login: warning missing pam_lastlog.so

[troglobit]

login[2819]: PAM unable to dlopen(/lib/security/pam_lastlog.so): /lib/security/pam_lastlog.so: cannot open shared object file: No such file or directory

[mattiaswal]

lastlog is not enabled in linux-pam in buildroot.
I think lastlog is a good thing, but --enable-lastlog needs to be added to buildroot recipe.

[troglobit]

Aha, time for some upstream work then! I'll have a look :-)

[mattiaswal]

Aha, time for some upstream work then! I'll have a look :-)

Please also upstream my patch on linux pam to fix path for .pc files when you are already on 🔥

[troglobit]

Ouch, that one looks a bit nasty ... I think we should revert our change and fix rousette instead, because the Buildroot pkg-config seems to work just fine: locating the .pc files in /lib (staging).

~/src/buildroot(linux-pam-options)$ ./output/host/bin/pkg-config --cflags pam
-I./output/host/bin/../x86_64-buildroot-linux-uclibc/sysroot/usr/include/security 
~/src/buildroot(linux-pam-options)$ ./output/host/bin/pkg-config --libs pam
-L./output/host/bin/../x86_64-buildroot-linux-uclibc/sysroot/lib -lpam 

[troglobit]

Upstream patch for pam_lastlog.so https://lore.kernel.org/buildroot/20240804095012.878259-1-troglobit@gmail.com/T/#u

[mattiaswal]

./output/host/bin/pkg-config --cflags pam

lazzer@tollan ~/Documents/addiva/infix (main)$ ./output/host/bin/pkg-config --cflags pam
Package pam was not found in the pkg-config search path.
Perhaps you should add the directory containing `pam.pc'
to the PKG_CONFIG_PATH environment variable
Package 'pam', required by 'virtual:world', not found
lazzer@tollan ~/Documents/addiva/infix (main)$ 

[mattiaswal]

How do find output/ -name.pc looks like?

My (relevant parts) looks like:

output/host/x86_64-buildroot-linux-gnu/sysroot/lib/pkgconfig/pamc.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/lib/pkgconfig/pam.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/lib/pkgconfig/pam_misc.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/dbus-cxx-2.0.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/libtirpc.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/libnetfilter_cthelper.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/libnetfilter_conntrack.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/libuev.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/ext2fs.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/avahi-core.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/libbsd.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/libpcre2-8.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/libsyslog.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/glib-2.0.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/popt.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/libassuan.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/sysrepo.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/libpcre2-posix.pc
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/pkgconfig/json-c.pc
.....

[troglobit]

Interesting, here's my output, notably from Buildroot (recently branched from) master:

~/src/buildroot(linux-pam-options)$ find output/staging/ -name '*.pc'
output/staging/usr/lib/pkgconfig/libcrypt.pc
output/staging/usr/lib/pkgconfig/libxcrypt.pc
output/staging/usr/lib/pkgconfig/python-3.12-embed.pc
output/staging/usr/lib/pkgconfig/fmt.pc
output/staging/usr/lib/pkgconfig/python3.pc
output/staging/usr/lib/pkgconfig/libsyslog.pc
output/staging/usr/lib/pkgconfig/zlib.pc
output/staging/usr/lib/pkgconfig/pam.pc
output/staging/usr/lib/pkgconfig/pam_misc.pc
output/staging/usr/lib/pkgconfig/python3-embed.pc
output/staging/usr/lib/pkgconfig/spdlog.pc
output/staging/usr/lib/pkgconfig/python-3.12.pc
output/staging/usr/lib/pkgconfig/pamc.pc
output/staging/usr/lib/pkgconfig/expat.pc
output/staging/usr/lib/pkgconfig/openssl.pc
output/staging/usr/lib/pkgconfig/libssl.pc
output/staging/usr/lib/pkgconfig/libffi.pc
output/staging/usr/lib/pkgconfig/libcrypto.pc

Lemme have a look around the tree.

[troglobit]

Found it, root cause is:

# BR2_ROOTFS_MERGED_USR is not set

With it unset, as in Infix' defconfigs, I get the same as you:

~/src/buildroot(linux-pam-options)$ find output/staging/ -name '*.pc'
output/staging/usr/lib/pkgconfig/libcrypt.pc
output/staging/usr/lib/pkgconfig/libxcrypt.pc
output/staging/usr/lib/pkgconfig/python-3.12-embed.pc
output/staging/usr/lib/pkgconfig/python3.pc
output/staging/usr/lib/pkgconfig/libsyslog.pc
output/staging/usr/lib/pkgconfig/zlib.pc
output/staging/usr/lib/pkgconfig/python3-embed.pc
output/staging/usr/lib/pkgconfig/python-3.12.pc
output/staging/usr/lib/pkgconfig/expat.pc
output/staging/usr/lib/pkgconfig/openssl.pc
output/staging/usr/lib/pkgconfig/libssl.pc
output/staging/usr/lib/pkgconfig/libffi.pc
output/staging/usr/lib/pkgconfig/libcrypto.pc
output/staging/lib/pkgconfig/pam.pc
output/staging/lib/pkgconfig/pam_misc.pc
output/staging/lib/pkgconfig/pamc.pc

Since there's no point really in maintaining a difference beteen /bin,/sbin and /usr/bin,/usr/sbin et al on Infix, I suggest we update our defconfigs to:

BR2_ROOTFS_MERGED_USR=y

Which is the default, so dropping the line entirely would be equivalent.