* Operation `--delete-generations' to delete generations of a
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:
parent
c16be6ac92
commit
dcc433de47
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@ -155,10 +155,8 @@ static void initAndRun(int argc, char * * argv)
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else if (arg == "--max-jobs" || arg == "-j") {
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++i;
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if (i == args.end()) throw UsageError("`--max-jobs' requires an argument");
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istringstream str(*i);
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int n;
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str >> n;
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if (!str || !str.eof() || n < 0)
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if (!string2Int(*i, n) || n < 0)
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throw UsageError(format("`--max-jobs' requires a non-negative integer"));
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maxBuildJobs = n;
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}
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@ -616,3 +616,11 @@ bool statusOk(int status)
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{
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return WIFEXITED(status) && WEXITSTATUS(status) == 0;
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}
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bool string2Int(const string & s, int & n)
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{
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istringstream str(s);
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str >> n;
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return str && str.eof();
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}
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@ -246,6 +246,10 @@ string statusToString(int status);
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bool statusOk(int status);
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/* Parse a string into an integer. */
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bool string2Int(const string & s, int & n);
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/* !!! HACK HACK HACK - this should be in shared.hh, but it's to
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facilitate a quick hack - will remove this eventually (famous last
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words). */
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@ -643,10 +643,8 @@ static void opSwitchGeneration(Globals & globals,
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if (opArgs.size() != 1)
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throw UsageError(format("exactly one argument expected"));
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istringstream str(opArgs.front());
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int dstGen;
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str >> dstGen;
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if (!str || !str.eof())
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if (!string2Int(opArgs.front(), dstGen))
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throw UsageError(format("expected a generation number"));
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switchGeneration(globals, dstGen);
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@ -688,6 +686,49 @@ static void opListGenerations(Globals & globals,
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}
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static void deleteGeneration2(const Path & profile, unsigned int gen)
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{
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printMsg(lvlInfo, format("removing generation %1%") % gen);
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deleteGeneration(profile, gen);
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}
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static void opDeleteGenerations(Globals & globals,
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Strings opFlags, Strings opArgs)
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{
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if (opFlags.size() > 0)
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throw UsageError(format("unknown flag `%1%'") % opFlags.front());
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int curGen;
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Generations gens = findGenerations(globals.profile, curGen);
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for (Strings::iterator i = opArgs.begin(); i != opArgs.end(); ++i) {
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if (*i == "old") {
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for (Generations::iterator j = gens.begin(); j != gens.end(); ++j)
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if (j->number != curGen)
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deleteGeneration2(globals.profile, j->number);
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}
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else {
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int n;
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if (!string2Int(*i, n) || n < 0)
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throw UsageError(format("invalid generation specifier `%1%'") % *i);
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bool found = false;
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for (Generations::iterator j = gens.begin(); j != gens.end(); ++j) {
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if (j->number == n) {
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deleteGeneration2(globals.profile, j->number);
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found = true;
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break;
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}
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}
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if (!found)
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printMsg(lvlError, format("generation %1% does not exist") % n);
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}
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}
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}
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static void opDefaultExpr(Globals & globals,
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Strings opFlags, Strings opArgs)
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{
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@ -750,6 +791,8 @@ void run(Strings args)
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op = opRollback;
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else if (arg == "--list-generations")
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op = opListGenerations;
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else if (arg == "--delete-generations")
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op = opDeleteGenerations;
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else if (arg == "--dry-run") {
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printMsg(lvlInfo, "(dry run; not doing anything)");
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globals.dryRun = true;
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@ -56,20 +56,10 @@ static string nextComponent(string::const_iterator & p,
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}
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#include <fstream>
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static bool parseInt(const string & s, int & n)
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{
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istringstream st(s);
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st >> n;
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return !st.fail();
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}
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static bool componentsLT(const string & c1, const string & c2)
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{
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int n1, n2;
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bool c1Num = parseInt(c1, n1), c2Num = parseInt(c2, n2);
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bool c1Num = string2Int(c1, n1), c2Num = string2Int(c2, n2);
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if (c1Num && c2Num) return n1 < n2;
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else if (c1 == "" && c2Num) return true;
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@ -20,9 +20,11 @@ static int parseName(const string & profileName, const string & name)
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string s = string(name, profileName.size() + 1);
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int p = s.find("-link");
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if (p == string::npos) return -1;
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istringstream str(string(s, 0, p));
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unsigned int n;
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if (str >> n && str.eof()) return n; else return -1;
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int n;
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if (string2Int(string(s, 0, p), n) && n >= 0)
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return n;
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else
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return -1;
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}
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@ -59,6 +61,16 @@ Generations findGenerations(Path profile, int & curGen)
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}
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static void makeNames(const Path & profile, unsigned int num,
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Path & generation, Path & gcrootDrv, Path & gcrootClr)
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{
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Path prefix = (format("%1%-%2%") % profile % num).str();
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generation = prefix + "-link";
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gcrootDrv = prefix + "-drv.gcroot";
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gcrootClr = prefix + "-clr.gcroot";
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}
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Path createGeneration(Path profile, Path outPath,
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Path drvPath, Path clrPath)
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{
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Path generation, gcrootDrv, gcrootClr;
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while (1) {
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Path prefix = (format("%1%-%2%") % profile % num).str();
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generation = prefix + "-link";
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gcrootDrv = prefix + "-drv.gcroot";
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gcrootClr = prefix + "-clr.gcroot";
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makeNames(profile, num, generation, gcrootDrv, gcrootClr);
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if (symlink(outPath.c_str(), generation.c_str()) == 0) break;
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if (errno != EEXIST)
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throw SysError(format("creating symlink `%1%'") % generation);
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@ -90,6 +99,23 @@ Path createGeneration(Path profile, Path outPath,
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}
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static void removeFile(const Path & path)
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{
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if (remove(path.c_str()) == -1)
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throw SysError(format("cannot unlink `%1%'") % path);
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}
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void deleteGeneration(const Path & profile, unsigned int gen)
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{
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Path generation, gcrootDrv, gcrootClr;
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makeNames(profile, gen, generation, gcrootDrv, gcrootClr);
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removeFile(generation);
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if (pathExists(gcrootClr)) removeFile(gcrootClr);
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if (pathExists(gcrootDrv)) removeFile(gcrootDrv);
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}
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void switchLink(Path link, Path target)
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{
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/* Hacky. */
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@ -31,6 +31,8 @@ Generations findGenerations(Path profile, int & curGen);
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Path createGeneration(Path profile, Path outPath,
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Path drvPath, Path clrPath);
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void deleteGeneration(const Path & profile, unsigned int gen);
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void switchLink(Path link, Path target);
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@ -1,5 +1,4 @@
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#include <iostream>
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#include <sstream>
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#include "globals.hh"
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#include "normalise.hh"
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getline(cin, sub.program);
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string s;
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getline(cin, s);
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istringstream st(s);
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int n;
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st >> n;
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if (!st) throw Error("number expected");
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if (!string2Int(s, n)) throw Error("number expected");
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while (n--) {
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getline(cin, s);
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sub.args.push_back(s);
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else if (*i == "--print-dead") subOp = soPrintDead;
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else if (*i == "--delete") subOp = soDelete;
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else if (*i == "--min-age") {
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if (opArgs.size() == 0)
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throw UsageError("`--min-age' requires an argument");
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istringstream st(opArgs.front());
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st >> minAge;
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if (!st) throw Error("number expected");
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int n;
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if (opArgs.size() == 0 || !string2Int(opArgs.front(), n))
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throw UsageError("`--min-age' requires an integer argument");
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minAge = n;
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}
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else throw UsageError(format("bad sub-operation `%1%' in GC") % *i);
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