mirror of
https://github.com/git/git.git
synced 2024-11-24 18:33:43 +08:00
358 lines
8.0 KiB
C
358 lines
8.0 KiB
C
/*
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* Copyright (c) 2006 Franck Bui-Huu
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* Copyright (c) 2006 Rene Scharfe
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*/
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#include "cache.h"
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#include "builtin.h"
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#include "archive.h"
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#include "commit.h"
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#include "tree-walk.h"
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#include "exec_cmd.h"
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#include "pkt-line.h"
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#include "sideband.h"
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#include "attr.h"
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static const char archive_usage[] = \
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"git-archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";
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static struct archiver_desc
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{
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const char *name;
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write_archive_fn_t write_archive;
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parse_extra_args_fn_t parse_extra;
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} archivers[] = {
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{ "tar", write_tar_archive, NULL },
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{ "zip", write_zip_archive, parse_extra_zip_args },
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};
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static int run_remote_archiver(const char *remote, int argc,
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const char **argv)
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{
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char *url, buf[LARGE_PACKET_MAX];
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int fd[2], i, len, rv;
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pid_t pid;
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const char *exec = "git-upload-archive";
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int exec_at = 0;
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for (i = 1; i < argc; i++) {
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const char *arg = argv[i];
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if (!prefixcmp(arg, "--exec=")) {
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if (exec_at)
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die("multiple --exec specified");
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exec = arg + 7;
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exec_at = i;
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break;
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}
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}
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url = xstrdup(remote);
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pid = git_connect(fd, url, exec, 0);
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if (pid < 0)
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return pid;
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for (i = 1; i < argc; i++) {
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if (i == exec_at)
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continue;
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packet_write(fd[1], "argument %s\n", argv[i]);
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}
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packet_flush(fd[1]);
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len = packet_read_line(fd[0], buf, sizeof(buf));
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if (!len)
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die("git-archive: expected ACK/NAK, got EOF");
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if (buf[len-1] == '\n')
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buf[--len] = 0;
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if (strcmp(buf, "ACK")) {
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if (len > 5 && !prefixcmp(buf, "NACK "))
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die("git-archive: NACK %s", buf + 5);
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die("git-archive: protocol error");
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}
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len = packet_read_line(fd[0], buf, sizeof(buf));
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if (len)
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die("git-archive: expected a flush");
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/* Now, start reading from fd[0] and spit it out to stdout */
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rv = recv_sideband("archive", fd[0], 1, 2);
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close(fd[0]);
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close(fd[1]);
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rv |= finish_connect(pid);
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return !!rv;
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}
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static void *format_subst(const struct commit *commit, const char *format,
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unsigned long *sizep)
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{
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unsigned long len = *sizep, result_len = 0;
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const char *a = format;
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char *result = NULL;
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for (;;) {
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const char *b, *c;
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char *fmt, *formatted = NULL;
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unsigned long a_len, fmt_len, formatted_len, allocated = 0;
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b = memmem(a, len, "$Format:", 8);
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if (!b || a + len < b + 9)
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break;
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c = memchr(b + 8, '$', len - 8);
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if (!c)
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break;
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a_len = b - a;
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fmt_len = c - b - 8;
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fmt = xmalloc(fmt_len + 1);
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memcpy(fmt, b + 8, fmt_len);
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fmt[fmt_len] = '\0';
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formatted_len = format_commit_message(commit, fmt, &formatted,
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&allocated);
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free(fmt);
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result = xrealloc(result, result_len + a_len + formatted_len);
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memcpy(result + result_len, a, a_len);
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memcpy(result + result_len + a_len, formatted, formatted_len);
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result_len += a_len + formatted_len;
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len -= c + 1 - a;
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a = c + 1;
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}
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if (result && len) {
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result = xrealloc(result, result_len + len);
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memcpy(result + result_len, a, len);
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result_len += len;
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}
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*sizep = result_len;
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return result;
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}
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static void *convert_to_archive(const char *path,
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const void *src, unsigned long *sizep,
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const struct commit *commit)
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{
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static struct git_attr *attr_export_subst;
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struct git_attr_check check[1];
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if (!commit)
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return NULL;
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if (!attr_export_subst)
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attr_export_subst = git_attr("export-subst", 12);
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check[0].attr = attr_export_subst;
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if (git_checkattr(path, ARRAY_SIZE(check), check))
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return NULL;
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if (!ATTR_TRUE(check[0].value))
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return NULL;
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return format_subst(commit, src, sizep);
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}
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void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
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unsigned int mode, enum object_type *type,
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unsigned long *size,
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const struct commit *commit)
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{
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void *buffer, *converted;
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buffer = read_sha1_file(sha1, type, size);
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if (buffer && S_ISREG(mode)) {
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converted = convert_to_working_tree(path, buffer, size);
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if (converted) {
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free(buffer);
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buffer = converted;
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}
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converted = convert_to_archive(path, buffer, size, commit);
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if (converted) {
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free(buffer);
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buffer = converted;
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}
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}
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return buffer;
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}
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static int init_archiver(const char *name, struct archiver *ar)
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{
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int rv = -1, i;
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for (i = 0; i < ARRAY_SIZE(archivers); i++) {
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if (!strcmp(name, archivers[i].name)) {
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memset(ar, 0, sizeof(*ar));
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ar->name = archivers[i].name;
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ar->write_archive = archivers[i].write_archive;
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ar->parse_extra = archivers[i].parse_extra;
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rv = 0;
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break;
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}
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}
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return rv;
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}
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void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
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{
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ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
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}
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void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
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const char *prefix)
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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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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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int parse_archive_args(int argc, const char **argv, struct archiver *ar)
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{
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const char *extra_argv[MAX_EXTRA_ARGS];
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int extra_argc = 0;
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const char *format = "tar";
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const char *base = "";
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int verbose = 0;
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int i;
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for (i = 1; i < argc; i++) {
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const char *arg = argv[i];
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if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
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for (i = 0; i < ARRAY_SIZE(archivers); i++)
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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 (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
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verbose = 1;
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continue;
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}
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if (!prefixcmp(arg, "--format=")) {
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format = arg + 9;
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continue;
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}
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if (!prefixcmp(arg, "--prefix=")) {
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base = arg + 9;
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continue;
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}
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if (!strcmp(arg, "--")) {
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i++;
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break;
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}
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if (arg[0] == '-') {
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if (extra_argc > MAX_EXTRA_ARGS - 1)
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die("Too many extra options");
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extra_argv[extra_argc++] = arg;
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continue;
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}
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break;
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}
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/* We need at least one parameter -- tree-ish */
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if (argc - 1 < i)
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usage(archive_usage);
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if (init_archiver(format, ar) < 0)
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die("Unknown archive format '%s'", format);
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if (extra_argc) {
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if (!ar->parse_extra)
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die("'%s' format does not handle %s",
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ar->name, extra_argv[0]);
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ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
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}
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ar->args.verbose = verbose;
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ar->args.base = base;
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return i;
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}
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static const char *extract_remote_arg(int *ac, const char **av)
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{
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int ix, iy, cnt = *ac;
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int no_more_options = 0;
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const char *remote = NULL;
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for (ix = iy = 1; ix < cnt; ix++) {
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const char *arg = av[ix];
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if (!strcmp(arg, "--"))
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no_more_options = 1;
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if (!no_more_options) {
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if (!prefixcmp(arg, "--remote=")) {
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if (remote)
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die("Multiple --remote specified");
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remote = arg + 9;
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continue;
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}
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if (arg[0] != '-')
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no_more_options = 1;
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}
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if (ix != iy)
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av[iy] = arg;
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iy++;
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}
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if (remote) {
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av[--cnt] = NULL;
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*ac = cnt;
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}
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return remote;
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}
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int cmd_archive(int argc, const char **argv, const char *prefix)
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{
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struct archiver ar;
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int tree_idx;
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const char *remote = NULL;
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remote = extract_remote_arg(&argc, argv);
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if (remote)
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return run_remote_archiver(remote, argc, argv);
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setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
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memset(&ar, 0, sizeof(ar));
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tree_idx = parse_archive_args(argc, argv, &ar);
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if (prefix == NULL)
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prefix = setup_git_directory();
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argv += tree_idx;
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parse_treeish_arg(argv, &ar.args, prefix);
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parse_pathspec_arg(argv + 1, &ar.args);
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return ar.write_archive(&ar.args);
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}
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