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# build/default/490_fix_broken_links.sh # # Check for broken symbolic links inside the recovery system in ROOTFS_DIR # and add missing symlink targets to the recovery system # when the symlink target is a file (and not a directory) # see https://github.com/rear/rear/issues/1638 # and https://github.com/rear/rear/pull/1734 # FIXME: The following code fails if symlinks or their targets contain characters from IFS (e.g. blanks), # cf. the same kind of comments in build/default/990_verify_rootfs.sh # and layout/prepare/GNU/Linux/130_include_mount_subvolumes_code.sh # see https://github.com/rear/rear/pull/1514#discussion_r141031975 # and for the general issue see https://github.com/rear/rear/issues/1372 # Find broken symbolic links inside the recovery system via 'chroot $ROOTFS_DIR find / -xtype l' # (but exclude the special proc sys dev directories inside the recovery system) # because 'pushd $ROOTFS_DIR ; find . -xtype l ; popd' would not find symlinks that are broken # within the recovery system because the symlink target is outside of the recovery system, # for example $ROOTFS_DIR/etc/localtime -> /usr/share/zoneinfo/Europe/Berlin is broken # and should be $ROOTFS_DIR/etc/localtime -> $ROOTFS_DIR/usr/share/zoneinfo/Europe/Berlin # cf. https://github.com/rear/rear/pull/1734#issuecomment-434635175 # Eveny broken symlink has the form of an absolute path inside ROOTFS_DIR, for example: # /etc/localtime (e.g. with link target /usr/share/zoneinfo/Europe/Berlin) # /etc/mtab (e.g. with link target /proc/1234/mounts) # /etc/termcap (e.g. with link target /usr/share/misc/termcap) # /dir1/dir2/relative_symlink_to_file (e.g. with link target ../../path/to/file) # /dir3/relative_symlink_to_directory (e.g. with link target ../path/to/directory) local broken_symlinks=$( chroot $ROOTFS_DIR find / -xdev -path '/proc' -prune -o -path '/sys' -prune -o -path '/dev' -prune -o -xtype l -print ) # Copy missing symlink targets into the recovery system if the symlink target exists # (except the symlink target is in /proc/ /sys/ /dev/ or /run/). # Otherwise report that there is something wrong on the original system and # assume when things work sufficiently on the original system nevertheless # this is no sufficient reason to abort here (i.e. proceed "bona fide") # cf. what is done when '$lib is a symbolic link' in build/GNU/Linux/390_copy_binaries_libraries.sh pushd $ROOTFS_DIR local broken_symlink='' local link_target='' for broken_symlink in $broken_symlinks ; do # For each broken symlink absolute path inside ROOTFS_DIR # we call "readlink -e" in the original system to get its link target there. # If in the original system there was a chain of symbolic links like # /some/path/to/file1 -> /another/path/to/file2 -> /final/path/to/file3 # where $broken_symlink='/some/path/to/file1' and $link_target='/final/path/to/file3' # the chain of symbolic links gets simplified in the recovery system to $broken_symlink -> $link_target like # /some/path/to/file1 -> /final/path/to/file3 link_target=$( readlink $v -e $broken_symlink ) # The '-e' option results that every link_target has the form of an absolute path, # in particular also link targets of relative symlinks, # for example for the above broken symlink examples each link_target could be like: # /usr/share/zoneinfo/Europe/Berlin (e.g. the link target of /etc/localtime) # /proc/1234/mounts (e.g. the link target of /etc/mtab) # /usr/share/misc/termcap (e.g. the link target of /etc/termcap) # /path/to/file (e.g. the link target of /dir1/dir2/relative_symlink_to_file) # /path/to/directory (e.g. the link target of /dir3/relative_symlink_to_directory) if [[ -d "$link_target" ]]; then LogPrintError "Symlink '$broken_symlink' -> '$link_target' refers to a non-existing directory on the recovery system." LogPrintError "It will not be copied by default. You can include '$link_target' via the 'COPY_AS_IS' configuration variable." elif test "$link_target" ; then # Never copy symlink targets in /proc/ /sys/ /dev/ or /run/ into the ReaR recovery system # for example the symlink /etc/mtab that points to /proc/self/mounts # cf. https://github.com/rear/rear/issues/2111 # also cf. the scripts # finalize/GNU/Linux/250_migrate_disk_devices_layout.sh # finalize/GNU/Linux/250_migrate_lun_wwid.sh # finalize/GNU/Linux/280_migrate_uuid_tags.sh # finalize/GNU/Linux/320_migrate_network_configuration_files.sh if echo $link_target | grep -Eq '^/(proc|sys|dev|run)/' ; then DebugPrint "Skip copying broken symlink '$broken_symlink' target '$link_target' on /proc/ /sys/ /dev/ or /run/" continue fi # The leading '.' is crucial to create the parent directories inside the current working directory ROOTFS_DIR # and to copy the symlink target into the current working directory ROOTFS_DIR: mkdir $v -p .$( dirname $link_target ) || LogPrintError "Failed to make parent directories for symlink target '$link_target'" # Continue even after "Failed to make parent directories for symlink target ..." and let 'cp' also fail # to also show the explicit "Failed to copy symlink target ..." message to the user: cp $v --preserve=all $link_target .$link_target || LogPrintError "Failed to copy target of symlink '$broken_symlink' -> '$link_target'" else LogPrintError "Broken symlink '$broken_symlink' in recovery system because 'readlink' cannot determine its link target" fi done popd
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