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functions.sh
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functions.sh
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#!/bin/bash
## Function Definitions
## Function: trap_push 'COMMAND_STRING'
## Appends a command to a trap, which is needed because default trap behavior is to replace
## previous trap for the same signal
## - 1st arg: code to add
## - ref: http://stackoverflow.com/questions/3338030/multiple-bash-traps-for-the-same-signal
_trap_push() {
local next="$1"
eval "trap_push() {
local oldcmd='$(echo "$next" | sed -e s/\'/\'\\\\\'\'/g)'
local newcmd=\"\$1; \$oldcmd\"
trap -- \"\$newcmd\" EXIT INT TERM HUP
_trap_push \"\$newcmd\"
}"
}
_trap_push true
## Function: warn MESSAGE
## Print message to stderr
warn() {
local message="$1"
echo "$message" >&2
}
## Function: die MESSAGE
## Print message to stderr and exit the whole process
## Note:
## Using () makes the command inside them run in a sub-shell and calling a exit from there
## causes you to exit the sub-shell and not your original shell, hence execution continues in
## your original shell. To overcome this use { }
## ref: http://stackoverflow.com/questions/3822621/how-to-exit-if-a-command-failed
die() {
local message="$1"
warn "$message"
exit 1
}
docker_try_rmi() {
local image_name="$1"
## Note: inspect output has quotation characters, so sed to remove it as an argument
local image_id=$(docker inspect --format="{{json .Id}}" $image_name | sed -e 's/^"//' -e 's/"$//')
[ -z "$image_id" ] || {
## Remove all the exited containers from this image
docker ps -a -q -f "status=exited" -f "ancestor=$1" | xargs --no-run-if-empty docker rm
## Note: If there are running containers from this image, the build system is in an
## unexpected state. The 'rmi' will fail and we need investigate the build environment.
docker rmi $image_name
}
}
sonic_get_version() {
local describe=$(git describe --tags)
local latest_tag=$(git describe --tags --abbrev=0)
local branch_name=$(git rev-parse --abbrev-ref HEAD)
if [ -n "$(git status --untracked-files=no -s --ignore-submodules)" ]; then
local dirty="-dirty-$BUILD_TIMESTAMP"
fi
BUILD_NUMBER=${BUILD_NUMBER:-0}
## Check if we are on tagged commit
## Note: escape the version string by sed: / -> _
if [ -n "$latest_tag" ] && [ "$describe" == "$latest_tag" ]; then
echo "${latest_tag}${dirty}" | sed 's/\//_/g'
else
echo "${branch_name}.${BUILD_NUMBER}${dirty:--$(git rev-parse --short HEAD)}" | sed 's/\//_/g'
fi
}