зеркало из https://github.com/microsoft/git.git
128 строки
2.4 KiB
C
128 строки
2.4 KiB
C
#include "cache.h"
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char *prefix_path(const char *prefix, int len, char *path)
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{
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char *orig = path;
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for (;;) {
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char c;
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if (*path != '.')
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break;
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c = path[1];
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/* "." */
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if (!c) {
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path++;
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break;
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}
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/* "./" */
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if (c == '/') {
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path += 2;
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continue;
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}
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if (c != '.')
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break;
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c = path[2];
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if (!c)
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path += 2;
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else if (c == '/')
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path += 3;
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else
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break;
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/* ".." and "../" */
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/* Remove last component of the prefix */
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do {
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if (!len)
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die("'%s' is outside repository", orig);
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len--;
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} while (len && prefix[len-1] != '/');
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continue;
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}
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if (len) {
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int speclen = strlen(path);
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char *n = xmalloc(speclen + len + 1);
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memcpy(n, prefix, len);
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memcpy(n + len, path, speclen+1);
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path = n;
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}
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return path;
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}
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const char **get_pathspec(const char *prefix, char **pathspec)
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{
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char *entry = *pathspec;
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char **p;
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int prefixlen;
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if (!prefix && !entry)
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return NULL;
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if (!entry) {
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static const char *spec[2];
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spec[0] = prefix;
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spec[1] = NULL;
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return spec;
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}
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/* Otherwise we have to re-write the entries.. */
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p = pathspec;
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prefixlen = prefix ? strlen(prefix) : 0;
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do {
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*p = prefix_path(prefix, prefixlen, entry);
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} while ((entry = *++p) != NULL);
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return (const char **) pathspec;
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}
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/*
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* Test it it looks like we're at the top
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* level git directory. We want to see a
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*
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* - a HEAD symlink and a refs/ directory under ".git"
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* - either a .git/objects/ directory _or_ the proper
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* GIT_OBJECT_DIRECTORY environment variable
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*/
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static int is_toplevel_directory(void)
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{
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struct stat st;
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return !lstat(".git/HEAD", &st) &&
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S_ISLNK(st.st_mode) &&
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!access(".git/refs/", X_OK) &&
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(gitenv(DB_ENVIRONMENT) || !access(".git/objects/", X_OK));
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}
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const char *setup_git_directory(void)
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{
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static char cwd[PATH_MAX+1];
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int len, offset;
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/*
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* If GIT_DIR is set explicitly, we're not going
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* to do any discovery
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*/
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if (gitenv(GIT_DIR_ENVIRONMENT))
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return NULL;
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if (!getcwd(cwd, sizeof(cwd)) || cwd[0] != '/')
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die("Unable to read current working directory");
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offset = len = strlen(cwd);
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for (;;) {
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if (is_toplevel_directory())
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break;
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chdir("..");
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do {
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if (!offset)
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die("Not a git repository");
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} while (cwd[--offset] != '/');
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}
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if (offset == len)
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return NULL;
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/* Make "offset" point to past the '/', and add a '/' at the end */
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offset++;
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cwd[len++] = '/';
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cwd[len] = 0;
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return cwd + offset;
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}
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