зеркало из https://github.com/microsoft/git.git
262 строки
6.1 KiB
C
262 строки
6.1 KiB
C
/*
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* Copyright (C) 2005 Junio C Hamano
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*/
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#include "cache.h"
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#include "commit.h"
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#include "fetch.h"
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static int use_link = 0;
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static int use_symlink = 0;
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static int use_filecopy = 1;
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static int commits_on_stdin = 0;
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static const char *path; /* "Remote" git repository */
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void prefetch(unsigned char *sha1)
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{
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}
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static struct packed_git *packs = NULL;
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static void setup_index(unsigned char *sha1)
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{
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struct packed_git *new_pack;
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char filename[PATH_MAX];
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strcpy(filename, path);
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strcat(filename, "/objects/pack/pack-");
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strcat(filename, sha1_to_hex(sha1));
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strcat(filename, ".idx");
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new_pack = parse_pack_index_file(sha1, filename);
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new_pack->next = packs;
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packs = new_pack;
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}
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static int setup_indices(void)
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{
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DIR *dir;
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struct dirent *de;
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char filename[PATH_MAX];
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unsigned char sha1[20];
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sprintf(filename, "%s/objects/pack/", path);
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dir = opendir(filename);
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if (!dir)
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return -1;
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while ((de = readdir(dir)) != NULL) {
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int namelen = strlen(de->d_name);
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if (namelen != 50 ||
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strcmp(de->d_name + namelen - 5, ".pack"))
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continue;
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get_sha1_hex(de->d_name + 5, sha1);
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setup_index(sha1);
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}
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closedir(dir);
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return 0;
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}
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static int copy_file(const char *source, char *dest, const char *hex,
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int warn_if_not_exists)
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{
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safe_create_leading_directories(dest);
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if (use_link) {
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if (!link(source, dest)) {
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pull_say("link %s\n", hex);
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return 0;
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}
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/* If we got ENOENT there is no point continuing. */
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if (errno == ENOENT) {
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if (warn_if_not_exists)
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fprintf(stderr, "does not exist %s\n", source);
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return -1;
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}
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}
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if (use_symlink) {
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struct stat st;
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if (stat(source, &st)) {
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if (!warn_if_not_exists && errno == ENOENT)
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return -1;
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fprintf(stderr, "cannot stat %s: %s\n", source,
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strerror(errno));
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return -1;
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}
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if (!symlink(source, dest)) {
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pull_say("symlink %s\n", hex);
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return 0;
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}
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}
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if (use_filecopy) {
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int ifd, ofd, status = 0;
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ifd = open(source, O_RDONLY);
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if (ifd < 0) {
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if (!warn_if_not_exists && errno == ENOENT)
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return -1;
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fprintf(stderr, "cannot open %s\n", source);
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return -1;
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}
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ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
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if (ofd < 0) {
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fprintf(stderr, "cannot open %s\n", dest);
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close(ifd);
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return -1;
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}
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status = copy_fd(ifd, ofd);
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close(ofd);
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if (status)
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fprintf(stderr, "cannot write %s\n", dest);
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else
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pull_say("copy %s\n", hex);
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return status;
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}
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fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
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return -1;
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}
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static int fetch_pack(const unsigned char *sha1)
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{
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struct packed_git *target;
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char filename[PATH_MAX];
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if (setup_indices())
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return -1;
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target = find_sha1_pack(sha1, packs);
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if (!target)
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return error("Couldn't find %s: not separate or in any pack",
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sha1_to_hex(sha1));
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if (get_verbosely) {
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fprintf(stderr, "Getting pack %s\n",
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sha1_to_hex(target->sha1));
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fprintf(stderr, " which contains %s\n",
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sha1_to_hex(sha1));
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}
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sprintf(filename, "%s/objects/pack/pack-%s.pack",
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path, sha1_to_hex(target->sha1));
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copy_file(filename, sha1_pack_name(target->sha1),
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sha1_to_hex(target->sha1), 1);
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sprintf(filename, "%s/objects/pack/pack-%s.idx",
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path, sha1_to_hex(target->sha1));
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copy_file(filename, sha1_pack_index_name(target->sha1),
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sha1_to_hex(target->sha1), 1);
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install_packed_git(target);
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return 0;
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}
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static int fetch_file(const unsigned char *sha1)
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{
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static int object_name_start = -1;
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static char filename[PATH_MAX];
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char *hex = sha1_to_hex(sha1);
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char *dest_filename = sha1_file_name(sha1);
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if (object_name_start < 0) {
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strcpy(filename, path); /* e.g. git.git */
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strcat(filename, "/objects/");
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object_name_start = strlen(filename);
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}
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filename[object_name_start+0] = hex[0];
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filename[object_name_start+1] = hex[1];
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filename[object_name_start+2] = '/';
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strcpy(filename + object_name_start + 3, hex + 2);
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return copy_file(filename, dest_filename, hex, 0);
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}
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int fetch(unsigned char *sha1)
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{
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if (has_sha1_file(sha1))
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return 0;
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else
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return fetch_file(sha1) && fetch_pack(sha1);
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}
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int fetch_ref(char *ref, unsigned char *sha1)
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{
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static int ref_name_start = -1;
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static char filename[PATH_MAX];
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static char hex[41];
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int ifd;
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if (ref_name_start < 0) {
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sprintf(filename, "%s/refs/", path);
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ref_name_start = strlen(filename);
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}
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strcpy(filename + ref_name_start, ref);
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ifd = open(filename, O_RDONLY);
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if (ifd < 0) {
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close(ifd);
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fprintf(stderr, "cannot open %s\n", filename);
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return -1;
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}
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if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
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close(ifd);
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fprintf(stderr, "cannot read from %s\n", filename);
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return -1;
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}
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close(ifd);
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pull_say("ref %s\n", sha1_to_hex(sha1));
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return 0;
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}
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static const char local_pull_usage[] =
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"git-local-fetch [-c] [-t] [-a] [-v] [-w filename] [--recover] [-l] [-s] [-n] [--stdin] commit-id path";
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/*
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* By default we only use file copy.
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* If -l is specified, a hard link is attempted.
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* If -s is specified, then a symlink is attempted.
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* If -n is _not_ specified, then a regular file-to-file copy is done.
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*/
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int main(int argc, const char **argv)
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{
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int commits;
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const char **write_ref = NULL;
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char **commit_id;
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int arg = 1;
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setup_git_directory();
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git_config(git_default_config);
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while (arg < argc && argv[arg][0] == '-') {
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if (argv[arg][1] == 't')
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get_tree = 1;
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else if (argv[arg][1] == 'c')
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get_history = 1;
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else if (argv[arg][1] == 'a') {
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get_all = 1;
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get_tree = 1;
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get_history = 1;
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}
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else if (argv[arg][1] == 'l')
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use_link = 1;
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else if (argv[arg][1] == 's')
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use_symlink = 1;
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else if (argv[arg][1] == 'n')
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use_filecopy = 0;
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else if (argv[arg][1] == 'v')
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get_verbosely = 1;
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else if (argv[arg][1] == 'w')
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write_ref = &argv[++arg];
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else if (!strcmp(argv[arg], "--recover"))
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get_recover = 1;
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else if (!strcmp(argv[arg], "--stdin"))
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commits_on_stdin = 1;
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else
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usage(local_pull_usage);
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arg++;
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}
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if (argc < arg + 2 - commits_on_stdin)
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usage(local_pull_usage);
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if (commits_on_stdin) {
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commits = pull_targets_stdin(&commit_id, &write_ref);
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} else {
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commit_id = (char **) &argv[arg++];
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commits = 1;
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}
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path = argv[arg];
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if (pull(commits, commit_id, write_ref, path))
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return 1;
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if (commits_on_stdin)
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pull_targets_free(commits, commit_id, write_ref);
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return 0;
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}
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