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/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
static void safe_create_dir(const char *dir)
{
if (mkdir(dir, 0777) < 0) {
if (errno != EEXIST) {
perror(dir);
exit(1);
}
}
}
static int copy_file(const char *dst, const char *src, int mode)
{
int fdi, fdo;
mode = (mode & 0111) ? 0777 : 0666;
if ((fdi = open(src, O_RDONLY)) < 0)
return fdi;
if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
close(fdi);
return fdo;
}
while (1) {
char buf[BUFSIZ];
ssize_t leni, leno, ofs;
leni = read(fdi, buf, sizeof(buf));
if (leni < 0) {
error_return:
close(fdo);
close(fdi);
return -1;
}
if (!leni)
break;
ofs = 0;
do {
leno = write(fdo, buf+ofs, leni);
if (leno < 0)
goto error_return;
leni -= leno;
ofs += leno;
} while (0 < leni);
}
close(fdo);
close(fdi);
return 0;
}
static void copy_templates_1(char *path, int baselen,
char *template, int template_baselen,
DIR *dir)
{
struct dirent *de;
/* Note: if ".git/hooks" file exists in the repository being
* re-initialized, /etc/core-git/templates/hooks/update would
* cause git-init-db to fail here. I think this is sane but
* it means that the set of templates we ship by default, along
* with the way the namespace under .git/ is organized, should
* be really carefully chosen.
*/
safe_create_dir(path);
while ((de = readdir(dir)) != NULL) {
struct stat st_git, st_template;
int namelen;
int exists = 0;
if (de->d_name[0] == '.')
continue;
namelen = strlen(de->d_name);
if ((PATH_MAX <= baselen + namelen) ||
(PATH_MAX <= template_baselen + namelen))
die("insanely long template name %s", de->d_name);
memcpy(path + baselen, de->d_name, namelen+1);
memcpy(template + template_baselen, de->d_name, namelen+1);
if (lstat(path, &st_git)) {
if (errno != ENOENT)
die("cannot stat %s", path);
}
else
exists = 1;
if (lstat(template, &st_template))
die("cannot stat template %s", template);
if (S_ISDIR(st_template.st_mode)) {
DIR *subdir = opendir(template);
int baselen_sub = baselen + namelen;
int template_baselen_sub = template_baselen + namelen;
if (!subdir)
die("cannot opendir %s", template);
path[baselen_sub++] =
template[template_baselen_sub++] = '/';
path[baselen_sub] =
template[template_baselen_sub] = 0;
copy_templates_1(path, baselen_sub,
template, template_baselen_sub,
subdir);
closedir(subdir);
}
else if (exists)
continue;
else if (S_ISLNK(st_template.st_mode)) {
char lnk[256];
int len;
len = readlink(template, lnk, sizeof(lnk));
if (len < 0)
die("cannot readlink %s", template);
if (sizeof(lnk) <= len)
die("insanely long symlink %s", template);
lnk[len] = 0;
if (symlink(lnk, path))
die("cannot symlink %s %s", lnk, path);
}
else if (S_ISREG(st_template.st_mode)) {
if (copy_file(path, template, st_template.st_mode))
die("cannot copy %s to %s", template, path);
}
else
error("ignoring template %s", template);
}
}
static void copy_templates(const char *git_dir)
{
char path[PATH_MAX];
char template_path[PATH_MAX];
char *template_dir;
int len, template_len;
DIR *dir;
strcpy(path, git_dir);
len = strlen(path);
template_dir = gitenv(TEMPLATE_DIR_ENVIRONMENT);
if (!template_dir)
template_dir = DEFAULT_GIT_TEMPLATE_ENVIRONMENT;
strcpy(template_path, template_dir);
template_len = strlen(template_path);
if (template_path[template_len-1] != '/') {
template_path[template_len++] = '/';
template_path[template_len] = 0;
}
dir = opendir(template_path);
if (!dir)
return;
copy_templates_1(path, len,
template_path, template_len,
dir);
closedir(dir);
}
static void create_default_files(const char *git_dir)
{
unsigned len = strlen(git_dir);
static char path[PATH_MAX];
if (len > sizeof(path)-50)
die("insane git directory %s", git_dir);
memcpy(path, git_dir, len);
if (len && path[len-1] != '/')
path[len++] = '/';
/*
* Create .git/refs/{heads,tags}
*/
strcpy(path + len, "refs");
safe_create_dir(path);
strcpy(path + len, "refs/heads");
safe_create_dir(path);
strcpy(path + len, "refs/tags");
safe_create_dir(path);
/*
* Create the default symlink from ".git/HEAD" to the "master"
* branch
*/
strcpy(path + len, "HEAD");
if (symlink("refs/heads/master", path) < 0) {
if (errno != EEXIST) {
perror(path);
exit(1);
}
}
path[len] = 0;
copy_templates(path);
}
/*
* If you want to, you can share the DB area with any number of branches.
* That has advantages: you can save space by sharing all the SHA1 objects.
* On the other hand, it might just make lookup slower and messier. You
* be the judge. The default case is to have one DB per managed directory.
*/
int main(int argc, char **argv)
{
const char *git_dir;
const char *sha1_dir;
char *path;
int len, i;
/*
* Set up the default .git directory contents
*/
git_dir = gitenv(GIT_DIR_ENVIRONMENT);
if (!git_dir) {
git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
fprintf(stderr, "defaulting to local storage area\n");
}
safe_create_dir(git_dir);
create_default_files(git_dir);
/*
* And set up the object store.
*/
sha1_dir = get_object_directory();
len = strlen(sha1_dir);
path = xmalloc(len + 40);
memcpy(path, sha1_dir, len);
safe_create_dir(sha1_dir);
for (i = 0; i < 256; i++) {
sprintf(path+len, "/%02x", i);
safe_create_dir(path);
}
strcpy(path+len, "/pack");
safe_create_dir(path);
return 0;
}
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