forked from pool/grub2
76 lines
2.3 KiB
Diff
76 lines
2.3 KiB
Diff
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From: Andrey Borzenkov <arvidjaar@gmail.com>
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To: grub-devel@gnu.org
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Subject: [PATCH] fix parsing of LVM PV names for short names
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Default format of vgs output is
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- two spaces as standard prefix
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- PV name left aligned to field width which is 10 characters
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This means that if PV name has less than 10 chacaters it has some spaces at
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the end.
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Example:
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linux-chxo:~ # vgs -o pv_name --noheadings | cat -E
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/dev/md1 $
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/dev/md101$
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linux-chxo:~ #
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There is no explicit option to turn off alignment; it is implicitly
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disabled if one of --separator or --nameprefixes option is used.
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--separator was added in 2007, --nameprefixes - in 2009. So let's use
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--separator to extend range of versions we are compatible with. Note that
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one or another must be used, current parsing is broken otherwise.
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Signed-off-by: Andrey Borzenkov <arvidjaar@gmail.com>
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---
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util/getroot.c | 12 +++++++++---
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1 file changed, 9 insertions(+), 3 deletions(-)
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diff --git a/util/getroot.c b/util/getroot.c
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index 2ad8a55..3afcf96 100644
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--- a/util/getroot.c
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+++ b/util/getroot.c
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@@ -1322,7 +1322,7 @@ grub_util_get_dev_abstraction (const char *os_dev)
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static void
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pull_lvm_by_command (const char *os_dev)
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{
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- char *argv[6];
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+ char *argv[8];
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int fd;
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pid_t pid;
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FILE *mdadm;
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@@ -1351,12 +1351,17 @@ pull_lvm_by_command (const char *os_dev)
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/* execvp has inconvenient types, hence the casts. None of these
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strings will actually be modified. */
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+ /* by default PV name is left aligned in 10 character field, meaning that
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+ we do not know where name ends. Using dummy --separator disables
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+ alignment. We have a single field, so separator itself is not output */
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argv[0] = (char *) "vgs";
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argv[1] = (char *) "--options";
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argv[2] = (char *) "pv_name";
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argv[3] = (char *) "--noheadings";
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- argv[4] = vgname;
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- argv[5] = NULL;
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+ argv[4] = (char *) "--separator";
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+ argv[5] = (char *) ":";
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+ argv[6] = vgname;
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+ argv[7] = NULL;
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pid = exec_pipe (argv, &fd);
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free (vgname);
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@@ -1376,6 +1381,7 @@ pull_lvm_by_command (const char *os_dev)
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while (getline (&buf, &len, mdadm) > 0)
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{
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char *ptr;
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+ /* LVM adds two spaces as standard prefix */
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for (ptr = buf; ptr < buf + 2 && *ptr == ' '; ptr++);
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if (*ptr == '\0')
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continue;
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--
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tg: (ebd40b6..) u/strip-pv-trailing-blanks (depends on: master)
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