e0a87193d3
We wanted --strict to mean "do not DWIM", but the code required to see absolute path. daemon does its own path verification and chdirs to the verified repository, so enter_repo() called from upload-pack will always enter ".". Requiring absolute path does not make any sense. Signed-off-by: Junio C Hamano <junkio@cox.net>
207 lines
3.8 KiB
C
207 lines
3.8 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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#include <pwd.h>
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static char pathname[PATH_MAX];
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static char bad_path[] = "/bad-path/";
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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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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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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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char *env, *pch = path;
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if ((env = getenv("TMPDIR")) == NULL) {
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strcpy(pch, "/tmp/");
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len -= 5;
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pch += 5;
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} else {
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size_t n = snprintf(pch, len, "%s/", env);
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len -= n;
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pch += n;
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}
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safe_strncpy(pch, template, len);
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return mkstemp(path);
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}
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char *safe_strncpy(char *dest, const char *src, size_t n)
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{
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strncpy(dest, src, n);
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dest[n - 1] = '\0';
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return dest;
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}
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int validate_symref(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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int len, fd;
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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(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 || memcmp("ref:", buffer, 4))
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return -1;
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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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return -1;
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}
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static char *current_dir(void)
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{
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return getcwd(pathname, sizeof(pathname));
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}
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static int user_chdir(char *path)
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{
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char *dir = path;
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if(*dir == '~') { /* user-relative path */
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struct passwd *pw;
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char *slash = strchr(dir, '/');
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dir++;
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/* '~/' and '~' (no slash) means users own home-dir */
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if(!*dir || *dir == '/')
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pw = getpwuid(getuid());
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else {
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if (slash) {
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*slash = '\0';
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pw = getpwnam(dir);
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*slash = '/';
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}
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else
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pw = getpwnam(dir);
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}
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/* make sure we got something back that we can chdir() to */
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if(!pw || chdir(pw->pw_dir) < 0)
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return -1;
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if(!slash || !slash[1]) /* no path following username */
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return 0;
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dir = slash + 1;
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}
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/* ~foo/path/to/repo is now path/to/repo and we're in foo's homedir */
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if(chdir(dir) < 0)
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return -1;
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return 0;
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}
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char *enter_repo(char *path, int strict)
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{
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if(!path)
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return NULL;
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if (strict) {
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if (chdir(path) < 0)
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return NULL;
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}
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else {
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if (!*path)
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; /* happy -- no chdir */
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else if (!user_chdir(path))
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; /* happy -- as given */
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else if (!user_chdir(mkpath("%s.git", path)))
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; /* happy -- uemacs --> uemacs.git */
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else
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return NULL;
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(void)chdir(".git");
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}
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if(access("objects", X_OK) == 0 && access("refs", X_OK) == 0 &&
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validate_symref("HEAD") == 0) {
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putenv("GIT_DIR=.");
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return current_dir();
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}
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return NULL;
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}
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