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![Johannes Schindelin](/assets/img/avatar_default.png)
If the config variable 'core.sharedrepository' is set, the directories $GIT_DIR/objects/ $GIT_DIR/objects/?? $GIT_DIR/objects/pack $GIT_DIR/refs $GIT_DIR/refs/heads $GIT_DIR/refs/heads/tags are set group writable (and g+s, since the git group may be not the primary group of all users). Since all files are written as lock files first, and then moved to their destination, they do not have to be group writable. Indeed, if this leads to problems you found a bug. Note that -- as in my first attempt -- the config variable is set in the function which checks the repository format. If this were done in git_default_config instead, a lot of programs would need to be modified to call git_config(git_default_config) first. [jc: git variables should be in environment.c unless there is a compelling reason to do otherwise.] Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
203 lines
4.4 KiB
C
203 lines
4.4 KiB
C
#include "cache.h"
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const char *prefix_path(const char *prefix, int len, const char *path)
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{
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const char *orig = path;
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for (;;) {
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char c;
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if (*path != '.')
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break;
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c = path[1];
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/* "." */
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if (!c) {
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path++;
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break;
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}
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/* "./" */
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if (c == '/') {
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path += 2;
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continue;
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}
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if (c != '.')
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break;
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c = path[2];
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if (!c)
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path += 2;
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else if (c == '/')
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path += 3;
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else
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break;
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/* ".." and "../" */
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/* Remove last component of the prefix */
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do {
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if (!len)
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die("'%s' is outside repository", orig);
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len--;
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} while (len && prefix[len-1] != '/');
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continue;
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}
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if (len) {
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int speclen = strlen(path);
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char *n = xmalloc(speclen + len + 1);
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memcpy(n, prefix, len);
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memcpy(n + len, path, speclen+1);
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path = n;
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}
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return path;
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}
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/*
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* Unlike prefix_path, this should be used if the named file does
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* not have to interact with index entry; i.e. name of a random file
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* on the filesystem.
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*/
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const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
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{
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static char path[PATH_MAX];
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if (!pfx || !*pfx || arg[0] == '/')
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return arg;
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memcpy(path, pfx, pfx_len);
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strcpy(path + pfx_len, arg);
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return path;
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}
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const char **get_pathspec(const char *prefix, const char **pathspec)
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{
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const char *entry = *pathspec;
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const char **p;
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int prefixlen;
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if (!prefix && !entry)
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return NULL;
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if (!entry) {
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static const char *spec[2];
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spec[0] = prefix;
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spec[1] = NULL;
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return spec;
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}
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/* Otherwise we have to re-write the entries.. */
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p = pathspec;
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prefixlen = prefix ? strlen(prefix) : 0;
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do {
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*p = prefix_path(prefix, prefixlen, entry);
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} while ((entry = *++p) != NULL);
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return (const char **) pathspec;
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}
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/*
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* Test if it looks like we're at the top level git directory.
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* We want to see:
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*
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* - either a .git/objects/ directory _or_ the proper
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* GIT_OBJECT_DIRECTORY environment variable
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* - a refs/ directory under ".git"
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* - either a HEAD symlink or a HEAD file that is formatted as
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* a proper "ref:".
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*/
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static int is_toplevel_directory(void)
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{
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if (access(".git/refs/", X_OK) ||
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access(getenv(DB_ENVIRONMENT) ?
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getenv(DB_ENVIRONMENT) : ".git/objects/", X_OK) ||
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validate_symref(".git/HEAD"))
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return 0;
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return 1;
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}
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const char *setup_git_directory_gently(int *nongit_ok)
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{
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static char cwd[PATH_MAX+1];
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int len, offset;
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/*
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* If GIT_DIR is set explicitly, we're not going
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* to do any discovery, but we still do repository
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* validation.
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*/
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if (getenv(GIT_DIR_ENVIRONMENT)) {
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char path[PATH_MAX];
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int len = strlen(getenv(GIT_DIR_ENVIRONMENT));
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if (sizeof(path) - 40 < len)
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die("'$%s' too big", GIT_DIR_ENVIRONMENT);
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memcpy(path, getenv(GIT_DIR_ENVIRONMENT), len);
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strcpy(path + len, "/refs");
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if (access(path, X_OK))
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goto bad_dir_environ;
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strcpy(path + len, "/HEAD");
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if (validate_symref(path))
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goto bad_dir_environ;
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if (getenv(DB_ENVIRONMENT)) {
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if (access(getenv(DB_ENVIRONMENT), X_OK))
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goto bad_dir_environ;
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}
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else {
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strcpy(path + len, "/objects");
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if (access(path, X_OK))
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goto bad_dir_environ;
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}
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return NULL;
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bad_dir_environ:
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path[len] = 0;
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die("Not a git repository: '%s'", path);
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}
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if (!getcwd(cwd, sizeof(cwd)) || cwd[0] != '/')
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die("Unable to read current working directory");
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offset = len = strlen(cwd);
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for (;;) {
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if (is_toplevel_directory())
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break;
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chdir("..");
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do {
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if (!offset) {
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if (nongit_ok) {
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if (chdir(cwd))
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die("Cannot come back to cwd");
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*nongit_ok = 1;
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return NULL;
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}
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die("Not a git repository");
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}
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} while (cwd[--offset] != '/');
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}
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if (offset == len)
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return NULL;
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/* Make "offset" point to past the '/', and add a '/' at the end */
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offset++;
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cwd[len++] = '/';
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cwd[len] = 0;
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return cwd + offset;
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}
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int check_repository_format_version(const char *var, const char *value)
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{
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if (strcmp(var, "core.repositoryformatversion") == 0)
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repository_format_version = git_config_int(var, value);
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else if (strcmp(var, "core.sharedrepository") == 0)
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shared_repository = git_config_bool(var, value);
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return 0;
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}
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int check_repository_format(void)
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{
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git_config(check_repository_format_version);
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if (GIT_REPO_VERSION < repository_format_version)
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die ("Expected git repo version <= %d, found %d",
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GIT_REPO_VERSION, repository_format_version);
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return 0;
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}
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const char *setup_git_directory(void)
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{
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const char *retval = setup_git_directory_gently(NULL);
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check_repository_format();
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return retval;
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}
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