#!/bin/sh
# Base filesystem package build script - creates merged-/usr directory structure

set -eu

: "${DESTDIR:?DESTDIR is not set}"

# Canonical merged-/usr directories
mkdir -p \
  "$DESTDIR/usr/bin" \
  "$DESTDIR/usr/lib" \
  "$DESTDIR/usr/lib32" \
  "$DESTDIR/usr/include" \
  "$DESTDIR/usr/share/man" \
  "$DESTDIR/usr/share/info" \
  "$DESTDIR/etc" \
  "$DESTDIR/var" \
  "$DESTDIR/tmp" \
  "$DESTDIR/home" \
  "$DESTDIR/root" \
  "$DESTDIR/run" \
  "$DESTDIR/dev" \
  "$DESTDIR/mnt" \
  "$DESTDIR/proc" \
  "$DESTDIR/sys" \
  "$DESTDIR/opt" \
  "$DESTDIR/srv" \
  "$DESTDIR/boot"

# Common optional dirs (safe to have even if empty)
mkdir -p \
  "$DESTDIR/usr/share" \
  "$DESTDIR/usr/libexec" \
  "$DESTDIR/usr/local" \
  "$DESTDIR/etc/profile.d" \
  "$DESTDIR/etc/skel" \
  "$DESTDIR/var/cache" \
  "$DESTDIR/var/lib/misc" \
  "$DESTDIR/var/log/old" \
  "$DESTDIR/var/empty" \
  "$DESTDIR/var/local" \
  "$DESTDIR/var/opt" \
  "$DESTDIR/var/tmp" \
  "$DESTDIR/var/spool/mail" \
  "$DESTDIR/usr/src" \
  "$DESTDIR/usr/share/misc" \
  "$DESTDIR/usr/share/pixmaps" \
  "$DESTDIR/usr/share/factory/etc"

chown 0:0 \
  "$DESTDIR/boot" \
  "$DESTDIR/dev" \
  "$DESTDIR/etc" \
  "$DESTDIR/etc/profile.d" \
  "$DESTDIR/etc/skel" \
  "$DESTDIR/home" \
  "$DESTDIR/mnt" \
  "$DESTDIR/opt" \
  "$DESTDIR/proc" \
  "$DESTDIR/root" \
  "$DESTDIR/run" \
  "$DESTDIR/srv" \
  "$DESTDIR/sys" \
  "$DESTDIR/tmp" \
  "$DESTDIR/usr" \
  "$DESTDIR/usr/bin" \
  "$DESTDIR/usr/include" \
  "$DESTDIR/usr/lib" \
  "$DESTDIR/usr/lib32" \
  "$DESTDIR/usr/libexec" \
  "$DESTDIR/usr/local" \
  "$DESTDIR/usr/share" \
  "$DESTDIR/usr/share/man" \
  "$DESTDIR/usr/share/info" \
  "$DESTDIR/usr/share/misc" \
  "$DESTDIR/usr/share/pixmaps" \
  "$DESTDIR/usr/share/factory/etc" \
  "$DESTDIR/usr/src" \
  "$DESTDIR/var" \
  "$DESTDIR/var/cache" \
  "$DESTDIR/var/empty" \
  "$DESTDIR/var/lib/misc" \
  "$DESTDIR/var/local" \
  "$DESTDIR/var/log/old" \
  "$DESTDIR/var/opt" \
  "$DESTDIR/var/spool/mail" \
  "$DESTDIR/var/tmp"

chmod 0755 \
  "$DESTDIR/boot" \
  "$DESTDIR/dev" \
  "$DESTDIR/etc" \
  "$DESTDIR/etc/profile.d" \
  "$DESTDIR/etc/skel" \
  "$DESTDIR/home" \
  "$DESTDIR/mnt" \
  "$DESTDIR/opt" \
  "$DESTDIR/run" \
  "$DESTDIR/srv" \
  "$DESTDIR/usr" \
  "$DESTDIR/usr/bin" \
  "$DESTDIR/usr/include" \
  "$DESTDIR/usr/lib" \
  "$DESTDIR/usr/libexec" \
  "$DESTDIR/usr/local" \
  "$DESTDIR/usr/share" \
  "$DESTDIR/usr/share/man" \
  "$DESTDIR/usr/share/info" \
  "$DESTDIR/usr/share/misc" \
  "$DESTDIR/usr/share/pixmaps" \
  "$DESTDIR/usr/share/factory/etc" \
  "$DESTDIR/usr/src" \
  "$DESTDIR/var" \
  "$DESTDIR/var/cache" \
  "$DESTDIR/var/empty" \
  "$DESTDIR/var/lib/misc" \
  "$DESTDIR/var/local" \
  "$DESTDIR/var/log/old" \
  "$DESTDIR/var/opt"

chmod 0555 "$DESTDIR/proc" "$DESTDIR/sys"
chmod 0750 "$DESTDIR/root"
chmod 1777 "$DESTDIR/tmp" "$DESTDIR/var/tmp" "$DESTDIR/var/spool/mail"

# Compatibility: make legacy top-level dirs point into /usr
# /bin  -> /usr/bin
# /sbin -> /usr/bin  (merged "one thing" behavior)
# /lib  -> /usr/lib
if [ ! -e "$DESTDIR/bin" ]; then
  ln -s usr/bin "$DESTDIR/bin"
fi

if [ ! -e "$DESTDIR/sbin" ]; then
  ln -s usr/bin "$DESTDIR/sbin"
fi

if [ ! -e "$DESTDIR/lib" ]; then
  ln -s usr/lib "$DESTDIR/lib"
fi

if [ ! -e "$DESTDIR/lib64" ]; then
  ln -s usr/lib "$DESTDIR/lib64"
fi

if [ ! -e "$DESTDIR/usr/sbin" ]; then
  ln -s bin "$DESTDIR/usr/sbin"
fi

# Default PATH for login shells
cat > "$DESTDIR/etc/profile.d/00-path.sh" <<'EOF'
# Default PATH for interactive shells
export PATH=/usr/bin:/usr/sbin:$PATH
EOF

# /etc/profile entrypoint to load profile.d snippets
cat > "$DESTDIR/etc/profile" <<'EOF'
# System-wide profile
for f in /etc/profile.d/*.sh; do
	[ -r "$f" ] && . "$f"
done
EOF

# Non-login interactive shells (bash reads this if enabled by the distro)
cat > "$DESTDIR/etc/bash.bashrc" <<'EOF'
# System-wide bashrc
for f in /etc/profile.d/*.sh; do
	[ -r "$f" ] && . "$f"
done
EOF

cat > "$DESTDIR/etc/os-release" <<'EOF'
NAME="Vertex Linux"
ID=vertex
PRETTY_NAME="Vertex Linux 1.0 (Parallel Panther)"
VERSION="1.0 (Parallel Panther)"
VERSION_ID="1.0"
VERSION_CODENAME=parallel_panther
BUILD_ID=1.0
HOME_URL="https://www.vertexlinux.net"
SUPPORT_URL="https://www.vertexlinux.net"
BUG_REPORT_URL="https://www.vertexlinux.net"
ANSI_COLOR="1;35"
EOF

cat > "$DESTDIR/etc/lsb-release" <<'EOF'
DISTRIB_ID=VertexLinux
DISTRIB_RELEASE=1.0
DISTRIB_CODENAME=parallel_panther
DISTRIB_DESCRIPTION="Vertex Linux 1.0 (Parallel Panther)"
DISTRIB_URL="https://vertexlinux.net"
EOF

cat > "$DESTDIR/etc/passwd" << 'EOF'
root:x:0:0:root:/root:/bin/zsh
bin:x:1:1:bin:/dev/null:/usr/bin/false
daemon:x:6:6:Daemon User:/dev/null:/usr/bin/false
messagebus:x:18:18:D-Bus Message Daemon User:/run/dbus:/usr/bin/false
uucp:x:14:14:UUCP User:/dev/null:/usr/bin/false
uuidd:x:80:80:UUID Generation Daemon User:/dev/null:/usr/bin/false
nobody:x:65534:65534:Unprivileged User:/dev/null:/usr/bin/false
EOF

cat > "$DESTDIR/etc/shadow" << 'EOF'
root:*:14871::::::
EOF

cat > "$DESTDIR/etc/shells" << 'EOF'
# Pathnames of valid login shells.
# See shells(5) for details.

/bin/sh
/bin/dash
/usr/bin/sh
/usr/bin/dash
EOF

cat > "$DESTDIR/etc/group" << 'EOF'
root:x:0:
bin:x:1:daemon
sys:x:2:
kmem:x:3:
tape:x:4:
tty:x:5:
daemon:x:6:
floppy:x:7:
disk:x:8:
lp:x:9:
dialout:x:10:
audio:x:11:
video:x:12:
utmp:x:13:
clock:x:14:
cdrom:x:15:
adm:x:16:
messagebus:x:18:
uucp:x:19:
input:x:24:
mail:x:34:
kvm:x:61:
uuidd:x:80:
wheel:x:97:
users:x:999:
nogroup:x:65534:
EOF

cat > "$DESTDIR/etc/hosts" << 'EOF'
# Static table lookup for hostnames.
# See hosts(5) for details.
127.0.0.1        localhost
::1              localhost
EOF

cat > "$DESTDIR/etc/issue" << 'EOF'
\S{PRETTY_NAME} \r (\l)
EOF

cat > "$DESTDIR/etc/fstab" << 'EOF'
# Static information about the filesystems.
# See fstab(5) for details.

# <file system> <dir> <type> <options> <dump> <pass>
EOF

cat > "$DESTDIR/etc/resolv.conf" << 'EOF'
# Resolver configuration file.
# See resolv.conf(5) for details.
EOF

ln -sv usr/lib32 "$DESTDIR/lib32"

echo "Merged-/usr filesystem directory structure created."