mirror of
https://github.com/git/git
synced 2024-08-27 11:39:22 +00:00
![Dmitry Potapov](/assets/img/avatar_default.png)
A lot of modules that have nothing to do with git-shell functionality were linked in, bloating git-shell more than 8 times. This patch cuts off redundant dependencies by: 1. providing stubs for three functions that make no sense for git-shell; 2. moving quote_path_fully from environment.c to quote.c to make the later self sufficient; 3. moving make_absolute_path into a new separate file. The following numbers have been received with the default optimization settings on master using GCC 4.1.2: Before: text data bss dec hex filename 143915 1348 93168 238431 3a35f git-shell After: text data bss dec hex filename 17670 788 8232 26690 6842 git-shell Signed-off-by: Junio C Hamano <gitster@pobox.com>
346 lines
7.3 KiB
C
346 lines
7.3 KiB
C
/*
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* I'm tired of doing "vsnprintf()" etc just to open a
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* file, so here's a "return static buffer with printf"
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* interface for paths.
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*
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* It's obviously not thread-safe. Sue me. But it's quite
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* useful for doing things like
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*
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* f = open(mkpath("%s/%s.git", base, name), O_RDONLY);
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*
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* which is what it's designed for.
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*/
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#include "cache.h"
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static char bad_path[] = "/bad-path/";
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static char *get_pathname(void)
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{
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static char pathname_array[4][PATH_MAX];
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static int index;
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return pathname_array[3 & ++index];
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}
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static char *cleanup_path(char *path)
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{
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/* Clean it up */
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if (!memcmp(path, "./", 2)) {
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path += 2;
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while (*path == '/')
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path++;
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}
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return path;
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}
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char *mkpath(const char *fmt, ...)
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{
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va_list args;
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unsigned len;
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char *pathname = get_pathname();
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va_start(args, fmt);
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len = vsnprintf(pathname, PATH_MAX, fmt, args);
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va_end(args);
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if (len >= PATH_MAX)
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return bad_path;
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return cleanup_path(pathname);
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}
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char *git_path(const char *fmt, ...)
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{
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const char *git_dir = get_git_dir();
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char *pathname = get_pathname();
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va_list args;
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unsigned len;
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len = strlen(git_dir);
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if (len > PATH_MAX-100)
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return bad_path;
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memcpy(pathname, git_dir, len);
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if (len && git_dir[len-1] != '/')
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pathname[len++] = '/';
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va_start(args, fmt);
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len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
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va_end(args);
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if (len >= PATH_MAX)
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return bad_path;
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return cleanup_path(pathname);
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}
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/* git_mkstemp() - create tmp file honoring TMPDIR variable */
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int git_mkstemp(char *path, size_t len, const char *template)
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{
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const char *tmp;
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size_t n;
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tmp = getenv("TMPDIR");
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if (!tmp)
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tmp = "/tmp";
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n = snprintf(path, len, "%s/%s", tmp, template);
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if (len <= n) {
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errno = ENAMETOOLONG;
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return -1;
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}
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return mkstemp(path);
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}
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int validate_headref(const char *path)
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{
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struct stat st;
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char *buf, buffer[256];
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unsigned char sha1[20];
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int fd;
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ssize_t len;
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if (lstat(path, &st) < 0)
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return -1;
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/* Make sure it is a "refs/.." symlink */
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if (S_ISLNK(st.st_mode)) {
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len = readlink(path, buffer, sizeof(buffer)-1);
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if (len >= 5 && !memcmp("refs/", buffer, 5))
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return 0;
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return -1;
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}
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/*
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* Anything else, just open it and try to see if it is a symbolic ref.
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*/
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return -1;
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len = read_in_full(fd, buffer, sizeof(buffer)-1);
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close(fd);
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/*
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* Is it a symbolic ref?
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*/
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if (len < 4)
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return -1;
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if (!memcmp("ref:", buffer, 4)) {
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buf = buffer + 4;
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len -= 4;
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while (len && isspace(*buf))
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buf++, len--;
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if (len >= 5 && !memcmp("refs/", buf, 5))
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return 0;
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}
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/*
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* Is this a detached HEAD?
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*/
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if (!get_sha1_hex(buffer, sha1))
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return 0;
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return -1;
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}
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static char *user_path(char *buf, char *path, int sz)
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{
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struct passwd *pw;
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char *slash;
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int len, baselen;
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if (!path || path[0] != '~')
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return NULL;
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path++;
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slash = strchr(path, '/');
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if (path[0] == '/' || !path[0]) {
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pw = getpwuid(getuid());
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}
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else {
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if (slash) {
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*slash = 0;
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pw = getpwnam(path);
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*slash = '/';
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}
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else
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pw = getpwnam(path);
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}
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if (!pw || !pw->pw_dir || sz <= strlen(pw->pw_dir))
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return NULL;
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baselen = strlen(pw->pw_dir);
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memcpy(buf, pw->pw_dir, baselen);
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while ((1 < baselen) && (buf[baselen-1] == '/')) {
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buf[baselen-1] = 0;
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baselen--;
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}
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if (slash && slash[1]) {
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len = strlen(slash);
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if (sz <= baselen + len)
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return NULL;
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memcpy(buf + baselen, slash, len + 1);
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}
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return buf;
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}
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/*
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* First, one directory to try is determined by the following algorithm.
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*
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* (0) If "strict" is given, the path is used as given and no DWIM is
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* done. Otherwise:
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* (1) "~/path" to mean path under the running user's home directory;
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* (2) "~user/path" to mean path under named user's home directory;
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* (3) "relative/path" to mean cwd relative directory; or
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* (4) "/absolute/path" to mean absolute directory.
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*
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* Unless "strict" is given, we try access() for existence of "%s.git/.git",
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* "%s/.git", "%s.git", "%s" in this order. The first one that exists is
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* what we try.
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*
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* Second, we try chdir() to that. Upon failure, we return NULL.
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*
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* Then, we try if the current directory is a valid git repository.
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* Upon failure, we return NULL.
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*
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* If all goes well, we return the directory we used to chdir() (but
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* before ~user is expanded), avoiding getcwd() resolving symbolic
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* links. User relative paths are also returned as they are given,
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* except DWIM suffixing.
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*/
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char *enter_repo(char *path, int strict)
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{
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static char used_path[PATH_MAX];
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static char validated_path[PATH_MAX];
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if (!path)
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return NULL;
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if (!strict) {
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static const char *suffix[] = {
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".git/.git", "/.git", ".git", "", NULL,
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};
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int len = strlen(path);
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int i;
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while ((1 < len) && (path[len-1] == '/')) {
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path[len-1] = 0;
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len--;
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}
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if (PATH_MAX <= len)
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return NULL;
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if (path[0] == '~') {
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if (!user_path(used_path, path, PATH_MAX))
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return NULL;
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strcpy(validated_path, path);
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path = used_path;
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}
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else if (PATH_MAX - 10 < len)
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return NULL;
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else {
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path = strcpy(used_path, path);
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strcpy(validated_path, path);
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}
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len = strlen(path);
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for (i = 0; suffix[i]; i++) {
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strcpy(path + len, suffix[i]);
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if (!access(path, F_OK)) {
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strcat(validated_path, suffix[i]);
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break;
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}
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}
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if (!suffix[i] || chdir(path))
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return NULL;
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path = validated_path;
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}
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else if (chdir(path))
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return NULL;
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if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 &&
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validate_headref("HEAD") == 0) {
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setenv(GIT_DIR_ENVIRONMENT, ".", 1);
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check_repository_format();
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return path;
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}
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return NULL;
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}
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int adjust_shared_perm(const char *path)
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{
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struct stat st;
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int mode;
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if (!shared_repository)
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return 0;
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if (lstat(path, &st) < 0)
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return -1;
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mode = st.st_mode;
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if (shared_repository) {
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int tweak = shared_repository;
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if (!(mode & S_IWUSR))
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tweak &= ~0222;
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mode = (mode & ~0777) | tweak;
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} else {
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/* Preserve old PERM_UMASK behaviour */
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if (mode & S_IWUSR)
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mode |= S_IWGRP;
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}
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if (S_ISDIR(mode)) {
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mode |= FORCE_DIR_SET_GID;
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/* Copy read bits to execute bits */
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mode |= (shared_repository & 0444) >> 2;
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}
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if ((mode & st.st_mode) != mode && chmod(path, mode) < 0)
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return -2;
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return 0;
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}
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static const char *get_pwd_cwd(void)
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{
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static char cwd[PATH_MAX + 1];
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char *pwd;
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struct stat cwd_stat, pwd_stat;
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if (getcwd(cwd, PATH_MAX) == NULL)
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return NULL;
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pwd = getenv("PWD");
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if (pwd && strcmp(pwd, cwd)) {
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stat(cwd, &cwd_stat);
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if (!stat(pwd, &pwd_stat) &&
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pwd_stat.st_dev == cwd_stat.st_dev &&
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pwd_stat.st_ino == cwd_stat.st_ino) {
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strlcpy(cwd, pwd, PATH_MAX);
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}
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}
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return cwd;
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}
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const char *make_nonrelative_path(const char *path)
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{
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static char buf[PATH_MAX + 1];
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if (is_absolute_path(path)) {
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if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
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die ("Too long path: %.*s", 60, path);
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} else {
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const char *cwd = get_pwd_cwd();
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if (!cwd)
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die("Cannot determine the current working directory");
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if (snprintf(buf, PATH_MAX, "%s/%s", cwd, path) >= PATH_MAX)
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die ("Too long path: %.*s", 60, path);
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}
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return buf;
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}
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const char *make_relative_path(const char *abs, const char *base)
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{
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static char buf[PATH_MAX + 1];
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int baselen;
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if (!base)
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return abs;
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baselen = strlen(base);
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if (prefixcmp(abs, base))
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return abs;
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if (abs[baselen] == '/')
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baselen++;
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else if (base[baselen - 1] != '/')
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return abs;
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strcpy(buf, abs + baselen);
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return buf;
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}
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