From: Michael Orlitzky <michael@orlitzky.com>
Date: Mon, 7 Aug 2017 21:50:35 +0000 (-0400)
Subject: sys-user.eclass: add and utilize a sys-user_getname() function.
X-Git-Url: http://gitweb.michael.orlitzky.com/?p=mjo-overlay.git;a=commitdiff_plain;h=07170b53c083ebec0c95f9e1f0ede6681fc60277

sys-user.eclass: add and utilize a sys-user_getname() function.
---

diff --git a/eclass/sys-user.eclass b/eclass/sys-user.eclass
index 9042f06..090a5ad 100644
--- a/eclass/sys-user.eclass
+++ b/eclass/sys-user.eclass
@@ -77,13 +77,19 @@ sys-user_src_compile() { :; }
 sys-user_src_test() { :; }
 
 sys-user_getuid() {
-	[[ $# -eq 1 ]] || die "usage: sys-user_getuid <username>"
-
 	# Output the real UID of the given user, or the empty string if the
 	# user does not exist on the system.
+	[[ $# -eq 1 ]] || die "usage: sys-user_getuid <username>"
 	echo $(id --real --user "${1}")
 }
 
+sys-user_getname() {
+	# Output the username associated with the given UID, or the empty string
+	# if the given UID is still available.
+	[[ $# -eq 1 ]] || die "usage: sys-user_getname <uid>"
+	echo $(egetent passwd "${1}" | cut -f1 -d':')
+}
+
 sys-user_create() {
 	# Create the user whose information is contained in the following
 	# variables:
@@ -136,7 +142,7 @@ sys-user_pkg_pretend() {
 	if [[ "${SYS_USER_UID_IMPORTANT}" == "true" ]]; then
 		# Ok, the UID is important. Make sure nobody else has it. Or
 		# rather, nobody else *with a different username* has it.
-		local oldname=$(egetent passwd "${SYS_USER_UID}" | cut -f1 -d':')
+		local oldname=$(sys-user_getname "${SYS_USER_UID}")
 		if [[ "${SYS_USER_NAME}" != "${oldname}" ]]; then
 			die "important UID ${SYS_USER_UID} already belongs to ${oldname}"
 		fi
@@ -178,8 +184,16 @@ sys-user_src_configure() {
 		fi
 	fi
 
-	# TODO: if the requested (unimportant) UID is not available, we
-	# should set SYS_USER_UID to the empty string.
+	if [[ -n "${SYS_USER_UID}" ]]; then
+		# A specific UID was requested.
+		local current_name=$(sys-user_getname "${SYS_USER_UID}")
+		if [[ "${current_name}" != "${SYS_USER_NAME}" ]]; then
+			# This UID is already taken by another user, but this
+			# specific UID was not important (we checked in
+			# pkg_pretend), so fall back to an arbitrary one.
+			SYS_USER_UID=""
+		fi
+	fi
 
 	# The "useradd" and "usermod" tools expect a comma-separated list,
 	# so change our spaces to commas. Having duplicates in the list is