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#pragma once

#include "types.hh"


namespace nix {


/* Open (possibly create) a lock file and return the file descriptor.
   -1 is returned if create is false and the lock could not be opened
   because it doesn't exist.  Any other error throws an exception. */
int openLockFile(const Path & path, bool create);

/* Delete an open lock file. */
void deleteLockFile(const Path & path, int fd);

enum LockType { ltRead, ltWrite, ltNone };

bool lockFile(int fd, LockType lockType, bool wait);


class PathLocks 
{
private:
    typedef std::pair<int, Path> FDPair;
    list<FDPair> fds;
    bool deletePaths;

public:
    PathLocks();
    PathLocks(const PathSet & paths,
        const string & waitMsg = "");
    bool lockPaths(const PathSet & _paths,
        const string & waitMsg = "",
        bool wait = true);
    ~PathLocks();
    void unlock();
    void setDeletion(bool deletePaths);
};


bool pathIsLockedByMe(const Path & path);


}
able without KVM. For all these reasons, add support for host image generation. This implies the use new image generation mechanisms. - Raw disk images: images of partitions are created using tools such as mke2fs and mkdosfs depending on the partition file-system type. The partition images are then assembled into a final image using genimage. - ISO9660 images: the ISO root directory is populated within the store. GNU xorriso is then called on that directory, in the exact same way as this is done in (gnu build vm) module. Those mechanisms are built upon the new (gnu image) module. * gnu/image.scm: New file. * gnu/system/image.scm: New file. * gnu/build/image: New file. * gnu/local.mk: Add them. * gnu/system/vm.scm (system-disk-image): Rename to system-disk-image-in-vm. * gnu/ci.scm (qemu-jobs): Adapt to new API. * gnu/tests/install.scm (run-install): Ditto. * guix/scripts/system.scm (system-derivation-for-action): Ditto. Mathieu Othacehe 2020-05-05build: install: Do not set store GID....There's no need to set the store GID as is will be done by the guix-daemon, with the following snippet: if (chown(chrootStoreDir.c_str(), 0, buildUser.getGID()) == -1) throw SysError(format("cannot change ownership of ‘%1%’") % chrootStoreDir); * gnu/build/install.scm (directives): Do not set store GID. Mathieu Othacehe 2020-05-05build: install: Ignore chown exceptions....Changing ownership may require root permissions. As image can now be generated without root permissions (no VM involved), ignore those exceptions. * gnu/build/install.scm (evaluate-populate-directive): Ignore chown exceptions. Mathieu Othacehe 2020-04-11install: 'populate-root-file-system' can be passed extra directives....* gnu/build/install.scm (evaluate-populate-directive): Handle 'file' directives. (populate-root-file-system): Add #:extras parameter and honor it. Ludovic Courtès