mirror of
https://github.com/git/git
synced 2024-10-30 14:03:28 +00:00
cf87463e79
If a missing ONE_FILESYSTEM defaults to true, the only users who set this variable set it to false to tell git not to limit the discovery to one filesystem; there are too many negations in one sentence to make a simple panda brain dizzy. Use the variable GIT_DISCOVERY_ACROSS_FILESYSTEM that changes the behaviour from the default "limit to one filesystem" to "cross the boundary as I ask you to"; makes the semantics much more straight forward. Signed-off-by: Junio C Hamano <gitster@pobox.com>
566 lines
14 KiB
C
566 lines
14 KiB
C
#include "cache.h"
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#include "dir.h"
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static int inside_git_dir = -1;
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static int inside_work_tree = -1;
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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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char *sanitized = xmalloc(len + strlen(path) + 1);
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if (is_absolute_path(orig))
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strcpy(sanitized, path);
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else {
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if (len)
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memcpy(sanitized, prefix, len);
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strcpy(sanitized + len, path);
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}
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if (normalize_path_copy(sanitized, sanitized))
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goto error_out;
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if (is_absolute_path(orig)) {
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size_t root_len, len, total;
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const char *work_tree = get_git_work_tree();
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if (!work_tree)
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goto error_out;
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len = strlen(work_tree);
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root_len = offset_1st_component(work_tree);
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total = strlen(sanitized) + 1;
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if (strncmp(sanitized, work_tree, len) ||
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(len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
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error_out:
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die("'%s' is outside repository", orig);
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}
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if (sanitized[len] == '/')
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len++;
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memmove(sanitized, sanitized + len, total - len);
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}
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return sanitized;
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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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#ifndef WIN32
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if (!pfx || !*pfx || is_absolute_path(arg))
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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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#else
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char *p;
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/* don't add prefix to absolute paths, but still replace '\' by '/' */
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if (is_absolute_path(arg))
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pfx_len = 0;
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else
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memcpy(path, pfx, pfx_len);
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strcpy(path + pfx_len, arg);
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for (p = path + pfx_len; *p; p++)
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if (*p == '\\')
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*p = '/';
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#endif
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return path;
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}
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int check_filename(const char *prefix, const char *arg)
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{
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const char *name;
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struct stat st;
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name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
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if (!lstat(name, &st))
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return 1; /* file exists */
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if (errno == ENOENT || errno == ENOTDIR)
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return 0; /* file does not exist */
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die_errno("failed to stat '%s'", arg);
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}
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static void NORETURN die_verify_filename(const char *prefix, const char *arg)
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{
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unsigned char sha1[20];
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unsigned mode;
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/* try a detailed diagnostic ... */
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get_sha1_with_mode_1(arg, sha1, &mode, 0, prefix);
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/* ... or fall back the most general message. */
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die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
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"Use '--' to separate paths from revisions", arg);
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}
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/*
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* Verify a filename that we got as an argument for a pathspec
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* entry. Note that a filename that begins with "-" never verifies
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* as true, because even if such a filename were to exist, we want
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* it to be preceded by the "--" marker (or we want the user to
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* use a format like "./-filename")
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*/
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void verify_filename(const char *prefix, const char *arg)
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{
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if (*arg == '-')
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die("bad flag '%s' used after filename", arg);
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if (check_filename(prefix, arg))
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return;
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die_verify_filename(prefix, arg);
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}
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/*
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* Opposite of the above: the command line did not have -- marker
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* and we parsed the arg as a refname. It should not be interpretable
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* as a filename.
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*/
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void verify_non_filename(const char *prefix, const char *arg)
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{
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if (!is_inside_work_tree() || is_inside_git_dir())
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return;
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if (*arg == '-')
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return; /* flag */
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if (!check_filename(prefix, arg))
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return;
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die("ambiguous argument '%s': both revision and filename\n"
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"Use '--' to separate filenames from revisions", arg);
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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 **src, **dst;
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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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src = pathspec;
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dst = pathspec;
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prefixlen = prefix ? strlen(prefix) : 0;
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while (*src) {
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const char *p = prefix_path(prefix, prefixlen, *src);
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*(dst++) = p;
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src++;
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}
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*dst = NULL;
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if (!*pathspec)
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return NULL;
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return pathspec;
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}
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/*
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* Test if it looks like we're at a git directory.
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* We want to see:
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*
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* - either an objects/ directory _or_ the proper
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* GIT_OBJECT_DIRECTORY environment variable
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* - a refs/ directory
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* - either a HEAD symlink or a HEAD file that is formatted as
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* a proper "ref:", or a regular file HEAD that has a properly
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* formatted sha1 object name.
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*/
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static int is_git_directory(const char *suspect)
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{
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char path[PATH_MAX];
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size_t len = strlen(suspect);
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strcpy(path, suspect);
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if (getenv(DB_ENVIRONMENT)) {
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if (access(getenv(DB_ENVIRONMENT), X_OK))
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return 0;
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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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return 0;
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}
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strcpy(path + len, "/refs");
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if (access(path, X_OK))
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return 0;
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strcpy(path + len, "/HEAD");
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if (validate_headref(path))
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return 0;
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return 1;
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}
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int is_inside_git_dir(void)
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{
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if (inside_git_dir < 0)
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inside_git_dir = is_inside_dir(get_git_dir());
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return inside_git_dir;
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}
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int is_inside_work_tree(void)
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{
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if (inside_work_tree < 0)
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inside_work_tree = is_inside_dir(get_git_work_tree());
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return inside_work_tree;
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}
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/*
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* set_work_tree() is only ever called if you set GIT_DIR explicitly.
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* The old behaviour (which we retain here) is to set the work tree root
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* to the cwd, unless overridden by the config, the command line, or
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* GIT_WORK_TREE.
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*/
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static const char *set_work_tree(const char *dir)
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{
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char buffer[PATH_MAX + 1];
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if (!getcwd(buffer, sizeof(buffer)))
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die ("Could not get the current working directory");
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git_work_tree_cfg = xstrdup(buffer);
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inside_work_tree = 1;
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return NULL;
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}
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void setup_work_tree(void)
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{
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const char *work_tree, *git_dir;
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static int initialized = 0;
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if (initialized)
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return;
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work_tree = get_git_work_tree();
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git_dir = get_git_dir();
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if (!is_absolute_path(git_dir))
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git_dir = make_absolute_path(git_dir);
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if (!work_tree || chdir(work_tree))
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die("This operation must be run in a work tree");
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set_git_dir(make_relative_path(git_dir, work_tree));
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initialized = 1;
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}
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static int check_repository_format_gently(int *nongit_ok)
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{
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git_config(check_repository_format_version, NULL);
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if (GIT_REPO_VERSION < repository_format_version) {
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if (!nongit_ok)
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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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warning("Expected git repo version <= %d, found %d",
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GIT_REPO_VERSION, repository_format_version);
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warning("Please upgrade Git");
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*nongit_ok = -1;
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return -1;
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}
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return 0;
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}
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/*
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* Try to read the location of the git directory from the .git file,
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* return path to git directory if found.
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*/
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const char *read_gitfile_gently(const char *path)
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{
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char *buf;
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char *dir;
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const char *slash;
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struct stat st;
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int fd;
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size_t len;
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if (stat(path, &st))
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return NULL;
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if (!S_ISREG(st.st_mode))
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return NULL;
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fd = open(path, O_RDONLY);
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if (fd < 0)
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die_errno("Error opening '%s'", path);
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buf = xmalloc(st.st_size + 1);
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len = read_in_full(fd, buf, st.st_size);
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close(fd);
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if (len != st.st_size)
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die("Error reading %s", path);
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buf[len] = '\0';
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if (prefixcmp(buf, "gitdir: "))
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die("Invalid gitfile format: %s", path);
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while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
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len--;
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if (len < 9)
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die("No path in gitfile: %s", path);
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buf[len] = '\0';
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dir = buf + 8;
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if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
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size_t pathlen = slash+1 - path;
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size_t dirlen = pathlen + len - 8;
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dir = xmalloc(dirlen + 1);
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strncpy(dir, path, pathlen);
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strncpy(dir + pathlen, buf + 8, len - 8);
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dir[dirlen] = '\0';
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free(buf);
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buf = dir;
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}
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if (!is_git_directory(dir))
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die("Not a git repository: %s", dir);
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path = make_absolute_path(dir);
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free(buf);
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return path;
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}
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/*
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* We cannot decide in this function whether we are in the work tree or
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* not, since the config can only be read _after_ this function was called.
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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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const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
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const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
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static char cwd[PATH_MAX+1];
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const char *gitdirenv;
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const char *gitfile_dir;
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int len, offset, ceil_offset, root_len;
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int current_device = 0, one_filesystem = 1;
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struct stat buf;
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/*
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* Let's assume that we are in a git repository.
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* If it turns out later that we are somewhere else, the value will be
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* updated accordingly.
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*/
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if (nongit_ok)
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*nongit_ok = 0;
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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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gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
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if (gitdirenv) {
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if (PATH_MAX - 40 < strlen(gitdirenv))
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die("'$%s' too big", GIT_DIR_ENVIRONMENT);
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if (is_git_directory(gitdirenv)) {
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static char buffer[1024 + 1];
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const char *retval;
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if (!work_tree_env) {
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retval = set_work_tree(gitdirenv);
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/* config may override worktree */
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if (check_repository_format_gently(nongit_ok))
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return NULL;
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return retval;
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}
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if (check_repository_format_gently(nongit_ok))
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return NULL;
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retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
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get_git_work_tree());
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if (!retval || !*retval)
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return NULL;
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set_git_dir(make_absolute_path(gitdirenv));
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if (chdir(work_tree_env) < 0)
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die_errno ("Could not chdir to '%s'", work_tree_env);
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strcat(buffer, "/");
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return retval;
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}
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if (nongit_ok) {
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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: '%s'", gitdirenv);
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}
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if (!getcwd(cwd, sizeof(cwd)-1))
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die_errno("Unable to read current working directory");
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ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
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if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
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ceil_offset = 1;
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/*
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* Test in the following order (relative to the cwd):
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* - .git (file containing "gitdir: <path>")
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* - .git/
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* - ./ (bare)
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* - ../.git
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* - ../.git/
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* - ../ (bare)
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* - ../../.git/
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* etc.
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*/
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offset = len = strlen(cwd);
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one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
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if (one_filesystem) {
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if (stat(".", &buf))
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die_errno("failed to stat '.'");
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current_device = buf.st_dev;
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}
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for (;;) {
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gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
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if (gitfile_dir) {
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if (set_git_dir(gitfile_dir))
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die("Repository setup failed");
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break;
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}
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if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
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break;
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if (is_git_directory(".")) {
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inside_git_dir = 1;
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if (!work_tree_env)
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inside_work_tree = 0;
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if (offset != len) {
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root_len = offset_1st_component(cwd);
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cwd[offset > root_len ? offset : root_len] = '\0';
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set_git_dir(cwd);
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} else
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set_git_dir(".");
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check_repository_format_gently(nongit_ok);
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return NULL;
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}
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while (--offset > ceil_offset && cwd[offset] != '/');
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if (offset <= ceil_offset) {
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if (nongit_ok) {
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if (chdir(cwd))
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die_errno("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 (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
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}
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if (one_filesystem) {
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if (stat("..", &buf)) {
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cwd[offset] = '\0';
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die_errno("failed to stat '%s/..'", cwd);
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}
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if (buf.st_dev != current_device) {
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if (nongit_ok) {
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if (chdir(cwd))
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die_errno("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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cwd[offset] = '\0';
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die("Not a git repository (or any parent up to mount parent %s)\n"
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"Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
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}
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}
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if (chdir("..")) {
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cwd[offset] = '\0';
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die_errno("Cannot change to '%s/..'", cwd);
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}
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}
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inside_git_dir = 0;
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if (!work_tree_env)
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inside_work_tree = 1;
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root_len = offset_1st_component(cwd);
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git_work_tree_cfg = xstrndup(cwd, offset > root_len ? offset : root_len);
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if (check_repository_format_gently(nongit_ok))
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return NULL;
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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 git_config_perm(const char *var, const char *value)
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{
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int i;
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char *endptr;
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if (value == NULL)
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return PERM_GROUP;
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|
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if (!strcmp(value, "umask"))
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return PERM_UMASK;
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if (!strcmp(value, "group"))
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return PERM_GROUP;
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if (!strcmp(value, "all") ||
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!strcmp(value, "world") ||
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!strcmp(value, "everybody"))
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return PERM_EVERYBODY;
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/* Parse octal numbers */
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i = strtol(value, &endptr, 8);
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/* If not an octal number, maybe true/false? */
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if (*endptr != 0)
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return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
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|
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/*
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* Treat values 0, 1 and 2 as compatibility cases, otherwise it is
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* a chmod value to restrict to.
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*/
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switch (i) {
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case PERM_UMASK: /* 0 */
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return PERM_UMASK;
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case OLD_PERM_GROUP: /* 1 */
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return PERM_GROUP;
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case OLD_PERM_EVERYBODY: /* 2 */
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return PERM_EVERYBODY;
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}
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|
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/* A filemode value was given: 0xxx */
|
|
|
|
if ((i & 0600) != 0600)
|
|
die("Problem with core.sharedRepository filemode value "
|
|
"(0%.3o).\nThe owner of files must always have "
|
|
"read and write permissions.", i);
|
|
|
|
/*
|
|
* Mask filemode value. Others can not get write permission.
|
|
* x flags for directories are handled separately.
|
|
*/
|
|
return -(i & 0666);
|
|
}
|
|
|
|
int check_repository_format_version(const char *var, const char *value, void *cb)
|
|
{
|
|
if (strcmp(var, "core.repositoryformatversion") == 0)
|
|
repository_format_version = git_config_int(var, value);
|
|
else if (strcmp(var, "core.sharedrepository") == 0)
|
|
shared_repository = git_config_perm(var, value);
|
|
else if (strcmp(var, "core.bare") == 0) {
|
|
is_bare_repository_cfg = git_config_bool(var, value);
|
|
if (is_bare_repository_cfg == 1)
|
|
inside_work_tree = -1;
|
|
} else if (strcmp(var, "core.worktree") == 0) {
|
|
if (!value)
|
|
return config_error_nonbool(var);
|
|
free(git_work_tree_cfg);
|
|
git_work_tree_cfg = xstrdup(value);
|
|
inside_work_tree = -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int check_repository_format(void)
|
|
{
|
|
return check_repository_format_gently(NULL);
|
|
}
|
|
|
|
const char *setup_git_directory(void)
|
|
{
|
|
const char *retval = setup_git_directory_gently(NULL);
|
|
|
|
/* If the work tree is not the default one, recompute prefix */
|
|
if (inside_work_tree < 0) {
|
|
static char buffer[PATH_MAX + 1];
|
|
char *rel;
|
|
if (retval && chdir(retval))
|
|
die_errno ("Could not jump back into original cwd");
|
|
rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
|
|
if (rel && *rel && chdir(get_git_work_tree()))
|
|
die_errno ("Could not jump to working directory");
|
|
return rel && *rel ? strcat(rel, "/") : NULL;
|
|
}
|
|
|
|
return retval;
|
|
}
|