Sandbox::https://github.com/schacon/git/blob/master/archive.c

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#define USE_THE_REPOSITORY_VARIABLE

#define DISABLE_SIGN_COMPARE_WARNINGS

#include "git-compat-util.h"

#include "abspath.h"

#include "config.h"

#include "convert.h"

#include "environment.h"

#include "gettext.h"

#include "git-zlib.h"

#include "hex.h"

#include "object-name.h"

#include "path.h"

#include "pretty.h"

#include "setup.h"

#include "refs.h"

#include "odb.h"

#include "commit.h"

#include "tree.h"

#include "tree-walk.h"

#include "attr.h"

#include "archive.h"

#include "parse-options.h"

#include "unpack-trees.h"

#include "quote.h"

static char const * const archive_usage[] = {

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

"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;

}

void init_archivers(void)

{

init_tar_archiver();

init_zip_archiver();

}

static void format_subst(const struct commit *commit,

const char *src, size_t len,

struct strbuf *buf, struct pretty_print_context *ctx)

{

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);

repo_format_commit_message(the_repository, commit, fmt.buf,

buf, ctx);

len -= c + 1 - src;

src = c + 1;

}

strbuf_add(buf, src, len);

strbuf_release(&fmt);

free(to_free);

}

static void *object_file_to_archive(const struct archiver_args *args,

const char *path,

const struct object_id *oid,

unsigned int mode,

enum object_type *type,

size_t *sizep)

{

void *buffer;

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

struct checkout_metadata meta;

init_checkout_metadata(&meta, args->refname,

args->commit_oid ? args->commit_oid :

(args->tree ? &args->tree->object.oid : NULL), oid);

path += args->baselen;

buffer = odb_read_object(the_repository->objects, oid, 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(args->repo->index, path, buf.buf, buf.len, &buf, &meta);

if (commit)

format_subst(commit, buf.buf, buf.len, &buf, args->pretty_ctx);

buffer = strbuf_detach(&buf, &size);

*sizep = size;

}

return buffer;

}

struct directory {

struct directory *up;

struct object_id oid;

int baselen, len;

unsigned mode;

char path[FLEX_ARRAY];

};

struct archiver_context {

struct archiver_args *args;

write_archive_entry_fn_t write_entry;

struct directory *bottom;

};

static const struct attr_check *get_archive_attrs(struct index_state *istate,

const char *path)

{

static struct attr_check *check;

if (!check)

check = attr_check_initl("export-ignore", "export-subst", NULL);

git_check_attr(istate, path, check);

return check;

}

static int check_attr_export_ignore(const struct attr_check *check)

{

return check && ATTR_TRUE(check->items[0].value);

}

static int check_attr_export_subst(const struct attr_check *check)

{

return check && ATTR_TRUE(check->items[1].value);

}

static int write_archive_entry(const struct object_id *oid, const char *base,

int baselen, const char *filename, unsigned mode,

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;

int err;

const char *path_without_prefix;

size_t size;

void *buffer;

enum object_type type;

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;

if (!S_ISDIR(mode)) {

const struct attr_check *check;

check = get_archive_attrs(args->repo->index, path_without_prefix);

if (check_attr_export_ignore(check))

return 0;

args->convert = check_attr_export_subst(check);

}

if (args->prefix) {

static struct strbuf new_path = STRBUF_INIT;

static struct strbuf buf = STRBUF_INIT;

const char *rel;

rel = relative_path(path_without_prefix, args->prefix, &buf);

* We don't add an entry for the current working

* directory when we are at the root; skip it also when

* we're in a subdirectory or submodule. Skip entries

* higher up as well.

if (!strcmp(rel, "./") || starts_with(rel, "../"))

return S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0;

/* rel can refer to path, so don't edit it in place */

strbuf_reset(&new_path);

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

strbuf_addstr(&new_path, rel);

strbuf_swap(&path, &new_path);

}

if (args->verbose)

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

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

err = write_entry(args, oid, path.buf, path.len, mode, NULL, 0);

if (err)

return err;

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

}

/* Stream it? */

if (S_ISREG(mode) && !args->convert &&

odb_read_object_info(args->repo->objects, oid, &size) == OBJ_BLOB &&

size > repo_settings_get_big_file_threshold(the_repository))

return write_entry(args, oid, path.buf, path.len, mode, NULL, size);

buffer = object_file_to_archive(args, path.buf, oid, mode, &type, &size);

if (!buffer)

return error(_("cannot read '%s'"), oid_to_hex(oid));

err = write_entry(args, oid, path.buf, path.len, mode, buffer, size);

free(buffer);

return err;

}

static void queue_directory(const struct object_id *oid,

struct strbuf *base, const char *filename,

unsigned mode, struct archiver_context *c)

{

struct directory *d;

size_t len = st_add4(base->len, 1, strlen(filename), 1);

d = xmalloc(st_add(sizeof(*d), len));

d->up = c->bottom;

d->baselen = base->len;

d->mode = mode;

c->bottom = d;

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

oidcpy(&d->oid, oid);

}

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, d->path, d->baselen,

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

c) != READ_TREE_RECURSIVE;

free(d);

return ret ? -1 : 0;

}

static int queue_or_write_archive_entry(const struct object_id *oid,

struct strbuf *base, const char *filename,

unsigned mode, 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)) {

size_t baselen = base->len;

const struct attr_check *check;

/* Borrow base, but restore its original value when done. */

strbuf_addstr(base, filename);

strbuf_addch(base, '/');

check = get_archive_attrs(c->args->repo->index, base->buf);

strbuf_setlen(base, baselen);

if (check_attr_export_ignore(check))

return 0;

queue_directory(oid, base, filename, mode, c);

return READ_TREE_RECURSIVE;

}

if (write_directory(c))

return -1;

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

context);

}

struct extra_file_info {

char *base;

struct stat stat;

void *content;

};

int write_archive_entries(struct archiver_args *args,

write_archive_entry_fn_t write_entry)

{

struct archiver_context context;

int err;

struct strbuf path_in_archive = STRBUF_INIT;

struct strbuf content = STRBUF_INIT;

struct object_id fake_oid;

int i;

oidcpy(&fake_oid, null_oid(the_hash_algo));

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, args->base,

len, 040777, NULL, 0);

if (err)

return err;

}

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

context.args = args;

context.write_entry = write_entry;

err = read_tree(args->repo, args->tree,

&args->pathspec,

queue_or_write_archive_entry,

&context);

if (err == READ_TREE_RECURSIVE)

err = 0;

while (context.bottom) {

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

free(context.bottom);

context.bottom = next;

}

for (i = 0; i < args->extra_files.nr; i++) {

struct string_list_item *item = args->extra_files.items + i;

char *path = item->string;

struct extra_file_info *info = item->util;

put_be64(fake_oid.hash, i + 1);

if (!info->content) {

strbuf_reset(&path_in_archive);

if (info->base)

strbuf_addstr(&path_in_archive, info->base);

strbuf_addstr(&path_in_archive, basename(path));

strbuf_reset(&content);

if (strbuf_read_file(&content, path, info->stat.st_size) < 0)

err = error_errno(_("cannot read '%s'"), path);

else

err = write_entry(args, &fake_oid, path_in_archive.buf,

path_in_archive.len,

canon_mode(info->stat.st_mode),

content.buf, content.len);

} else {

err = write_entry(args, &fake_oid,

path, strlen(path),

canon_mode(info->stat.st_mode),

info->content, info->stat.st_size);

}

if (err)

break;

}

strbuf_release(&path_in_archive);

strbuf_release(&content);

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;

}

struct path_exists_context {

struct pathspec pathspec;

struct archiver_args *args;

};

static int reject_entry(const struct object_id *oid UNUSED,

struct strbuf *base,

const char *filename, unsigned mode,

void *context)

{

int ret = -1;

struct path_exists_context *ctx = context;

if (S_ISDIR(mode)) {

struct strbuf sb = STRBUF_INIT;

strbuf_addbuf(&sb, base);

strbuf_addstr(&sb, filename);

if (!match_pathspec(ctx->args->repo->index,

&ctx->pathspec,

sb.buf, sb.len, 0, NULL, 1))

ret = READ_TREE_RECURSIVE;

strbuf_release(&sb);

}

return ret;

}

static int reject_outside(const struct object_id *oid UNUSED,

struct strbuf *base, const char *filename,

unsigned mode, void *context)

{

struct archiver_args *args = context;

struct strbuf buf = STRBUF_INIT;

struct strbuf path = STRBUF_INIT;

int ret = 0;

if (S_ISDIR(mode))

return READ_TREE_RECURSIVE;

strbuf_addbuf(&path, base);

strbuf_addstr(&path, filename);

if (starts_with(relative_path(path.buf, args->prefix, &buf), "../"))

ret = -1;

strbuf_release(&buf);

strbuf_release(&path);

return ret;

}

static int path_exists(struct archiver_args *args, const char *path)

{

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

struct path_exists_context ctx;

int ret;

ctx.args = args;

parse_pathspec(&ctx.pathspec, 0, PATHSPEC_PREFER_CWD,

args->prefix, paths);

ctx.pathspec.recursive = 1;

if (args->prefix && read_tree(args->repo, args->tree, &ctx.pathspec,

reject_outside, args))

die(_("pathspec '%s' matches files outside the "

"current directory"), path);

ret = read_tree(args->repo, args->tree,

&ctx.pathspec,

reject_entry, &ctx);

clear_pathspec(&ctx.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_CWD,

ar_args->prefix, pathspec);

ar_args->pathspec.recursive = 1;

if (pathspec) {

while (*pathspec) {

if (**pathspec && !path_exists(ar_args, *pathspec))

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

pathspec++;

}

static void parse_treeish_arg(const char **argv,

struct archiver_args *ar_args, int remote)

{

const char *name = argv[0];

const struct object_id *commit_oid;

time_t archive_time;

struct tree *tree;

const struct commit *commit;

struct object_id oid;

char *ref = NULL;

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

if (remote && !remote_allow_unreachable) {

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

int refnamelen = colon - name;

if (!repo_dwim_ref(the_repository, name, refnamelen, &oid, &ref, 0))

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

} else {

repo_dwim_ref(the_repository, name, strlen(name), &oid, &ref,

0);

}

if (repo_get_oid(the_repository, name, &oid))

die(_("not a valid object name: %s"), name);

commit = lookup_commit_reference_gently(ar_args->repo, &oid, 1);

if (commit) {

commit_oid = &commit->object.oid;

archive_time = commit->date;

} else {

commit_oid = NULL;

archive_time = time(NULL);

}

if (ar_args->mtime_option)

archive_time = approxidate(ar_args->mtime_option);

tree = repo_parse_tree_indirect(the_repository, &oid);

if (!tree)

die(_("not a tree object: %s"), oid_to_hex(&oid));

* Setup index and instruct attr to read index only

if (!ar_args->worktree_attributes) {

struct unpack_trees_options opts;

struct tree_desc t;

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

opts.index_only = 1;

opts.head_idx = -1;

opts.src_index = ar_args->repo->index;

opts.dst_index = ar_args->repo->index;

opts.fn = oneway_merge;

init_tree_desc(&t, &tree->object.oid, tree->buffer, tree->size);

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

die(_("failed to unpack tree object %s"),

oid_to_hex(&tree->object.oid));

git_attr_set_direction(GIT_ATTR_INDEX);

}

ar_args->refname = ref;

ar_args->tree = tree;

ar_args->commit_oid = commit_oid;

ar_args->commit = commit;

ar_args->time = archive_time;

}

static void extra_file_info_clear(void *util, const char *str UNUSED)

{

struct extra_file_info *info = util;

free(info->base);

free(info->content);

free(info);

}

static int add_file_cb(const struct option *opt, const char *arg, int unset)

{

struct archiver_args *args = opt->value;

const char **basep = (const char **)opt->defval;

const char *base = *basep;

char *path;

struct string_list_item *item;

struct extra_file_info *info;

if (unset) {

string_list_clear_func(&args->extra_files,

extra_file_info_clear);

return 0;

}

if (!arg)

return -1;

info = xmalloc(sizeof(*info));

info->base = xstrdup_or_null(base);

if (!strcmp(opt->long_name, "add-file")) {

path = prefix_filename(args->prefix, arg);

if (stat(path, &info->stat))

die(_("File not found: %s"), path);

if (!S_ISREG(info->stat.st_mode))

die(_("Not a regular file: %s"), path);

info->content = NULL; /* read the file later */

} else if (!strcmp(opt->long_name, "add-virtual-file")) {

struct strbuf buf = STRBUF_INIT;

const char *p = arg;

if (*p != '"')

p = strchr(p, ':');

else if (unquote_c_style(&buf, p, &p) < 0)

die(_("unclosed quote: '%s'"), arg);

if (!p || *p != ':')

die(_("missing colon: '%s'"), arg);

if (p == arg)

die(_("empty file name: '%s'"), arg);

path = buf.len ?

strbuf_detach(&buf, NULL) : xstrndup(arg, p - arg);

if (args->prefix) {

char *save = path;

path = prefix_filename(args->prefix, path);

free(save);

}

memset(&info->stat, 0, sizeof(info->stat));

info->stat.st_mode = S_IFREG | 0644;

info->content = xstrdup(p + 1);

info->stat.st_size = strlen(info->content);

} else {

BUG("add_file_cb() called for %s", opt->long_name);

}

item = string_list_append_nodup(&args->extra_files, path);

item->util = info;

return 0;

}

static int number_callback(const struct option *opt, const char *arg, int unset)

{

BUG_ON_OPT_NEG(unset);

*(int *)opt->value = strtol(arg, NULL, 10);

return 0;

}

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;

const char *mtime_option = 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")),

{

.type = OPTION_CALLBACK,

.long_name = "add-file",

.value = args,

.argh = N_("file"),

.help = N_("add untracked file to archive"),

.callback = add_file_cb,

.defval = (intptr_t) &base,

{

.type = OPTION_CALLBACK,

.long_name = "add-virtual-file",

.value = args,

.argh = N_("path:content"),

.help = N_("add untracked file to archive"),

.callback = add_file_cb,

.defval = (intptr_t) &base,

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")),

{

.type = OPTION_STRING,

.long_name = "mtime",

.value = &mtime_option,

.argh = N_("time"),

.help = N_("set modification time of archive entries"),

.flags = PARSE_OPT_NONEG,

OPT_NUMBER_CALLBACK(&compression_level,

N_("set compression level"), number_callback),

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(_("the option '%s' requires '%s'"), "--exec", "--remote");

if (output)

die(_("Unexpected option --output"));

if (is_remote && args->extra_files.nr)

die(_("options '%s' and '%s' cannot be used together"), "--add-file", "--remote");

if (!base)

base = "";

if (list) {

if (argc)

die(_("extra command line parameter '%s'"), *argv);

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) {

int levels_ok = (*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS;

int high_ok = (*ar)->flags & ARCHIVER_HIGH_COMPRESSION_LEVELS;

if (levels_ok && (compression_level <= 9 || high_ok))

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;

args->mtime_option = mtime_option;

return argc;

}

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

struct repository *repo,

const char *name_hint, int remote)

{

const struct archiver *ar = NULL;

struct pretty_print_describe_status describe_status = {0};

struct pretty_print_context ctx = {0};

struct archiver_args args;

const char **argv_copy;

int rc;

repo_config_get_bool(the_repository, "uploadarchive.allowunreachable", &remote_allow_unreachable);

repo_config(the_repository, git_default_config, NULL);

describe_status.max_invocations = 1;

ctx.date_mode.type = DATE_NORMAL;

ctx.abbrev = DEFAULT_ABBREV;

ctx.describe_status = &describe_status;

args.pretty_ctx = &ctx;

args.repo = repo;

args.prefix = prefix;

string_list_init_dup(&args.extra_files);

* `parse_archive_args()` modifies contents of `argv`, which is what we

* want. Our callers may not want it though, so we create a copy here.

DUP_ARRAY(argv_copy, argv, argc);

argv = argv_copy;

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

if (!startup_info->have_repository) {

* 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(the_repository);

}

parse_treeish_arg(argv, &args, remote);

parse_pathspec_arg(argv + 1, &args);

rc = ar->write_archive(ar, &args);

string_list_clear_func(&args.extra_files, extra_file_info_clear);

free(args.refname);

clear_pathspec(&args.pathspec);

free(argv_copy);

return rc;

}

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;

}

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