ui-snapshot.c

   1 /* ui-snapshot.c: generate snapshot of a commit
   2  *
   3  * Copyright (C) 2006 Lars Hjemli
   4  *
   5  * Licensed under GNU General Public License v2
   6  *   (see COPYING for full license text)
   7  */
   8
   9 #include "cgit.h"
  10 #include "html.h"
  11 #include "ui-shared.h"
  12
  13 static int write_compressed_tar_archive(struct archiver_args *args,const char *filter)
  14 {
  15         int rw[2];
  16         pid_t gzpid;
  17         int stdout2;
  18         int status;
  19         int rv;
  20
  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");
  24         if(gzpid==0) {
  25                 /* child */
  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);
  30                 _exit(-1);
  31         }
  32         /* parent */
  33         chk_zero(close(rw[0]), "Closing read end of pipe");
  34         chk_non_negative(dup2(rw[1],STDOUT_FILENO), "Redirecting output to compressor");
  35
  36         rv = write_tar_archive(args);
  37
  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");
  45
  46         return rv;
  47 }
  48
  49 static int write_tar_gzip_archive(struct archiver_args *args)
  50 {
  51         return write_compressed_tar_archive(args,"gzip");
  52 }
  53
  54 static int write_tar_bzip2_archive(struct archiver_args *args)
  55 {
  56         return write_compressed_tar_archive(args,"bzip2");
  57 }
  58
  59 const struct cgit_snapshot_format cgit_snapshot_formats[] = {
  60         { ".zip", "application/x-zip", write_zip_archive, 0x1 },
  61         { ".tar.gz", "application/x-tar", write_tar_gzip_archive, 0x2 },
  62         { ".tar.bz2", "application/x-tar", write_tar_bzip2_archive, 0x4 },
  63         { ".tar", "application/x-tar", write_tar_archive, 0x8 },
  64         {}
  65 };
  66
  67 static const struct cgit_snapshot_format *get_format(const char *filename)
  68 {
  69         const struct cgit_snapshot_format *fmt;
  70         int fl, sl;
  71
  72         fl = strlen(filename);
  73         for(fmt = cgit_snapshot_formats; fmt->suffix; fmt++) {
  74                 sl = strlen(fmt->suffix);
  75                 if (sl >= fl)
  76                         continue;
  77                 if (!strcmp(fmt->suffix, filename + fl - sl))
  78                         return fmt;
  79         }
  80         return NULL;
  81 }
  82
  83 static int make_snapshot(const struct cgit_snapshot_format *format,
  84                          const char *hex, const char *prefix,
  85                          const char *filename)
  86 {
  87         struct archiver_args args;
  88         struct commit *commit;
  89         unsigned char sha1[20];
  90
  91         if(get_sha1(hex, sha1)) {
  92                 cgit_print_error(fmt("Bad object id: %s", hex));
  93                 return 1;
  94         }
  95         commit = lookup_commit_reference(sha1);
  96         if(!commit) {
  97                 cgit_print_error(fmt("Not a commit reference: %s", hex));
  98                 return 1;
  99         }
 100         memset(&args, 0, sizeof(args));
 101         if (prefix) {
 102                 args.base = fmt("%s/", prefix);
 103                 args.baselen = strlen(prefix) + 1;
 104         } else {
 105                 args.base = "";
 106                 args.baselen = 0;
 107         }
 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);
 114         return 0;
 115 }
 116
 117 char *dwim_filename = NULL;
 118 const char *dwim_refname = NULL;
 119
 120 static int ref_cb(const char *refname, const unsigned char *sha1, int flags,
 121                   void *cb_data)
 122 {
 123         const char *r = refname;
 124         while (r && *r) {
 125                 fprintf(stderr, "  cmp %s with %s:", dwim_filename, r);
 126                 if (!strcmp(dwim_filename, r)) {
 127                         fprintf(stderr, "MATCH!\n");
 128                         dwim_refname = refname;
 129                         return 1;
 130                 }
 131                 fprintf(stderr, "no match\n");
 132                 if (isdigit(*r))
 133                         break;
 134                 r++;
 135         }
 136         return 0;
 137 }
 138
 139 /* Try to guess the requested revision by combining repo name and tag name
 140  * and comparing this to the requested snapshot name. E.g. the requested
 141  * snapshot is "cgit-0.7.2.tar.gz" while repo name is "cgit" and tag name
 142  * is "v0.7.2". First, the reponame is stripped off, leaving "-0.7.2.tar.gz".
 143  * Next, any '-' and '_' characters are stripped, leaving "0.7.2.tar.gz".
 144  * Finally, the requested format suffix is removed and we end up with "0.7.2".
 145  * Then we test each tag against this dwimmed filename, and for each tag
 146  * we even try to remove any leading characters which are non-digits. I.e.
 147  * we first compare with "v0.7.2", then with "0.7.2" and we've got a match.
 148  */
 149 static const char *get_ref_from_filename(const char *url, const char *filename,
 150                                          const struct cgit_snapshot_format *fmt)
 151 {
 152         const char *reponame = cgit_repobasename(url);
 153         fprintf(stderr, "reponame=%s, filename=%s\n", reponame, filename);
 154         if (prefixcmp(filename, reponame))
 155                 return NULL;
 156         filename += strlen(reponame);
 157         while (filename && (*filename == '-' || *filename == '_'))
 158                 filename++;
 159         dwim_filename = xstrdup(filename);
 160         dwim_filename[strlen(filename) - strlen(fmt->suffix)] = '\0';
 161         for_each_tag_ref(ref_cb, NULL);
 162         return dwim_refname;
 163 }
 164
 165 void cgit_print_snapshot(const char *head, const char *hex, const char *prefix,
 166                          const char *filename, int snapshots, int dwim)
 167 {
 168         const struct cgit_snapshot_format* f;
 169
 170         f = get_format(filename);
 171         if (!f) {
 172                 ctx.page.mimetype = "text/html";
 173                 cgit_print_http_headers(&ctx);
 174                 cgit_print_docstart(&ctx);
 175                 cgit_print_pageheader(&ctx);
 176                 cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
 177                 cgit_print_docend();
 178                 return;
 179         }
 180
 181         if (!hex && dwim)
 182                 hex = get_ref_from_filename(ctx.repo->url, filename, f);
 183
 184         if (!hex)
 185                 hex = head;
 186
 187         make_snapshot(f, hex, prefix, filename);
 188 }