wroclaw-git-backups/nix
1
0
Fork 0
mirror of https://github.com/NixOS/nix synced 2025-07-05 16:31:47 +02:00
Code Activity

* Some refactoring.

Browse source
This commit is contained in:
Eelco Dolstra 2003-05-26 13:45:00 +00:00
parent f8d91f20e6
commit 8b930a0c94
8 changed files with 276 additions and 235 deletions
Download patch file Download diff file Expand all files Collapse all files

100
src/util.hh
View file

@ -39,104 +39,22 @@ public:
typedef vector<string> Strings;
/* !!! the following shouldn't be here; abuse of the preprocessor */
/* The canonical system name, as returned by config.guess. */
static string thisSystem = SYSTEM;
extern string thisSystem;
/* The prefix of the Nix installation, and the environment variable
that can be used to override the default. */
static string nixHomeDir = "/nix";
static string nixHomeDirEnvVar = "NIX";
extern string nixHomeDir;
extern string nixHomeDirEnvVar;
string absPath(string filename, string dir = "")
{
if (filename[0] != '/') {
if (dir == "") {
char buf[PATH_MAX];
if (!getcwd(buf, sizeof(buf)))
throw Error("cannot get cwd");
dir = buf;
}
filename = dir + "/" + filename;
/* !!! canonicalise */
char resolved[PATH_MAX];
if (!realpath(filename.c_str(), resolved))
throw Error("cannot canonicalise path " + filename);
filename = resolved;
}
return filename;
}
string printHash(unsigned char * buf)
{
ostringstream str;
for (int i = 0; i < 16; i++) {
str.fill('0');
str.width(2);
str << hex << (int) buf[i];
}
return str.str();
}
/* Verify that a reference is valid (that is, is a MD5 hash code). */
bool isHash(const string & s)
{
if (s.length() != 32) return false;
for (int i = 0; i < 32; i++) {
char c = s[i];
if (!((c >= '0' && c <= '9') ||
(c >= 'a' && c <= 'f')))
return false;
}
return true;
}
void checkHash(const string & s)
{
if (!isHash(s)) throw BadRefError("invalid reference: " + s);
}
/* Compute the MD5 hash of a file. */
string hashFile(string filename)
{
unsigned char hash[16];
FILE * file = fopen(filename.c_str(), "rb");
if (!file)
throw BadRefError("file `" + filename + "' does not exist");
int err = md5_stream(file, hash);
fclose(file);
if (err) throw BadRefError("cannot hash file");
return printHash(hash);
}
/* Return the directory part of the given path, i.e., everything
before the final `/'. */
string dirOf(string s)
{
unsigned int pos = s.rfind('/');
if (pos == string::npos) throw Error("invalid file name");
return string(s, 0, pos);
}
/* Return the base name of the given path, i.e., everything following
the final `/'. */
string baseNameOf(string s)
{
unsigned int pos = s.rfind('/');
if (pos == string::npos) throw Error("invalid file name");
return string(s, pos + 1);
}
string absPath(string filename, string dir = "");
bool isHash(const string & s);
void checkHash(const string & s);
string hashFile(string filename);
string dirOf(string s);
string baseNameOf(string s);
#endif /* !__UTIL_H */