archive.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "tree-walk.h"
   4 #include "attr.h"
   5 #include "archive.h"
   6 #include "parse-options.h"
   7
   8 static char const * const archive_usage[] = {
   9         "git archive [options] <tree-ish> [path...]",
  10         "git archive --list",
  11         "git archive --remote <repo> [--exec <cmd>] [options] <tree-ish> [path...]",
  12         "git archive --remote <repo> [--exec <cmd>] --list",
  13         NULL
  14 };
  15
  16 #define USES_ZLIB_COMPRESSION 1
  17
  18 const struct archiver {
  19         const char *name;
  20         write_archive_fn_t write_archive;
  21         unsigned int flags;
  22 } archivers[] = {
  23         { "tar", write_tar_archive },
  24         { "zip", write_zip_archive, USES_ZLIB_COMPRESSION },
  25 };
  26
  27 static void format_subst(const struct commit *commit,
  28                          const char *src, size_t len,
  29                          struct strbuf *buf)
  30 {
  31         char *to_free = NULL;
  32         struct strbuf fmt;
  33
  34         if (src == buf->buf)
  35                 to_free = strbuf_detach(buf, NULL);
  36         strbuf_init(&fmt, 0);
  37         for (;;) {
  38                 const char *b, *c;
  39
  40                 b = memmem(src, len, "$Format:", 8);
  41                 if (!b)
  42                         break;
  43                 c = memchr(b + 8, '$', (src + len) - b - 8);
  44                 if (!c)
  45                         break;
  46
  47                 strbuf_reset(&fmt);
  48                 strbuf_add(&fmt, b + 8, c - b - 8);
  49
  50                 strbuf_add(buf, src, b - src);
  51                 format_commit_message(commit, fmt.buf, buf);
  52                 len -= c + 1 - src;
  53                 src  = c + 1;
  54         }
  55         strbuf_add(buf, src, len);
  56         strbuf_release(&fmt);
  57         free(to_free);
  58 }
  59
  60 static void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
  61                 unsigned int mode, enum object_type *type,
  62                 unsigned long *sizep, const struct commit *commit)
  63 {
  64         void *buffer;
  65
  66         buffer = read_sha1_file(sha1, type, sizep);
  67         if (buffer && S_ISREG(mode)) {
  68                 struct strbuf buf;
  69                 size_t size = 0;
  70
  71                 strbuf_init(&buf, 0);
  72                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  73                 convert_to_working_tree(path, buf.buf, buf.len, &buf);
  74                 if (commit)
  75                         format_subst(commit, buf.buf, buf.len, &buf);
  76                 buffer = strbuf_detach(&buf, &size);
  77                 *sizep = size;
  78         }
  79
  80         return buffer;
  81 }
  82
  83 static void setup_archive_check(struct git_attr_check *check)
  84 {
  85         static struct git_attr *attr_export_ignore;
  86         static struct git_attr *attr_export_subst;
  87
  88         if (!attr_export_ignore) {
  89                 attr_export_ignore = git_attr("export-ignore", 13);
  90                 attr_export_subst = git_attr("export-subst", 12);
  91         }
  92         check[0].attr = attr_export_ignore;
  93         check[1].attr = attr_export_subst;
  94 }
  95
  96 struct archiver_context {
  97         struct archiver_args *args;
  98         write_archive_entry_fn_t write_entry;
  99 };
 100
 101 static int write_archive_entry(const unsigned char *sha1, const char *base,
 102                 int baselen, const char *filename, unsigned mode, int stage,
 103                 void *context)
 104 {
 105         static struct strbuf path = STRBUF_INIT;
 106         struct archiver_context *c = context;
 107         struct archiver_args *args = c->args;
 108         write_archive_entry_fn_t write_entry = c->write_entry;
 109         struct git_attr_check check[2];
 110         const char *path_without_prefix;
 111         int convert = 0;
 112         int err;
 113         enum object_type type;
 114         unsigned long size;
 115         void *buffer;
 116
 117         strbuf_reset(&path);
 118         strbuf_grow(&path, PATH_MAX);
 119         strbuf_add(&path, base, baselen);
 120         strbuf_addstr(&path, filename);
 121         path_without_prefix = path.buf + args->baselen;
 122
 123         setup_archive_check(check);
 124         if (!git_checkattr(path_without_prefix, ARRAY_SIZE(check), check)) {
 125                 if (ATTR_TRUE(check[0].value))
 126                         return 0;
 127                 convert = ATTR_TRUE(check[1].value);
 128         }
 129
 130         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 131                 strbuf_addch(&path, '/');
 132                 if (args->verbose)
 133                         fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 134                 err = write_entry(args, sha1, path.buf, path.len, mode, NULL, 0);
 135                 if (err)
 136                         return err;
 137                 return READ_TREE_RECURSIVE;
 138         }
 139
 140         buffer = sha1_file_to_archive(path_without_prefix, sha1, mode,
 141                         &type, &size, convert ? args->commit : NULL);
 142         if (!buffer)
 143                 return error("cannot read %s", sha1_to_hex(sha1));
 144         if (args->verbose)
 145                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 146         err = write_entry(args, sha1, path.buf, path.len, mode, buffer, size);
 147         free(buffer);
 148         return err;
 149 }
 150
 151 int write_archive_entries(struct archiver_args *args,
 152                 write_archive_entry_fn_t write_entry)
 153 {
 154         struct archiver_context context;
 155         int err;
 156
 157         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 158                 size_t len = args->baselen;
 159
 160                 while (len > 1 && args->base[len - 2] == '/')
 161                         len--;
 162                 if (args->verbose)
 163                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 164                 err = write_entry(args, args->tree->object.sha1, args->base,
 165                                 len, 040777, NULL, 0);
 166                 if (err)
 167                         return err;
 168         }
 169
 170         context.args = args;
 171         context.write_entry = write_entry;
 172
 173         err =  read_tree_recursive(args->tree, args->base, args->baselen, 0,
 174                         args->pathspec, write_archive_entry, &context);
 175         if (err == READ_TREE_RECURSIVE)
 176                 err = 0;
 177         return err;
 178 }
 179
 180 static const struct archiver *lookup_archiver(const char *name)
 181 {
 182         int i;
 183
 184         if (!name)
 185                 return NULL;
 186
 187         for (i = 0; i < ARRAY_SIZE(archivers); i++) {
 188                 if (!strcmp(name, archivers[i].name))
 189                         return &archivers[i];
 190         }
 191         return NULL;
 192 }
 193
 194 static void parse_pathspec_arg(const char **pathspec,
 195                 struct archiver_args *ar_args)
 196 {
 197         ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
 198 }
 199
 200 static void parse_treeish_arg(const char **argv,
 201                 struct archiver_args *ar_args, const char *prefix)
 202 {
 203         const char *name = argv[0];
 204         const unsigned char *commit_sha1;
 205         time_t archive_time;
 206         struct tree *tree;
 207         const struct commit *commit;
 208         unsigned char sha1[20];
 209
 210         if (get_sha1(name, sha1))
 211                 die("Not a valid object name");
 212
 213         commit = lookup_commit_reference_gently(sha1, 1);
 214         if (commit) {
 215                 commit_sha1 = commit->object.sha1;
 216                 archive_time = commit->date;
 217         } else {
 218                 commit_sha1 = NULL;
 219                 archive_time = time(NULL);
 220         }
 221
 222         tree = parse_tree_indirect(sha1);
 223         if (tree == NULL)
 224                 die("not a tree object");
 225
 226         if (prefix) {
 227                 unsigned char tree_sha1[20];
 228                 unsigned int mode;
 229                 int err;
 230
 231                 err = get_tree_entry(tree->object.sha1, prefix,
 232                                      tree_sha1, &mode);
 233                 if (err || !S_ISDIR(mode))
 234                         die("current working directory is untracked");
 235
 236                 tree = parse_tree_indirect(tree_sha1);
 237         }
 238         ar_args->tree = tree;
 239         ar_args->commit_sha1 = commit_sha1;
 240         ar_args->commit = commit;
 241         ar_args->time = archive_time;
 242 }
 243
 244 #define OPT__COMPR(s, v, h, p) \
 245         { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 246           PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 247 #define OPT__COMPR_HIDDEN(s, v, p) \
 248         { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 249           PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 250
 251 static int parse_archive_args(int argc, const char **argv,
 252                 const struct archiver **ar, struct archiver_args *args)
 253 {
 254         const char *format = "tar";
 255         const char *base = NULL;
 256         const char *remote = NULL;
 257         const char *exec = NULL;
 258         int compression_level = -1;
 259         int verbose = 0;
 260         int i;
 261         int list = 0;
 262         struct option opts[] = {
 263                 OPT_GROUP(""),
 264                 OPT_STRING(0, "format", &format, "fmt", "archive format"),
 265                 OPT_STRING(0, "prefix", &base, "prefix",
 266                         "prepend prefix to each pathname in the archive"),
 267                 OPT__VERBOSE(&verbose),
 268                 OPT__COMPR('0', &compression_level, "store only", 0),
 269                 OPT__COMPR('1', &compression_level, "compress faster", 1),
 270                 OPT__COMPR_HIDDEN('2', &compression_level, 2),
 271                 OPT__COMPR_HIDDEN('3', &compression_level, 3),
 272                 OPT__COMPR_HIDDEN('4', &compression_level, 4),
 273                 OPT__COMPR_HIDDEN('5', &compression_level, 5),
 274                 OPT__COMPR_HIDDEN('6', &compression_level, 6),
 275                 OPT__COMPR_HIDDEN('7', &compression_level, 7),
 276                 OPT__COMPR_HIDDEN('8', &compression_level, 8),
 277                 OPT__COMPR('9', &compression_level, "compress better", 9),
 278                 OPT_GROUP(""),
 279                 OPT_BOOLEAN('l', "list", &list,
 280                         "list supported archive formats"),
 281                 OPT_GROUP(""),
 282                 OPT_STRING(0, "remote", &remote, "repo",
 283                         "retrieve the archive from remote repository <repo>"),
 284                 OPT_STRING(0, "exec", &exec, "cmd",
 285                         "path to the remote git-upload-archive command"),
 286                 OPT_END()
 287         };
 288
 289         argc = parse_options(argc, argv, opts, archive_usage, 0);
 290
 291         if (remote)
 292                 die("Unexpected option --remote");
 293         if (exec)
 294                 die("Option --exec can only be used together with --remote");
 295
 296         if (!base)
 297                 base = "";
 298
 299         if (list) {
 300                 for (i = 0; i < ARRAY_SIZE(archivers); i++)
 301                         printf("%s\n", archivers[i].name);
 302                 exit(0);
 303         }
 304
 305         /* We need at least one parameter -- tree-ish */
 306         if (argc < 1)
 307                 usage_with_options(archive_usage, opts);
 308         *ar = lookup_archiver(format);
 309         if (!*ar)
 310                 die("Unknown archive format '%s'", format);
 311
 312         args->compression_level = Z_DEFAULT_COMPRESSION;
 313         if (compression_level != -1) {
 314                 if ((*ar)->flags & USES_ZLIB_COMPRESSION)
 315                         args->compression_level = compression_level;
 316                 else {
 317                         die("Argument not supported for format '%s': -%d",
 318                                         format, compression_level);
 319                 }
 320         }
 321         args->verbose = verbose;
 322         args->base = base;
 323         args->baselen = strlen(base);
 324
 325         return argc;
 326 }
 327
 328 int write_archive(int argc, const char **argv, const char *prefix,
 329                 int setup_prefix)
 330 {
 331         const struct archiver *ar = NULL;
 332         struct archiver_args args;
 333
 334         argc = parse_archive_args(argc, argv, &ar, &args);
 335         if (setup_prefix && prefix == NULL)
 336                 prefix = setup_git_directory();
 337
 338         parse_treeish_arg(argv, &args, prefix);
 339         parse_pathspec_arg(argv + 1, &args);
 340
 341         return ar->write_archive(&args);
 342 }