add project id option (#75)

Added a project id option -j so that the script can be run to backup multiple projects without needing to change the gcloud config core.project each time. Here's an example of how we'll be using the feature.

Author: rmceoin

README.md

@@ -72,6 +72,8 @@ Options:
           Default if not set: 'gcs' [OPTIONAL]
     -a    Service Account to use. 
           Blank if not set [OPTIONAL]
+    -j    Project ID to use.
+          Blank if not set [OPTIONAL]
     -n    Dry run: causes script to print debug variables and doesn't execute any 
           create / delete commands [OPTIONAL]
 ```
@@ -154,6 +156,20 @@ For example:
 
     ./gcloud-snapshot.sh -a "[email protected]"
 
+### Project ID
+By default snapshots are created with the default gcloud project id. To use a custom project id use the -j flag:
+
+    Usage: ./gcloud-snapshot.sh [-j <project_id>]
+    
+    Options:
+    
+       -j  Project ID to use.
+           Blank if not set [OPTIONAL]
+
+For example:
+
+    ./gcloud-snapshot.sh -j "my-test-project"
+
 ### Dry Run
 The script can be run in dry run mode, which doesn't execute any create / delete commands, and prints out debug information.
 
@@ -229,4 +245,4 @@ Permission is hereby granted, free of charge, to any person obtaining a copy of
 
 The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

gcloud-snapshot.sh

@@ -20,7 +20,7 @@ export PATH=$PATH:/usr/local/bin/:/usr/bin
 #
 
 usage() {
-    echo -e "\nUsage: $0 [-d <days>] [-r <remote_instances>] [-f <gcloud_filter_expression>] [-p <prefix>] [-a <service_account>] [-n <dry_run>]" 1>&2
+    echo -e "\nUsage: $0 [-d <days>] [-r <remote_instances>] [-f <gcloud_filter_expression>] [-p <prefix>] [-a <service_account>] [-n <dry_run>] [-j <project_id>]" 1>&2
     echo -e "\nOptions:\n"
     echo -e "    -d    Number of days to keep snapshots.  Snapshots older than this number deleted."
     echo -e "          Default if not set: 7 [OPTIONAL]"
@@ -32,6 +32,8 @@ usage() {
     echo -e "          Default if not set: 'gcs' [OPTIONAL]"
     echo -e "    -a    Service Account to use."
     echo -e "          Blank if not set [OPTIONAL]"
+    echo -e "    -j    Project ID to use."
+    echo -e "          Blank if not set [OPTIONAL]"
     echo -e "    -n    Dry run: causes script to print debug variables and doesn't execute any"
     echo -e "          create / delete commands [OPTIONAL]"
     echo -e "\n"
@@ -45,7 +47,7 @@ usage() {
 
 setScriptOptions()
 {
-    while getopts ":d:rf:p:a:n" opt; do
+    while getopts ":d:rf:p:a:j:n" opt; do
         case $opt in
             d)
                 opt_d=${OPTARG}
@@ -62,6 +64,9 @@ setScriptOptions()
             a)
                 opt_a=${OPTARG}
                 ;;
+            j)
+                opt_j=${OPTARG}
+                ;;
             n)
                 opt_n=true
                 ;;
@@ -110,6 +115,13 @@ setScriptOptions()
         OPT_ACCOUNT=""
     fi
 
+    # gcloud Project
+    if [[ -n $opt_j ]]; then
+        OPT_PROJECT="--project $opt_j"
+    else
+        OPT_PROJECT=""
+    fi
+
     # Dry run
     if [[ -n $opt_n ]]; then
         DRY_RUN=$opt_n
@@ -122,6 +134,7 @@ setScriptOptions()
         printDebug "FILTER_CLAUSE=${FILTER_CLAUSE}"
         printDebug "PREFIX=${PREFIX}"
         printDebug "OPT_ACCOUNT=${OPT_ACCOUNT}"
+        printDebug "OPT_PROJECT=${OPT_PROJECT}"
         printDebug "DRY_RUN=${DRY_RUN}"
     fi
 }
@@ -154,7 +167,7 @@ getInstanceName()
 
 getDeviceList()
 {
-    echo -e "$(gcloud $OPT_ACCOUNT compute disks list $1 --filter "$FILTER_CLAUSE" --format='value(name,zone,id)')"
+    echo -e "$(gcloud $OPT_ACCOUNT compute disks list $1 --filter "$FILTER_CLAUSE" --format='value(name,zone,id)' $OPT_PROJECT)"
 }
 
 
@@ -202,9 +215,9 @@ createSnapshotName()
 createSnapshot()
 {
     if [ "$DRY_RUN" = true ]; then
-        printCmd "gcloud ${OPT_ACCOUNT} compute disks snapshot $1 --snapshot-names $2 --zone $3"
+        printCmd "gcloud ${OPT_ACCOUNT} compute disks snapshot $1 --snapshot-names $2 --zone $3 ${OPT_PROJECT}"
     else
-        $(gcloud $OPT_ACCOUNT compute disks snapshot $1 --snapshot-names $2 --zone $3)
+        $(gcloud $OPT_ACCOUNT compute disks snapshot $1 --snapshot-names $2 --zone $3 ${OPT_PROJECT})
     fi
 }
 
@@ -233,7 +246,7 @@ deleteSnapshots()
     local snapshots=()
 
     # get list of snapshots from gcloud for this device
-    local gcloud_response="$(gcloud $OPT_ACCOUNT compute snapshots list --filter="name~'"$1"' AND creationTimestamp<'$2' AND sourceDiskId='$3'" --uri)"
+    local gcloud_response="$(gcloud $OPT_ACCOUNT compute snapshots list --filter="name~'"$1"' AND creationTimestamp<'$2' AND sourceDiskId='$3'" --uri ${OPT_PROJECT})"
 
     # loop through and get snapshot name from URI
     while read line
@@ -263,9 +276,9 @@ deleteSnapshots()
 deleteSnapshot()
 {
     if [ "$DRY_RUN" = true ]; then
-        printCmd "gcloud ${OPT_ACCOUNT} compute snapshots delete $1 -q"
+        printCmd "gcloud ${OPT_ACCOUNT} compute snapshots delete $1 -q ${OPT_PROJECT}"
     else
-        $(gcloud $OPT_ACCOUNT compute snapshots delete $1 -q)
+        $(gcloud $OPT_ACCOUNT compute snapshots delete $1 -q ${OPT_PROJECT})
     fi
 }
 
@@ -361,4 +374,4 @@ main()
 ##                ##
 ####################
 
-main "$@"
+main "$@"