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https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
By René Scharfe * rs/archive-tree-in-tip-simplify: archive-tar: keep const in checksum calculation archive: simplify refname handling
452 lines
12 KiB
C
452 lines
12 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "tree-walk.h"
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#include "attr.h"
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#include "archive.h"
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#include "parse-options.h"
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#include "unpack-trees.h"
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static char const * const archive_usage[] = {
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"git archive [options] <tree-ish> [<path>...]",
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"git archive --list",
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"git archive --remote <repo> [--exec <cmd>] [options] <tree-ish> [<path>...]",
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"git archive --remote <repo> [--exec <cmd>] --list",
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NULL
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};
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static const struct archiver **archivers;
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static int nr_archivers;
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static int alloc_archivers;
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void register_archiver(struct archiver *ar)
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{
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ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
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archivers[nr_archivers++] = ar;
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}
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static void format_subst(const struct commit *commit,
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const char *src, size_t len,
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struct strbuf *buf)
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{
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char *to_free = NULL;
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struct strbuf fmt = STRBUF_INIT;
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struct pretty_print_context ctx = {0};
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ctx.date_mode = DATE_NORMAL;
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ctx.abbrev = DEFAULT_ABBREV;
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if (src == buf->buf)
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to_free = strbuf_detach(buf, NULL);
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for (;;) {
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const char *b, *c;
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b = memmem(src, len, "$Format:", 8);
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if (!b)
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break;
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c = memchr(b + 8, '$', (src + len) - b - 8);
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if (!c)
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break;
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strbuf_reset(&fmt);
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strbuf_add(&fmt, b + 8, c - b - 8);
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strbuf_add(buf, src, b - src);
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format_commit_message(commit, fmt.buf, buf, &ctx);
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len -= c + 1 - src;
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src = c + 1;
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}
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strbuf_add(buf, src, len);
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strbuf_release(&fmt);
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free(to_free);
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}
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void *sha1_file_to_archive(const struct archiver_args *args,
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const char *path, const unsigned char *sha1,
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unsigned int mode, enum object_type *type,
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unsigned long *sizep)
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{
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void *buffer;
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const struct commit *commit = args->convert ? args->commit : NULL;
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path += args->baselen;
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buffer = read_sha1_file(sha1, type, sizep);
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if (buffer && S_ISREG(mode)) {
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struct strbuf buf = STRBUF_INIT;
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size_t size = 0;
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strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
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convert_to_working_tree(path, buf.buf, buf.len, &buf);
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if (commit)
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format_subst(commit, buf.buf, buf.len, &buf);
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buffer = strbuf_detach(&buf, &size);
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*sizep = size;
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}
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return buffer;
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}
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static void setup_archive_check(struct git_attr_check *check)
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{
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static struct git_attr *attr_export_ignore;
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static struct git_attr *attr_export_subst;
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if (!attr_export_ignore) {
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attr_export_ignore = git_attr("export-ignore");
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attr_export_subst = git_attr("export-subst");
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}
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check[0].attr = attr_export_ignore;
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check[1].attr = attr_export_subst;
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}
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struct archiver_context {
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struct archiver_args *args;
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write_archive_entry_fn_t write_entry;
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};
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static int write_archive_entry(const unsigned char *sha1, const char *base,
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int baselen, const char *filename, unsigned mode, int stage,
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void *context)
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{
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static struct strbuf path = STRBUF_INIT;
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struct archiver_context *c = context;
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struct archiver_args *args = c->args;
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write_archive_entry_fn_t write_entry = c->write_entry;
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struct git_attr_check check[2];
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const char *path_without_prefix;
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int err;
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args->convert = 0;
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strbuf_reset(&path);
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strbuf_grow(&path, PATH_MAX);
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strbuf_add(&path, args->base, args->baselen);
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strbuf_add(&path, base, baselen);
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strbuf_addstr(&path, filename);
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path_without_prefix = path.buf + args->baselen;
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setup_archive_check(check);
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if (!git_check_attr(path_without_prefix, ARRAY_SIZE(check), check)) {
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if (ATTR_TRUE(check[0].value))
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return 0;
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args->convert = ATTR_TRUE(check[1].value);
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}
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if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
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strbuf_addch(&path, '/');
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if (args->verbose)
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fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
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err = write_entry(args, sha1, path.buf, path.len, mode);
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if (err)
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return err;
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return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
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}
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if (args->verbose)
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fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
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return write_entry(args, sha1, path.buf, path.len, mode);
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}
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int write_archive_entries(struct archiver_args *args,
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write_archive_entry_fn_t write_entry)
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{
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struct archiver_context context;
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struct unpack_trees_options opts;
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struct tree_desc t;
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struct pathspec pathspec;
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int err;
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if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
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size_t len = args->baselen;
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while (len > 1 && args->base[len - 2] == '/')
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len--;
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if (args->verbose)
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fprintf(stderr, "%.*s\n", (int)len, args->base);
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err = write_entry(args, args->tree->object.sha1, args->base,
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len, 040777);
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if (err)
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return err;
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}
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context.args = args;
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context.write_entry = write_entry;
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/*
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* Setup index and instruct attr to read index only
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*/
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if (!args->worktree_attributes) {
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memset(&opts, 0, sizeof(opts));
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opts.index_only = 1;
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opts.head_idx = -1;
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opts.src_index = &the_index;
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opts.dst_index = &the_index;
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opts.fn = oneway_merge;
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init_tree_desc(&t, args->tree->buffer, args->tree->size);
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if (unpack_trees(1, &t, &opts))
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return -1;
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git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
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}
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init_pathspec(&pathspec, args->pathspec);
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err = read_tree_recursive(args->tree, "", 0, 0, &pathspec,
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write_archive_entry, &context);
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free_pathspec(&pathspec);
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if (err == READ_TREE_RECURSIVE)
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err = 0;
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return err;
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}
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static const struct archiver *lookup_archiver(const char *name)
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{
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int i;
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if (!name)
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return NULL;
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for (i = 0; i < nr_archivers; i++) {
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if (!strcmp(name, archivers[i]->name))
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return archivers[i];
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}
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return NULL;
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}
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static int reject_entry(const unsigned char *sha1, const char *base,
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int baselen, const char *filename, unsigned mode,
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int stage, void *context)
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{
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return -1;
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}
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static int path_exists(struct tree *tree, const char *path)
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{
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const char *paths[] = { path, NULL };
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struct pathspec pathspec;
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int ret;
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init_pathspec(&pathspec, paths);
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ret = read_tree_recursive(tree, "", 0, 0, &pathspec, reject_entry, NULL);
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free_pathspec(&pathspec);
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return ret != 0;
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}
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static void parse_pathspec_arg(const char **pathspec,
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struct archiver_args *ar_args)
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{
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ar_args->pathspec = pathspec = get_pathspec("", pathspec);
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if (pathspec) {
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while (*pathspec) {
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if (!path_exists(ar_args->tree, *pathspec))
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die("path not found: %s", *pathspec);
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pathspec++;
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}
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}
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}
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static void parse_treeish_arg(const char **argv,
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struct archiver_args *ar_args, const char *prefix,
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int remote)
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{
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const char *name = argv[0];
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const unsigned char *commit_sha1;
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time_t archive_time;
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struct tree *tree;
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const struct commit *commit;
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unsigned char sha1[20];
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/* Remotes are only allowed to fetch actual refs */
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if (remote) {
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char *ref = NULL;
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const char *colon = strchr(name, ':');
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int refnamelen = colon ? colon - name : strlen(name);
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if (!dwim_ref(name, refnamelen, sha1, &ref))
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die("no such ref: %.*s", refnamelen, name);
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free(ref);
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}
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if (get_sha1(name, sha1))
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die("Not a valid object name");
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commit = lookup_commit_reference_gently(sha1, 1);
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if (commit) {
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commit_sha1 = commit->object.sha1;
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archive_time = commit->date;
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} else {
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commit_sha1 = NULL;
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archive_time = time(NULL);
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}
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tree = parse_tree_indirect(sha1);
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if (tree == NULL)
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die("not a tree object");
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if (prefix) {
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unsigned char tree_sha1[20];
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unsigned int mode;
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int err;
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err = get_tree_entry(tree->object.sha1, prefix,
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tree_sha1, &mode);
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if (err || !S_ISDIR(mode))
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die("current working directory is untracked");
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tree = parse_tree_indirect(tree_sha1);
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}
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ar_args->tree = tree;
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ar_args->commit_sha1 = commit_sha1;
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ar_args->commit = commit;
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ar_args->time = archive_time;
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}
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#define OPT__COMPR(s, v, h, p) \
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{ OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
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PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
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#define OPT__COMPR_HIDDEN(s, v, p) \
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{ OPTION_SET_INT, (s), NULL, (v), NULL, "", \
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PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
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static int parse_archive_args(int argc, const char **argv,
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const struct archiver **ar, struct archiver_args *args,
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const char *name_hint, int is_remote)
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{
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const char *format = NULL;
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const char *base = NULL;
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const char *remote = NULL;
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const char *exec = NULL;
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const char *output = NULL;
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int compression_level = -1;
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int verbose = 0;
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int i;
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int list = 0;
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int worktree_attributes = 0;
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struct option opts[] = {
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OPT_GROUP(""),
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OPT_STRING(0, "format", &format, "fmt", "archive format"),
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OPT_STRING(0, "prefix", &base, "prefix",
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"prepend prefix to each pathname in the archive"),
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OPT_STRING('o', "output", &output, "file",
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"write the archive to this file"),
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OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
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"read .gitattributes in working directory"),
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OPT__VERBOSE(&verbose, "report archived files on stderr"),
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OPT__COMPR('0', &compression_level, "store only", 0),
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OPT__COMPR('1', &compression_level, "compress faster", 1),
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OPT__COMPR_HIDDEN('2', &compression_level, 2),
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OPT__COMPR_HIDDEN('3', &compression_level, 3),
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OPT__COMPR_HIDDEN('4', &compression_level, 4),
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OPT__COMPR_HIDDEN('5', &compression_level, 5),
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OPT__COMPR_HIDDEN('6', &compression_level, 6),
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OPT__COMPR_HIDDEN('7', &compression_level, 7),
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OPT__COMPR_HIDDEN('8', &compression_level, 8),
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OPT__COMPR('9', &compression_level, "compress better", 9),
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OPT_GROUP(""),
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OPT_BOOL('l', "list", &list,
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"list supported archive formats"),
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OPT_GROUP(""),
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OPT_STRING(0, "remote", &remote, "repo",
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"retrieve the archive from remote repository <repo>"),
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OPT_STRING(0, "exec", &exec, "cmd",
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"path to the remote git-upload-archive command"),
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OPT_END()
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};
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argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
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if (remote)
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die("Unexpected option --remote");
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if (exec)
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die("Option --exec can only be used together with --remote");
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if (output)
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die("Unexpected option --output");
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if (!base)
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base = "";
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if (list) {
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for (i = 0; i < nr_archivers; i++)
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if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
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printf("%s\n", archivers[i]->name);
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exit(0);
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}
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if (!format && name_hint)
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format = archive_format_from_filename(name_hint);
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if (!format)
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format = "tar";
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/* We need at least one parameter -- tree-ish */
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if (argc < 1)
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usage_with_options(archive_usage, opts);
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*ar = lookup_archiver(format);
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if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
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die("Unknown archive format '%s'", format);
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args->compression_level = Z_DEFAULT_COMPRESSION;
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if (compression_level != -1) {
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if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
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args->compression_level = compression_level;
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else {
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die("Argument not supported for format '%s': -%d",
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format, compression_level);
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}
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}
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args->verbose = verbose;
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args->base = base;
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args->baselen = strlen(base);
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args->worktree_attributes = worktree_attributes;
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return argc;
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}
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int write_archive(int argc, const char **argv, const char *prefix,
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int setup_prefix, const char *name_hint, int remote)
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{
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int nongit = 0;
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const struct archiver *ar = NULL;
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struct archiver_args args;
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if (setup_prefix && prefix == NULL)
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prefix = setup_git_directory_gently(&nongit);
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git_config(git_default_config, NULL);
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init_tar_archiver();
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init_zip_archiver();
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argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
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if (nongit) {
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/*
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* We know this will die() with an error, so we could just
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* die ourselves; but its error message will be more specific
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* than what we could write here.
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*/
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setup_git_directory();
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}
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parse_treeish_arg(argv, &args, prefix, remote);
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parse_pathspec_arg(argv + 1, &args);
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return ar->write_archive(ar, &args);
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}
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static int match_extension(const char *filename, const char *ext)
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{
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int prefixlen = strlen(filename) - strlen(ext);
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/*
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* We need 1 character for the '.', and 1 character to ensure that the
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* prefix is non-empty (k.e., we don't match .tar.gz with no actual
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* filename).
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*/
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if (prefixlen < 2 || filename[prefixlen-1] != '.')
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return 0;
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return !strcmp(filename + prefixlen, ext);
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}
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const char *archive_format_from_filename(const char *filename)
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{
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int i;
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for (i = 0; i < nr_archivers; i++)
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if (match_extension(filename, archivers[i]->name))
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return archivers[i]->name;
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return NULL;
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}
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