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tools: Move bootloaders to libexec directory

PATCH Superseded George Dunlap 2 participants 8 messages May 15, 2012

v2 of 3 Superseded Latest is v3 →

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George Dunlap

author
#0 lore raw

PATCH v2 1/1 tools: Move bootloaders to libexec directory

tools: Move bootloaders to libexec directory

pygrub and xenpvnetboot are meant to be run by tools, and not by the user, and thus should be in /usr/lib/xen/bin rather than /usr/bin. This patch series:
* Causes libxl to look in the libexec dir if a full path is not specified, falling back to searching PATH if it's not in the libexec dir
* Moves pygrub and xenpvnetboot into the libexec dir
* For compatibility with existing configs, puts a link to pygrub in /usr/bin
* Warns the user that /usr/bin/pygrub is deprecated

v2:
- If the bootloader is not in the libexec path, revert to using the string as passed in the config file (which will search $PATH)
- Use strcmp rather than strncmp

author
#1 lore raw

PATCH v2 1/1 libxl: Look for bootloader in libexec path

If the full path for a bootloader (such as pygrub or xenpvnetboot) is not given, check for it first in the libexec path before falling back to the PATH variable.

v2:
- Check for the libexec path, and if the bootloader isn't there, fall back to the explicitly passed value. If the full path isn't specified, this will case execvp to search using the path given in the PATH variable.

Signed-off-by George Dunlap <[email protected]>
tools/libxl/libxl_bootloader.c +26 -1
diff -r 84ae90427c54 -r 662e2f6be283 tools/libxl/libxl_bootloader.c
@@ -333,6 +333,7 @@ int libxl_run_bootloader(libxl_ctx *ctx,
 
     char tempdir_template[] = "/var/run/libxl/bl.XXXXXX";
     char *tempdir;
+    const char *bootloader = NULL;
 
     char *dom_console_xs_path;
     char dom_console_slave_tty_path[PATH_MAX];

@@ -397,6 +398,30 @@ int libxl_run_bootloader(libxl_ctx *ctx,
         goto out_close;
     }
 
+    LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "Config bootloader path: %s",
+               info->u.pv.bootloader);
+
+    bootloader = libxl__abs_path(gc, info->u.pv.bootloader,
+                                 libxl__libexec_path());
+    if ( bootloader == NULL ) {
+        rc = ERROR_NOMEM;
+        goto out_close;
+    } else {
+        /* Check to see if the file exists in this location; if not,  fall back
+         * to checking the path */
+        struct stat st;
+
+        LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "Resulting bootloader path: %s",
+                   bootloader);
+
+        if ( lstat(bootloader, &st) )
+        {
+            LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "%s doesn't exist, will search $PATH",
+                       bootloader);
+            bootloader = info->u.pv.bootloader;
+        }
+    }
+
     /*
      * We need to present the bootloader's tty as a pty slave that xenconsole
      * can access.  Since the bootloader itself needs a pty slave,

@@ -417,7 +442,7 @@ int libxl_run_bootloader(libxl_ctx *ctx,
     dom_console_xs_path = libxl__sprintf(gc, "%s/console/tty", libxl__xs_get_dompath(gc, domid));
     libxl__xs_write(gc, XBT_NULL, dom_console_xs_path, "%s", dom_console_slave_tty_path);
 
-    pid = fork_exec_bootloader(&bootloader_fd, info->u.pv.bootloader, args);
+    pid = fork_exec_bootloader(&bootloader_fd, bootloader, args);
     if (pid < 0) {
         goto out_close;
     }
#2 lore raw

Re: [PATCH 1 of 3 v2] libxl: Look for bootloader in libexec path

Quoted 23 lines · George Dunlap

If the full path for a bootloader (such as pygrub or xenpvnetboot) is not given, check for it first in the libexec path before falling back to the PATH variable.

v2:
- Check for the libexec path, and if the bootloader isn't there, fall back to the explicitly passed value. If the full path isn't specified, this will case execvp to search using the path given in the PATH variable.

Signed-off-by George Dunlap <[email protected]>

diff -r 84ae90427c54 -r 662e2f6be283 tools/libxl/libxl_bootloader.c

tools/libxl/libxl_bootloader.c +1 -0
@@ -333,6 +333,7 @@ int libxl_run_bootloader(libxl_ctx *ctx,
 
     char tempdir_template[] = "/var/run/libxl/bl.XXXXXX";
     char *tempdir;
+    const char *bootloader = NULL;
 
     char *dom_console_xs_path;
     char dom_console_slave_tty_path[PATH_MAX];

tools/libxl/libxl_bootloader.c int libxl_run_bootloader(libxl_ctx *ctx, · line 406

Quoted 9 lines
tools/libxl/libxl_bootloader.c +6 -0
@@ -397,6 +398,30 @@ int libxl_run_bootloader(libxl_ctx *ctx,
         goto out_close;
     }
 
+    LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "Config bootloader path: %s",
+               info->u.pv.bootloader);
+
+    bootloader = libxl__abs_path(gc, info->u.pv.bootloader,
+                                 libxl__libexec_path());
+    if ( bootloader == NULL ) {

Since you seem to be respinning anyway...

This can't actually happen any more, since 25181:26f72d923cb9 (libxl:
Crash (more sensibly) on malloc failure)

Quoted 35 lines
tools/libxl/libxl_bootloader.c +19 -1
+        rc = ERROR_NOMEM;
+        goto out_close;
+    } else {
+        /* Check to see if the file exists in this location; if not,  fall back
+         * to checking the path */
+        struct stat st;
+
+        LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "Resulting bootloader path: %s",
+                   bootloader);
+
+        if ( lstat(bootloader, &st) )
+        {
+            LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "%s doesn't exist, will search $PATH",
+                       bootloader);
+            bootloader = info->u.pv.bootloader;
+        }
+    }
+
     /*
      * We need to present the bootloader's tty as a pty slave that xenconsole
      * can access.  Since the bootloader itself needs a pty slave,

@@ -417,7 +442,7 @@ int libxl_run_bootloader(libxl_ctx *ctx,
     dom_console_xs_path = libxl__sprintf(gc, "%s/console/tty", libxl__xs_get_dompath(gc, domid));
     libxl__xs_write(gc, XBT_NULL, dom_console_xs_path, "%s", dom_console_slave_tty_path);
 
-    pid = fork_exec_bootloader(&bootloader_fd, info->u.pv.bootloader, args);
+    pid = fork_exec_bootloader(&bootloader_fd, bootloader, args);
     if (pid < 0) {
         goto out_close;
     }

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author
#3 lore raw

PATCH v2 1/1 tools: Install pv bootloaders in libexec rather than /usr/bin

In reply to George Dunlap

pygrub and xenpvnetboot are meant to be run by tools, and not by the user, and thus should be in /usr/lib/xen/bin rather than /usr/bin.

Because most config files will still have an absolute path pointing to /usr/bin/pygrub, make a symbolic link that we will deprecate.

Signed-off-by George Dunlap <[email protected]>
tools/misc/Makefile +6 -1
diff -r 662e2f6be283 -r 4503705206f3 tools/misc/Makefile
@@ -18,7 +18,7 @@ SUBDIRS-$(CONFIG_LOMOUNT) += lomount
 SUBDIRS-$(CONFIG_MINITERM) += miniterm
 SUBDIRS := $(SUBDIRS-y)
 
-INSTALL_BIN-y := xencons xenpvnetboot
+INSTALL_BIN-y := xencons
 INSTALL_BIN-$(CONFIG_X86) += xen-detect
 INSTALL_BIN := $(INSTALL_BIN-y)
 

@@ -27,6 +27,9 @@ INSTALL_SBIN-$(CONFIG_X86) += xen-hvmctx
 INSTALL_SBIN-$(CONFIG_MIGRATE) += xen-hptool
 INSTALL_SBIN := $(INSTALL_SBIN-y)
 
+INSTALL_PRIVBIN-y := xenpvnetboot
+INSTALL_PRIVBIN := $(INSTALL_PRIVBIN-y)
+
 # Include configure output (config.h) to headers search path
 CFLAGS += -I$(XEN_ROOT)/tools
 

@@ -41,8 +44,10 @@ build: $(TARGETS)
 install: build
 	$(INSTALL_DIR) $(DESTDIR)$(BINDIR)
 	$(INSTALL_DIR) $(DESTDIR)$(SBINDIR)
+	$(INSTALL_DIR) $(DESTDIR)$(PRIVATE_BINDIR)
 	$(INSTALL_PYTHON_PROG) $(INSTALL_BIN) $(DESTDIR)$(BINDIR)
 	$(INSTALL_PYTHON_PROG) $(INSTALL_SBIN) $(DESTDIR)$(SBINDIR)
+	$(INSTALL_PYTHON_PROG) $(INSTALL_PRIVBIN) $(DESTDIR)$(PRIVATE_BINDIR)
 	set -e; for d in $(SUBDIRS); do $(MAKE) -C $$d install-recurse; done
 
 .PHONY: clean
tools/pygrub/Makefile +4 -2
diff -r 662e2f6be283 -r 4503705206f3 tools/pygrub/Makefile
@@ -11,9 +11,11 @@ build:
 .PHONY: install
 install: all
 	CC="$(CC)" CFLAGS="$(CFLAGS)" $(PYTHON) setup.py install \
-		$(PYTHON_PREFIX_ARG) --root="$(DESTDIR)" --force
-	$(INSTALL_PYTHON_PROG) src/pygrub $(DESTDIR)/$(BINDIR)/pygrub
+		$(PYTHON_PREFIX_ARG) --root="$(DESTDIR)" \
+		--install-scripts=$(DESTDIR)/$(PRIVATE_BINDIR) --force
+	$(INSTALL_PYTHON_PROG) src/pygrub $(DESTDIR)/$(PRIVATE_BINDIR)/pygrub
 	$(INSTALL_DIR) $(DESTDIR)/var/run/xend/boot
+	ln -sf $(PRIVATE_BINDIR)/pygrub $(DESTDIR)/$(BINDIR)
 
 .PHONY: clean
 clean:
Acked-by on v2 1/1
#4 lore raw

Re: [PATCH 2 of 3 v2] tools: Install pv bootloaders in libexec rather than /usr/bin

Quoted 7 lines · George Dunlap

pygrub and xenpvnetboot are meant to be run by tools, and not by the user, and thus should be in /usr/lib/xen/bin rather than /usr/bin.

Because most config files will still have an absolute path pointing to /usr/bin/pygrub, make a symbolic link that we will deprecate.

Signed-off-by George Dunlap <[email protected]>
Acked-by Ian Campbell <[email protected]>
Quoted 56 lines

diff -r 662e2f6be283 -r 4503705206f3 tools/misc/Makefile

tools/misc/Makefile +6 -1
@@ -18,7 +18,7 @@ SUBDIRS-$(CONFIG_LOMOUNT) += lomount
 SUBDIRS-$(CONFIG_MINITERM) += miniterm
 SUBDIRS := $(SUBDIRS-y)
 
-INSTALL_BIN-y := xencons xenpvnetboot
+INSTALL_BIN-y := xencons
 INSTALL_BIN-$(CONFIG_X86) += xen-detect
 INSTALL_BIN := $(INSTALL_BIN-y)
 

@@ -27,6 +27,9 @@ INSTALL_SBIN-$(CONFIG_X86) += xen-hvmctx
 INSTALL_SBIN-$(CONFIG_MIGRATE) += xen-hptool
 INSTALL_SBIN := $(INSTALL_SBIN-y)
 
+INSTALL_PRIVBIN-y := xenpvnetboot
+INSTALL_PRIVBIN := $(INSTALL_PRIVBIN-y)
+
 # Include configure output (config.h) to headers search path
 CFLAGS += -I$(XEN_ROOT)/tools
 

@@ -41,8 +44,10 @@ build: $(TARGETS)
 install: build
 	$(INSTALL_DIR) $(DESTDIR)$(BINDIR)
 	$(INSTALL_DIR) $(DESTDIR)$(SBINDIR)
+	$(INSTALL_DIR) $(DESTDIR)$(PRIVATE_BINDIR)
 	$(INSTALL_PYTHON_PROG) $(INSTALL_BIN) $(DESTDIR)$(BINDIR)
 	$(INSTALL_PYTHON_PROG) $(INSTALL_SBIN) $(DESTDIR)$(SBINDIR)
+	$(INSTALL_PYTHON_PROG) $(INSTALL_PRIVBIN) $(DESTDIR)$(PRIVATE_BINDIR)
 	set -e; for d in $(SUBDIRS); do $(MAKE) -C $$d install-recurse; done
 
 .PHONY: clean

diff -r 662e2f6be283 -r 4503705206f3 tools/pygrub/Makefile

tools/pygrub/Makefile +4 -2
@@ -11,9 +11,11 @@ build:
 .PHONY: install
 install: all
 	CC="$(CC)" CFLAGS="$(CFLAGS)" $(PYTHON) setup.py install \
-		$(PYTHON_PREFIX_ARG) --root="$(DESTDIR)" --force
-	$(INSTALL_PYTHON_PROG) src/pygrub $(DESTDIR)/$(BINDIR)/pygrub
+		$(PYTHON_PREFIX_ARG) --root="$(DESTDIR)" \
+		--install-scripts=$(DESTDIR)/$(PRIVATE_BINDIR) --force
+	$(INSTALL_PYTHON_PROG) src/pygrub $(DESTDIR)/$(PRIVATE_BINDIR)/pygrub
 	$(INSTALL_DIR) $(DESTDIR)/var/run/xend/boot
+	ln -sf $(PRIVATE_BINDIR)/pygrub $(DESTDIR)/$(BINDIR)
 
 .PHONY: clean
 clean:

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author
#5 lore raw

PATCH v2 1/1 libxl: Warn that /usr/bin/pygrub is deprecated

In reply to George Dunlap

v2: Use strcmp rather than strncmp.

Signed-off-by George Dunlap <[email protected]>
tools/libxl/libxl_bootloader.c +6 -0
diff -r 4503705206f3 -r 01804c550dd1 tools/libxl/libxl_bootloader.c
@@ -15,6 +15,7 @@
 #include "libxl_osdeps.h" /* must come before any other headers */
 
 #include <termios.h>
+#include <string.h>
 
 #include "libxl_internal.h"
 

@@ -401,6 +402,11 @@ int libxl_run_bootloader(libxl_ctx *ctx,
     LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "Config bootloader path: %s",
                info->u.pv.bootloader);
 
+    if ( !strcmp(info->u.pv.bootloader, "/usr/bin/pygrub") )
+        LIBXL__LOG(ctx, LIBXL__LOG_WARNING,
+                   "WARNING: bootloader='/usr/bin/pygrub' "             \
+                   "is deprecated; use bootloader='pygrub' instead");
+    
     bootloader = libxl__abs_path(gc, info->u.pv.bootloader,
                                  libxl__libexec_path());
     if ( bootloader == NULL ) {
Acked-by on v2 1/1
#6 lore raw

Re: [PATCH 3 of 3 v2] libxl: Warn that /usr/bin/pygrub is deprecated

Quoted 3 lines · George Dunlap

v2: Use strcmp rather than strncmp.

Signed-off-by George Dunlap <[email protected]>
Acked-by Ian Campbell <[email protected]>
Quoted 29 lines

diff -r 4503705206f3 -r 01804c550dd1 tools/libxl/libxl_bootloader.c

tools/libxl/libxl_bootloader.c +6 -0
@@ -15,6 +15,7 @@
 #include "libxl_osdeps.h" /* must come before any other headers */
 
 #include <termios.h>
+#include <string.h>
 
 #include "libxl_internal.h"
 

@@ -401,6 +402,11 @@ int libxl_run_bootloader(libxl_ctx *ctx,
     LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "Config bootloader path: %s",
                info->u.pv.bootloader);
 
+    if ( !strcmp(info->u.pv.bootloader, "/usr/bin/pygrub") )
+        LIBXL__LOG(ctx, LIBXL__LOG_WARNING,
+                   "WARNING: bootloader='/usr/bin/pygrub' "             \
+                   "is deprecated; use bootloader='pygrub' instead");
+    
     bootloader = libxl__abs_path(gc, info->u.pv.bootloader,
                                  libxl__libexec_path());
     if ( bootloader == NULL ) {

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author
#7 lore raw
In reply to George Dunlap

Hmm -- sorry, seems a bunch of changes have been made to libxl_bootloader.c. Let me take a look at this.

-Georg

Quoted 20 lines · George Dunlap

tools: Move bootloaders to libexec directory

pygrub and xenpvnetboot are meant to be run by tools, and not by the user, and thus should be in /usr/lib/xen/bin rather than /usr/bin.  This patch series:
* Causes libxl to look in the libexec dir if a full path is not specified, falling back to searching PATH if it's not in the libexec dir
* Moves pygrub and xenpvnetboot into the libexec dir
* For compatibility with existing configs, puts a link to pygrub in /usr/bin
* Warns the user that /usr/bin/pygrub is deprecated

v2:
 - If the bootloader is not in the libexec path, revert to using the string as passed in the config file (which will search $PATH)
 - Use strcmp rather than strncmp

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