When bash module is added to omit_dracutmodules and dash module is enabled dracut installs both /bin/dash and /bin/bash, symlink /bin/sh is correct - it uses dash. When tmpdir is mounted with noexec this bug does not happen. Commenting line 740 'inst /bin/sh' in /usr/bin/dracut solved bug for me. Seems the bug was introduced in this upstream commit: commit bfd2e8c25ffc68bb98ca62049d709f378ac2ff1d Author: Harald Hoyer <harald@redhat.com> Date: Mon Jul 30 13:02:41 2012 +0200 dracut.sh: test if we can lazy resolve with ldd
Full list of unwanted and useless files installed to initramfs: +bin/bash +lib64/libdl-2.15.so +lib64/libdl.so.2 +lib64/libncurses.so.5 +lib64/libncurses.so.5.9 +lib64/libreadline.so.6 +lib64/libreadline.so.6.2 xz compressed image is 516K bigger. dracut installs bash even when system has '/bin/sh -> dash'.
Editing /usr/bin/dracut is not enough, also it is required to do 'ln -snf dash /bin/sh', else dracut will install libs for bash. Not sure why, but dracut installs /bin/sh instead of /bin/dash: # grep -e bin/sh -e bin/dash -e bin/bash /tmp/dracut_debug.log /usr/bin/dracut@740(): inst /bin/sh /usr/lib/dracut/dracut-functions.sh@718(inst): [[ -e /tmp/initramfs.gO2f9z//bin/sh ]] /usr/lib/dracut/dracut-functions.sh@720(inst): /usr/libexec/dracut-install -D /tmp/initramfs.gO2f9z /bin/sh dracut-install: Handle '/bin/sh' dracut-install: dracut_install('/bin/sh', '/bin/sh') dracut-install: dracut_install('/bin/dash', '/bin/dash') dracut-install: cp '/bin/dash' '/tmp/initramfs.gO2f9z/bin/dash' dracut-install: ln -s 'dash' '/tmp/initramfs.gO2f9z/bin/sh' /usr/bin/dracut@741(): /usr/libexec/dracut-install -D /tmp/initramfs.gO2f9z -R /tmp/initramfs.gO2f9z/bin/sh /usr/lib/dracut/modules.d/00dash/module-setup.sh@6(check): '[' -x /bin/dash ']' /usr/lib/dracut/modules.d/00dash/module-setup.sh@15(install): [[ -x /tmp/initramfs.gO2f9z/bin/sh ]] /usr/lib/dracut/modules.d/00dash/module-setup.sh@18(install): inst /bin/dash /usr/lib/dracut/dracut-functions.sh@718(inst): [[ -e /tmp/initramfs.gO2f9z//bin/dash ]] /usr/lib/dracut/dracut-functions.sh@720(inst): /usr/libexec/dracut-install -D /tmp/initramfs.gO2f9z -l /bin/dash dracut-install: Handle '/bin/dash' dracut-install: dracut_install('/bin/dash', '/bin/dash') dracut-install: cp '/bin/dash' '/tmp/initramfs.gO2f9z/bin/dash' /usr/lib/dracut/modules.d/00dash/module-setup.sh@18(install): ln -sf dash /tmp/initramfs.gO2f9z/bin/sh dracut-install: Script install: '/bin/sh' dracut-install: dracut_install('/bin/sh', '/bin/sh') dracut-install: '/tmp/initramfs.gO2f9z/bin/sh' already exists, but checking for any deps /usr/lib/dracut/modules.d/99base/module-setup.sh@23(install): '[' '!' -e /tmp/initramfs.gO2f9z/bin/sh ']' /usr/lib/dracut/modules.d/99base/module-setup.sh@29(install): echo root:x:0:0::/root:/bin/sh dracut-install: Script install: '/bin/sh' dracut-install: dracut_install('/bin/sh', '/bin/sh') dracut-install: '/tmp/initramfs.gO2f9z/bin/sh' already exists, but checking for any deps dracut-install: Script install: '/bin/sh' dracut-install: dracut_install('/bin/sh', '/bin/sh') dracut-install: '/tmp/initramfs.gO2f9z/bin/sh' already exists, but checking for any deps dracut-install: Script install: '/bin/sh' dracut-install: dracut_install('/bin/sh', '/bin/sh') dracut-install: '/tmp/initramfs.gO2f9z/bin/sh' already exists, but checking for any deps dracut-install: Script install: '/bin/sh' dracut-install: dracut_install('/bin/sh', '/bin/sh') dracut-install: '/tmp/initramfs.gO2f9z/bin/sh' already exists, but checking for any deps dracut-install: Script install: '/bin/sh' dracut-install: dracut_install('/bin/sh', '/bin/sh') dracut-install: '/tmp/initramfs.gO2f9z/bin/sh' already exists, but checking for any deps dracut-install: Script install: '/bin/sh' dracut-install: dracut_install('/bin/sh', '/bin/sh') dracut-install: '/tmp/initramfs.gO2f9z/bin/sh' already exists, but checking for any deps
Nikoli, are you sure about commit? Dracut removes all files inside ${initdir} after a test: inst /bin/sh if ! $DRACUT_INSTALL ${initdir:+-D "$initdir"} -R "$initdir/bin/sh" &>/dev/null; then unset DRACUT_RESOLVE_LAZY export DRACUT_RESOLVE_DEPS=1 fi rm -fr -- ${initdir}/* ---/^^^^^^^^^^^^^^^^^^^^^^ I supect that /bin/bash comes from inst_rule_programs(): $ grep -r 'PROGRAM==\"/bin/sh' . ./modules.d/90dmraid/61-dmraid-imsm.rules:PROGRAM=="/bin/sh -c 'for i in $sys/$devpath/holders/dm-[0-9]*; do [ -e $$i ] && exit 0; done; exit 1;' ", \ ./modules.d/90lvm/64-lvm.rules:PROGRAM=="/bin/sh -c 'for i in $sys/$devpath/holders/dm-[0-9]*; do [ -e $$i ] && exit 0; done; exit 1;' ", \
No. It's actually modules.d/99base/uefi-lib.sh :( From debug output: dracut-install: resolve_deps('/var/tmp/initramfs.wBmBoS/lib64/uefi-lib.sh') dracut-install: Script install: '/bin/bash' dracut-install: dracut_install('/bin/bash', '/bin/bash') $ head -n1 /usr/lib64/dracut/modules.d/99base/uefi-lib.sh #!/bin/bash $ checkbashisms /usr/lib64/dracut/modules.d/99base/uefi-lib.sh script /usr/lib64/dracut/modules.d/99base/uefi-lib.sh does not appear to be a /bin/sh script possible bashism in /usr/lib64/dracut/modules.d/99base/uefi-lib.sh line 28 (alternative test command ([[ foo ]] should be [ foo ])): [[ -n $c ]] && c=$(printf '%u' "'$c") || c=0 possible bashism in /usr/lib64/dracut/modules.d/99base/uefi-lib.sh line 37 ('((' should be '$(('): (( val = b2 * 256 + b1 )) possible bashism in /usr/lib64/dracut/modules.d/99base/uefi-lib.sh line 53 (alternative test command ([[ foo ]] should be [ foo ])): if [[ $first == 1 ]]; then possible bashism in /usr/lib64/dracut/modules.d/99base/uefi-lib.sh line 53 (should be 'b = a'): if [[ $first == 1 ]]; then possible bashism in /usr/lib64/dracut/modules.d/99base/uefi-lib.sh line 55 (alternative test command ([[ foo ]] should be [ foo ])): elif [[ $hextype != "7fff" ]]; then possible bashism in /usr/lib64/dracut/modules.d/99base/uefi-lib.sh line 70 (should be >word 2>&1): getword &>/dev/null possible bashism in /usr/lib64/dracut/modules.d/99base/uefi-lib.sh line 71 (should be >word 2>&1): getword &>/dev/null
(In reply to Nikoli from comment #0) > When tmpdir is mounted with noexec this bug does not happen. This is strange, because uefi-lib.sh is always installed.
(In reply to Nikoli from comment #0) > Seems the bug was introduced in this upstream commit: > commit bfd2e8c25ffc68bb98ca62049d709f378ac2ff1d > Author: Harald Hoyer <harald@redhat.com> > Date: Mon Jul 30 13:02:41 2012 +0200 > > dracut.sh: test if we can lazy resolve with ldd http://git.kernel.org/cgit/boot/dracut/dracut.git/commit/?id=46cc29261f9e6f5505d6d7ee84c10ea2a2de6469
Indeed uefi-lib.sh has several bashisms and '#!/bin/bash', hope, it will be made optional and bashisms will be fixed. Most systems did not use Fibre Channel over Ethernet (FCoE) now anyway.
Looks like it will be fixed in the next release: http://git.kernel.org/cgit/boot/dracut/dracut.git/commit/?id=89031be3735045ae06d560bf4f42ec58d889fe8e
This bug is almost fixed in 036. If I manually add "caps" to omitted modules, then bash is not included in initramfs.
sys-kernel/dracut-037-r3 does not have this bug anymore :)
(In reply to Nikoli from comment #10) > sys-kernel/dracut-037-r3 does not have this bug anymore :) Thank you for reporting that, Nikoli.:-)
systemd module pulls in bash in dracut-038 due to commit [1]. [1] http://git.kernel.org/cgit/boot/dracut/dracut.git/commit/?id=f232f6623d2b761c1538192c97e13842e5037adc
