File Manager

X7ROOT File Manager

Current Path: /usr/sbin

📁 ..
📄 NetworkManager(3.41 MB)
📄 accessdb(12.59 KB)
📄 accton(13.69 KB)
📄 adcli(179.27 KB)
📄 addgnupghome(3 KB)
📄 addpart(24.86 KB)
📄 adduser(148.17 KB)
📄 agetty(62.38 KB)
📄 alternatives(36.66 KB)
📄 anacron(40.99 KB)
📄 apachectl(4.52 KB)
📄 applygnupgdefaults(2.17 KB)
📄 arp(64.71 KB)
📄 arpd(109.52 KB)
📄 arping(28.74 KB)
📄 atd(32.63 KB)
📄 atopacctd(25.29 KB)
📄 atrun(67 B)
📄 auditctl(45.04 KB)
📄 auditd(151.73 KB)
📄 augenrules(4.04 KB)
📄 aureport(122.35 KB)
📄 ausearch(130.36 KB)
📄 authconfig(21.54 KB)
📄 autrace(16.54 KB)
📄 avcstat(16.4 KB)
📄 badblocks(32.59 KB)
📄 biosdecode(21.45 KB)
📄 biosdevname(46.16 KB)
📄 blkdeactivate(15.97 KB)
📄 blkdiscard(29.05 KB)
📄 blkid(98.66 KB)
📄 blkmapd(53.47 KB)
📄 blkzone(49.74 KB)
📄 blockdev(41.3 KB)
📄 bpftool(2.74 MB)
📄 bridge(158.25 KB)
📄 build-locale-archive(841.02 KB)
📄 cache_check(1.43 MB)
📄 cache_dump(1.43 MB)
📄 cache_metadata_size(1.43 MB)
📄 cache_repair(1.43 MB)
📄 cache_restore(1.43 MB)
📄 cache_writeback(1.43 MB)
📄 capsh(32.44 KB)
📄 cfdisk(98.4 KB)
📄 chcpu(28.84 KB)
📄 chgpasswd(69.69 KB)
📄 chkconfig(45.11 KB)
📄 chpasswd(61.42 KB)
📄 chronyd(375.66 KB)
📄 chroot(41.52 KB)
📄 clock(65.22 KB)
📄 clockdiff(20.43 KB)
📄 consoletype(11.85 KB)
📄 convertquota(78.68 KB)
📄 cracklib-check(13.05 KB)
📄 cracklib-format(251 B)
📄 cracklib-packer(13.05 KB)
📄 cracklib-unpacker(9.03 KB)
📄 create-cracklib-dict(990 B)
📄 crond(73.94 KB)
📄 cryptsetup(147.42 KB)
📄 csf(245.1 KB)
📄 ctrlaltdel(24.79 KB)
📄 ctstat(25.33 KB)
📄 dcb(155.04 KB)
📄 ddns-confgen(20.46 KB)
📄 debugfs(231.63 KB)
📄 delpart(24.86 KB)
📄 depmod(159.95 KB)
📄 devlink(215.87 KB)
📄 dhclient(453.68 KB)
📄 dhclient-script(32.86 KB)
📄 dmeventd(45.08 KB)
📄 dmfilemapd(24.55 KB)
📄 dmidecode(141.8 KB)
📄 dmsetup(158.64 KB)
📄 dmstats(158.64 KB)
📄 dnssec-checkds(936 B)
📄 dnssec-coverage(938 B)
📄 dnssec-dsfromkey(60.84 KB)
📄 dnssec-importkey(60.84 KB)
📄 dnssec-keyfromlabel(64.76 KB)
📄 dnssec-keygen(72.84 KB)
📄 dnssec-keymgr(934 B)
📄 dnssec-revoke(56.74 KB)
📄 dnssec-settime(60.84 KB)
📄 dnssec-signzone(117.2 KB)
📄 dnssec-verify(52.84 KB)
📄 dosfsck(65.13 KB)
📄 dosfslabel(61.1 KB)
📄 dovecot(137.48 KB)
📄 dovecot_cpshutdown(3.27 KB)
📄 dpkg-fsys-usrunmess(12.11 KB)
📄 dump-acct(29.15 KB)
📄 dump-utmp(25.02 KB)
📄 dumpe2fs(32.52 KB)
📄 e2freefrag(16.42 KB)
📄 e2fsck(328.52 KB)
📄 e2image(36.61 KB)
📄 e2label(110.63 KB)
📄 e2mmpstatus(32.52 KB)
📄 e2undo(20.38 KB)
📄 e4crypt(24.55 KB)
📄 e4defrag(28.49 KB)
📄 ebtables(220.8 KB)
📄 ebtables-restore(220.8 KB)
📄 ebtables-save(220.8 KB)
📄 edquota(91.24 KB)
📄 era_check(1.43 MB)
📄 era_dump(1.43 MB)
📄 era_invalidate(1.43 MB)
📄 era_restore(1.43 MB)
📄 ether-wake(73.99 KB)
📄 ethtool(557.79 KB)
📄 exicyclog(11.1 KB)
📄 exigrep(10.52 KB)
📄 exim(1.49 MB)
📄 exim_checkaccess(4.83 KB)
📄 exim_dbmbuild(23.23 KB)
📄 exim_dumpdb(38.02 KB)
📄 exim_fixdb(47.56 KB)
📄 exim_lock(26.59 KB)
📄 exim_tidydb(42.35 KB)
📄 eximstats(148.26 KB)
📄 exinext(7.14 KB)
📄 exiqgrep(5.66 KB)
📄 exiqsumm(5.32 KB)
📄 exiwhat(4.42 KB)
📄 exportfs(82.38 KB)
📄 faillock(20.52 KB)
📄 fatlabel(61.1 KB)
📄 fcgistarter(17.11 KB)
📄 fdformat(33.17 KB)
📄 fdisk(130.92 KB)
📄 filefrag(16.47 KB)
📄 findfs(12.37 KB)
📄 firewalld(6.92 KB)
📄 fix-info-dir(7.84 KB)
📄 fixfiles(10.48 KB)
📄 fsadm(24 KB)
📄 fsck(53.47 KB)
📄 fsck.cramfs(41.4 KB)
📄 fsck.ext2(328.52 KB)
📄 fsck.ext3(328.52 KB)
📄 fsck.ext4(328.52 KB)
📄 fsck.fat(65.13 KB)
📄 fsck.minix(98.74 KB)
📄 fsck.msdos(65.13 KB)
📄 fsck.vfat(65.13 KB)
📄 fsck.xfs(1.92 KB)
📄 fsfreeze(16.38 KB)
📄 fstrim(49.6 KB)
📄 fuse2fs(70.39 KB)
📄 fuser(38.14 KB)
📄 g13-syshelp(189.71 KB)
📄 genhomedircon(29.27 KB)
📄 genhostid(11.85 KB)
📄 genl(121.41 KB)
📄 genrandom(12.38 KB)
📄 getcap(12.34 KB)
📄 getenforce(7.84 KB)
📄 getpcaps(12.27 KB)
📄 getsebool(11.88 KB)
📄 groupadd(95.34 KB)
📄 groupdel(91.09 KB)
📄 groupmems(61.48 KB)
📄 groupmod(99.37 KB)
📄 grpck(61.48 KB)
📄 grpconv(57.26 KB)
📄 grpunconv(57.25 KB)
📄 grub2-bios-setup(1.16 MB)
📄 grub2-get-kernel-settings(2.68 KB)
📄 grub2-install(1.44 MB)
📄 grub2-macbless(1.14 MB)
📄 grub2-mkconfig(8.68 KB)
📄 grub2-ofpathname(242.26 KB)
📄 grub2-probe(1.16 MB)
📄 grub2-reboot(3.99 KB)
📄 grub2-rpm-sort(279.16 KB)
📄 grub2-set-bootflag(16.34 KB)
📄 grub2-set-default(3.45 KB)
📄 grub2-set-password(3.05 KB)
📄 grub2-setpassword(3.05 KB)
📄 grub2-sparc64-setup(1.16 MB)
📄 grub2-switch-to-blscfg(8.6 KB)
📄 grubby(260 B)
📄 gss-server(24.62 KB)
📄 gssproxy(132.08 KB)
📄 halt(218.45 KB)
📄 hardlink(17.09 KB)
📄 hdparm(131.91 KB)
📄 htcacheclean(44.36 KB)
📄 httpd(990.57 KB)
📄 hwclock(65.22 KB)
📄 iconvconfig(33.05 KB)
📄 ifconfig(80.86 KB)
📄 ifdown(2.07 KB)
📄 ifenslave(24.95 KB)
📄 ifstat(117.67 KB)
📄 iftop(75.42 KB)
📄 ifup(5.33 KB)
📄 imunify-notifier(9.82 MB)
📄 init(1.53 MB)
📄 insmod(159.95 KB)
📄 install-info(50.23 KB)
📄 installkernel(323 B)
📄 intel_sdsi(15.62 KB)
📄 iotop(511 B)
📄 ip(693.3 KB)
📄 ip6tables(220.8 KB)
📄 ip6tables-apply(6.89 KB)
📄 ip6tables-restore(220.8 KB)
📄 ip6tables-restore-translate(220.8 KB)
📄 ip6tables-save(220.8 KB)
📄 ip6tables-translate(220.8 KB)
📄 ipmaddr(21 KB)
📄 iprconfig(408.03 KB)
📄 iprdbg(137.57 KB)
📄 iprdump(129.3 KB)
📄 iprinit(125.28 KB)
📄 iprsos(2.18 KB)
📄 iprupdate(129.3 KB)
📄 ipset(9.01 KB)
📄 iptables(220.8 KB)
📄 iptables-apply(6.89 KB)
📄 iptables-restore(220.8 KB)
📄 iptables-restore-translate(220.8 KB)
📄 iptables-save(220.8 KB)
📄 iptables-translate(220.8 KB)
📄 iptstate(92.05 KB)
📄 iptunnel(25 KB)
📄 irqbalance(62.28 KB)
📄 irqbalance-ui(41.29 KB)
📄 isc-hmac-fixup(11.85 KB)
📄 iscsi-iname(16.42 KB)
📄 iscsiadm(406.38 KB)
📄 iscsid(419.23 KB)
📄 iscsistart(374.54 KB)
📄 iscsiuio(183.51 KB)
📄 kexec(194.98 KB)
📄 key.dns_resolver(24.52 KB)
📄 kpartx(49.05 KB)
📄 kpatch(16.59 KB)
📄 lchage(16.41 KB)
📄 ldattach(32.99 KB)
📄 ldconfig(986.02 KB)
📄 ledctl(101.16 KB)
📄 ledmon(101.11 KB)
📄 lfd(382.45 KB)
📄 lgroupadd(11.88 KB)
📄 lgroupdel(11.88 KB)
📄 lgroupmod(19.88 KB)
📄 lid(16.27 KB)
📄 lnewusers(19.87 KB)
📄 lnstat(25.33 KB)
📄 load_policy(12.28 KB)
📄 logrotate(93.03 KB)
📄 logsave(16.41 KB)
📄 losetup(90.59 KB)
📄 lpasswd(20.35 KB)
📄 lshw(966.2 KB)
📄 lsmod(159.95 KB)
📄 lspci(94.85 KB)
📄 luseradd(19.88 KB)
📄 luserdel(15.88 KB)
📄 lusermod(19.88 KB)
📄 lvchange(2.61 MB)
📄 lvconvert(2.61 MB)
📄 lvcreate(2.61 MB)
📄 lvdisplay(2.61 MB)
📄 lvextend(2.61 MB)
📄 lvm(2.61 MB)
📄 lvm_import_vdo(23.14 KB)
📄 lvmconfig(2.61 MB)
📄 lvmdevices(2.61 MB)
📄 lvmdiskscan(2.61 MB)
📄 lvmdump(10.12 KB)
📄 lvmpolld(200.69 KB)
📄 lvmsadc(2.61 MB)
📄 lvmsar(2.61 MB)
📄 lvreduce(2.61 MB)
📄 lvremove(2.61 MB)
📄 lvrename(2.61 MB)
📄 lvresize(2.61 MB)
📄 lvs(2.61 MB)
📄 lvscan(2.61 MB)
📄 lwresd(840.86 KB)
📄 makedumpfile(425.19 KB)
📄 mariadbd(24.3 MB)
📄 matchpathcon(12.37 KB)
📄 mcelog(206.3 KB)
📄 mdadm(620.63 KB)
📄 mdmon(375.48 KB)
📄 mii-diag(25.4 KB)
📄 mii-tool(21.03 KB)
📄 mkdict(251 B)
📄 mkdosfs(39.07 KB)
📄 mkdumprd(12.68 KB)
📄 mke2fs(138.45 KB)
📄 mkfadumprd(2.23 KB)
📄 mkfs(16.47 KB)
📄 mkfs.cramfs(41.26 KB)
📄 mkfs.ext2(138.45 KB)
📄 mkfs.ext3(138.45 KB)
📄 mkfs.ext4(138.45 KB)
📄 mkfs.fat(39.07 KB)
📄 mkfs.minix(86.55 KB)
📄 mkfs.msdos(39.07 KB)
📄 mkfs.vfat(39.07 KB)
📄 mkfs.xfs(475.98 KB)
📄 mkhomedir_helper(24.43 KB)
📄 mklost+found(11.86 KB)
📄 mksquashfs(186.83 KB)
📄 mkswap(86.47 KB)
📄 modinfo(159.95 KB)
📄 modprobe(159.95 KB)
📄 modsec-sdbm-util(25.83 KB)
📄 mount.nfs(197.24 KB)
📄 mount.nfs4(197.24 KB)
📄 mountstats(42.22 KB)
📄 mpathconf(16.17 KB)
📄 mpathpersist(29.34 KB)
📄 mtr(110.92 KB)
📄 mtr-packet(58.3 KB)
📄 multipath(32.61 KB)
📄 multipathd(134.76 KB)
📄 mysqld(24.3 MB)
📄 named(840.86 KB)
📄 named-checkconf(36.77 KB)
📄 named-checkzone(36.63 KB)
📄 named-compilezone(36.63 KB)
📄 named-journalprint(11.85 KB)
📄 nameif(16.98 KB)
📄 newusers(107.23 KB)
📄 nfsconf(37.48 KB)
📄 nfsconvert(13.03 KB)
📄 nfsdcld(65.87 KB)
📄 nfsdclddb(10 KB)
📄 nfsdclnts(9.02 KB)
📄 nfsdcltrack(49.78 KB)
📄 nfsidmap(45.36 KB)
📄 nfsiostat(23.36 KB)
📄 nfsref(65.8 KB)
📄 nfsstat(35.52 KB)
📄 nft(24.41 KB)
📄 nginx(1.85 MB)
📄 nginx-debug(1.98 MB)
📄 nologin(11.87 KB)
📄 nrpe(76.13 KB)
📄 nscd(160.68 KB)
📄 nsec3hash(12.29 KB)
📄 nstat(113.57 KB)
📄 nvme(721.45 KB)
📄 oddjobd(77.63 KB)
📄 ownership(12.4 KB)
📄 packer(13.05 KB)
📄 pam_console_apply(45.2 KB)
📄 pam_timestamp_check(11.87 KB)
📄 paperconfig(4.07 KB)
📄 parted(85.6 KB)
📄 partprobe(16.39 KB)
📄 partx(94.5 KB)
📄 pdata_tools(1.43 MB)
📄 pidof(16.7 KB)
📄 ping(66.13 KB)
📄 ping6(66.13 KB)
📄 pivot_root(12.38 KB)
📄 plipconfig(12.71 KB)
📄 plymouth-set-default-theme(6.05 KB)
📄 plymouthd(141.97 KB)
📄 poweroff(218.45 KB)
📄 pure-authd(19.23 KB)
📄 pure-certd(19.13 KB)
📄 pure-config.pl(4.64 KB)
📄 pure-ftpd(182.06 KB)
📄 pure-ftpwho(26.82 KB)
📄 pure-mrtginfo(11.16 KB)
📄 pure-quotacheck(18.81 KB)
📄 pure-uploadscript(19.07 KB)
📄 pvchange(2.61 MB)
📄 pvck(2.61 MB)
📄 pvcreate(2.61 MB)
📄 pvdisplay(2.61 MB)
📄 pvmove(2.61 MB)
📄 pvremove(2.61 MB)
📄 pvresize(2.61 MB)
📄 pvs(2.61 MB)
📄 pvscan(2.61 MB)
📄 pwck(57.27 KB)
📄 pwconv(53.1 KB)
📄 pwhistory_helper(20.43 KB)
📄 pwunconv(53.13 KB)
📄 quot(78.67 KB)
📄 quotacheck(115.75 KB)
📄 quotaoff(83.16 KB)
📄 quotaon(83.16 KB)
📄 quotastats(16.54 KB)
📄 raid-check(3.7 KB)
📄 rcmysql(0 B)
📄 rdisc(24.55 KB)
📄 rdma(187.38 KB)
📄 readprofile(20.55 KB)
📄 realm(144.26 KB)
📄 reboot(218.45 KB)
📄 repquota(83.24 KB)
📄 request-key(24.38 KB)
📄 resize2fs(64.91 KB)
📄 resizepart(41.56 KB)
📄 resolvconf(195.74 KB)
📄 restorecon(20.53 KB)
📄 restorecon_xattr(16.41 KB)
📄 rfkill(53.46 KB)
📄 rmmod(159.95 KB)
📄 rndc(36.53 KB)
📄 rndc-confgen(20.45 KB)
📄 rotatelogs(30.51 KB)
📄 route(67.63 KB)
📄 rpc.gssd(106.55 KB)
📄 rpc.idmapd(61.73 KB)
📄 rpc.mountd(158.92 KB)
📄 rpc.nfsd(49.91 KB)
📄 rpc.statd(103.29 KB)
📄 rpcbind(61.55 KB)
📄 rpcctl(9.41 KB)
📄 rpcdebug(19.38 KB)
📄 rpcinfo(32.64 KB)
📄 rsyslogd(724.73 KB)
📄 rtacct(46.94 KB)
📄 rtcwake(49.31 KB)
📄 rtmon(117.27 KB)
📄 rtstat(25.33 KB)
📄 runlevel(218.45 KB)
📄 runq(1.49 MB)
📄 runuser(48.99 KB)
📄 sa(46.62 KB)
📄 sasldblistusers2(20.77 KB)
📄 saslpasswd2(16.42 KB)
📄 sefcontext_compile(65.35 KB)
📄 selabel_digest(12.28 KB)
📄 selabel_lookup(12.27 KB)
📄 selabel_lookup_best_match(11.89 KB)
📄 selabel_partial_match(11.88 KB)
📄 selinux_check_access(12.36 KB)
📄 selinuxconlist(11.88 KB)
📄 selinuxdefcon(11.88 KB)
📄 selinuxenabled(7.84 KB)
📄 selinuxexeccon(11.86 KB)
📄 semodule(29.27 KB)
📄 sendmail(16.91 KB)
📄 service(3.64 KB)
📄 sestatus(20.41 KB)
📄 setcap(16.27 KB)
📄 setenforce(12.27 KB)
📄 setfiles(20.53 KB)
📄 setpci(28.56 KB)
📄 setquota(91.38 KB)
📄 setsebool(16.38 KB)
📄 sfdisk(118.5 KB)
📄 showmount(21.06 KB)
📄 shutdown(218.45 KB)
📄 sim_server(11.87 KB)
📄 slattach(43.76 KB)
📄 sm-notify(78.14 KB)
📄 smartctl(907.08 KB)
📄 smartd(733.2 KB)
📄 snmpd(32.45 KB)
📄 snmptrapd(32.6 KB)
📄 sos(627 B)
📄 sos-collector(139 B)
📄 sosreport(132 B)
📄 ss(191.3 KB)
📄 sshd(869.77 KB)
📄 sss_cache(61.09 KB)
📄 sssd(73.01 KB)
📄 start-statd(838 B)
📄 start-stop-daemon(45.98 KB)
📄 suexec(25.3 KB)
📄 sulogin(49.24 KB)
📄 suphp(6.56 MB)
📄 swaplabel(16.5 KB)
📄 swapoff(20.74 KB)
📄 swapon(49.4 KB)
📄 switch_root(16.49 KB)
📄 sysctl(28.88 KB)
📄 syspurpose(415 B)
📄 tcpdump(1.01 MB)
📄 tcpslice(32.63 KB)
📄 tcsd(309.72 KB)
📄 telinit(218.45 KB)
📄 thin_check(1.43 MB)
📄 thin_delta(1.43 MB)
📄 thin_dump(1.43 MB)
📄 thin_ls(1.43 MB)
📄 thin_metadata_pack(907.47 KB)
📄 thin_metadata_size(1.43 MB)
📄 thin_metadata_unpack(895.45 KB)
📄 thin_repair(1.43 MB)
📄 thin_restore(1.43 MB)
📄 thin_rmap(1.43 MB)
📄 thin_trim(1.43 MB)
📄 timedatex(33.43 KB)
📄 tipc(163.07 KB)
📄 tmpwatch(35.47 KB)
📄 tracepath(20.44 KB)
📄 tracepath6(20.44 KB)
📄 tsig-keygen(20.46 KB)
📄 tune2fs(110.63 KB)
📄 tuned(3.88 KB)
📄 tuned-adm(6.5 KB)
📄 udevadm(424.59 KB)
📄 umount.nfs(197.24 KB)
📄 umount.nfs4(197.24 KB)
📄 unbound-anchor(57.34 KB)
📄 unix_chkpwd(36.86 KB)
📄 unix_update(36.87 KB)
📄 unsquashfs(99.57 KB)
📄 update-alternatives(36.66 KB)
📄 update-pciids(1.71 KB)
📄 update-smart-drivedb(14.44 KB)
📄 useradd(148.17 KB)
📄 userdel(107.29 KB)
📄 usermod(144.07 KB)
📄 usernetctl(12.4 KB)
📄 uuserver(15.88 KB)
📄 vdpa(118.04 KB)
📄 vgcfgbackup(2.61 MB)
📄 vgcfgrestore(2.61 MB)
📄 vgchange(2.61 MB)
📄 vgck(2.61 MB)
📄 vgconvert(2.61 MB)
📄 vgcreate(2.61 MB)
📄 vgdisplay(2.61 MB)
📄 vgexport(2.61 MB)
📄 vgextend(2.61 MB)
📄 vgimport(2.61 MB)
📄 vgimportclone(2.61 MB)
📄 vgimportdevices(2.61 MB)
📄 vgmerge(2.61 MB)
📄 vgmknodes(2.61 MB)
📄 vgreduce(2.61 MB)
📄 vgremove(2.61 MB)
📄 vgrename(2.61 MB)
📄 vgs(2.61 MB)
📄 vgscan(2.61 MB)
📄 vgsplit(2.61 MB)
📄 vigr(68.05 KB)
📄 vipw(68.05 KB)
📄 virt-what(14.22 KB)
📄 visudo(239.22 KB)
📄 vmcore-dmesg(28.58 KB)
📄 vpddecode(16.47 KB)
📄 weak-modules(33.6 KB)
📄 whmapi0(3.18 MB)
📄 whmapi1(3.18 MB)
📄 whmlogin(2.33 KB)
📄 wipefs(41.11 KB)
📄 xfs_admin(1.38 KB)
📄 xfs_bmap(695 B)
📄 xfs_copy(434.59 KB)
📄 xfs_db(760.47 KB)
📄 xfs_estimate(12.39 KB)
📄 xfs_freeze(800 B)
📄 xfs_fsr(53.41 KB)
📄 xfs_growfs(422.48 KB)
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Editing: dpkg-fsys-usrunmess

#!/usr/bin/perl
#
# dpkg-fsys-usrunmess - Undoes the merged-/usr-via-aliased-dirs mess
#
# Copyright © 2020-2021 Guillem Jover <guillem@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>

use strict;
use warnings;
use feature qw(state);

our ($PROGNAME) = $0 =~ m{(?:.*/)?([^/]*)};
our $PROGVERSION = '1.20.9';
our $ADMINDIR = '/var/lib/dpkg';

use POSIX;
use Getopt::Long qw(:config posix_default bundling_values no_ignorecase);

eval q{
    pop @INC if $INC[-1] eq '.';
    use File::FcntlLock;
};
if ($@) {
    fatal('missing File::FcntlLock module; please install libfile-fcntllock-perl');
}

my $opt_noact = length $ENV{DPKG_USRUNMESS_NOACT} ? 1 : 0;
my $opt_prompt = 0;

my @options_spec = (
    'help|?' => sub { usage(); exit 0; },
    'version' => sub { version(); exit 0; },
    'dry-run|no-act|n' => \$opt_noact,
    'prompt|p' => \$opt_prompt,
);

{
    local $SIG{__WARN__} = sub { usageerr($_[0]) };
    GetOptions(@options_spec);
}

my @aliased_dirs;

#
# Scan all dirs under / and check whether any are aliased to /usr.
#

foreach my $path (glob '/*') {
    debug("checking symlink? $path");
    next unless -l $path;
    debug("checking merged-usr symlink? $path");
    my $symlink = readlink $path;
    next unless $symlink eq "usr$path" or $symlink eq "/usr$path";
    debug("merged-usr breakage, queueing $path");
    push @aliased_dirs, $path;
}

if (@aliased_dirs == 0) {
    print "System is fine, no aliased directories found, congrats!\n";
    exit 0;
}

#
# dpkg consistency checks
#

debug('checking dpkg database consistency');
system(qw(dpkg --audit)) == 0
    or fatal("cannot audit the dpkg database: $!");

debug('checking whether dpkg has been interrupted');
if (glob "$ADMINDIR/updates/*") {
    fatal('dpkg is in an inconsistent state, please fix that');
}

my $aliased_regex = '^(' . join('|', @aliased_dirs) . ')/';

#
# Get a list of all paths (including diversion) under the aliased dirs.
#

my @search_args;
my %aliased_pathnames;
foreach my $dir (@aliased_dirs) {
    push @search_args, "$dir/*";
}
open my $fh_paths, '-|', 'dpkg-query', '--search', @search_args
    or fatal("cannot execute dpkg-query --search: $!");
while (<$fh_paths>) {
    if (m/^diversion by [^ ]+ from: .*$/) {
        # Ignore.
    } elsif (m/^diversion by [^ ]+ to: (.*)$/) {
        if (-e $1) {
            add_pathname($1, 'diverted pathname');
        }
    } elsif (m/^.*: (.*)$/) {
        add_pathname($1, 'pathname');
    }
}
close $fh_paths;

#
# Get a list of all update-alternatives under the aliased dirs.
#

my @selections = qx(update-alternatives --get-selections);
foreach my $selection (@selections) {
    my $name = (split(' ', $selection))[0];
    my $slaves = 0;

open my $fh_alts, '-|', 'update-alternatives', '--query', $name
        or fatal("cannot execute update-alternatives --query: $!");
    while (<$fh_alts>) {
        if (m/^\s*$/) {
            last;
        } elsif (m/^Link: (.*)$/) {
            add_pathname($1, 'alternative link');
        } elsif (m/^Slaves:\s*$/) {
            $slaves = 1;
        } elsif ($slaves and m/^\s\S+\s(\S+)$/) {
            add_pathname($1, 'alternative slave');
        } else {
            $slaves = 0;
        }
    }
    close $fh_alts;
}

my $sroot = '/.usrunmess';
my @relabel;

#
# Create a shadow hierarchy under / for the new unmessed dir:
#

debug("creating shadow dir = $sroot");
mkdir $sroot
    or sysfatal("cannot create directory $sroot");
foreach my $dir (@aliased_dirs) {
    debug("creating shadow dir = $sroot$dir");
    mkdir "$sroot$dir"
        or sysfatal("cannot create directory $sroot$dir");
    push @relabel, "$sroot$dir";
}

#
# Populate the split dirs with hardlinks or copies of the objects from
# their counter-parts in /usr.
#

foreach my $pathname (sort keys %aliased_pathnames) {
    my (@meta) = lstat $pathname
        or sysfatal("cannot lstat object $pathname for shadow hierarchy");

if (-d _) {
        my $mode = $meta[2];
        my ($uid, $gid) = @meta[4, 5];
        my ($atime, $mtime, $ctime) = @meta[8, 9, 10];

debug("creating shadow dir = $sroot$pathname");
        mkdir "$sroot$pathname"
            or sysfatal("cannot mkdir $sroot$pathname");
        chmod $mode, "$sroot$pathname"
            or sysfatal("cannot chmod $mode $sroot$pathname");
        chown $uid, $gid, "$sroot$pathname"
            or sysfatal("cannot chown $uid $gid $sroot$pathname");
        utime $atime, $mtime, "$sroot$pathname"
            or sysfatal("cannot utime $atime $mtime $sroot$pathname");
        push @relabel, "$sroot$pathname";
    } elsif (-f _) {
        debug("creating shadow file = $sroot$pathname");
        copy("/usr$pathname", "$sroot$pathname");
    } elsif (-l _) {
        my $target = readlink "/usr$pathname";

debug("creating shadow symlink = $sroot$pathname");
        symlink $target, "$sroot$pathname"
            or sysfatal("cannot symlink $target to $sroot$pathname");
        push @relabel, "$sroot$pathname";
    } else {
        fatal("unhandled object type for '$pathname'");
    }
}

#
# Prompt at the point of no return, if the user requested it.
#

if ($opt_prompt) {
    print "Shadow hierarchy created at '$sroot', ready to proceed (y/N)? ";
    my $reply = <STDIN>;
    chomp $reply;

if ($reply ne 'y' and $reply ne 'yes') {
        print "Aborting migration, shadow hierarchy left in place.\n";
        exit 0;
    }
}

#
# Mark all packages as half-configured so that we can force a mass
# reconfiguration, to trigger any code in maintainer scripts that might
# create files.
#
# XXX: We do this manually by editing the status file.
# XXX: We do this for packages that might not have maintscripts, or might
#      not involve affected directories.
#

debug('marking all dpkg packages as half-configured');
if (not $opt_noact) {
    open my $fh_lock, '>', "$ADMINDIR/lock"
        or sysfatal('cannot open dpkg database lock file');
    my $fs = File::FcntlLock->new(l_type => F_WRLCK);
    $fs->lock($fh_lock, F_SETLKW)
        or sysfatal('cannot get a write lock on dpkg database');

my $file_db = "$ADMINDIR/status";
    my $file_dbnew = $file_db . '.new';

open my $fh_dbnew, '>', $file_dbnew
        or sysfatal('cannot open new dpkg database');
    open my $fh_db, '<', $file_db
        or sysfatal('cannot open dpkg database');
    while (<$fh_db>) {
        if (m/^Status: /) {
            s/ installed$/ half-configured/;
        }
        print { $fh_dbnew } $_;
    }
    close $fh_db;
    $fh_dbnew->flush() or sysfatal('cannot flush new dpkg database');
    $fh_dbnew->sync() or sysfatal('cannot fsync new dpkg database');
    close $fh_dbnew or sysfatal('cannot close new dpkg database');

rename $file_dbnew, $file_db
        or sysfatal('cannot rename new dpkg database');
}

#
# Replace things as quickly as possible:
#

foreach my $dir (@aliased_dirs) {
    debug("making dir backup = $dir.aliased");
    if (not $opt_noact) {
        rename $dir, "$dir.aliased"
            or sysfatal("cannot make backup directory $dir.aliased");
    }

debug("renaming $sroot$dir to $dir");
    if (not $opt_noact) {
        rename "$sroot$dir", $dir
            or sysfatal("cannot install fixed directory $dir");
    }
}

mac_relabel();

#
# Re-configure all packages, so that postinst maintscripts are executed.
#

debug('reconfigured all packages');
if (not $opt_noact) {
    local $ENV{DEBIAN_FRONTEND} = 'noninteractive';
    system(qw(dpkg --configure --pending)) == 0
        or fatal("cannot reconfigure packages: $!");
}

#
# Cleanup backup directories.
#

foreach my $dir (@aliased_dirs) {
    debug("removing backup = $dir.aliased");
    if (not $opt_noact) {
        unlink "$dir.aliased"
            or sysfatal("cannot cleanup backup directory $dir.aliased");
    }
}

my %deferred_dirnames;

#
# Cleanup moved objects.
#

foreach my $pathname (sort keys %aliased_pathnames) {
    my (@meta) = lstat $pathname
        or sysfatal("cannot lstat object $pathname for cleanup");

if (-d _) {
        # Skip directories as this might be shared by a proper path under the
        # aliased hierearchy. And so that we can remove them in reverse order.
        debug("deferring merged dir cleanup = /usr$pathname");
        $deferred_dirnames{"/usr$pathname"} = 1;
    } else {
        debug("cleaning up pathname = /usr$pathname");
        next if $opt_noact;
        unlink "/usr$pathname"
            or sysfatal("cannot unlink object /usr$pathname");
    }
}

#
# Cleanup deferred directories.
#

debug("cleaning up shadow deferred dir = $sroot");
my $arg_max = POSIX::sysconf(POSIX::_SC_ARG_MAX) // POSIX::_POSIX_ARG_MAX;
my @batch_dirs;
my $batch_size = 0;

foreach my $dir (keys %deferred_dirnames) {
    my $dir_size = length($dir) + 1;
    if ($batch_size + $dir_size < $arg_max) {
        $batch_size += length($dir) + 1;
        push @batch_dirs, $dir;

} else {
        next;
    }
    next if length $batch_size == 0;

open my $fh_dirs, '-|', 'dpkg-query', '--search', @batch_dirs
        or fatal("cannot execute dpkg-query --search: $!");
    while (<$fh_dirs>) {
        if (m/^.*: (.*)$/) {
            # If the directory is known by its aliased name, it should not be
            # cleaned up.
            if (exists $deferred_dirnames{$1}) {
                delete $deferred_dirnames{$1};
            }
        }
    }
    close $fh_dirs;

@batch_dirs = ();
    $batch_size = 0;
}

if (not $opt_noact) {
    foreach my $dirname (reverse sort keys %deferred_dirnames) {
        rmdir $dirname
            or sysfatal("cannot remove shadow directory $dirname");
    }
}

if (not $opt_noact) {
    debug("cleaning up shadow root dir = $sroot");
    rmdir $sroot
        or sysfatal("cannot remove shadow directory $sroot");
}

print "Done, hierarchy unmessed, congrats!\n";

print "(Note: you might need to run 'hash -r' in your shell.)\n";

##
## Functions
##

sub debug
{
    my $msg = shift;

print { \*STDERR } "D: $msg\n";
}

sub fatal
{
    my $msg = shift;

die "error: $msg\n";
}

sub sysfatal
{
    my $msg = shift;

fatal("$msg: $!");
}

sub copy
{
    my ($src, $dst) = @_;

# Try to hardlink first.
    return if link $src, $dst;

# If we are on different filesystems, try a copy.
    if ($! == POSIX::EXDEV) {
        # XXX: This will not preserve hardlinks, these would get restored
        # after the next package upgrade.
        system('cp', '-a', $src, $dst) == 0
            or fatal("cannot copy file $src to $dst: $?");
    } else {
        sysfatal("cannot link file $src to $dst");
    }
}

sub mac_relabel
{
    my $has_cmd = 0;
    foreach my $path (split /:/, $ENV{PATH}) {
        if (-x "$path/restorecon") {
            $has_cmd = 1;
            last;
        }
    }
    return unless $has_cmd;

foreach my $pathname (@relabel) {
        system('restorecon', $pathname) == 0
            or fatal("cannot restore MAC context for $pathname: $?");
    }
}

sub add_pathname
{
    my ($pathname, $origin) = @_;

if ($pathname =~ m/$aliased_regex/) {
        debug("adding $origin = $pathname");
        $aliased_pathnames{$pathname} = 1;
    }
}

sub version()
{
    printf "Debian %s version %s.\n", $PROGNAME, $PROGVERSION;
}

sub usage
{
    printf
'Usage: %s [<option>...]'
    . "\n\n" .
'Options:
  -p, --prompt      prompt before the point of no return.
  -n, --no-act      just check and create the new structure, no switch.
      --dry-run     ditto.
  -?, --help        show this help message.
      --version     show the version.'
    . "\n", $PROGNAME;
}

sub usageerr
{
    my $msg = shift;

state $printforhelp = 'Use --help for program usage information.';

$msg = sprintf $msg, @_ if @_;
    warn "$PROGNAME: error: $msg\n";
    warn "$printforhelp\n";
    exit 2;
}

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