#include "cache.h"

#include "refs.h"

#include "commit.h"

#include "tree-walk.h"

#include "attr.h"

#include "archive.h"

#include "parse-options.h"

#include "unpack-trees.h"

#include "dir.h"

static char const * const archive_usage[] = {

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

N_("git archive --list"),

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

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

NULL

};

static const struct archiver **archivers;

static int nr_archivers;

static int alloc_archivers;

static int remote_allow_unreachable;

void register_archiver(struct archiver *ar)

{

ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);

archivers[nr_archivers++] = ar;

}

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;

struct pretty_print_context ctx = {0};

ctx.date_mode.type = DATE_NORMAL;

ctx.abbrev = DEFAULT_ABBREV;

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, &ctx);

len -= c + 1 - src;

src = c + 1;

}

strbuf_add(buf, src, len);

strbuf_release(&fmt);

free(to_free);

}

void *sha1_file_to_archive(const struct archiver_args *args,

const char *path, const unsigned char *sha1,

unsigned int mode, enum object_type *type,

unsigned long *sizep)

{

void *buffer;

const struct commit *commit = args->convert ? args->commit : NULL;

path += args->baselen;

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");

attr_export_subst = git_attr("export-subst");

}

check[0].attr = attr_export_ignore;

check[1].attr = attr_export_subst;

}

struct directory {

};

struct archiver_context {

};

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 err;

args->convert = 0;

strbuf_reset(&path);

strbuf_grow(&path, PATH_MAX);

strbuf_add(&path, args->base, args->baselen);

strbuf_add(&path, base, baselen);

strbuf_addstr(&path, filename);

if (S_ISDIR(mode) || S_ISGITLINK(mode))

strbuf_addch(&path, '/');

path_without_prefix = path.buf + args->baselen;

setup_archive_check(check);

if (!git_check_attr(path_without_prefix, ARRAY_SIZE(check), check)) {

if (ATTR_TRUE(check[0].value))

return 0;

args->convert = ATTR_TRUE(check[1].value);

}

if (S_ISDIR(mode) || S_ISGITLINK(mode)) {

if (args->verbose)

fprintf(stderr, "%.*s\n", (int)path.len, path.buf);

err = write_entry(args, sha1, path.buf, path.len, mode);

if (err)

return err;

return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);

}

if (args->verbose)

fprintf(stderr, "%.*s\n", (int)path.len, path.buf);

return write_entry(args, sha1, path.buf, path.len, mode);

}

static int write_archive_entry_buf(const unsigned char *sha1, struct strbuf *base,

const char *filename, unsigned mode, int stage,

void *context)

{

return write_archive_entry(sha1, base->buf, base->len,

filename, mode, stage, context);

}

static void queue_directory(const unsigned char *sha1,

struct strbuf *base, const char *filename,

unsigned mode, int stage, struct archiver_context *c)

{

struct directory *d;

size_t len = base->len + 1 + strlen(filename) + 1;

d = xmalloc(sizeof(*d) + len);

d->up = c->bottom;

d->baselen = base->len;

d->mode = mode;

d->stage = stage;

c->bottom = d;

d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);

hashcpy(d->oid.hash, sha1);

}

static int write_directory(struct archiver_context *c)

{

struct directory *d = c->bottom;

int ret;

if (!d)

return 0;

c->bottom = d->up;

d->path[d->len - 1] = '\0'; /* no trailing slash */

ret =

write_directory(c) ||

write_archive_entry(d->oid.hash, d->path, d->baselen,

d->path + d->baselen, d->mode,

d->stage, c) != READ_TREE_RECURSIVE;

free(d);

return ret ? -1 : 0;

}

static int queue_or_write_archive_entry(const unsigned char *sha1,

struct strbuf *base, const char *filename,

unsigned mode, int stage, void *context)

{

struct archiver_context *c = context;

while (c->bottom &&

!(base->len >= c->bottom->len &&

!strncmp(base->buf, c->bottom->path, c->bottom->len))) {

struct directory *next = c->bottom->up;

free(c->bottom);

c->bottom = next;

}

if (S_ISDIR(mode)) {

queue_directory(sha1, base, filename,

mode, stage, c);

return READ_TREE_RECURSIVE;

}

if (write_directory(c))

return -1;

return write_archive_entry(sha1, base->buf, base->len, filename, mode,

stage, context);

}

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.oid.hash, args->base,

len, 040777);

if (err)

return err;

}

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

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, "", 0, 0, &args->pathspec,

args->pathspec.has_wildcard ?

queue_or_write_archive_entry :

write_archive_entry_buf,

&context);

if (err == READ_TREE_RECURSIVE)

err = 0;

while (context.bottom) {

struct directory *next = context.bottom->up;

free(context.bottom);

context.bottom = next;

}

return err;

}

static const struct archiver *lookup_archiver(const char *name)

{

int i;

if (!name)

return NULL;

for (i = 0; i < nr_archivers; i++) {

if (!strcmp(name, archivers[i]->name))

return archivers[i];

}

return NULL;

}

static int reject_entry(const unsigned char *sha1, struct strbuf *base,

const char *filename, unsigned mode,

int stage, void *context)

{

int ret = -1;

if (S_ISDIR(mode)) {

struct strbuf sb = STRBUF_INIT;

strbuf_addbuf(&sb, base);

strbuf_addstr(&sb, filename);

if (!match_pathspec(context, sb.buf, sb.len, 0, NULL, 1))

ret = READ_TREE_RECURSIVE;

strbuf_release(&sb);

}

return ret;

}

static int path_exists(struct tree *tree, const char *path)

{

const char *paths[] = { path, NULL };

struct pathspec pathspec;

int ret;

parse_pathspec(&pathspec, 0, 0, "", paths);

pathspec.recursive = 1;

ret = read_tree_recursive(tree, "", 0, 0, &pathspec,

reject_entry, &pathspec);

free_pathspec(&pathspec);

return ret != 0;

}

static void parse_pathspec_arg(const char **pathspec,

struct archiver_args *ar_args)

{

/*

* must be consistent with parse_pathspec in path_exists()

* Also if pathspec patterns are dependent, we're in big

* trouble as we test each one separately

*/

parse_pathspec(&ar_args->pathspec, 0,

PATHSPEC_PREFER_FULL,

"", pathspec);

ar_args->pathspec.recursive = 1;

if (pathspec) {

while (*pathspec) {

if (**pathspec && !path_exists(ar_args->tree, *pathspec))

die(_("pathspec '%s' did not match any files"), *pathspec);

pathspec++;

}

}

}

static void parse_treeish_arg(const char **argv,

struct archiver_args *ar_args, const char *prefix,

int remote)

{

const char *name = argv[0];

const unsigned char *commit_sha1;

time_t archive_time;

struct tree *tree;

const struct commit *commit;

struct object_id oid;

/* Remotes are only allowed to fetch actual refs */

if (remote && !remote_allow_unreachable) {

char *ref = NULL;

const char *colon = strchrnul(name, ':');

int refnamelen = colon - name;

if (!dwim_ref(name, refnamelen, oid.hash, &ref))

die("no such ref: %.*s", refnamelen, name);

free(ref);

}

if (get_sha1(name, oid.hash))

die("Not a valid object name");

commit = lookup_commit_reference_gently(oid.hash, 1);

if (commit) {

commit_sha1 = commit->object.oid.hash;

archive_time = commit->date;

} else {

commit_sha1 = NULL;

archive_time = time(NULL);

}

tree = parse_tree_indirect(oid.hash);

if (tree == NULL)

die("not a tree object");

if (prefix) {

struct object_id tree_oid;

unsigned int mode;

int err;

err = get_tree_entry(tree->object.oid.hash, prefix,

tree_oid.hash, &mode);

if (err || !S_ISDIR(mode))

die("current working directory is untracked");

tree = parse_tree_indirect(tree_oid.hash);

}

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 *name_hint, int is_remote)

{

const char *format = NULL;

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, N_("fmt"), N_("archive format")),

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

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

OPT_STRING('o', "output", &output, N_("file"),

N_("write the archive to this file")),

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

N_("read .gitattributes in working directory")),

OPT__VERBOSE(&verbose, N_("report archived files on stderr")),

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

OPT__COMPR('1', &compression_level, N_("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, N_("compress better"), 9),

OPT_GROUP(""),

OPT_BOOL('l', "list", &list,

N_("list supported archive formats")),

OPT_GROUP(""),

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

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

OPT_STRING(0, "exec", &exec, N_("command"),

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

OPT_END()

};

argc = parse_options(argc, argv, NULL, 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 < nr_archivers; i++)

if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)

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

exit(0);

}

if (!format && name_hint)

format = archive_format_from_filename(name_hint);

if (!format)

format = "tar";

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

if (argc < 1)

usage_with_options(archive_usage, opts);

*ar = lookup_archiver(format);

if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))

die("Unknown archive format '%s'", format);

args->compression_level = Z_DEFAULT_COMPRESSION;

if (compression_level != -1) {

if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)

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 char *name_hint, int remote)

{

int nongit = 0;

const struct archiver *ar = NULL;

struct archiver_args args;

if (setup_prefix && prefix == NULL)

prefix = setup_git_directory_gently(&nongit);

git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);

git_config(git_default_config, NULL);

init_tar_archiver();

init_zip_archiver();

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

if (nongit) {

/*

* We know this will die() with an error, so we could just

* die ourselves; but its error message will be more specific

* than what we could write here.

*/

setup_git_directory();

}

parse_treeish_arg(argv, &args, prefix, remote);

parse_pathspec_arg(argv + 1, &args);

return ar->write_archive(ar, &args);

}

static int match_extension(const char *filename, const char *ext)

{

int prefixlen = strlen(filename) - strlen(ext);

/*

* We need 1 character for the '.', and 1 character to ensure that the

* prefix is non-empty (k.e., we don't match .tar.gz with no actual

* filename).

*/

if (prefixlen < 2 || filename[prefixlen - 1] != '.')

return 0;

return !strcmp(filename + prefixlen, ext);

}

const char *archive_format_from_filename(const char *filename)

{

int i;

for (i = 0; i < nr_archivers; i++)

if (match_extension(filename, archivers[i]->name))

return archivers[i]->name;

return NULL;

}