CODEWITHSUNDEEP
makefileinstallation
DanielGibbs
DanielGibbs

Reputation: 10173

Performing checks in a makefile

I have a makefile with an install target which creates a bunch of directories and installs some files. I would also like to check for the existence of a group and if it doesn't exist, create it. To do this I need to make sure the user is running as root. Is there a preferred way to do this in a makefile?

install: afile
    # Check user is root, otherwise print error and exit.
    # Check if "auser" exists, otherwise create it.
    # Check if "agroup" exists, otherwise create it.
    install -d -o auser -g agroup -m 0755 /path/to/stuff
    install -o auser -g agroup -m 0644 afile /path/to/stuff/afile
    service start aservice

Upvotes: 0

Views: 134

Answers (1)

MadScientist
MadScientist

Reputation: 100781

I don't see what this has to do with make, really, but I like to use the id command for doing these types of checks:

[ `id -u` = 0 ] || { echo "Not running as root"; exit 1; }
id "auser" 2>/dev/null || { echo "No user 'auser'"; exit 1; }

Checking groups is trickier; I'm actually not sure of a program that will do it. Of course, you can always just check /etc/group directly:

grep -q "^agroup:" /etc/groups || { echo "No group 'agroup'"; exit 1; }

Upvotes: 1

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