3 # Updates one component (i.e. subdirectory) in static-master/master
5 # acquires a shared lock on the base directory (so that we know no updates are
6 # outgoing, as those acquire an exclusive one). Also acquired an exclusive lock
7 # on the component directory in question.
9 # The config file is a list of component source-directory pairs.
11 # Copyright (c) 2012 Peter Palfrader
13 # Permission is hereby granted, free of charge, to any person obtaining
14 # a copy of this software and associated documentation files (the
15 # "Software"), to deal in the Software without restriction, including
16 # without limitation the rights to use, copy, modify, merge, publish,
17 # distribute, sublicense, and/or sell copies of the Software, and to
18 # permit persons to whom the Software is furnished to do so, subject to
19 # the following conditions:
21 # The above copyright notice and this permission notice shall be
22 # included in all copies or substantial portions of the Software.
24 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
32 componentlist=/etc/static-components.conf
33 base=/home/staticsync/static-master/master
38 if [ "`id -u`" != "`stat -c %u "$base"`" ]; then
39 echo >&2 "You are probably running this as the wrong user."
45 local path="$1"; shift
46 local exclusive="$1"; shift
48 eval "exec $fd< '$path'"
50 if [ "$exclusive" -gt 0 ]; then
56 if ! flock "$locktype" "$fd"; then
57 echo >&2 "$0: Cannot acquire lock on $base (flock $locktype failed) - Very bad, we should have waited!"
65 if ! flock -o "$fd"; then
66 echo >&2 "$0: Cannot release lock on fd $fd - This should not have happened!"
72 if [ "$#" != 1 ]; then
73 echo >&2 "Usage: $0 <component>"
79 if [ "${component%/*}" != "$component" ] ; then
80 echo >&2 "$0: Invalid component: $component";
84 srchost="$(awk -v component="$component" '$1 == component {print $2; exit}' "$componentlist")"
85 srcdir="$(awk -v component="$component" '$1 == component {print $3; exit}' "$componentlist")"
86 if [ -z "$srchost" ] || [ -z "$srcdir" ]; then
87 echo >&2 "$0: Invalid component: $component (not found in $componentlist)";
90 tgt="$base/$component"
91 if ! [ -d "$tgt" ]; then
92 echo "$0: Creating $tgt for $component";
96 if [ "$srchost" = "`hostname -f`" ]; then
99 src="$srchost:$srcdir"
102 echo "$0: Acquiring locks..."
106 tmpdir_new="$(mktemp -d --tmpdir="$base" "${component}.new-XXXXXX")"
107 tmpdir_old="$(mktemp -d --tmpdir="$base" "${component}.old-XXXXXX")"
108 trap "rm -rf '$tmpdir_new' '$tmpdir_old'" EXIT
109 chmod 0755 "$tmpdir_new"
111 lock 202 "$tmpdir_new" 1
114 echo "$0: Updating master copy of $component..."
117 --links --hard-links --safe-links \
119 "$src/." "$tmpdir_new/."
120 echo "$0: Done. Committing."
122 mv "$tgt" "$tmpdir_old/old"
123 if ! mv "$tmpdir_new" "$tgt"; then
124 echo >&2 "$0: WARNING: could not move $tmpdir_new to $tgt. Trying to recover"
126 mv "$tmpdir_old/old" "$tgt"
127 echo >&2 "$0: Rolled back to old tree maybe successfully."
131 rm -rf "$tmpdir_new" "$tmpdir_old"
134 date '+%s' > "$base/.serial"
137 echo "$0: Triggering mirror runs..."
138 exec static-master-run
142 # vim:set shiftwidth=2: