147 lines
7.0 KiB
Markdown
147 lines
7.0 KiB
Markdown
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cmdarg
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======
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cmdarg is a helper library I wrote for bash scripts because, at current, option parsing in bash (-foo bar, etc) is really hard, lots harder than it should be, given bash's target audience. So here's my solution. There are 4 functions you will care about:
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cmdarg
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cmdarg_info
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cmdarg_parse
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cmdarg_usage
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cmdarg
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======
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This function is used to tell the library what command line arguments you accept. Check cmdarg.sh for the latest syntax.
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cmdarg 'l:' 'source_ldap' 'Source (old) LDAP URI'
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cmdarg 'u:' 'source_ldap_username' 'Source (old) LDAP Username'
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cmdarg 'c:' 'groupmap' 'A CSV file mapping usernames to groups that they should belong to post-conversion' '' 'test -e $OPTARG'
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All arguments are OPTIONAL by default. An argument that has ':' on the end of its single character option, and does not specify a default value (empty string is considered "not specified"), is REQUIRED.
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cmdarg_info
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===========
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This function sets up information about your program for use when printing the help/usage message. Again, see cmdarg.sh for the latest syntax.
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cmdarg_info "header" "Convert existing LDAP users to the new LDAP server/schema."
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cmdarg_info "author" "Some Poor Bastard <somepoorbastard@hell.com>"
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cmdarg_info "copyright" "(C) 2013"
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cmdarg_parse
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============
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This command does what you expect, parsing your command line arguments. However you must pass your command line arguments to it. Generally this means:
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cmdarg_parse "$@"
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... Beware that "$@" will change depending on your context. So if you have a main() function called in your script, you need to make sure that you pass "$@" from the toplevel script in to it, otherwise the options will be blank when you pass them to cmdarg_parse.
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Any argument parsed that has a validator assigned, and whose validator returns nonzero, is considered a failure. Any REQUIRED argument that is not specified is considered a failure.
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For every argument, a global associative array "cmdarg_cfg" is populated with the long version of the option. E.g., in the example above, '-c' would become ${cmdarg_cfg['groupmap']}, for friendlier access during scripting.
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I love it when a plan comes together
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====================================
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Given some code like this:
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cmdarg_info "header" "Convert existing old LDAP users to the new LDAP server/schema."
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cmdarg_info "author" "Some Poor Bastard <somepoorbastard@hell.com>"
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cmdarg_info "copyright" "(C) 2013"
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cmdarg 'C:' 'cfgfile' 'Config file that contains options that should be used in place of command line args' '' 'test -e $OPTARG'
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cmdarg 'c:' 'groupmap' 'A CSV file mapping usernames to groups that they should belong to post-conversion' '' 'test -e $OPTARG'
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cmdarg 'l:' 'source_ldap' 'Source (old) LDAP URI'
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cmdarg 'u:' 'source_ldap_username' 'Source (old) LDAP Username'
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cmdarg 'p:' 'source_ldap_password' 'Source (old) LDAP Password'
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cmdarg 'b:' 'source_ldap_basedn' 'Source (old) LDAP Base DN (ou=x,dc=x,dc=x)'
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cmdarg 'o:' 'source_ldap_ou_users' 'Source (old) LDAP ou for Users' 'users'
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cmdarg 'g:' 'source_ldap_ou_groups' 'Source (old) LDAP ou for Groups' 'groups'
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cmdarg 'L:' 'dest_ldap' 'Destination (new) LDAP URI'
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cmdarg 'U:' 'dest_ldap_username' 'Destination (new) LDAP Username'
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cmdarg 'P:' 'dest_ldap_password' 'Destination (new) LDAP Password'
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cmdarg 'B:' 'dest_ldap_basedn' 'Destination (new) LDAP Base DN (dc=x,dc=x)'
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cmdarg 'O:' 'source_ldap_ou_users' 'Destination (new) LDAP ou for Users' 'users'
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cmdarg 'G:' 'source_ldap_ou_groups' 'Destination (new) LDAP ou for Groups' 'groups'
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cmdarg 's:' 'slappasswd_salt' 'Slappasswd salt format (man slappasswd)' 'rofflewaffles%s'
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cmdarg 'S:' 'slappasswd_scheme' 'Slappasswwd hash scheme to use (CRYPT|MD5|SMD5|SSHA|SHA)' 'SSHA' 'echo $OPTARG | grep -E "CRYPT|MD5|SMD5|SSHA|SHA" >/dev/null 2>&1'
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cmdarg_parse "$@"
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... Here's what we can expect to see from the usage message:
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$ ./ldap-convert.sh -h
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ldap-convert.sh (C) 2013 : Some Poor Bastard <somepoorbastard@hell.com>
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Convert existing LDAP users to the new LDAP server/schema.
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Required Arguments:
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-C : Config file that contains options that should be used in place of command line args
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-c : A CSV file mapping usernames to groups that they should belong to post-conversion
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-l : Source (old) LDAP URI
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-u : Source (old) LDAP Username
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-p : Source (old) LDAP Password
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-b : Source (old) LDAP Base DN (ou=x,dc=x,dc=x)
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-L : Destination (new) LDAP URI
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-U : Destination (new) LDAP Username
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-P : Destination (new) LDAP Password
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-B : Destination (new) LDAP Base DN (dc=x,dc=x)
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Optional Arguments:
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-o : Source (old) LDAP ou for Users (Default "users")
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-g : Source (old) LDAP ou for Groups (Default "groups")
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-O : Destination (new) LDAP ou for Users (Default "users")
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-G : Destination (new) LDAP ou for Groups (Default "groups")
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-s : Slappasswd salt format (man slappasswd) (Default "rofflewaffles%s")
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-S : Slappasswwd hash scheme to use (CRYPT|MD5|SMD5|SSHA|SHA) (Default "SSHA")
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... And if we run it without '-h', then the argument parser (rather helpfully) tells us which arguments we've failed to specify, before printing the help:
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$ ./ldap-convert.sh
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Invalid value for -c :
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Invalid value for -C :
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Missing arguments : -C -c -l -u -p -b -L -U -P -B
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ldap-convert.sh (C) 2013 : Some Poor Bastard <somepoorbastard@hell.com>
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Convert existing LDAP users to the new LDAP server/schema.
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Required Arguments:
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-C : Config file that contains options that should be used in place of command line args
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-c : A CSV file mapping usernames to groups that they should belong to post-conversion
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-l : Source (old) LDAP URI
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-u : Source (old) LDAP Username
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-p : Source (old) LDAP Password
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-b : Source (old) LDAP Base DN (ou=x,dc=x,dc=x)
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-L : Destination (new) LDAP URI
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-U : Destination (new) LDAP Username
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-P : Destination (new) LDAP Password
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-B : Destination (new) LDAP Base DN (dc=x,dc=x)
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Optional Arguments:
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-o : Source (old) LDAP ou for Users (Default "users")
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-g : Source (old) LDAP ou for Groups (Default "groups")
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-O : Destination (new) LDAP ou for Users (Default "users")
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-G : Destination (new) LDAP ou for Groups (Default "groups")
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-s : Slappasswd salt format (man slappasswd) (Default "rofflewaffles%s")
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-S : Slappasswwd hash scheme to use (CRYPT|MD5|SMD5|SSHA|SHA) (Default "SSHA")
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... And here's what the cmdarg_cfg associate array winds up holding, illustrated with some debug prints:
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$ ./ldap-convert.sh -c ./users_groups_map.csv -l 1 -u 1 -p 1 -b 1 -L 1 -U 1 -P 1 -B 1
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cmdarg_cfg[groupmap]="./users_groups_map.csv"
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cmdarg_cfg[slappasswd_salt]="rofflewaffles%s"
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cmdarg_cfg[source_ldap_ou_groups]="groups"
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cmdarg_cfg[slappasswd_scheme]="SSHA"
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cmdarg_cfg[dest_ldap_username]="1"
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cmdarg_cfg[dest_ldap_password]="1"
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cmdarg_cfg[source_ldap_password]="1"
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cmdarg_cfg[source_ldap_username]="1"
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cmdarg_cfg[cfgfile]="/dev/null"
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cmdarg_cfg[dest_ldap_basedn]="1"
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cmdarg_cfg[source_ldap_basedn]="1"
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cmdarg_cfg[source_ldap_ou_users]="users"
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cmdarg_cfg[source_ldap]="1"
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cmdarg_cfg[dest_ldap]="1"
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