Andrew's git - gitweb.git/blob

   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
   8static 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
  18const 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
  27static 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
  60static 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
  83static 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
  96struct archiver_context {
  97        struct archiver_args *args;
  98        write_archive_entry_fn_t write_entry;
  99};
 100
 101static 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
 151int 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
 180static 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
 194static 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
 200static 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
 251static 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
 328int 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}