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#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
};
static const struct archiver **archivers;
static int nr_archivers;
static int alloc_archivers;
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 = 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 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 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);
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)) {
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);
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);
}
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;
struct pathspec pathspec;
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);
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);
}
init_pathspec(&pathspec, args->pathspec);
err = read_tree_recursive(args->tree, "", 0, 0, &pathspec,
write_archive_entry, &context);
free_pathspec(&pathspec);
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 < nr_archivers; i++) {
if (!strcmp(name, archivers[i]->name))
return archivers[i];
}
return NULL;
}
static int reject_entry(const unsigned char *sha1, const char *base,
int baselen, const char *filename, unsigned mode,
int stage, void *context)
{
return -1;
}
static int path_exists(struct tree *tree, const char *path)
{
const char *paths[] = { path, NULL };
struct pathspec pathspec;
int ret;
init_pathspec(&pathspec, paths);
ret = read_tree_recursive(tree, "", 0, 0, &pathspec, reject_entry, NULL);
free_pathspec(&pathspec);
return ret != 0;
}
static void parse_pathspec_arg(const char **pathspec,
struct archiver_args *ar_args)
{
ar_args->pathspec = pathspec = get_pathspec("", pathspec);
if (pathspec) {
while (*pathspec) {
if (!path_exists(ar_args->tree, *pathspec))
die("path not found: %s", *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;
unsigned char sha1[20];
/* Remotes are only allowed to fetch actual refs */
if (remote) {
char *ref = NULL;
const char *colon = strchr(name, ':');
int refnamelen = colon ? colon - name : strlen(name);
if (!dwim_ref(name, refnamelen, sha1, &ref))
die("no such ref: %.*s", refnamelen, name);
free(ref);
}
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 *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, "fmt", "archive format"),
OPT_STRING(0, "prefix", &base, "prefix",
"prepend prefix to each pathname in the archive"),
OPT_STRING('o', "output", &output, "file",
"write the archive to this file"),
OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
"read .gitattributes in working directory"),
OPT__VERBOSE(&verbose, "report archived files on stderr"),
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_BOOL('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, 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(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;
}
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