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![Nguyễn Thái Ngọc Duy](/assets/img/avatar_default.png)
Save the path from the original cwd to the cwd at the end of the
setup procedure in the startup_info struct introduced in e37c1329
(2010-08-05). The value cannot vary from thread to thread anyway,
since the cwd is global.
So now in your builtin command, instead of passing prefix around,
when you want to convert a user-supplied path to a cwd-relative
path, you can use startup_info->prefix directly.
Caveat: As with the return value from setup_git_directory_gently(),
startup_info->prefix would be NULL when the original cwd is not a
subdir of the toplevel.
Longer term, this would allow the prefix to be reused when several
noncooperating functions require access to the same repository (for
example, when accessing configuration before running a builtin).
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
622 lines
16 KiB
C
622 lines
16 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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if (PATH_MAX <= len + strlen("/objects"))
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die("Too long path: %.*s", 60, 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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static const char *setup_explicit_git_dir(const char *gitdirenv,
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const char *work_tree_env, int *nongit_ok)
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{
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static char buffer[1024 + 1];
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const char *retval;
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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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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 (!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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static int cwd_contains_git_dir(const char **gitfile_dirp)
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{
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const char *gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
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*gitfile_dirp = gitfile_dir;
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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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return 1;
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}
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return is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT);
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}
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static const char *setup_discovered_git_dir(const char *work_tree_env,
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int offset, int len, char *cwd, int *nongit_ok)
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{
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int root_len;
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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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static const char *setup_bare_git_dir(const char *work_tree_env,
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int offset, int len, char *cwd, int *nongit_ok)
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{
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int root_len;
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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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if (chdir(cwd))
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die_errno("Cannot come back to cwd");
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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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static const char *setup_nongit(const char *cwd, int *nongit_ok)
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{
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if (!nongit_ok)
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die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
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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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static dev_t get_device_or_die(const char *path, const char *prefix)
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{
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struct stat buf;
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if (stat(path, &buf))
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die_errno("failed to stat '%s%s%s'",
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prefix ? prefix : "",
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prefix ? "/" : "", path);
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return buf.st_dev;
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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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static const char *setup_git_directory_gently_1(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;
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dev_t current_device = 0;
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int one_filesystem = 1;
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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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return setup_explicit_git_dir(gitdirenv, work_tree_env, nongit_ok);
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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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current_device = get_device_or_die(".", NULL);
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for (;;) {
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if (cwd_contains_git_dir(&gitfile_dir))
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return setup_discovered_git_dir(work_tree_env, offset,
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len, cwd, nongit_ok);
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if (is_git_directory("."))
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return setup_bare_git_dir(work_tree_env, offset,
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len, cwd, nongit_ok);
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while (--offset > ceil_offset && cwd[offset] != '/');
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if (offset <= ceil_offset)
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return setup_nongit(cwd, nongit_ok);
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if (one_filesystem) {
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dev_t parent_device = get_device_or_die("..", cwd);
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if (parent_device != current_device) {
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if (nongit_ok) {
|
|
if (chdir(cwd))
|
|
die_errno("Cannot come back to cwd");
|
|
*nongit_ok = 1;
|
|
return NULL;
|
|
}
|
|
cwd[offset] = '\0';
|
|
die("Not a git repository (or any parent up to mount parent %s)\n"
|
|
"Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
|
|
}
|
|
}
|
|
if (chdir("..")) {
|
|
cwd[offset] = '\0';
|
|
die_errno("Cannot change to '%s/..'", cwd);
|
|
}
|
|
}
|
|
}
|
|
|
|
const char *setup_git_directory_gently(int *nongit_ok)
|
|
{
|
|
const char *prefix;
|
|
|
|
prefix = setup_git_directory_gently_1(nongit_ok);
|
|
if (startup_info) {
|
|
startup_info->have_repository = !nongit_ok || !*nongit_ok;
|
|
startup_info->prefix = prefix;
|
|
}
|
|
return prefix;
|
|
}
|
|
|
|
int git_config_perm(const char *var, const char *value)
|
|
{
|
|
int i;
|
|
char *endptr;
|
|
|
|
if (value == NULL)
|
|
return PERM_GROUP;
|
|
|
|
if (!strcmp(value, "umask"))
|
|
return PERM_UMASK;
|
|
if (!strcmp(value, "group"))
|
|
return PERM_GROUP;
|
|
if (!strcmp(value, "all") ||
|
|
!strcmp(value, "world") ||
|
|
!strcmp(value, "everybody"))
|
|
return PERM_EVERYBODY;
|
|
|
|
/* Parse octal numbers */
|
|
i = strtol(value, &endptr, 8);
|
|
|
|
/* If not an octal number, maybe true/false? */
|
|
if (*endptr != 0)
|
|
return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
|
|
|
|
/*
|
|
* Treat values 0, 1 and 2 as compatibility cases, otherwise it is
|
|
* a chmod value to restrict to.
|
|
*/
|
|
switch (i) {
|
|
case PERM_UMASK: /* 0 */
|
|
return PERM_UMASK;
|
|
case OLD_PERM_GROUP: /* 1 */
|
|
return PERM_GROUP;
|
|
case OLD_PERM_EVERYBODY: /* 2 */
|
|
return PERM_EVERYBODY;
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/*
|
|
* Returns the "prefix", a path to the current working directory
|
|
* relative to the work tree root, or NULL, if the current working
|
|
* directory is not a strict subdirectory of the work tree root. The
|
|
* prefix always ends with a '/' character.
|
|
*/
|
|
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;
|
|
}
|