diff options
| author | nikp123 | 2018-04-07 15:06:55 +0200 |
|---|---|---|
| committer | nikp123 | 2018-04-07 15:06:55 +0200 |
| commit | 99573fca2ae6380a50bec32e5fe0491dbc8556b1 (patch) | |
| tree | 73c66ccaebc9a81d66023165e4685b002c9c4259 | |
| download | aur-mkinitcpio-dir.tar.gz | |
Initial commit
| -rw-r--r-- | .SRCINFO | 17 | ||||
| -rw-r--r-- | PKGBUILD | 24 | ||||
| -rw-r--r-- | README.md | 49 | ||||
| -rw-r--r-- | hook | 9 | ||||
| -rw-r--r-- | install | 12 |
5 files changed, 111 insertions, 0 deletions
diff --git a/.SRCINFO b/.SRCINFO new file mode 100644 index 000000000000..08f5c52360bd --- /dev/null +++ b/.SRCINFO @@ -0,0 +1,17 @@ +pkgbase = mkinitcpio-dir + pkgdesc = Initcpio hook to mount a subdirectory as the root file system + pkgver = 0.2.0 + pkgrel = 0 + url = https://bbs.archlinux.org/viewtopic.php?pid=932362#p932362 + arch = any + license = custom:Public domain + depends = mkinitcpio + source = README.md + source = hook + source = install + md5sums = SKIP + md5sums = SKIP + md5sums = SKIP + +pkgname = mkinitcpio-dir + diff --git a/PKGBUILD b/PKGBUILD new file mode 100644 index 000000000000..daa996254d65 --- /dev/null +++ b/PKGBUILD @@ -0,0 +1,24 @@ +# Maintainer: Martin Panter <vadmium à gmail·com> +_name=dir +pkgname="mkinitcpio-$_name" +pkgver=0.2.0 +pkgrel=0 +pkgdesc="Initcpio hook to mount a subdirectory as the root file system" +url="https://bbs.archlinux.org/viewtopic.php?pid=932362#p932362" +arch=(any) +license=("custom:Public domain") +depends=(mkinitcpio) +source=(README.md hook install) +md5sums=(SKIP SKIP SKIP) + +package() { + local DEST=( + "usr/share/doc/$pkgname/README.md" + "usr/lib/initcpio/hooks/$_name" + "usr/lib/initcpio/install/$_name" + ) + for((i = 0; i < "${#source[@]}"; ++i)); do + mkdir -p "$pkgdir/$(dirname "${DEST[i]}")" + install -Dm644 "$srcdir/${source[i]}" "$pkgdir/${DEST[i]}" + done +} diff --git a/README.md b/README.md new file mode 100644 index 000000000000..8821451fd043 --- /dev/null +++ b/README.md @@ -0,0 +1,49 @@ +# Filesystem-in-subdirectory hook for “mkinitcpio” # + +This “mkinitcpio” hook mounts the root file system from a subdirectory rather +than the root directory of a partition. The “dir=” kernel parameter specifies +which subdirectory. A leading slash (/) is allowed but not necessary. + +This allows multiple separate operating systems to be installed in a single +partition. +For example a single partition could contain +multiple OS filesystems and other shared files: + +* /os/arch-x86-64/bin/ +* /os/arch-x86-64/etc/ +* . . . +* /os/arch-i686/bin/ +* /os/arch-i686/etc/ +* . . . +* /home/_user_/ +* /os/debian/ (potentially) +* /os/win/WINDOWS/ (if a common filesystem was supported) + +It is achieved by using a “bind mount” of the subdirectory. + +## Installation ## + +Add “dir” to the HOOKS list in /etc/mkinitcpio.conf: + + HOOKS+=" dir" + +Add a “dir=” parameter to the kernel command line +(for example in /boot/grub/menu.lst). +The path is relative to the file system of the “root” device. For example: + +> APPEND root=LABEL=_label_ dir=/os/arch-x86-64 ro + +## Issues ## + +It’s also useful to mount the whole partition somewhere as well +using /etc/fstab, although this means that +all the files under the mounted OS directory +will be visible under both mount points. +Although I have not seen any serious problems, +some programs complain about a circular file system loop: + +> find: File system loop detected + +> du: WARNING: Circular directory structure. +> This almost certainly means that you have a corrupted file system. +> NOTIFY YOUR SYSTEM MANAGER. @@ -0,0 +1,9 @@ +run_hook() { + dir_pre_mount_handler="${mount_handler:-default_mount_handler}" + mount_handler=dir_mount_handler +} + +dir_mount_handler() { + $dir_pre_mount_handler "$1" + mount --bind -- "$1/$dir" "$1" +} diff --git a/install b/install new file mode 100644 index 000000000000..6136ea524c21 --- /dev/null +++ b/install @@ -0,0 +1,12 @@ +build() { + add_runscript +} + +help() { +cat<<HELP + Mounts a subdirectory as the actual root file system. The "dir=" kernel + parameter specifies which subdirectory. A leading slash (/) is allowed but + not necessary. This hook should come after any hook that mounts the parent + file system. +HELP +} |