Delay chdir(/) until we opened the main config

[exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 673cdf250fcfbc3df28164bad82b9f8530d83d85..c61d7a2e816f7235c3ffdd49d876f24729b010a8 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -3151,6 +3151,11 @@ using one of the words &%router_list%&, &%transport_list%&, or
 settings can be obtained by using &%routers%&, &%transports%&, or
 &%authenticators%&.
 
+.cindex "environment"
+If &%environment%& is given as an argument, the set of environment
+variables is output, line by line. Using the &%-n%& flag supresses the value of the
+variables.
+
 .cindex "options" "macro &-- extracting"
 If invoked by an admin user, then &%macro%&, &%macro_list%& and &%macros%&
 are available, similarly to the drivers.  Because macros are sometimes used
@@ -7739,7 +7744,7 @@ domain, host, address and local part lists.
 
 
 
-.section "Expansion of lists" "SECID75"
+.section "Expansion of lists" "SECTlistexpand"
 .cindex "expansion" "of lists"
 Each list is expanded as a single string before it is used. The result of
 expansion must be a list, possibly containing empty items, which is split up
@@ -13947,6 +13952,14 @@ received. See chapter &<<CHAPACL>>& for further details.
 This option defines the ACL that is run when an SMTP VRFY command is
 received. See chapter &<<CHAPACL>>& for further details.
 
+.new
+.option add_environment main "string list" empty
+.cindex "environment" "inherited"
+This option allows to set individual environment variables that the
+currently linked libraries and programs in child processes use. The
+default list is empty,
+.wen
+
 .option admin_groups main "string list&!!" unset
 .cindex "admin user"
 This option is expanded just once, at the start of Exim's processing. If the
@@ -15034,6 +15047,30 @@ process rather than a remote host, and is using &%-bs%& to inject the messages,
 .option ignore_fromline_local main boolean false
 See &%ignore_fromline_hosts%& above.
 
+.new
+.option keep_environment main "string list" unset
+.cindex "environment" "inherited"
+This option contains a string list of environment variables to keep.
+You have to trust these variables or you have to be sure that
+these variables do not impose any security risk. Keep in mind that
+during the startup phase Exim is running with an effective UID 0 in most
+installations. As the default value is an empty list, the default
+environment for using libraries, running embedded Perl code, or running
+external binaries is empty, and does not not even contain PATH or HOME.
+
+Actually the list is interpreted as a list of patterns
+(&<<SECTlistexpand>>&), except that it is not expanded first.
+
+WARNING: Macro substitution is still done first, so having a macro
+FOO and having FOO_HOME in your &%keep_environment%& option may have
+unexpected results. You may work around this using a regular expression
+that does not match the macro name: ^[F]OO_HOME$.
+
+Current versions of Exim issue a warning during startupif you do not mention
+&%keep_environment%& or &%add_environment%& in your runtime configuration
+file.
+.wen
+
 
 .option keep_malformed main time 4d
 This option specifies the length of time to keep messages whose spool files
@@ -16072,6 +16109,12 @@ it qualifies them only if the message came from a host that matches
 &%sender_unqualified_hosts%&, or if the message was submitted locally (not
 using TCP/IP), and the &%-bnq%& option was not set.
 
+.option set_environment main "string list" empty
+.cindex "environment"
+This option allows to set individual environment variables that the
+currently linked libraries and programs in child processes use. The
+default list is empty,
+
 
 .option slow_lookup_log main integer 0
 .cindex "logging" "slow lookups"