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-rw-r--r--third_party/nix/src/libstore/profiles.cc359
1 files changed, 163 insertions, 196 deletions
diff --git a/third_party/nix/src/libstore/profiles.cc b/third_party/nix/src/libstore/profiles.cc
index 4c6af567ae6f..614153d89dd3 100644
--- a/third_party/nix/src/libstore/profiles.cc
+++ b/third_party/nix/src/libstore/profiles.cc
@@ -1,259 +1,226 @@
 #include "profiles.hh"
-#include "store-api.hh"
-#include "util.hh"
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
 #include <errno.h>
 #include <stdio.h>
-
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include "store-api.hh"
+#include "util.hh"
 
 namespace nix {
 
-
-static bool cmpGensByNumber(const Generation & a, const Generation & b)
-{
-    return a.number < b.number;
+static bool cmpGensByNumber(const Generation& a, const Generation& b) {
+  return a.number < b.number;
 }
 
-
 /* Parse a generation name of the format
    `<profilename>-<number>-link'. */
-static int parseName(const string & profileName, const string & name)
-{
-    if (string(name, 0, profileName.size() + 1) != profileName + "-") return -1;
-    string s = string(name, profileName.size() + 1);
-    string::size_type p = s.find("-link");
-    if (p == string::npos) return -1;
-    int n;
-    if (string2Int(string(s, 0, p), n) && n >= 0)
-        return n;
-    else
-        return -1;
+static int parseName(const string& profileName, const string& name) {
+  if (string(name, 0, profileName.size() + 1) != profileName + "-") return -1;
+  string s = string(name, profileName.size() + 1);
+  string::size_type p = s.find("-link");
+  if (p == string::npos) return -1;
+  int n;
+  if (string2Int(string(s, 0, p), n) && n >= 0)
+    return n;
+  else
+    return -1;
 }
 
+Generations findGenerations(Path profile, int& curGen) {
+  Generations gens;
 
+  Path profileDir = dirOf(profile);
+  string profileName = baseNameOf(profile);
 
-Generations findGenerations(Path profile, int & curGen)
-{
-    Generations gens;
-
-    Path profileDir = dirOf(profile);
-    string profileName = baseNameOf(profile);
-
-    for (auto & i : readDirectory(profileDir)) {
-        int n;
-        if ((n = parseName(profileName, i.name)) != -1) {
-            Generation gen;
-            gen.path = profileDir + "/" + i.name;
-            gen.number = n;
-            struct stat st;
-            if (lstat(gen.path.c_str(), &st) != 0)
-                throw SysError(format("statting '%1%'") % gen.path);
-            gen.creationTime = st.st_mtime;
-            gens.push_back(gen);
-        }
+  for (auto& i : readDirectory(profileDir)) {
+    int n;
+    if ((n = parseName(profileName, i.name)) != -1) {
+      Generation gen;
+      gen.path = profileDir + "/" + i.name;
+      gen.number = n;
+      struct stat st;
+      if (lstat(gen.path.c_str(), &st) != 0)
+        throw SysError(format("statting '%1%'") % gen.path);
+      gen.creationTime = st.st_mtime;
+      gens.push_back(gen);
     }
+  }
 
-    gens.sort(cmpGensByNumber);
+  gens.sort(cmpGensByNumber);
 
-    curGen = pathExists(profile)
-        ? parseName(profileName, readLink(profile))
-        : -1;
+  curGen = pathExists(profile) ? parseName(profileName, readLink(profile)) : -1;
 
-    return gens;
+  return gens;
 }
 
-
-static void makeName(const Path & profile, unsigned int num,
-    Path & outLink)
-{
-    Path prefix = (format("%1%-%2%") % profile % num).str();
-    outLink = prefix + "-link";
+static void makeName(const Path& profile, unsigned int num, Path& outLink) {
+  Path prefix = (format("%1%-%2%") % profile % num).str();
+  outLink = prefix + "-link";
 }
 
+Path createGeneration(ref<LocalFSStore> store, Path profile, Path outPath) {
+  /* The new generation number should be higher than old the
+     previous ones. */
+  int dummy;
+  Generations gens = findGenerations(profile, dummy);
 
-Path createGeneration(ref<LocalFSStore> store, Path profile, Path outPath)
-{
-    /* The new generation number should be higher than old the
-       previous ones. */
-    int dummy;
-    Generations gens = findGenerations(profile, dummy);
+  unsigned int num;
+  if (gens.size() > 0) {
+    Generation last = gens.back();
 
-    unsigned int num;
-    if (gens.size() > 0) {
-        Generation last = gens.back();
+    if (readLink(last.path) == outPath) {
+      /* We only create a new generation symlink if it differs
+         from the last one.
 
-        if (readLink(last.path) == outPath) {
-            /* We only create a new generation symlink if it differs
-               from the last one.
-
-               This helps keeping gratuitous installs/rebuilds from piling
-               up uncontrolled numbers of generations, cluttering up the
-               UI like grub. */
-            return last.path;
-        }
-
-        num = gens.back().number;
-    } else {
-        num = 0;
+         This helps keeping gratuitous installs/rebuilds from piling
+         up uncontrolled numbers of generations, cluttering up the
+         UI like grub. */
+      return last.path;
     }
 
-    /* Create the new generation.  Note that addPermRoot() blocks if
-       the garbage collector is running to prevent the stuff we've
-       built from moving from the temporary roots (which the GC knows)
-       to the permanent roots (of which the GC would have a stale
-       view).  If we didn't do it this way, the GC might remove the
-       user environment etc. we've just built. */
-    Path generation;
-    makeName(profile, num + 1, generation);
-    store->addPermRoot(outPath, generation, false, true);
-
-    return generation;
-}
+    num = gens.back().number;
+  } else {
+    num = 0;
+  }
 
+  /* Create the new generation.  Note that addPermRoot() blocks if
+     the garbage collector is running to prevent the stuff we've
+     built from moving from the temporary roots (which the GC knows)
+     to the permanent roots (of which the GC would have a stale
+     view).  If we didn't do it this way, the GC might remove the
+     user environment etc. we've just built. */
+  Path generation;
+  makeName(profile, num + 1, generation);
+  store->addPermRoot(outPath, generation, false, true);
 
-static void removeFile(const Path & path)
-{
-    if (remove(path.c_str()) == -1)
-        throw SysError(format("cannot unlink '%1%'") % path);
+  return generation;
 }
 
-
-void deleteGeneration(const Path & profile, unsigned int gen)
-{
-    Path generation;
-    makeName(profile, gen, generation);
-    removeFile(generation);
+static void removeFile(const Path& path) {
+  if (remove(path.c_str()) == -1)
+    throw SysError(format("cannot unlink '%1%'") % path);
 }
 
-
-static void deleteGeneration2(const Path & profile, unsigned int gen, bool dryRun)
-{
-    if (dryRun)
-        printInfo(format("would remove generation %1%") % gen);
-    else {
-        printInfo(format("removing generation %1%") % gen);
-        deleteGeneration(profile, gen);
-    }
+void deleteGeneration(const Path& profile, unsigned int gen) {
+  Path generation;
+  makeName(profile, gen, generation);
+  removeFile(generation);
 }
 
+static void deleteGeneration2(const Path& profile, unsigned int gen,
+                              bool dryRun) {
+  if (dryRun)
+    printInfo(format("would remove generation %1%") % gen);
+  else {
+    printInfo(format("removing generation %1%") % gen);
+    deleteGeneration(profile, gen);
+  }
+}
 
-void deleteGenerations(const Path & profile, const std::set<unsigned int> & gensToDelete, bool dryRun)
-{
-    PathLocks lock;
-    lockProfile(lock, profile);
+void deleteGenerations(const Path& profile,
+                       const std::set<unsigned int>& gensToDelete,
+                       bool dryRun) {
+  PathLocks lock;
+  lockProfile(lock, profile);
 
-    int curGen;
-    Generations gens = findGenerations(profile, curGen);
+  int curGen;
+  Generations gens = findGenerations(profile, curGen);
 
-    if (gensToDelete.find(curGen) != gensToDelete.end())
-        throw Error(format("cannot delete current generation of profile %1%'") % profile);
+  if (gensToDelete.find(curGen) != gensToDelete.end())
+    throw Error(format("cannot delete current generation of profile %1%'") %
+                profile);
 
-    for (auto & i : gens) {
-        if (gensToDelete.find(i.number) == gensToDelete.end()) continue;
-        deleteGeneration2(profile, i.number, dryRun);
-    }
+  for (auto& i : gens) {
+    if (gensToDelete.find(i.number) == gensToDelete.end()) continue;
+    deleteGeneration2(profile, i.number, dryRun);
+  }
 }
 
-void deleteGenerationsGreaterThan(const Path & profile, int max, bool dryRun)
-{
-    PathLocks lock;
-    lockProfile(lock, profile);
-
-    int curGen;
-    bool fromCurGen = false;
-    Generations gens = findGenerations(profile, curGen);
-    for (auto i = gens.rbegin(); i != gens.rend(); ++i) {
-        if (i->number == curGen) {
-            fromCurGen = true;
-            max--;
-            continue;
-        }
-        if (fromCurGen) {
-            if (max) {
-                max--;
-                continue;
-            }
-            deleteGeneration2(profile, i->number, dryRun);
-        }
+void deleteGenerationsGreaterThan(const Path& profile, int max, bool dryRun) {
+  PathLocks lock;
+  lockProfile(lock, profile);
+
+  int curGen;
+  bool fromCurGen = false;
+  Generations gens = findGenerations(profile, curGen);
+  for (auto i = gens.rbegin(); i != gens.rend(); ++i) {
+    if (i->number == curGen) {
+      fromCurGen = true;
+      max--;
+      continue;
     }
+    if (fromCurGen) {
+      if (max) {
+        max--;
+        continue;
+      }
+      deleteGeneration2(profile, i->number, dryRun);
+    }
+  }
 }
 
-void deleteOldGenerations(const Path & profile, bool dryRun)
-{
-    PathLocks lock;
-    lockProfile(lock, profile);
+void deleteOldGenerations(const Path& profile, bool dryRun) {
+  PathLocks lock;
+  lockProfile(lock, profile);
 
-    int curGen;
-    Generations gens = findGenerations(profile, curGen);
+  int curGen;
+  Generations gens = findGenerations(profile, curGen);
 
-    for (auto & i : gens)
-        if (i.number != curGen)
-            deleteGeneration2(profile, i.number, dryRun);
+  for (auto& i : gens)
+    if (i.number != curGen) deleteGeneration2(profile, i.number, dryRun);
 }
 
+void deleteGenerationsOlderThan(const Path& profile, time_t t, bool dryRun) {
+  PathLocks lock;
+  lockProfile(lock, profile);
 
-void deleteGenerationsOlderThan(const Path & profile, time_t t, bool dryRun)
-{
-    PathLocks lock;
-    lockProfile(lock, profile);
-
-    int curGen;
-    Generations gens = findGenerations(profile, curGen);
-
-    bool canDelete = false;
-    for (auto i = gens.rbegin(); i != gens.rend(); ++i)
-        if (canDelete) {
-            assert(i->creationTime < t);
-            if (i->number != curGen)
-                deleteGeneration2(profile, i->number, dryRun);
-        } else if (i->creationTime < t) {
-            /* We may now start deleting generations, but we don't
-               delete this generation yet, because this generation was
-               still the one that was active at the requested point in
-               time. */
-            canDelete = true;
-        }
-}
+  int curGen;
+  Generations gens = findGenerations(profile, curGen);
 
+  bool canDelete = false;
+  for (auto i = gens.rbegin(); i != gens.rend(); ++i)
+    if (canDelete) {
+      assert(i->creationTime < t);
+      if (i->number != curGen) deleteGeneration2(profile, i->number, dryRun);
+    } else if (i->creationTime < t) {
+      /* We may now start deleting generations, but we don't
+         delete this generation yet, because this generation was
+         still the one that was active at the requested point in
+         time. */
+      canDelete = true;
+    }
+}
 
-void deleteGenerationsOlderThan(const Path & profile, const string & timeSpec, bool dryRun)
-{
-    time_t curTime = time(0);
-    string strDays = string(timeSpec, 0, timeSpec.size() - 1);
-    int days;
+void deleteGenerationsOlderThan(const Path& profile, const string& timeSpec,
+                                bool dryRun) {
+  time_t curTime = time(0);
+  string strDays = string(timeSpec, 0, timeSpec.size() - 1);
+  int days;
 
-    if (!string2Int(strDays, days) || days < 1)
-        throw Error(format("invalid number of days specifier '%1%'") % timeSpec);
+  if (!string2Int(strDays, days) || days < 1)
+    throw Error(format("invalid number of days specifier '%1%'") % timeSpec);
 
-    time_t oldTime = curTime - days * 24 * 3600;
+  time_t oldTime = curTime - days * 24 * 3600;
 
-    deleteGenerationsOlderThan(profile, oldTime, dryRun);
+  deleteGenerationsOlderThan(profile, oldTime, dryRun);
 }
 
+void switchLink(Path link, Path target) {
+  /* Hacky. */
+  if (dirOf(target) == dirOf(link)) target = baseNameOf(target);
 
-void switchLink(Path link, Path target)
-{
-    /* Hacky. */
-    if (dirOf(target) == dirOf(link)) target = baseNameOf(target);
-
-    replaceSymlink(target, link);
+  replaceSymlink(target, link);
 }
 
-
-void lockProfile(PathLocks & lock, const Path & profile)
-{
-    lock.lockPaths({profile}, (format("waiting for lock on profile '%1%'") % profile).str());
-    lock.setDeletion(true);
+void lockProfile(PathLocks& lock, const Path& profile) {
+  lock.lockPaths({profile},
+                 (format("waiting for lock on profile '%1%'") % profile).str());
+  lock.setDeletion(true);
 }
 
-
-string optimisticLockProfile(const Path & profile)
-{
-    return pathExists(profile) ? readLink(profile) : "";
+string optimisticLockProfile(const Path& profile) {
+  return pathExists(profile) ? readLink(profile) : "";
 }
 
-
-}
+}  // namespace nix