#!/bin/bash -e

## Copyright (c) 2005 David B. Harris <dbharris@eelf.ddts.net>
## This text is released under the "three-clause BSD license".
## The full text of the license is available at the end of this file.

printf "\nrecvconf on %s processing:\n" "$(hostname -s)"
FILELIST=/etc/oftc/recvconf.files

temptar="$(mktemp)"
chmod 0600 "$temptar"

tempscript="$(mktemp)"
chmod 0600 "$tempscript"

tempdir="$(mktemp -d)"

# Read tarball from STDIN
gzip -dc > "$temptar"

cd "$tempdir"
tar xf "$temptar"

copy_and_runcommands() {

    local file perms user group precommand postcommand
    file="$1"; perms="$2"; user="$3"; group="$4"; precommand="$5"; postcommand="$6"

    if [ -f "$file" ]; then
	if [ -h "$file" ]; then # File should NOT be a symlink
	    printf "\`%s' is a symlink, aborting.\n" "$file" >&2
	    return 1
	fi

	if ! [ "$file" -nt "/$file" ]; then
	    rm -f "$file"
	    return 0
	fi

	if [ -n "$precommand" ]; then
	    printf "Running precommand \`%s' for %s\n" "$precommand" "$file" >&2
	    eval -- $precommand >&2
	fi

	if [ -n "$perms" ]; then
	    chmod -- "$perms" "$file"
	else
	    printf "Warning, no perms defined for \`%s', assuming 0640.\n" "$file" >&2
	    chmod 0640 "$file"
	fi
	if [ -n "$user" ]; then
	    chown -- "$user" "$file"
	else
	    printf "Warning, no user defined for \`%s', assuming root.\n" "$file" >&2
	    chown root "$file"
	fi
	if [ -n "$group" ]; then
	    chgrp -- "$group" "$file"
	else
	    printf "Warning, no group defined for \`%s', assuming root.\n" "$file" >&2
	    chgrp root "$file"
	fi

	if [ ! -d "/$(dirname "$file")" ]; then
	    printf "Directory \`%s' does not exist, aborting.\n" "$(dirname "$file")" >&2
	    exit 1
	fi

	cp -a -- "$file" "/$(dirname "$file")" >&2
	ls -l "/$(dirname "$file")/$(basename "$file")" >&2

	if [ -n "$postcommand" ]; then
	    if ! grep -F -- "$postcommand" "$tempscript" > /dev/null 2>&1; then
		printf "%s\n" "$postcommand" >> "$tempscript"
	    fi
	fi

	rm -f -- "$file"
    fi
}

IN=0
linenum=0
nextfile=""
while read line; do
    linenum="$(($linenum + 1))"

    if printf "%s\n" "$line" | grep -E '^[[:space:]]*$' > /dev/null 2>&1; then
	## This line is an empty line; skip it
	continue
    elif printf "%s" "$line" | grep -E '^[[:space:]]*#' > /dev/null 2>&1; then
	## This line is a comment; skip it
	continue
    fi

    ## IN=0, so we're out of a stanza: better get a file declaration next
    if [ "$IN" = "0" ] && ! printf "%s" "$line" | grep -E '^[[:space:]]*file[[:space:]]' > /dev/null 2>&1; then
	printf "Error on line %s, file declaration expected. Got\n\t%s\n" "$linenum" "$line" >&2
	exit 1
    elif [ "$IN" = 0 ] && printf "%s" "$line" | grep -E '^[[:space:]]*file[[:space:]]' > /dev/null 2>&1; then
	## Okay, we're just starting out; set $file and move on
	file="$(printf "%s" "$line" | sed -e 's/[[:space:]]*file[[:space:]]\+\([^[:space:]#]*\).*/\1/')"
	IN=1
	continue
    elif [ "$IN" = 1 ] && printf "%s" "$line" | grep -E '^[[:space:]]*file[[:space:]]' > /dev/null 2>&1; then
	## Okay, not only are we at a file declaration, but this isn't our first one. Run the commands to process
	## the file, then set a $file to the new value and continue parsing.
	[ -n "$file" ] && copy_and_runcommands "$file" "$perms" "$user" "$group" "$precommand" "$postcommand"
	file="$(printf "%s" "$line" | sed -e 's/[[:space:]]*file[[:space:]]\+\([^[:space:]#]*\).*/\1/')"
	perms=""; user=""; group=""; precommand=""; postcommand=""
	continue
    fi

    ## The last two if blocks weren't processed; thus this isn't a comment, a blank line, and we're in the middle of a stanza
    if printf "%s" "$line" | grep -E '^[[:space:]]*perms[[:space:]]' > /dev/null 2>&1; then
	perms="$(printf "%s" "$line" | sed -e 's/[[:space:]]*perms[[:space:]]\+\([^[:space:]#]*\).*/\1/')"
	continue
    elif printf "%s" "$line" | grep -E '^[[:space:]]*user[[:space:]]' > /dev/null 2>&1; then
	user="$(printf "%s" "$line" | sed -e 's/[[:space:]]*user[[:space:]]\+\([^[:space:]#]*\).*/\1/')"
	continue
    elif printf "%s" "$line" | grep -E '^[[:space:]]*group[[:space:]]' > /dev/null 2>&1; then
	group="$(printf "%s" "$line" | sed -e 's/[[:space:]]*group[[:space:]]\+\([^[:space:]#]*\).*/\1/')"
	continue
    elif printf "%s" "$line" | grep -E '^[[:space:]]*precommand[[:space:]]' > /dev/null 2>&1; then
	precommand="$(printf "%s" "$line" | sed -e 's/[[:space:]]*precommand[[:space:]]\+\([^[:space:]#]*\)/\1/')"
	continue
    elif printf "%s" "$line" | grep -E '^[[:space:]]*postcommand[[:space:]]' > /dev/null 2>&1; then
	postcommand="$(printf "%s" "$line" | sed -e 's/[[:space:]]*postcommand[[:space:]]\+\([^[:space:]#]*\)/\1/')"
	continue
    else
	printf "Unknown token at line %s:\n\t%s\n" "$linenum" "$line"
    fi

done < "$FILELIST"

## This is the last stanza and the above loop has set the variables, but hasn't yet processed the file
[ -n "$file" ] && copy_and_runcommands "$file" "$perms" "$user" "$group" "$precommand" "$postcommand"

if [ -s "$tempscript" ]; then
    tempoutput="$(mktemp)"
    ## Post-copying commands to be run, run them here. Only display output if they exit with $? > 0
    while read command; do
	printf "Running postcommand \`%s' on %s.\n" "$command" "$(hostname -s)" >&2
	if ! eval -- "$command" > "$tempoutput" 2>&1; then
	    printf "Error, postcommand \`%s' on %s failed. Output follows:\n" "$command" "$(hostname -s)" >&2
	    cat -- "$tempoutput" >&2
	    exit 1
	fi
    done < "$tempscript"
fi

# Check for any leftover files here; if there are any, exit with an error and print the list
if [ ! -z "$(find . -type f)" ]; then
    printf "The following files were not listed in /etc/oftc/recvconf.files:\n%s\n" "$(find . -type f)" >&2
    exit 1
fi

rm -f -- "$temptar"
rm -f -- "$tempoutput"
rm -f -- "$tempscript"
cd
rm -rf -- "$tempdir"

printf "recvconf on %s finished.\n" "$(hostname -s)"

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## 
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