mirror of
https://github.com/git/git
synced 2024-10-30 14:03:28 +00:00
8098a178b2
This adds the counterpart of git-update-ref that lets you read and create "symbolic refs". By default it uses a symbolic link to represent ".git/HEAD -> refs/heads/master", but it can be compiled to use the textfile symbolic ref. The places that did 'readlink .git/HEAD' and 'ln -s refs/heads/blah .git/HEAD' have been converted to use new git-symbolic-ref command, so that they can deal with either implementation. Signed-off-by: Junio C Hamano <junio@twinsun.com>
256 lines
6 KiB
C
256 lines
6 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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*/
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#include "cache.h"
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#ifndef DEFAULT_GIT_TEMPLATE_DIR
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#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates/"
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#endif
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static void safe_create_dir(const char *dir)
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{
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if (mkdir(dir, 0777) < 0) {
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if (errno != EEXIST) {
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perror(dir);
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exit(1);
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}
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}
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}
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static int copy_file(const char *dst, const char *src, int mode)
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{
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int fdi, fdo;
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mode = (mode & 0111) ? 0777 : 0666;
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if ((fdi = open(src, O_RDONLY)) < 0)
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return fdi;
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if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
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close(fdi);
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return fdo;
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}
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while (1) {
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char buf[BUFSIZ];
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ssize_t leni, leno, ofs;
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leni = read(fdi, buf, sizeof(buf));
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if (leni < 0) {
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error_return:
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close(fdo);
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close(fdi);
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return -1;
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}
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if (!leni)
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break;
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ofs = 0;
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do {
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leno = write(fdo, buf+ofs, leni);
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if (leno < 0)
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goto error_return;
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leni -= leno;
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ofs += leno;
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} while (0 < leni);
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}
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close(fdo);
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close(fdi);
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return 0;
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}
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static void copy_templates_1(char *path, int baselen,
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char *template, int template_baselen,
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DIR *dir)
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{
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struct dirent *de;
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/* Note: if ".git/hooks" file exists in the repository being
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* re-initialized, /etc/core-git/templates/hooks/update would
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* cause git-init-db to fail here. I think this is sane but
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* it means that the set of templates we ship by default, along
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* with the way the namespace under .git/ is organized, should
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* be really carefully chosen.
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*/
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safe_create_dir(path);
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while ((de = readdir(dir)) != NULL) {
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struct stat st_git, st_template;
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int namelen;
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int exists = 0;
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if (de->d_name[0] == '.')
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continue;
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namelen = strlen(de->d_name);
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if ((PATH_MAX <= baselen + namelen) ||
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(PATH_MAX <= template_baselen + namelen))
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die("insanely long template name %s", de->d_name);
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memcpy(path + baselen, de->d_name, namelen+1);
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memcpy(template + template_baselen, de->d_name, namelen+1);
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if (lstat(path, &st_git)) {
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if (errno != ENOENT)
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die("cannot stat %s", path);
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}
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else
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exists = 1;
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if (lstat(template, &st_template))
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die("cannot stat template %s", template);
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if (S_ISDIR(st_template.st_mode)) {
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DIR *subdir = opendir(template);
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int baselen_sub = baselen + namelen;
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int template_baselen_sub = template_baselen + namelen;
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if (!subdir)
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die("cannot opendir %s", template);
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path[baselen_sub++] =
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template[template_baselen_sub++] = '/';
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path[baselen_sub] =
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template[template_baselen_sub] = 0;
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copy_templates_1(path, baselen_sub,
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template, template_baselen_sub,
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subdir);
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closedir(subdir);
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}
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else if (exists)
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continue;
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else if (S_ISLNK(st_template.st_mode)) {
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char lnk[256];
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int len;
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len = readlink(template, lnk, sizeof(lnk));
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if (len < 0)
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die("cannot readlink %s", template);
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if (sizeof(lnk) <= len)
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die("insanely long symlink %s", template);
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lnk[len] = 0;
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if (symlink(lnk, path))
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die("cannot symlink %s %s", lnk, path);
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}
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else if (S_ISREG(st_template.st_mode)) {
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if (copy_file(path, template, st_template.st_mode))
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die("cannot copy %s to %s", template, path);
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}
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else
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error("ignoring template %s", template);
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}
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}
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static void copy_templates(const char *git_dir, int len, char *template_dir)
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{
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char path[PATH_MAX];
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char template_path[PATH_MAX];
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int template_len;
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DIR *dir;
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if (!template_dir)
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template_dir = DEFAULT_GIT_TEMPLATE_DIR;
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strcpy(template_path, template_dir);
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template_len = strlen(template_path);
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if (template_path[template_len-1] != '/') {
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template_path[template_len++] = '/';
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template_path[template_len] = 0;
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}
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dir = opendir(template_path);
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if (!dir) {
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fprintf(stderr, "warning: templates not found %s\n",
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template_dir);
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return;
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}
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memcpy(path, git_dir, len);
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path[len] = 0;
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copy_templates_1(path, len,
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template_path, template_len,
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dir);
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closedir(dir);
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}
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static void create_default_files(const char *git_dir,
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char *template_path)
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{
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unsigned len = strlen(git_dir);
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static char path[PATH_MAX];
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unsigned char sha1[20];
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if (len > sizeof(path)-50)
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die("insane git directory %s", git_dir);
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memcpy(path, git_dir, len);
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if (len && path[len-1] != '/')
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path[len++] = '/';
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/*
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* Create .git/refs/{heads,tags}
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*/
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strcpy(path + len, "refs");
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safe_create_dir(path);
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strcpy(path + len, "refs/heads");
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safe_create_dir(path);
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strcpy(path + len, "refs/tags");
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safe_create_dir(path);
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/*
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* Create the default symlink from ".git/HEAD" to the "master"
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* branch, if it does not exist yet.
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*/
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strcpy(path + len, "HEAD");
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if (read_ref(path, sha1) < 0) {
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if (create_symref(path, "refs/heads/master") < 0)
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exit(1);
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}
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path[len] = 0;
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copy_templates(path, len, template_path);
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}
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static const char init_db_usage[] =
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"git-init-db [--template=<template-directory>]";
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/*
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* If you want to, you can share the DB area with any number of branches.
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* That has advantages: you can save space by sharing all the SHA1 objects.
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* On the other hand, it might just make lookup slower and messier. You
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* be the judge. The default case is to have one DB per managed directory.
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*/
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int main(int argc, char **argv)
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{
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const char *git_dir;
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const char *sha1_dir;
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char *path, *template_dir = NULL;
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int len, i;
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for (i = 1; i < argc; i++, argv++) {
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char *arg = argv[1];
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if (arg[0] != '-')
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break;
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else if (!strncmp(arg, "--template=", 11))
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template_dir = arg+11;
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else
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die(init_db_usage);
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}
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/*
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* Set up the default .git directory contents
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*/
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git_dir = getenv(GIT_DIR_ENVIRONMENT);
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if (!git_dir) {
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git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
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fprintf(stderr, "defaulting to local storage area\n");
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}
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safe_create_dir(git_dir);
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create_default_files(git_dir, template_dir);
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/*
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* And set up the object store.
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*/
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sha1_dir = get_object_directory();
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len = strlen(sha1_dir);
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path = xmalloc(len + 40);
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memcpy(path, sha1_dir, len);
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safe_create_dir(sha1_dir);
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for (i = 0; i < 256; i++) {
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sprintf(path+len, "/%02x", i);
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safe_create_dir(path);
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}
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strcpy(path+len, "/pack");
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safe_create_dir(path);
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strcpy(path+len, "/info");
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safe_create_dir(path);
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return 0;
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}
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