#include "cache.h"

#include "commit.h"

#include "tree-walk.h"

#include "attr.h"

#include "archive.h"

#include "parse-options.h"

#include "unpack-trees.h"

static char const * const archive_usage[] = {

"git archive [options] <tree-ish> [path...]",

"git archive --list",

"git archive --remote <repo> [--exec <cmd>] [options] <tree-ish> [path...]",

"git archive --remote <repo> [--exec <cmd>] --list",

NULL

};

#define USES_ZLIB_COMPRESSION 1

static const struct archiver {

} 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 = STRBUF_INIT;

if (src == buf->buf)

to_free = strbuf_detach(buf, NULL);

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, DATE_NORMAL);

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 = STRBUF_INIT;

size_t size = 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 (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);

}

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;

struct unpack_trees_options opts;

struct tree_desc t;

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;

/*

* Setup index and instruct attr to read index only

*/

if (!args->worktree_attributes) {

memset(&opts, 0, sizeof(opts));

opts.index_only = 1;

opts.head_idx = -1;

opts.src_index = &the_index;

opts.dst_index = &the_index;

opts.fn = oneway_merge;

init_tree_desc(&t, args->tree->buffer, args->tree->size);

if (unpack_trees(1, &t, &opts))

return -1;

git_attr_set_direction(GIT_ATTR_INDEX, &the_index);

}

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;

if (!name)

return NULL;

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;

}

#define OPT__COMPR(s, v, h, p) \

{ OPTION_SET_INT, (s), NULL, (v), NULL, (h), \

PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }

#define OPT__COMPR_HIDDEN(s, v, p) \

{ OPTION_SET_INT, (s), NULL, (v), NULL, "", \

PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }

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 = NULL;

const char *remote = NULL;

const char *exec = NULL;

const char *output = NULL;

int compression_level = -1;

int verbose = 0;

int i;

int list = 0;

int worktree_attributes = 0;

struct option opts[] = {

OPT_GROUP(""),

OPT_STRING(0, "format", &format, "fmt", "archive format"),

OPT_STRING(0, "prefix", &base, "prefix",

"prepend prefix to each pathname in the archive"),

OPT_STRING(0, "output", &output, "file",

"write the archive to this file"),

OPT_BOOLEAN(0, "worktree-attributes", &worktree_attributes,

"read .gitattributes in working directory"),

OPT__VERBOSE(&verbose),

OPT__COMPR('0', &compression_level, "store only", 0),

OPT__COMPR('1', &compression_level, "compress faster", 1),

OPT__COMPR_HIDDEN('2', &compression_level, 2),

OPT__COMPR_HIDDEN('3', &compression_level, 3),

OPT__COMPR_HIDDEN('4', &compression_level, 4),

OPT__COMPR_HIDDEN('5', &compression_level, 5),

OPT__COMPR_HIDDEN('6', &compression_level, 6),

OPT__COMPR_HIDDEN('7', &compression_level, 7),

OPT__COMPR_HIDDEN('8', &compression_level, 8),

OPT__COMPR('9', &compression_level, "compress better", 9),

OPT_GROUP(""),

OPT_BOOLEAN('l', "list", &list,

"list supported archive formats"),

OPT_GROUP(""),

OPT_STRING(0, "remote", &remote, "repo",

"retrieve the archive from remote repository <repo>"),

OPT_STRING(0, "exec", &exec, "cmd",

"path to the remote git-upload-archive command"),

OPT_END()

};

argc = parse_options(argc, argv, opts, archive_usage, 0);

if (remote)

die("Unexpected option --remote");

if (exec)

die("Option --exec can only be used together with --remote");

if (output)

die("Unexpected option --output");

if (!base)

base = "";

if (list) {

for (i = 0; i < ARRAY_SIZE(archivers); i++)

printf("%s\n", archivers[i].name);

exit(0);

}

/* We need at least one parameter -- tree-ish */

if (argc < 1)

usage_with_options(archive_usage, opts);

*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);

args->worktree_attributes = worktree_attributes;

return argc;

}

int write_archive(int argc, const char **argv, const char *prefix,

int setup_prefix)

{

const struct archiver *ar = NULL;

struct archiver_args args;

argc = parse_archive_args(argc, argv, &ar, &args);

if (setup_prefix && prefix == NULL)

prefix = setup_git_directory();

parse_treeish_arg(argv, &args, prefix);

parse_pathspec_arg(argv + 1, &args);

git_config(git_default_config, NULL);

return ar->write_archive(&args);

}