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mkosi: work-around to make systemd build in Fedora images that lack populated /etc

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On Fedora /usr/bin/ld is a symlink managed via the "alternatives"
system. This unfortunately means the binary is not usable in
environments where /var or /etc are unpopulated. Let's address this by
redirecting "ld" to "ld.bfd" manually if such an environment is
detected, via $PATH.

This is useful for building systemd in mkosi with UsrOnly=1 set.
This commit is contained in:
Lennart Poettering 2021-04-01 17:58:54 +02:00
parent d997861ea7
commit 7211773a55
1 changed files with 12 additions and 0 deletions
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mkosi.build
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@ -14,6 +14,18 @@ if ! mountpoint -q "$SRCDIR"; then
umask 022
fi
# On Fedora "ld" is (unfortunately — if you ask me) managed via
# "alternatives". Since we'd like to support building images in environments
# with only /usr/ around (e.g. mkosi's UsrOnly=1 option), we have the problem
# that /usr/bin/ld is a symlink that points to a non-existing file in
# /etc/alternative/ in this mode. Let's work around this for now by manually
# redirect "ld" to "ld.bfd", i.e. circumventing the /usr/bin/ld symlink.
if [ ! -x /usr/bin/ld -a -x /usr/bin/ld.bfd ] ; then
mkdir -p "$HOME"/bin
ln -s /usr/bin/ld.bfd "$HOME"/bin/ld
PATH="$HOME/bin:$PATH"
fi
# If mkosi.builddir/ exists mkosi will set $BUILDDIR to it, let's then use it
# as out-of-tree build dir. Otherwise, let's make up our own builddir.
[ -z "$BUILDDIR" ] && BUILDDIR=build