess");
26 chk_zero(close(rw[1]), "Closing write end of pipe in child");
27 chk_zero(close(STDIN_FILENO), "Closing STDIN");
28 chk_non_negative(dup2(rw[0],STDIN_FILENO), "Redirecting compressor input to stdin");
29 execlp(filter,filter,NULL);
33 chk_zero(close(rw[0]), "Closing read end of pipe");
34 chk_non_negative(dup2(rw[1],STDOUT_FILENO), "Redirecting output to compressor");
36 rv = write_tar_archive(args);
38 chk_zero(close(STDOUT_FILENO), "Closing STDOUT redirected to compressor");
39 chk_non_negative(dup2(stdout2,STDOUT_FILENO), "Restoring uncompressed STDOUT");
40 chk_zero(close(stdout2), "Closing uncompressed STDOUT");
41 chk_zero(close(rw[1]), "Closing write end of pipe in parent");
42 chk_positive(waitpid(gzpid,&status,0), "Waiting on compressor process");
43 if(! ( WIFEXITED(status) && WEXITSTATUS(status)==0 ) )
44 cgit_print_error("Failed to compress archive");
49 static int write_tar_gzip_archive(struct archiver_args *args)
51 return write_compressed_tar_archive(args,"gzip");
54 static int write_tar_bzip2_archive(struct archiver_args *args)
56 return write_compressed_tar_archive(args,"bzip2");
59 const struct cgit_snapshot_format cgit_snapshot_formats[] = {
60 { ".zip", "application/x-zip", write_zip_archive, 0x1 },
61 { ".tar.gz", "application/x-gzip", write_tar_gzip_archive, 0x2 },
62 { ".tar.bz2", "application/x-bzip2", write_tar_bzip2_archive, 0x4 },
63 { ".tar", "application/x-tar", write_tar_archive, 0x8 },
67 static const struct cgit_snapshot_format *get_format(const char *filename)
69 const struct cgit_snapshot_format *fmt;
72 fl = strlen(filename);
73 for(fmt = cgit_snapshot_formats; fmt->suffix; fmt++) {
74 sl = strlen(fmt->suffix);
77 if (!strcmp(fmt->suffix, filename + fl - sl))
83 static int make_snapshot(const struct cgit_snapshot_format *format,
84 const char *hex, const char *prefix,
87 struct archiver_args args;
88 struct commit *commit;
89 unsigned char sha1[20];
91 if(get_sha1(hex, sha1)) {
92 cgit_print_error(fmt("Bad object id: %s", hex));
95 commit = lookup_commit_reference(sha1);
97 cgit_print_error(fmt("Not a commit reference: %s", hex));
100 memset(&args, 0, sizeof(args));
102 args.base = fmt("%s/", prefix);
103 args.baselen = strlen(prefix) + 1;
108 args.tree = commit->tree;
109 args.time = commit->date;
110 ctx.page.mimetype = xstrdup(format->mimetype);
111 ctx.page.filename = xstrdup(filename);
112 cgit_print_http_headers(&ctx);
113 format->write_func(&args);
117 /* Try to guess the requested revision from the requested snapshot name.
118 * First the format extension is stripped, e.g. "cgit-0.7.2.tar.gz" become
119 * "cgit-0.7.2". If this is a valid commit object name we've got a winner.
120 * Otherwise, if the snapshot name has a prefix matching the result from
121 * repo_basename(), we strip the basename and any following '-' and '_'
122 * characters ("cgit-0.7.2" -> "0.7.2") and check the resulting name once
123 * more. If this still isn't a valid commit object name, we check if pre-
124 * pending a 'v' to the remaining snapshot name ("0.7.2" -> "v0.7.2") gives
125 * us something valid.
127 static const char *get_ref_from_filename(const char *url, const char *filename,
128 const struct cgit_snapshot_format *format)
130 const char *reponame;
131 unsigned char sha1[20];
134 snapshot = xstrdup(filename);
135 snapshot[strlen(snapshot) - strlen(format->suffix)] = '\0';
136 fprintf(stderr, "snapshot=%s\n", snapshot);
138 if (get_sha1(snapshot, sha1) == 0)
141 reponame = cgit_repobasename(url);
142 fprintf(stderr, "reponame=%s\n", reponame);
143 if (prefixcmp(snapshot, reponame) == 0) {
144 snapshot += strlen(reponame);
145 while (snapshot && (*snapshot == '-' || *snapshot == '_'))
149 if (get_sha1(snapshot, sha1) == 0)
152 snapshot = fmt("v%s", snapshot);
153 if (get_sha1(snapshot, sha1) == 0)
159 void cgit_print_snapshot(const char *head, const char *hex,
160 const char *filename, int snapshots, int dwim)
162 const struct cgit_snapshot_format* f;
165 f = get_format(filename);
167 ctx.page.mimetype = "text/html";
168 cgit_print_http_headers(&ctx);
169 cgit_print_docstart(&ctx);
170 cgit_print_pageheader(&ctx);
171 cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
177 hex = get_ref_from_filename(ctx.repo->url, filename, f);
179 html_status(404, "Not found", 0);
182 prefix = xstrdup(filename);
183 prefix[strlen(filename) - strlen(f->suffix)] = '\0';
190 prefix = xstrdup(cgit_repobasename(ctx.repo->url));
192 make_snapshot(f, hex, prefix, filename);