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=/home/staticsync/etc/static-components
33 base=/home/staticsync/static-master/master
41 local path="$1"; shift
42 local exclusive="$1"; shift
44 eval "exec $fd< '$path'"
46 if [ "$exclusive" -gt 0 ]; then
52 if ! flock "$locktype" "$fd"; then
53 echo >&2 "$0: Cannot acquire lock on $base (flock $locktype failed) - Very bad, we should have waited!"
61 if ! flock -o "$fd"; then
62 echo >&2 "$0: Cannot release lock on fd $fd - This should not have happened!"
68 if [ "$#" != 1 ]; then
69 echo >&2 "Usage: $0 <component>"
75 if [ "${component%/*}" != "$component" ] ; then
76 echo >&2 "$0: Invalid component: $component";
80 src="$(awk -v component="$component" '$1 == component {print $2; exit}' "$componentlist")"
81 if [ -z "$src" ]; then
82 echo >&2 "$0: Invalid component: $component (not found in $componentlist)";
85 tgt="$base/$component"
86 if ! [ -d "$tgt" ]; then
87 echo >&2 "$0: Invalid component: $component ($tgt does not exist)";
91 echo "$0: Acquiring locks..."
95 tmpdir_new="$(mktemp -d --tmpdir="$base" "${component}.new-XXXXXX")"
96 tmpdir_old="$(mktemp -d --tmpdir="$base" "${component}.old-XXXXXX")"
97 trap "rm -rf '$tmpdir_new' '$tmpdir_old'" EXIT
98 chmod 0755 "$tmpdir_new"
100 lock 202 "$tmpdir_new" 1
103 echo "$0: Updating master copy of $component..."
107 "$src/." "$tmpdir_new/."
108 echo "$0: Done. Committing."
110 mv "$tgt" "$tmpdir_old/old"
111 if ! mv "$tmpdir_new" "$tgt"; then
112 echo >&2 "$0: WARNING: could not move $tmpdir_new to $tgt. Trying to recover"
114 mv "$tmpdir_old/old" "$tgt"
115 echo >&2 "$0: Rolled back to old tree maybe successfully."
119 rm -rf "$tmpdir_new" "$tmpdir_old"
122 date '+%s' > "$base/.serial"
125 echo "$0: Triggering mirror runs..."
126 exec static-master-run
130 # vim:set shiftwidth=2: