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* Operation `--delete-generations' to delete generations of a

Browse source 
profile.  Arguments are either generation number, or `old' to delete
  all non-current generations.  Typical use:

  $ nix-env --delete-generations old
  $ nix-collect-garbage

* istringstream -> string2Int.
This commit is contained in:
Eelco Dolstra 2004-09-10 13:32:08 +00:00
parent c16be6ac92
commit dcc433de47
8 changed files with 100 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

40
src/nix-env/profiles.cc
View file

@ -20,9 +20,11 @@ static int parseName(const string & profileName, const string & name)
string s = string(name, profileName.size() + 1);
int p = s.find("-link");
if (p == string::npos) return -1;
istringstream str(string(s, 0, p));
unsigned int n;
if (str >> n && str.eof()) return n; else return -1;
int n;
if (string2Int(string(s, 0, p), n) && n >= 0)
return n;
else
return -1;
}
@ -59,6 +61,16 @@ Generations findGenerations(Path profile, int & curGen)
}
static void makeNames(const Path & profile, unsigned int num,
Path & generation, Path & gcrootDrv, Path & gcrootClr)
{
Path prefix = (format("%1%-%2%") % profile % num).str();
generation = prefix + "-link";
gcrootDrv = prefix + "-drv.gcroot";
gcrootClr = prefix + "-clr.gcroot";
}
Path createGeneration(Path profile, Path outPath,
Path drvPath, Path clrPath)
{
@ -72,10 +84,7 @@ Path createGeneration(Path profile, Path outPath,
Path generation, gcrootDrv, gcrootClr;
while (1) {
Path prefix = (format("%1%-%2%") % profile % num).str();
generation = prefix + "-link";
gcrootDrv = prefix + "-drv.gcroot";
gcrootClr = prefix + "-clr.gcroot";
makeNames(profile, num, generation, gcrootDrv, gcrootClr);
if (symlink(outPath.c_str(), generation.c_str()) == 0) break;
if (errno != EEXIST)
throw SysError(format("creating symlink `%1%'") % generation);
@ -90,6 +99,23 @@ Path createGeneration(Path profile, Path outPath,
}
static void removeFile(const Path & path)
{
if (remove(path.c_str()) == -1)
throw SysError(format("cannot unlink `%1%'") % path);
}
void deleteGeneration(const Path & profile, unsigned int gen)
{
Path generation, gcrootDrv, gcrootClr;
makeNames(profile, gen, generation, gcrootDrv, gcrootClr);
removeFile(generation);
if (pathExists(gcrootClr)) removeFile(gcrootClr);
if (pathExists(gcrootDrv)) removeFile(gcrootDrv);
}
void switchLink(Path link, Path target)
{
/* Hacky. */