diff options
Diffstat (limited to 'guix/build/utils.scm')
| -rw-r--r-- | guix/build/utils.scm | 134 |
1 files changed, 73 insertions, 61 deletions
diff --git a/guix/build/utils.scm b/guix/build/utils.scm index 2988193fce..bc6f114152 100644 --- a/guix/build/utils.scm +++ b/guix/build/utils.scm @@ -1,5 +1,5 @@ ;;; GNU Guix --- Functional package management for GNU -;;; Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org> +;;; Copyright © 2012, 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org> ;;; Copyright © 2013 Andreas Enge <andreas@enge.fr> ;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org> ;;; Copyright © 2015 Mark H Weaver <mhw@netris.org> @@ -518,8 +518,8 @@ following forms: (add-before <old-phase-name> <new-phase-name> <new-phase>) (add-after <old-phase-name> <new-phase-name> <new-phase>) -Where every <*-phase-name> is an automatically quoted symbol, and <new-phase> -an expression evaluating to a procedure." +Where every <*-phase-name> is an expression evaluating to a symbol, and +<new-phase> an expression evaluating to a procedure." (let* ((phases* phases) (phases* (%modify-phases phases* mod-spec)) ...) @@ -944,64 +944,76 @@ This is useful for scripts that expect particular programs to be in $PATH, for programs that expect particular shared libraries to be in $LD_LIBRARY_PATH, or modules in $GUILE_LOAD_PATH, etc. -If PROG has previously been wrapped by wrap-program the wrapper will point to -the previous wrapper." - (define (wrapper-file-name number) - (format #f "~a/.~a-wrap-~2'0d" (dirname prog) (basename prog) number)) - (define (next-wrapper-number) - (let ((wrappers - (find-files (dirname prog) - (string-append "\\." (basename prog) "-wrap-.*")))) - (if (null? wrappers) - 0 - (string->number (string-take-right (last wrappers) 2))))) - (define (wrapper-target number) - (if (zero? number) - (let ((prog-real (string-append (dirname prog) "/." - (basename prog) "-real"))) - (rename-file prog prog-real) - prog-real) - (wrapper-file-name number))) - - (let* ((number (next-wrapper-number)) - (target (wrapper-target number)) - (wrapper (wrapper-file-name (1+ number))) - (prog-tmp (string-append target "-tmp"))) - (define (export-variable lst) - ;; Return a string that exports an environment variable. - (match lst - ((var sep '= rest) - (format #f "export ~a=\"~a\"" - var (string-join rest sep))) - ((var sep 'prefix rest) - (format #f "export ~a=\"~a${~a~a+~a}$~a\"" - var (string-join rest sep) var sep sep var)) - ((var sep 'suffix rest) - (format #f "export ~a=\"$~a${~a~a+~a}~a\"" - var var var sep sep (string-join rest sep))) - ((var '= rest) - (format #f "export ~a=\"~a\"" - var (string-join rest ":"))) - ((var 'prefix rest) - (format #f "export ~a=\"~a${~a:+:}$~a\"" - var (string-join rest ":") var var)) - ((var 'suffix rest) - (format #f "export ~a=\"$~a${~a:+:}~a\"" - var var var (string-join rest ":"))))) - - (with-output-to-file prog-tmp - (lambda () - (format #t - "#!~a~%~a~%exec -a \"$0\" \"~a\" \"$@\"~%" - (which "bash") - (string-join (map export-variable vars) - "\n") - (canonicalize-path target)))) - - (chmod prog-tmp #o755) - (rename-file prog-tmp wrapper) - (symlink wrapper prog-tmp) - (rename-file prog-tmp prog))) +If PROG has previously been wrapped by 'wrap-program', the wrapper is extended +with definitions for VARS." + (define wrapped-file + (string-append (dirname prog) "/." (basename prog) "-real")) + + (define already-wrapped? + (file-exists? wrapped-file)) + + (define (last-line port) + ;; Return the last line read from PORT and leave PORT's cursor right + ;; before it. + (let loop ((previous-line-offset 0) + (previous-line "") + (position (seek port 0 SEEK_CUR))) + (match (read-line port 'concat) + ((? eof-object?) + (seek port previous-line-offset SEEK_SET) + previous-line) + ((? string? line) + (loop position line (+ (string-length line) position)))))) + + (define (export-variable lst) + ;; Return a string that exports an environment variable. + (match lst + ((var sep '= rest) + (format #f "export ~a=\"~a\"" + var (string-join rest sep))) + ((var sep 'prefix rest) + (format #f "export ~a=\"~a${~a~a+~a}$~a\"" + var (string-join rest sep) var sep sep var)) + ((var sep 'suffix rest) + (format #f "export ~a=\"$~a${~a~a+~a}~a\"" + var var var sep sep (string-join rest sep))) + ((var '= rest) + (format #f "export ~a=\"~a\"" + var (string-join rest ":"))) + ((var 'prefix rest) + (format #f "export ~a=\"~a${~a:+:}$~a\"" + var (string-join rest ":") var var)) + ((var 'suffix rest) + (format #f "export ~a=\"$~a${~a:+:}~a\"" + var var var (string-join rest ":"))))) + + (if already-wrapped? + + ;; PROG is already a wrapper: add the new "export VAR=VALUE" lines just + ;; before the last line. + (let* ((port (open-file prog "r+")) + (last (last-line port))) + (for-each (lambda (var) + (display (export-variable var) port) + (newline port)) + vars) + (display last port) + (close-port port)) + + ;; PROG is not wrapped yet: create a shell script that sets VARS. + (let ((prog-tmp (string-append wrapped-file "-tmp"))) + (link prog wrapped-file) + + (call-with-output-file prog-tmp + (lambda (port) + (format port + "#!~a~%~a~%exec -a \"$0\" \"~a\" \"$@\"~%" + (which "bash") + (string-join (map export-variable vars) "\n") + (canonicalize-path wrapped-file)))) + + (chmod prog-tmp #o755) + (rename-file prog-tmp prog)))) ;;; |