diff options
Diffstat (limited to 'archive.c')
| -rw-r--r-- | archive.c | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/archive.c b/archive.c new file mode 100644 index 0000000..f834b5f --- /dev/null +++ b/archive.c @@ -0,0 +1,316 @@ +#include "cache.h" +#include "commit.h" +#include "tree-walk.h" +#include "attr.h" +#include "archive.h" + +static const char archive_usage[] = \ +"git archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]"; + +#define USES_ZLIB_COMPRESSION 1 + +const struct archiver { + const char *name; + write_archive_fn_t write_archive; + unsigned int flags; +} archivers[] = { + { "tar", write_tar_archive }, + { "zip", write_zip_archive, USES_ZLIB_COMPRESSION }, +}; + +static void format_subst(const struct commit *commit, + const char *src, size_t len, + struct strbuf *buf) +{ + char *to_free = NULL; + struct strbuf fmt; + + if (src == buf->buf) + to_free = strbuf_detach(buf, NULL); + strbuf_init(&fmt, 0); + for (;;) { + const char *b, *c; + + b = memmem(src, len, "$Format:", 8); + if (!b) + break; + c = memchr(b + 8, '$', (src + len) - b - 8); + if (!c) + break; + + strbuf_reset(&fmt); + strbuf_add(&fmt, b + 8, c - b - 8); + + strbuf_add(buf, src, b - src); + format_commit_message(commit, fmt.buf, buf); + len -= c + 1 - src; + src = c + 1; + } + strbuf_add(buf, src, len); + strbuf_release(&fmt); + free(to_free); +} + +static void *sha1_file_to_archive(const char *path, const unsigned char *sha1, + unsigned int mode, enum object_type *type, + unsigned long *sizep, const struct commit *commit) +{ + void *buffer; + + buffer = read_sha1_file(sha1, type, sizep); + if (buffer && S_ISREG(mode)) { + struct strbuf buf; + size_t size = 0; + + strbuf_init(&buf, 0); + strbuf_attach(&buf, buffer, *sizep, *sizep + 1); + convert_to_working_tree(path, buf.buf, buf.len, &buf); + if (commit) + format_subst(commit, buf.buf, buf.len, &buf); + buffer = strbuf_detach(&buf, &size); + *sizep = size; + } + + return buffer; +} + +static void setup_archive_check(struct git_attr_check *check) +{ + static struct git_attr *attr_export_ignore; + static struct git_attr *attr_export_subst; + + if (!attr_export_ignore) { + attr_export_ignore = git_attr("export-ignore", 13); + attr_export_subst = git_attr("export-subst", 12); + } + check[0].attr = attr_export_ignore; + check[1].attr = attr_export_subst; +} + +struct archiver_context { + struct archiver_args *args; + write_archive_entry_fn_t write_entry; +}; + +static int write_archive_entry(const unsigned char *sha1, const char *base, + int baselen, const char *filename, unsigned mode, int stage, + void *context) +{ + static struct strbuf path = STRBUF_INIT; + struct archiver_context *c = context; + struct archiver_args *args = c->args; + write_archive_entry_fn_t write_entry = c->write_entry; + struct git_attr_check check[2]; + const char *path_without_prefix; + int convert = 0; + int err; + enum object_type type; + unsigned long size; + void *buffer; + + strbuf_reset(&path); + strbuf_grow(&path, PATH_MAX); + strbuf_add(&path, base, baselen); + strbuf_addstr(&path, filename); + path_without_prefix = path.buf + args->baselen; + + setup_archive_check(check); + if (!git_checkattr(path_without_prefix, ARRAY_SIZE(check), check)) { + if (ATTR_TRUE(check[0].value)) + return 0; + convert = ATTR_TRUE(check[1].value); + } + + if (S_ISDIR(mode) || S_ISGITLINK(mode)) { + strbuf_addch(&path, '/'); + if (args->verbose) + fprintf(stderr, "%.*s\n", (int)path.len, path.buf); + err = write_entry(args, sha1, path.buf, path.len, mode, NULL, 0); + if (err) + return err; + return READ_TREE_RECURSIVE; + } + + buffer = sha1_file_to_archive(path_without_prefix, sha1, mode, + &type, &size, convert ? args->commit : NULL); + if (!buffer) + return error("cannot read %s", sha1_to_hex(sha1)); + if (args->verbose) + fprintf(stderr, "%.*s\n", (int)path.len, path.buf); + err = write_entry(args, sha1, path.buf, path.len, mode, buffer, size); + free(buffer); + return err; +} + +int write_archive_entries(struct archiver_args *args, + write_archive_entry_fn_t write_entry) +{ + struct archiver_context context; + int err; + + if (args->baselen > 0 && args->base[args->baselen - 1] == '/') { + size_t len = args->baselen; + + while (len > 1 && args->base[len - 2] == '/') + len--; + if (args->verbose) + fprintf(stderr, "%.*s\n", (int)len, args->base); + err = write_entry(args, args->tree->object.sha1, args->base, + len, 040777, NULL, 0); + if (err) + return err; + } + + context.args = args; + context.write_entry = write_entry; + + err = read_tree_recursive(args->tree, args->base, args->baselen, 0, + args->pathspec, write_archive_entry, &context); + if (err == READ_TREE_RECURSIVE) + err = 0; + return err; +} + +static const struct archiver *lookup_archiver(const char *name) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(archivers); i++) { + if (!strcmp(name, archivers[i].name)) + return &archivers[i]; + } + return NULL; +} + +static void parse_pathspec_arg(const char **pathspec, + struct archiver_args *ar_args) +{ + ar_args->pathspec = get_pathspec(ar_args->base, pathspec); +} + +static void parse_treeish_arg(const char **argv, + struct archiver_args *ar_args, const char *prefix) +{ + const char *name = argv[0]; + const unsigned char *commit_sha1; + time_t archive_time; + struct tree *tree; + const struct commit *commit; + unsigned char sha1[20]; + + if (get_sha1(name, sha1)) + die("Not a valid object name"); + + commit = lookup_commit_reference_gently(sha1, 1); + if (commit) { + commit_sha1 = commit->object.sha1; + archive_time = commit->date; + } else { + commit_sha1 = NULL; + archive_time = time(NULL); + } + + tree = parse_tree_indirect(sha1); + if (tree == NULL) + die("not a tree object"); + + if (prefix) { + unsigned char tree_sha1[20]; + unsigned int mode; + int err; + + err = get_tree_entry(tree->object.sha1, prefix, + tree_sha1, &mode); + if (err || !S_ISDIR(mode)) + die("current working directory is untracked"); + + tree = parse_tree_indirect(tree_sha1); + } + ar_args->tree = tree; + ar_args->commit_sha1 = commit_sha1; + ar_args->commit = commit; + ar_args->time = archive_time; +} + +static int parse_archive_args(int argc, const char **argv, + const struct archiver **ar, struct archiver_args *args) +{ + const char *format = "tar"; + const char *base = ""; + int compression_level = -1; + int verbose = 0; + int i; + + for (i = 1; i < argc; i++) { + const char *arg = argv[i]; + + if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) { + for (i = 0; i < ARRAY_SIZE(archivers); i++) + printf("%s\n", archivers[i].name); + exit(0); + } + if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) { + verbose = 1; + continue; + } + if (!prefixcmp(arg, "--format=")) { + format = arg + 9; + continue; + } + if (!prefixcmp(arg, "--prefix=")) { + base = arg + 9; + continue; + } + if (!strcmp(arg, "--")) { + i++; + break; + } + if (arg[0] == '-' && isdigit(arg[1]) && arg[2] == '\0') { + compression_level = arg[1] - '0'; + continue; + } + if (arg[0] == '-') + die("Unknown argument: %s", arg); + break; + } + + /* We need at least one parameter -- tree-ish */ + if (argc - 1 < i) + usage(archive_usage); + *ar = lookup_archiver(format); + if (!*ar) + die("Unknown archive format '%s'", format); + + args->compression_level = Z_DEFAULT_COMPRESSION; + if (compression_level != -1) { + if ((*ar)->flags & USES_ZLIB_COMPRESSION) + args->compression_level = compression_level; + else { + die("Argument not supported for format '%s': -%d", + format, compression_level); + } + } + args->verbose = verbose; + args->base = base; + args->baselen = strlen(base); + + return i; +} + +int write_archive(int argc, const char **argv, const char *prefix, + int setup_prefix) +{ + const struct archiver *ar = NULL; + struct archiver_args args; + int tree_idx; + + tree_idx = parse_archive_args(argc, argv, &ar, &args); + if (setup_prefix && prefix == NULL) + prefix = setup_git_directory(); + + argv += tree_idx; + parse_treeish_arg(argv, &args, prefix); + parse_pathspec_arg(argv + 1, &args); + + return ar->write_archive(&args); +} |