Squashed 'third_party/git/' content from commit cb71568594

git-subtree-dir: third_party/git
git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7

1 files changed, 583 insertions, 0 deletions

diff --git a/archive.c b/archive.c
new file mode 100644
index 000000000000..a8da0fcc4f0c
--- /dev/null
+++ b/archive.c
@@ -0,0 +1,583 @@
+#include "cache.h"
+#include "config.h"
+#include "refs.h"
+#include "object-store.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;
+}
+
+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)
+{
+	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 *object_file_to_archive(const struct archiver_args *args,
+			     const char *path, const struct object_id *oid,
+			     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_object_file(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);
+		if (commit)
+			format_subst(commit, buf.buf, buf.len, &buf);
+		buffer = strbuf_detach(&buf, &size);
+		*sizep = size;
+	}
+
+	return buffer;
+}
+
+struct directory {
+	struct directory *up;
+	struct object_id oid;
+	int baselen, len;
+	unsigned mode;
+	int stage;
+	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, 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;
+	int err;
+	const char *path_without_prefix;
+
+	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 (S_ISDIR(mode) || S_ISGITLINK(mode)) {
+		if (args->verbose)
+			fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
+		err = write_entry(args, oid, 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, oid, path.buf, path.len, mode);
+}
+
+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 = 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;
+	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, 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 struct object_id *oid,
+		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)) {
+		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->hash, base, filename,
+				mode, stage, c);
+		return READ_TREE_RECURSIVE;
+	}
+
+	if (write_directory(c))
+		return -1;
+	return write_archive_entry(oid, 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, 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 = args->repo->index;
+		opts.dst_index = args->repo->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);
+	}
+
+	err = read_tree_recursive(args->repo, args->tree, "",
+				  0, 0, &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;
+	}
+	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, struct strbuf *base,
+			const char *filename, unsigned mode,
+			int stage, 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 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, 0, "", paths);
+	ctx.pathspec.recursive = 1;
+	ret = read_tree_recursive(args->repo, args->tree, "",
+				  0, 0, &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_FULL,
+		       "", 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, const char *prefix,
+		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;
+
+	/* 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, &ref))
+			die(_("no such ref: %.*s"), refnamelen, name);
+		free(ref);
+	}
+
+	if (get_oid(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);
+	}
+
+	tree = parse_tree_indirect(&oid);
+	if (tree == NULL)
+		die(_("not a tree object: %s"), oid_to_hex(&oid));
+
+	if (prefix) {
+		struct object_id tree_oid;
+		unsigned short mode;
+		int err;
+
+		err = get_tree_entry(ar_args->repo,
+				     &tree->object.oid,
+				     prefix, &tree_oid,
+				     &mode);
+		if (err || !S_ISDIR(mode))
+			die(_("current working directory is untracked"));
+
+		tree = parse_tree_indirect(&tree_oid);
+	}
+	ar_args->tree = tree;
+	ar_args->commit_oid = commit_oid;
+	ar_args->commit = commit;
+	ar_args->time = archive_time;
+}
+
+#define OPT__COMPR(s, v, h, p) \
+	OPT_SET_INT_F(s, NULL, v, h, p, PARSE_OPT_NONEG)
+#define OPT__COMPR_HIDDEN(s, v, p) \
+	OPT_SET_INT_F(s, NULL, v, "", p, PARSE_OPT_NONEG | PARSE_OPT_HIDDEN)
+
+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,
+		  struct repository *repo,
+		  const char *name_hint, int remote)
+{
+	const struct archiver *ar = NULL;
+	struct archiver_args args;
+
+	git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
+	git_config(git_default_config, NULL);
+
+	args.repo = repo;
+	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();
+	}
+
+	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;
+}