[Buildroot] [git commit] package/dracut: workaround breakage on non-merged-usr hosts
Thomas Petazzoni
thomas.petazzoni at bootlin.com
Sun Nov 13 21:10:55 UTC 2022
commit: https://git.buildroot.net/buildroot/commit/?id=a4f5ed5a7cf035d448c49edd8d106a09ce945170
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master
dracut is not really ready to be installed with a non-/ prefix, and it
has a lot of hard-coded assumptions that it is going to run on the host
for which it is goign to generate an initramfs; for example, it
hard-codes calls to /lib/dracut/some-file in some of its modules. It
also uses the host system layout to decide whether it needs a
merged-usr or not.
Furthermore, dracut populates the temporary directory which content will
be used to generate the cpio, with a bunch of files, even before calling
any of the dracut modules.
The name for that temporary directory is not predictable (looks like the
output of 'mktemp -d dracut.XXXXXX', with names like dracut.1Vfn9F seen
while debugging).
As a consequence, we can't prepare the temporary directory with the
proper symlinks beforehand.
So, we provide a very-early module of our own, that will (hopefully) run
before any other module, to fixup the messed-up layout prepared by
dracut. This module moves the content of /lib, /bin, and /sbin, out and
into their counterparts in /usr, and creates the usual symlinks.
When we do not require a merged-usr, then we have nothing to do, so the
module checks for /lib being a symlink, as the hint that we want a
merged-usr or not.
Note: currently, we've seen nothing that dracut installed in /bin or
/sbin, but for trying to be future-proof, we also handle them; this
causes a spurious warning:
mv: cannot stat '..../build/buildroot-fs/cpio/tmp/dracut.YQnzNP/initramfs/bin/*': No such file or directory
Since there are already quite a bunch of similar failures in the
official modules bundled in dracut, an extra such issue or two should
not be too scary...
Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/3282261241
https://gitlab.com/buildroot.org/buildroot/-/jobs/3282261239
https://gitlab.com/buildroot.org/buildroot/-/jobs/3282261236
Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
Cc: Thierry Bultel <thierry.bultel at linatsea.fr>
Cc: Adam Duskett <aduskett at gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
---
package/dracut/dracut.mk | 2 ++
package/dracut/merged-usr-module-setup.sh | 26 ++++++++++++++++++++++++++
2 files changed, 28 insertions(+)
diff --git a/package/dracut/dracut.mk b/package/dracut/dracut.mk
index 742a073a36..597492bc5e 100644
--- a/package/dracut/dracut.mk
+++ b/package/dracut/dracut.mk
@@ -22,6 +22,8 @@ HOST_DRACUT_POST_INSTALL_HOOKS += HOST_DRACUT_POST_INSTALL_WRAPPER_SCRIPT
# "ld-musl-x.so" symlinks, respectively - else the init process cannot
# start
define HOST_DRACUT_POST_INSTALL_LIBC_LINKS_MODULE
+ $(INSTALL) -D -m 0755 package/dracut/merged-usr-module-setup.sh \
+ $(HOST_DIR)/lib/dracut/modules.d/0000-merged-usr/module-setup.sh
$(INSTALL) -D -m 0755 package/dracut/libc-links-module-setup.sh \
$(HOST_DIR)/lib/dracut/modules.d/05libc-links/module-setup.sh
endef
diff --git a/package/dracut/merged-usr-module-setup.sh b/package/dracut/merged-usr-module-setup.sh
new file mode 100644
index 0000000000..6dc0e7ca7b
--- /dev/null
+++ b/package/dracut/merged-usr-module-setup.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+check() {
+ [ -L "${dracutsysrootdir?}/lib" ]
+}
+
+depends() {
+ return 0
+}
+
+install() {
+ # dracut pre-installs a set of files before calling any of
+ # the modules, and dracut also messes up host vs. target
+ # system, so on a non-merged-usr host, it will prepare a
+ # non-merged-usr initramfs, even though the current config
+ # is for a merged-usr system.
+ # So undo its borkage.
+ for dir in lib bin sbin; do
+ mkdir -p "${initdir?}/usr/${dir}"
+ if [ -d "${initdir?}/${dir}" ]; then
+ mv "${initdir?}/${dir}/"* "${initdir?}/usr/${dir}"
+ rm -rf "${initdir?}/${dir}"
+ ln -s "usr/${dir}" "${initdir?}/${dir}"
+ fi
+ done
+}
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